Merge pull request #81 from chrislusf/master

sync

157 files changed, 6868 insertions, 3006 deletions

diff --git a/weed/Makefile b/weed/Makefile
index 205104969..94faa11f2 100644
--- a/weed/Makefile
+++ b/weed/Makefile
@@ -38,9 +38,13 @@ debug_filer_copy:
 	go build -gcflags="all=-N -l"
 	dlv --listen=:2345 --headless=true --api-version=2 --accept-multiclient exec weed -- -v=4 filer.backup -filer=localhost:8888 -filerProxy -timeAgo=10h
 
-debug_filer_remote_sync:
+debug_filer_remote_sync_dir:
 	go build -gcflags="all=-N -l"
-	dlv --listen=:2345 --headless=true --api-version=2 --accept-multiclient exec weed -- -v=4 filer.remote.sync -filer="localhost:8888" -dir=/buckets/b2 -timeAgo=10000h
+	dlv --listen=:2345 --headless=true --api-version=2 --accept-multiclient exec weed -- -v=4 filer.remote.sync -filer="localhost:8888" -dir=/buckets/b2 -timeAgo=1h
+
+debug_filer_remote_sync_buckets:
+	go build -gcflags="all=-N -l"
+	dlv --listen=:2345 --headless=true --api-version=2 --accept-multiclient exec weed -- -v=4 filer.remote.sync -filer="localhost:8888" -createBucketAt=cloud1 -timeAgo=1h
 
 debug_master_follower:
 	go build -gcflags="all=-N -l"
diff --git a/weed/command/filer.go b/weed/command/filer.go
index ddee0852c..9a27978be 100644
--- a/weed/command/filer.go
+++ b/weed/command/filer.go
@@ -4,7 +4,6 @@ import (
 	"fmt"
 	"net/http"
 	"os"
-	"strconv"
 	"strings"
 	"time"
 
@@ -134,7 +133,7 @@ func runFiler(cmd *Command, args []string) bool {
 
 	go stats_collect.StartMetricsServer(*f.metricsHttpPort)
 
-	filerAddress := fmt.Sprintf("%s:%d", *f.ip, *f.port)
+	filerAddress := util.JoinHostPort(*f.ip, *f.port)
 	startDelay := time.Duration(2)
 	if *filerStartS3 {
 		filerS3Options.filer = &filerAddress
@@ -207,7 +206,7 @@ func (fo *FilerOptions) startFiler() {
 	}
 
 	if *fo.publicPort != 0 {
-		publicListeningAddress := *fo.bindIp + ":" + strconv.Itoa(*fo.publicPort)
+		publicListeningAddress := util.JoinHostPort(*fo.bindIp, *fo.publicPort)
 		glog.V(0).Infoln("Start Seaweed filer server", util.Version(), "public at", publicListeningAddress)
 		publicListener, e := util.NewListener(publicListeningAddress, 0)
 		if e != nil {
@@ -222,7 +221,7 @@ func (fo *FilerOptions) startFiler() {
 
 	glog.V(0).Infof("Start Seaweed Filer %s at %s:%d", util.Version(), *fo.ip, *fo.port)
 	filerListener, e := util.NewListener(
-		*fo.bindIp+":"+strconv.Itoa(*fo.port),
+		util.JoinHostPort(*fo.bindIp, *fo.port),
 		time.Duration(10)*time.Second,
 	)
 	if e != nil {
@@ -231,7 +230,7 @@ func (fo *FilerOptions) startFiler() {
 
 	// starting grpc server
 	grpcPort := *fo.port + 10000
-	grpcL, err := util.NewListener(*fo.bindIp+":"+strconv.Itoa(grpcPort), 0)
+	grpcL, err := util.NewListener(util.JoinHostPort(*fo.bindIp, grpcPort), 0)
 	if err != nil {
 		glog.Fatalf("failed to listen on grpc port %d: %v", grpcPort, err)
 	}
diff --git a/weed/command/filer_backup.go b/weed/command/filer_backup.go
index 0c450181b..5b6409187 100644
--- a/weed/command/filer_backup.go
+++ b/weed/command/filer_backup.go
@@ -113,6 +113,6 @@ func doFilerBackup(grpcDialOption grpc.DialOption, backupOption *FilerBackupOpti
 	})
 
 	return pb.FollowMetadata(sourceFiler, grpcDialOption, "backup_"+dataSink.GetName(),
-		sourcePath, startFrom.UnixNano(), 0, processEventFnWithOffset, false)
+		sourcePath, nil, startFrom.UnixNano(), 0, processEventFnWithOffset, false)
 
 }
diff --git a/weed/command/filer_cat.go b/weed/command/filer_cat.go
index a46098b04..09f5e97fe 100644
--- a/weed/command/filer_cat.go
+++ b/weed/command/filer_cat.go
@@ -108,6 +108,11 @@ func runFilerCat(cmd *Command, args []string) bool {
 			return err
 		}
 
+		if len(respLookupEntry.Entry.Content) > 0 {
+			_, err = writer.Write(respLookupEntry.Entry.Content)
+			return err
+		}
+
 		filerCat.filerClient = client
 
 		return filer.StreamContent(&filerCat, writer, respLookupEntry.Entry.Chunks, 0, math.MaxInt64)
diff --git a/weed/command/filer_copy.go b/weed/command/filer_copy.go
index 722f64679..05aa96292 100644
--- a/weed/command/filer_copy.go
+++ b/weed/command/filer_copy.go
@@ -115,7 +115,7 @@ func runCopy(cmd *Command, args []string) bool {
 	}
 
 	filerGrpcPort := filerPort + 10000
-	filerGrpcAddress := fmt.Sprintf("%s:%d", filerUrl.Hostname(), filerGrpcPort)
+	filerGrpcAddress := util.JoinHostPort(filerUrl.Hostname(), int(filerGrpcPort))
 	copy.grpcDialOption = security.LoadClientTLS(util.GetViper(), "grpc.client")
 
 	masters, collection, replication, dirBuckets, maxMB, cipher, err := readFilerConfiguration(copy.grpcDialOption, filerGrpcAddress)
@@ -392,8 +392,16 @@ func (worker *FileCopyWorker) uploadFileAsOne(task FileCopyTask, f *os.File) err
 		}
 
 		targetUrl := "http://" + assignResult.Url + "/" + assignResult.FileId
-
-		uploadResult, err := operation.UploadData(targetUrl, fileName, worker.options.cipher, data, false, mimeType, nil, security.EncodedJwt(assignResult.Auth))
+		uploadOption := &operation.UploadOption{
+			UploadUrl:         targetUrl,
+			Filename:          fileName,
+			Cipher:            worker.options.cipher,
+			IsInputCompressed: false,
+			MimeType:          mimeType,
+			PairMap:           nil,
+			Jwt:               security.EncodedJwt(assignResult.Auth),
+		}
+		uploadResult, err := operation.UploadData(data, uploadOption)
 		if err != nil {
 			return fmt.Errorf("upload data %v to %s: %v\n", fileName, targetUrl, err)
 		}
@@ -498,7 +506,16 @@ func (worker *FileCopyWorker) uploadFileInChunks(task FileCopyTask, f *os.File,
 				replication = assignResult.Replication
 			}
 
-			uploadResult, err, _ := operation.Upload(targetUrl, fileName+"-"+strconv.FormatInt(i+1, 10), worker.options.cipher, io.NewSectionReader(f, i*chunkSize, chunkSize), false, "", nil, security.EncodedJwt(assignResult.Auth))
+			uploadOption := &operation.UploadOption{
+				UploadUrl:         targetUrl,
+				Filename:          fileName+"-"+strconv.FormatInt(i+1, 10),
+				Cipher:            worker.options.cipher,
+				IsInputCompressed: false,
+				MimeType:          "",
+				PairMap:           nil,
+				Jwt:               security.EncodedJwt(assignResult.Auth),
+			}
+			uploadResult, err, _ := operation.Upload(io.NewSectionReader(f, i*chunkSize, chunkSize), uploadOption)
 			if err != nil {
 				uploadError = fmt.Errorf("upload data %v to %s: %v\n", fileName, targetUrl, err)
 				return
@@ -531,6 +548,11 @@ func (worker *FileCopyWorker) uploadFileInChunks(task FileCopyTask, f *os.File,
 		return uploadError
 	}
 
+	manifestedChunks, manifestErr := filer.MaybeManifestize(worker.saveDataAsChunk, chunks)
+	if manifestErr != nil {
+		return fmt.Errorf("create manifest: %v", manifestErr)
+	}
+
 	if err := pb.WithGrpcFilerClient(worker.filerGrpcAddress, worker.options.grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
 		request := &filer_pb.CreateEntryRequest{
 			Directory: task.destinationUrlPath,
@@ -548,7 +570,7 @@ func (worker *FileCopyWorker) uploadFileInChunks(task FileCopyTask, f *os.File,
 					Collection:  collection,
 					TtlSec:      worker.options.ttlSec,
 				},
-				Chunks: chunks,
+				Chunks: manifestedChunks,
 			},
 		}
 
@@ -583,3 +605,63 @@ func detectMimeType(f *os.File) string {
 	}
 	return mimeType
 }
+
+func (worker *FileCopyWorker) saveDataAsChunk(reader io.Reader, name string, offset int64) (chunk *filer_pb.FileChunk, collection, replication string, err error) {
+
+	var fileId, host string
+	var auth security.EncodedJwt
+
+	if flushErr := pb.WithGrpcFilerClient(worker.filerGrpcAddress, worker.options.grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
+
+		ctx := context.Background()
+
+		assignErr := util.Retry("assignVolume", func() error {
+			request := &filer_pb.AssignVolumeRequest{
+				Count:       1,
+				Replication: *worker.options.replication,
+				Collection:  *worker.options.collection,
+				TtlSec:      worker.options.ttlSec,
+				DiskType:    *worker.options.diskType,
+				Path:        name,
+			}
+
+			resp, err := client.AssignVolume(ctx, request)
+			if err != nil {
+				return fmt.Errorf("assign volume failure %v: %v", request, err)
+			}
+			if resp.Error != "" {
+				return fmt.Errorf("assign volume failure %v: %v", request, resp.Error)
+			}
+
+			fileId, host, auth = resp.FileId, resp.Url, security.EncodedJwt(resp.Auth)
+			collection, replication = resp.Collection, resp.Replication
+
+			return nil
+		})
+		if assignErr != nil {
+			return assignErr
+		}
+
+		return nil
+	}); flushErr != nil {
+		return nil, collection, replication, fmt.Errorf("filerGrpcAddress assign volume: %v", flushErr)
+	}
+
+	uploadOption := &operation.UploadOption{
+		UploadUrl:         fmt.Sprintf("http://%s/%s", host, fileId),
+		Filename:          name,
+		Cipher:            worker.options.cipher,
+		IsInputCompressed: false,
+		MimeType:          "",
+		PairMap:           nil,
+		Jwt:               auth,
+	}
+	uploadResult, flushErr, _ := operation.Upload(reader, uploadOption)
+	if flushErr != nil {
+		return nil, collection, replication, fmt.Errorf("upload data: %v", flushErr)
+	}
+	if uploadResult.Error != "" {
+		return nil, collection, replication, fmt.Errorf("upload result: %v", uploadResult.Error)
+	}
+	return uploadResult.ToPbFileChunk(fileId, offset), collection, replication, nil
+}
diff --git a/weed/command/filer_meta_backup.go b/weed/command/filer_meta_backup.go
index 6fe323fba..3757f63f1 100644
--- a/weed/command/filer_meta_backup.go
+++ b/weed/command/filer_meta_backup.go
@@ -196,7 +196,7 @@ func (metaBackup *FilerMetaBackupOptions) streamMetadataBackup() error {
 	})
 
 	return pb.FollowMetadata(*metaBackup.filerAddress, metaBackup.grpcDialOption, "meta_backup",
-		*metaBackup.filerDirectory, startTime.UnixNano(), 0, processEventFnWithOffset, false)
+		*metaBackup.filerDirectory, nil, startTime.UnixNano(), 0, processEventFnWithOffset, false)
 
 }
 
diff --git a/weed/command/filer_meta_tail.go b/weed/command/filer_meta_tail.go
index 28c0db99b..0363ae8d1 100644
--- a/weed/command/filer_meta_tail.go
+++ b/weed/command/filer_meta_tail.go
@@ -104,7 +104,7 @@ func runFilerMetaTail(cmd *Command, args []string) bool {
 	}
 
 	tailErr := pb.FollowMetadata(*tailFiler, grpcDialOption, "tail",
-		*tailTarget, time.Now().Add(-*tailStart).UnixNano(), 0,
+		*tailTarget, nil, time.Now().Add(-*tailStart).UnixNano(), 0,
 		func(resp *filer_pb.SubscribeMetadataResponse) error {
 			if !shouldPrint(resp) {
 				return nil
diff --git a/weed/command/filer_remote_sync.go b/weed/command/filer_remote_sync.go
index 8b20957e4..3776ee4d9 100644
--- a/weed/command/filer_remote_sync.go
+++ b/weed/command/filer_remote_sync.go
@@ -3,32 +3,33 @@ package command
 import (
 	"context"
 	"fmt"
-	"github.com/chrislusf/seaweedfs/weed/filer"
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/pb"
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
-	"github.com/chrislusf/seaweedfs/weed/remote_storage"
+	"github.com/chrislusf/seaweedfs/weed/pb/remote_pb"
 	"github.com/chrislusf/seaweedfs/weed/replication/source"
 	"github.com/chrislusf/seaweedfs/weed/security"
 	"github.com/chrislusf/seaweedfs/weed/util"
-	"github.com/golang/protobuf/proto"
 	"google.golang.org/grpc"
+	"os"
 	"time"
 )
 
 type RemoteSyncOptions struct {
-	filerAddress       *string
-	grpcDialOption     grpc.DialOption
-	readChunkFromFiler *bool
-	debug              *bool
-	timeAgo            *time.Duration
-	dir                *string
+	filerAddress             *string
+	grpcDialOption           grpc.DialOption
+	readChunkFromFiler       *bool
+	debug                    *bool
+	timeAgo                  *time.Duration
+	dir                      *string
+	createBucketAt           *string
+	createBucketRandomSuffix *bool
+
+	mappings    *remote_pb.RemoteStorageMapping
+	remoteConfs map[string]*remote_pb.RemoteConf
+	bucketsDir  string
 }
 
-const (
-	RemoteSyncKeyPrefix = "remote.sync."
-)
-
 var _ = filer_pb.FilerClient(&RemoteSyncOptions{})
 
 func (option *RemoteSyncOptions) WithFilerClient(fn func(filer_pb.SeaweedFilerClient) error) error {
@@ -47,20 +48,38 @@ var (
 func init() {
 	cmdFilerRemoteSynchronize.Run = runFilerRemoteSynchronize // break init cycle
 	remoteSyncOptions.filerAddress = cmdFilerRemoteSynchronize.Flag.String("filer", "localhost:8888", "filer of the SeaweedFS cluster")
-	remoteSyncOptions.dir = cmdFilerRemoteSynchronize.Flag.String("dir", "/", "a mounted directory on filer")
+	remoteSyncOptions.dir = cmdFilerRemoteSynchronize.Flag.String("dir", "", "a mounted directory on filer")
+	remoteSyncOptions.createBucketAt = cmdFilerRemoteSynchronize.Flag.String("createBucketAt", "", "one remote storage name to create new buckets in")
+	remoteSyncOptions.createBucketRandomSuffix = cmdFilerRemoteSynchronize.Flag.Bool("createBucketWithRandomSuffix", true, "add randomized suffix to bucket name to avoid conflicts")
 	remoteSyncOptions.readChunkFromFiler = cmdFilerRemoteSynchronize.Flag.Bool("filerProxy", false, "read file chunks from filer instead of volume servers")
 	remoteSyncOptions.debug = cmdFilerRemoteSynchronize.Flag.Bool("debug", false, "debug mode to print out filer updated remote files")
 	remoteSyncOptions.timeAgo = cmdFilerRemoteSynchronize.Flag.Duration("timeAgo", 0, "start time before now. \"300ms\", \"1.5h\" or \"2h45m\". Valid time units are \"ns\", \"us\" (or \"µs\"), \"ms\", \"s\", \"m\", \"h\"")
 }
 
 var cmdFilerRemoteSynchronize = &Command{
-	UsageLine: "filer.remote.sync -filer=<filerHost>:<filerPort> -dir=/mount/s3_on_cloud",
-	Short:     "resumable continuously write back updates to remote storage if the directory is mounted to the remote storage",
-	Long: `resumable continuously write back updates to remote storage if the directory is mounted to the remote storage
+	UsageLine: "filer.remote.sync",
+	Short:     "resumable continuously write back updates to remote storage",
+	Long: `resumable continuously write back updates to remote storage
 
 	filer.remote.sync listens on filer update events. 
 	If any mounted remote file is updated, it will fetch the updated content,
 	and write to the remote storage.
+
+	There are two modes:
+
+	1)By default, watch /buckets folder and write back all changes.
+
+		# if there is only one remote storage configured
+		weed filer.remote.sync
+		# if there are multiple remote storages configured
+		# specify a remote storage to create new buckets.
+		weed filer.remote.sync -createBucketAt=cloud1
+
+	2)Write back one mounted folder to remote storage
+
+		weed filer.remote.sync -dir=/mount/s3_on_cloud
+
+
 `,
 }
 
@@ -70,188 +89,57 @@ func runFilerRemoteSynchronize(cmd *Command, args []string) bool {
 	grpcDialOption := security.LoadClientTLS(util.GetViper(), "grpc.client")
 	remoteSyncOptions.grpcDialOption = grpcDialOption
 
-	// read filer remote storage mount mappings
-	mappings, readErr := filer.ReadMountMappings(grpcDialOption, *remoteSyncOptions.filerAddress)
-	if readErr != nil {
-		fmt.Printf("read mount mapping: %v", readErr)
-		return false
-	}
+	dir := *remoteSyncOptions.dir
+	filerAddress := *remoteSyncOptions.filerAddress
 
 	filerSource := &source.FilerSource{}
 	filerSource.DoInitialize(
-		*remoteSyncOptions.filerAddress,
-		pb.ServerToGrpcAddress(*remoteSyncOptions.filerAddress),
+		filerAddress,
+		pb.ServerToGrpcAddress(filerAddress),
 		"/", // does not matter
 		*remoteSyncOptions.readChunkFromFiler,
 	)
 
-	var found bool
-	for dir, remoteStorageMountLocation := range mappings.Mappings {
-		if *remoteSyncOptions.dir == dir {
-			found = true
-			storageConf, readErr := filer.ReadRemoteStorageConf(grpcDialOption, *remoteSyncOptions.filerAddress, remoteStorageMountLocation.Name)
-			if readErr != nil {
-				fmt.Printf("read remote storage configuration for %s: %v", dir, readErr)
-				continue
-			}
-			fmt.Printf("synchronize %s to remote storage...\n", *remoteSyncOptions.dir)
-			if err := util.Retry("filer.remote.sync "+dir, func() error {
-				return followUpdatesAndUploadToRemote(&remoteSyncOptions, filerSource, dir, storageConf, remoteStorageMountLocation)
-			}); err != nil {
-				fmt.Printf("synchronize %s: %v\n", *remoteSyncOptions.dir, err)
-			}
-			break
-		}
-	}
-	if !found {
-		fmt.Printf("directory %s is not mounted to any remote storage\n", *remoteSyncOptions.dir)
-		return false
-	}
-
-	return true
-}
-
-func followUpdatesAndUploadToRemote(option *RemoteSyncOptions, filerSource *source.FilerSource, mountedDir string, remoteStorage *filer_pb.RemoteConf, remoteStorageMountLocation *filer_pb.RemoteStorageLocation) error {
-
-	dirHash := util.HashStringToLong(mountedDir)
-
-	// 1. specified by timeAgo
-	// 2. last offset timestamp for this directory
-	// 3. directory creation time
-	var lastOffsetTs time.Time
-	if *option.timeAgo == 0 {
-		mountedDirEntry, err := filer_pb.GetEntry(option, util.FullPath(mountedDir))
+	remoteSyncOptions.bucketsDir = "/buckets"
+	// check buckets again
+	remoteSyncOptions.WithFilerClient(func(filerClient filer_pb.SeaweedFilerClient) error {
+		resp, err := filerClient.GetFilerConfiguration(context.Background(), &filer_pb.GetFilerConfigurationRequest{})
 		if err != nil {
-			return fmt.Errorf("lookup %s: %v", mountedDir, err)
-		}
-
-		lastOffsetTsNs, err := getOffset(option.grpcDialOption, *option.filerAddress, RemoteSyncKeyPrefix, int32(dirHash))
-		if err == nil && mountedDirEntry.Attributes.Crtime < lastOffsetTsNs/1000000 {
-			lastOffsetTs = time.Unix(0, lastOffsetTsNs)
-			glog.V(0).Infof("resume from %v", lastOffsetTs)
-		} else {
-			lastOffsetTs = time.Unix(mountedDirEntry.Attributes.Crtime, 0)
-		}
-	} else {
-		lastOffsetTs = time.Now().Add(-*option.timeAgo)
-	}
-
-	client, err := remote_storage.GetRemoteStorage(remoteStorage)
-	if err != nil {
-		return err
-	}
-
-	eachEntryFunc := func(resp *filer_pb.SubscribeMetadataResponse) error {
-		message := resp.EventNotification
-		if message.OldEntry == nil && message.NewEntry == nil {
-			return nil
-		}
-		if message.OldEntry == nil && message.NewEntry != nil {
-			if len(message.NewEntry.Chunks) == 0 {
-				return nil
-			}
-			fmt.Printf("create: %+v\n", resp)
-			if !shouldSendToRemote(message.NewEntry) {
-				fmt.Printf("skipping creating: %+v\n", resp)
-				return nil
-			}
-			dest := toRemoteStorageLocation(util.FullPath(mountedDir), util.NewFullPath(message.NewParentPath, message.NewEntry.Name), remoteStorageMountLocation)
-			if message.NewEntry.IsDirectory {
-				return client.WriteDirectory(dest, message.NewEntry)
-			}
-			reader := filer.NewChunkStreamReader(filerSource, message.NewEntry.Chunks)
-			remoteEntry, writeErr := client.WriteFile(dest, message.NewEntry, reader)
-			if writeErr != nil {
-				return writeErr
-			}
-			return updateLocalEntry(&remoteSyncOptions, message.NewParentPath, message.NewEntry, remoteEntry)
-		}
-		if message.OldEntry != nil && message.NewEntry == nil {
-			fmt.Printf("delete: %+v\n", resp)
-			dest := toRemoteStorageLocation(util.FullPath(mountedDir), util.NewFullPath(resp.Directory, message.OldEntry.Name), remoteStorageMountLocation)
-			return client.DeleteFile(dest)
+			return err
 		}
-		if message.OldEntry != nil && message.NewEntry != nil {
-			oldDest := toRemoteStorageLocation(util.FullPath(mountedDir), util.NewFullPath(resp.Directory, message.OldEntry.Name), remoteStorageMountLocation)
-			dest := toRemoteStorageLocation(util.FullPath(mountedDir), util.NewFullPath(message.NewParentPath, message.NewEntry.Name), remoteStorageMountLocation)
-			if !shouldSendToRemote(message.NewEntry) {
-				fmt.Printf("skipping updating: %+v\n", resp)
-				return nil
-			}
-			if message.NewEntry.IsDirectory {
-				return client.WriteDirectory(dest, message.NewEntry)
-			}
-			if resp.Directory == message.NewParentPath && message.OldEntry.Name == message.NewEntry.Name {
-				if isSameChunks(message.OldEntry.Chunks, message.NewEntry.Chunks) {
-					fmt.Printf("update meta: %+v\n", resp)
-					return client.UpdateFileMetadata(dest, message.NewEntry)
-				}
-			}
-			fmt.Printf("update: %+v\n", resp)
-			if err := client.DeleteFile(oldDest); err != nil {
-				return err
-			}
-			reader := filer.NewChunkStreamReader(filerSource, message.NewEntry.Chunks)
-			remoteEntry, writeErr := client.WriteFile(dest, message.NewEntry, reader)
-			if writeErr != nil {
-				return writeErr
-			}
-			return updateLocalEntry(&remoteSyncOptions, message.NewParentPath, message.NewEntry, remoteEntry)
-		}
-
+		remoteSyncOptions.bucketsDir = resp.DirBuckets
 		return nil
-	}
-
-	processEventFnWithOffset := pb.AddOffsetFunc(eachEntryFunc, 3*time.Second, func(counter int64, lastTsNs int64) error {
-		lastTime := time.Unix(0, lastTsNs)
-		glog.V(0).Infof("remote sync %s progressed to %v %0.2f/sec", *option.filerAddress, lastTime, float64(counter)/float64(3))
-		return setOffset(option.grpcDialOption, *option.filerAddress, RemoteSyncKeyPrefix, int32(dirHash), lastTsNs)
 	})
 
-	return pb.FollowMetadata(*option.filerAddress, option.grpcDialOption,
-		"filer.remote.sync", mountedDir, lastOffsetTs.UnixNano(), 0, processEventFnWithOffset, false)
-}
-
-func toRemoteStorageLocation(mountDir, sourcePath util.FullPath, remoteMountLocation *filer_pb.RemoteStorageLocation) *filer_pb.RemoteStorageLocation {
-	source := string(sourcePath[len(mountDir):])
-	dest := util.FullPath(remoteMountLocation.Path).Child(source)
-	return &filer_pb.RemoteStorageLocation{
-		Name:   remoteMountLocation.Name,
-		Bucket: remoteMountLocation.Bucket,
-		Path:   string(dest),
-	}
-}
-
-func isSameChunks(a, b []*filer_pb.FileChunk) bool {
-	if len(a) != len(b) {
-		return false
-	}
-	for i := 0; i < len(a); i++ {
-		x, y := a[i], b[i]
-		if !proto.Equal(x, y) {
-			return false
-		}
-	}
-	return true
-}
-
-func shouldSendToRemote(entry *filer_pb.Entry) bool {
-	if entry.RemoteEntry == nil {
+	if dir != "" && dir != remoteSyncOptions.bucketsDir {
+		fmt.Printf("synchronize %s to remote storage...\n", dir)
+		util.RetryForever("filer.remote.sync "+dir, func() error {
+			return followUpdatesAndUploadToRemote(&remoteSyncOptions, filerSource, dir)
+		}, func(err error) bool {
+			if err != nil {
+				glog.Errorf("synchronize %s: %v", dir, err)
+			}
+			return true
+		})
 		return true
 	}
-	if entry.RemoteEntry.LastLocalSyncTsNs/1e9 < entry.Attributes.Mtime {
+
+	// read filer remote storage mount mappings
+	if detectErr := remoteSyncOptions.collectRemoteStorageConf(); detectErr != nil {
+		fmt.Fprintf(os.Stderr, "read mount info: %v\n", detectErr)
 		return true
 	}
-	return false
-}
 
-func updateLocalEntry(filerClient filer_pb.FilerClient, dir string, entry *filer_pb.Entry, remoteEntry *filer_pb.RemoteEntry) error {
-	entry.RemoteEntry = remoteEntry
-	return filerClient.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
-		_, err := client.UpdateEntry(context.Background(), &filer_pb.UpdateEntryRequest{
-			Directory: dir,
-			Entry:     entry,
-		})
-		return err
+	// synchronize /buckets folder
+	fmt.Printf("synchronize buckets in %s ...\n", remoteSyncOptions.bucketsDir)
+	util.RetryForever("filer.remote.sync buckets", func() error {
+		return remoteSyncOptions.followBucketUpdatesAndUploadToRemote(filerSource)
+	}, func(err error) bool {
+		if err != nil {
+			glog.Errorf("synchronize %s: %v", remoteSyncOptions.bucketsDir, err)
+		}
+		return true
 	})
+	return true
+
 }
diff --git a/weed/command/filer_remote_sync_buckets.go b/weed/command/filer_remote_sync_buckets.go
new file mode 100644
index 000000000..70f9f49c1
--- /dev/null
+++ b/weed/command/filer_remote_sync_buckets.go
@@ -0,0 +1,387 @@
+package command
+
+import (
+	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/filer"
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/remote_pb"
+	"github.com/chrislusf/seaweedfs/weed/remote_storage"
+	"github.com/chrislusf/seaweedfs/weed/replication/source"
+	"github.com/chrislusf/seaweedfs/weed/util"
+	"github.com/golang/protobuf/proto"
+	"math"
+	"math/rand"
+	"strings"
+	"time"
+)
+
+func (option *RemoteSyncOptions) followBucketUpdatesAndUploadToRemote(filerSource *source.FilerSource) error {
+
+	// read filer remote storage mount mappings
+	if detectErr := option.collectRemoteStorageConf(); detectErr != nil {
+		return fmt.Errorf("read mount info: %v", detectErr)
+	}
+
+	eachEntryFunc, err := option.makeBucketedEventProcessor(filerSource)
+	if err != nil {
+		return err
+	}
+
+	processEventFnWithOffset := pb.AddOffsetFunc(eachEntryFunc, 3*time.Second, func(counter int64, lastTsNs int64) error {
+		lastTime := time.Unix(0, lastTsNs)
+		glog.V(0).Infof("remote sync %s progressed to %v %0.2f/sec", *option.filerAddress, lastTime, float64(counter)/float64(3))
+		return remote_storage.SetSyncOffset(option.grpcDialOption, *option.filerAddress, option.bucketsDir, lastTsNs)
+	})
+
+	lastOffsetTs := collectLastSyncOffset(option, option.bucketsDir)
+
+	return pb.FollowMetadata(*option.filerAddress, option.grpcDialOption, "filer.remote.sync",
+		option.bucketsDir, []string{filer.DirectoryEtcRemote}, lastOffsetTs.UnixNano(), 0, processEventFnWithOffset, false)
+}
+
+func (option *RemoteSyncOptions) makeBucketedEventProcessor(filerSource *source.FilerSource) (pb.ProcessMetadataFunc, error) {
+
+	handleCreateBucket := func(entry *filer_pb.Entry) error {
+		if !entry.IsDirectory {
+			return nil
+		}
+		if entry.RemoteEntry != nil {
+			// this directory is imported from "remote.mount.buckets" or "remote.mount"
+			return nil
+		}
+		if option.mappings.PrimaryBucketStorageName != "" && *option.createBucketAt == "" {
+			*option.createBucketAt = option.mappings.PrimaryBucketStorageName
+			glog.V(0).Infof("%s is set as the primary remote storage", *option.createBucketAt)
+		}
+		if len(option.mappings.Mappings) == 1 && *option.createBucketAt == "" {
+			for k := range option.mappings.Mappings {
+				*option.createBucketAt = k
+				glog.V(0).Infof("%s is set as the only remote storage", *option.createBucketAt)
+			}
+		}
+		if *option.createBucketAt == "" {
+			return nil
+		}
+		remoteConf, found := option.remoteConfs[*option.createBucketAt]
+		if !found {
+			return fmt.Errorf("un-configured remote storage %s", *option.createBucketAt)
+		}
+
+		client, err := remote_storage.GetRemoteStorage(remoteConf)
+		if err != nil {
+			return err
+		}
+
+		bucketName := strings.ToLower(entry.Name)
+		if *option.createBucketRandomSuffix {
+			// https://docs.aws.amazon.com/AmazonS3/latest/userguide/bucketnamingrules.html
+			if len(bucketName)+5 > 63 {
+				bucketName = bucketName[:58]
+			}
+			bucketName = fmt.Sprintf("%s-%4d", bucketName, rand.Uint32()%10000)
+		}
+
+		glog.V(0).Infof("create bucket %s", bucketName)
+		if err := client.CreateBucket(bucketName); err != nil {
+			return fmt.Errorf("create bucket %s in %s: %v", bucketName, remoteConf.Name, err)
+		}
+
+		bucketPath := util.FullPath(option.bucketsDir).Child(entry.Name)
+		remoteLocation := &remote_pb.RemoteStorageLocation{
+			Name:   *option.createBucketAt,
+			Bucket: bucketName,
+			Path:   "/",
+		}
+
+		// need to add new mapping here before getting upates from metadata tailing
+		option.mappings.Mappings[string(bucketPath)] = remoteLocation
+
+		return filer.InsertMountMapping(option, string(bucketPath), remoteLocation)
+
+	}
+	handleDeleteBucket := func(entry *filer_pb.Entry) error {
+		if !entry.IsDirectory {
+			return nil
+		}
+
+		client, remoteStorageMountLocation, err := option.findRemoteStorageClient(entry.Name)
+		if err != nil {
+			return fmt.Errorf("findRemoteStorageClient %s: %v", entry.Name, err)
+		}
+
+		glog.V(0).Infof("delete remote bucket %s", remoteStorageMountLocation.Bucket)
+		if err := client.DeleteBucket(remoteStorageMountLocation.Bucket); err != nil {
+			return fmt.Errorf("delete remote bucket %s: %v", remoteStorageMountLocation.Bucket, err)
+		}
+
+		bucketPath := util.FullPath(option.bucketsDir).Child(entry.Name)
+
+		return filer.DeleteMountMapping(option, string(bucketPath))
+	}
+
+	handleEtcRemoteChanges := func(resp *filer_pb.SubscribeMetadataResponse) error {
+		message := resp.EventNotification
+		if message.NewEntry != nil {
+			// update
+			if message.NewEntry.Name == filer.REMOTE_STORAGE_MOUNT_FILE {
+				newMappings, readErr := filer.UnmarshalRemoteStorageMappings(message.NewEntry.Content)
+				if readErr != nil {
+					return fmt.Errorf("unmarshal mappings: %v", readErr)
+				}
+				option.mappings = newMappings
+			}
+			if strings.HasSuffix(message.NewEntry.Name, filer.REMOTE_STORAGE_CONF_SUFFIX) {
+				conf := &remote_pb.RemoteConf{}
+				if err := proto.Unmarshal(message.NewEntry.Content, conf); err != nil {
+					return fmt.Errorf("unmarshal %s/%s: %v", filer.DirectoryEtcRemote, message.NewEntry.Name, err)
+				}
+				option.remoteConfs[conf.Name] = conf
+			}
+		} else if message.OldEntry != nil {
+			// deletion
+			if strings.HasSuffix(message.OldEntry.Name, filer.REMOTE_STORAGE_CONF_SUFFIX) {
+				conf := &remote_pb.RemoteConf{}
+				if err := proto.Unmarshal(message.OldEntry.Content, conf); err != nil {
+					return fmt.Errorf("unmarshal %s/%s: %v", filer.DirectoryEtcRemote, message.OldEntry.Name, err)
+				}
+				delete(option.remoteConfs, conf.Name)
+			}
+		}
+
+		return nil
+	}
+
+	eachEntryFunc := func(resp *filer_pb.SubscribeMetadataResponse) error {
+		message := resp.EventNotification
+		if strings.HasPrefix(resp.Directory, filer.DirectoryEtcRemote) {
+			return handleEtcRemoteChanges(resp)
+		}
+
+		if message.OldEntry == nil && message.NewEntry == nil {
+			return nil
+		}
+		if message.OldEntry == nil && message.NewEntry != nil {
+			if message.NewParentPath == option.bucketsDir {
+				return handleCreateBucket(message.NewEntry)
+			}
+			if !filer.HasData(message.NewEntry) {
+				return nil
+			}
+			bucket, remoteStorageMountLocation, remoteStorage, ok := option.detectBucketInfo(message.NewParentPath)
+			if !ok {
+				return nil
+			}
+			client, err := remote_storage.GetRemoteStorage(remoteStorage)
+			if err != nil {
+				return err
+			}
+			glog.V(2).Infof("create: %+v", resp)
+			if !shouldSendToRemote(message.NewEntry) {
+				glog.V(2).Infof("skipping creating: %+v", resp)
+				return nil
+			}
+			dest := toRemoteStorageLocation(bucket, util.NewFullPath(message.NewParentPath, message.NewEntry.Name), remoteStorageMountLocation)
+			if message.NewEntry.IsDirectory {
+				glog.V(0).Infof("mkdir  %s", remote_storage.FormatLocation(dest))
+				return client.WriteDirectory(dest, message.NewEntry)
+			}
+			glog.V(0).Infof("create %s", remote_storage.FormatLocation(dest))
+			reader := filer.NewFileReader(filerSource, message.NewEntry)
+			remoteEntry, writeErr := client.WriteFile(dest, message.NewEntry, reader)
+			if writeErr != nil {
+				return writeErr
+			}
+			return updateLocalEntry(&remoteSyncOptions, message.NewParentPath, message.NewEntry, remoteEntry)
+		}
+		if message.OldEntry != nil && message.NewEntry == nil {
+			if resp.Directory == option.bucketsDir {
+				return handleDeleteBucket(message.OldEntry)
+			}
+			bucket, remoteStorageMountLocation, remoteStorage, ok := option.detectBucketInfo(resp.Directory)
+			if !ok {
+				return nil
+			}
+			client, err := remote_storage.GetRemoteStorage(remoteStorage)
+			if err != nil {
+				return err
+			}
+			glog.V(2).Infof("delete: %+v", resp)
+			dest := toRemoteStorageLocation(bucket, util.NewFullPath(resp.Directory, message.OldEntry.Name), remoteStorageMountLocation)
+			if message.OldEntry.IsDirectory {
+				glog.V(0).Infof("rmdir  %s", remote_storage.FormatLocation(dest))
+				return client.RemoveDirectory(dest)
+			}
+			glog.V(0).Infof("delete %s", remote_storage.FormatLocation(dest))
+			return client.DeleteFile(dest)
+		}
+		if message.OldEntry != nil && message.NewEntry != nil {
+			if resp.Directory == option.bucketsDir {
+				if message.NewParentPath == option.bucketsDir {
+					if message.OldEntry.Name == message.NewEntry.Name {
+						return nil
+					}
+					if err := handleCreateBucket(message.NewEntry); err != nil {
+						return err
+					}
+					if err := handleDeleteBucket(message.OldEntry); err != nil {
+						return err
+					}
+				}
+			}
+			oldBucket, oldRemoteStorageMountLocation, oldRemoteStorage, oldOk := option.detectBucketInfo(resp.Directory)
+			newBucket, newRemoteStorageMountLocation, newRemoteStorage, newOk := option.detectBucketInfo(message.NewParentPath)
+			if oldOk && newOk {
+				if !shouldSendToRemote(message.NewEntry) {
+					glog.V(2).Infof("skipping updating: %+v", resp)
+					return nil
+				}
+				client, err := remote_storage.GetRemoteStorage(oldRemoteStorage)
+				if err != nil {
+					return err
+				}
+				if resp.Directory == message.NewParentPath && message.OldEntry.Name == message.NewEntry.Name {
+					// update the same entry
+					if message.NewEntry.IsDirectory {
+						// update directory property
+						return nil
+					}
+					if filer.IsSameData(message.OldEntry, message.NewEntry) {
+						glog.V(2).Infof("update meta: %+v", resp)
+						oldDest := toRemoteStorageLocation(oldBucket, util.NewFullPath(resp.Directory, message.OldEntry.Name), oldRemoteStorageMountLocation)
+						return client.UpdateFileMetadata(oldDest, message.OldEntry, message.NewEntry)
+					} else {
+						newDest := toRemoteStorageLocation(newBucket, util.NewFullPath(message.NewParentPath, message.NewEntry.Name), newRemoteStorageMountLocation)
+						reader := filer.NewFileReader(filerSource, message.NewEntry)
+						glog.V(0).Infof("create %s", remote_storage.FormatLocation(newDest))
+						remoteEntry, writeErr := client.WriteFile(newDest, message.NewEntry, reader)
+						if writeErr != nil {
+							return writeErr
+						}
+						return updateLocalEntry(&remoteSyncOptions, message.NewParentPath, message.NewEntry, remoteEntry)
+					}
+				}
+			}
+
+			// the following is entry rename
+			if oldOk {
+				client, err := remote_storage.GetRemoteStorage(oldRemoteStorage)
+				if err != nil {
+					return err
+				}
+				oldDest := toRemoteStorageLocation(oldBucket, util.NewFullPath(resp.Directory, message.OldEntry.Name), oldRemoteStorageMountLocation)
+				if message.OldEntry.IsDirectory {
+					return client.RemoveDirectory(oldDest)
+				}
+				glog.V(0).Infof("delete %s", remote_storage.FormatLocation(oldDest))
+				if err := client.DeleteFile(oldDest); err != nil {
+					return err
+				}
+			}
+			if newOk {
+				if !shouldSendToRemote(message.NewEntry) {
+					glog.V(2).Infof("skipping updating: %+v", resp)
+					return nil
+				}
+				client, err := remote_storage.GetRemoteStorage(newRemoteStorage)
+				if err != nil {
+					return err
+				}
+				newDest := toRemoteStorageLocation(newBucket, util.NewFullPath(message.NewParentPath, message.NewEntry.Name), newRemoteStorageMountLocation)
+				if message.NewEntry.IsDirectory {
+					return client.WriteDirectory(newDest, message.NewEntry)
+				}
+				reader := filer.NewFileReader(filerSource, message.NewEntry)
+				glog.V(0).Infof("create %s", remote_storage.FormatLocation(newDest))
+				remoteEntry, writeErr := client.WriteFile(newDest, message.NewEntry, reader)
+				if writeErr != nil {
+					return writeErr
+				}
+				return updateLocalEntry(&remoteSyncOptions, message.NewParentPath, message.NewEntry, remoteEntry)
+			}
+		}
+
+		return nil
+	}
+	return eachEntryFunc, nil
+}
+
+func (option *RemoteSyncOptions) findRemoteStorageClient(bucketName string) (client remote_storage.RemoteStorageClient, remoteStorageMountLocation *remote_pb.RemoteStorageLocation, err error) {
+	bucket := util.FullPath(option.bucketsDir).Child(bucketName)
+
+	var isMounted bool
+	remoteStorageMountLocation, isMounted = option.mappings.Mappings[string(bucket)]
+	if !isMounted {
+		return nil, remoteStorageMountLocation, fmt.Errorf("%s is not mounted", bucket)
+	}
+	remoteConf, hasClient := option.remoteConfs[remoteStorageMountLocation.Name]
+	if !hasClient {
+		return nil, remoteStorageMountLocation, fmt.Errorf("%s mounted to un-configured %+v", bucket, remoteStorageMountLocation)
+	}
+
+	client, err = remote_storage.GetRemoteStorage(remoteConf)
+	if err != nil {
+		return nil, remoteStorageMountLocation, err
+	}
+	return client, remoteStorageMountLocation, nil
+}
+
+func (option *RemoteSyncOptions) detectBucketInfo(actualDir string) (bucket util.FullPath, remoteStorageMountLocation *remote_pb.RemoteStorageLocation, remoteConf *remote_pb.RemoteConf, ok bool) {
+	bucket, ok = extractBucketPath(option.bucketsDir, actualDir)
+	if !ok {
+		return "", nil, nil, false
+	}
+	var isMounted bool
+	remoteStorageMountLocation, isMounted = option.mappings.Mappings[string(bucket)]
+	if !isMounted {
+		glog.Warningf("%s is not mounted", bucket)
+		return "", nil, nil, false
+	}
+	var hasClient bool
+	remoteConf, hasClient = option.remoteConfs[remoteStorageMountLocation.Name]
+	if !hasClient {
+		glog.Warningf("%s mounted to un-configured %+v", bucket, remoteStorageMountLocation)
+		return "", nil, nil, false
+	}
+	return bucket, remoteStorageMountLocation, remoteConf, true
+}
+
+func extractBucketPath(bucketsDir, dir string) (util.FullPath, bool) {
+	if !strings.HasPrefix(dir, bucketsDir+"/") {
+		return "", false
+	}
+	parts := strings.SplitN(dir[len(bucketsDir)+1:], "/", 2)
+	return util.FullPath(bucketsDir).Child(parts[0]), true
+}
+
+func (option *RemoteSyncOptions) collectRemoteStorageConf() (err error) {
+
+	if mappings, err := filer.ReadMountMappings(option.grpcDialOption, *option.filerAddress); err != nil {
+		return err
+	} else {
+		option.mappings = mappings
+	}
+
+	option.remoteConfs = make(map[string]*remote_pb.RemoteConf)
+	var lastConfName string
+	err = filer_pb.List(option, filer.DirectoryEtcRemote, "", func(entry *filer_pb.Entry, isLast bool) error {
+		if !strings.HasSuffix(entry.Name, filer.REMOTE_STORAGE_CONF_SUFFIX) {
+			return nil
+		}
+		conf := &remote_pb.RemoteConf{}
+		if err := proto.Unmarshal(entry.Content, conf); err != nil {
+			return fmt.Errorf("unmarshal %s/%s: %v", filer.DirectoryEtcRemote, entry.Name, err)
+		}
+		option.remoteConfs[conf.Name] = conf
+		lastConfName = conf.Name
+		return nil
+	}, "", false, math.MaxUint32)
+
+	if option.mappings.PrimaryBucketStorageName == "" && len(option.remoteConfs) == 1 {
+		glog.V(0).Infof("%s is set to the default remote storage", lastConfName)
+		option.mappings.PrimaryBucketStorageName = lastConfName
+	}
+
+	return
+}
diff --git a/weed/command/filer_remote_sync_dir.go b/weed/command/filer_remote_sync_dir.go
new file mode 100644
index 000000000..dc2e9a1fb
--- /dev/null
+++ b/weed/command/filer_remote_sync_dir.go
@@ -0,0 +1,221 @@
+package command
+
+import (
+	"context"
+	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/filer"
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/remote_pb"
+	"github.com/chrislusf/seaweedfs/weed/remote_storage"
+	"github.com/chrislusf/seaweedfs/weed/replication/source"
+	"github.com/chrislusf/seaweedfs/weed/util"
+	"github.com/golang/protobuf/proto"
+	"os"
+	"strings"
+	"time"
+)
+
+func followUpdatesAndUploadToRemote(option *RemoteSyncOptions, filerSource *source.FilerSource, mountedDir string) error {
+
+	// read filer remote storage mount mappings
+	_, _, remoteStorageMountLocation, remoteStorage, detectErr := filer.DetectMountInfo(option.grpcDialOption, *option.filerAddress, mountedDir)
+	if detectErr != nil {
+		return fmt.Errorf("read mount info: %v", detectErr)
+	}
+
+	eachEntryFunc, err := makeEventProcessor(remoteStorage, mountedDir, remoteStorageMountLocation, filerSource)
+	if err != nil {
+		return err
+	}
+
+	processEventFnWithOffset := pb.AddOffsetFunc(eachEntryFunc, 3*time.Second, func(counter int64, lastTsNs int64) error {
+		lastTime := time.Unix(0, lastTsNs)
+		glog.V(0).Infof("remote sync %s progressed to %v %0.2f/sec", *option.filerAddress, lastTime, float64(counter)/float64(3))
+		return remote_storage.SetSyncOffset(option.grpcDialOption, *option.filerAddress, mountedDir, lastTsNs)
+	})
+
+	lastOffsetTs := collectLastSyncOffset(option, mountedDir)
+
+	return pb.FollowMetadata(*option.filerAddress, option.grpcDialOption, "filer.remote.sync",
+		mountedDir, []string{filer.DirectoryEtcRemote}, lastOffsetTs.UnixNano(), 0, processEventFnWithOffset, false)
+}
+
+func makeEventProcessor(remoteStorage *remote_pb.RemoteConf, mountedDir string, remoteStorageMountLocation *remote_pb.RemoteStorageLocation, filerSource *source.FilerSource) (pb.ProcessMetadataFunc, error) {
+	client, err := remote_storage.GetRemoteStorage(remoteStorage)
+	if err != nil {
+		return nil, err
+	}
+
+	handleEtcRemoteChanges := func(resp *filer_pb.SubscribeMetadataResponse) error {
+		message := resp.EventNotification
+		if message.NewEntry == nil {
+			return nil
+		}
+		if message.NewEntry.Name == filer.REMOTE_STORAGE_MOUNT_FILE {
+			mappings, readErr := filer.UnmarshalRemoteStorageMappings(message.NewEntry.Content)
+			if readErr != nil {
+				return fmt.Errorf("unmarshal mappings: %v", readErr)
+			}
+			if remoteLoc, found := mappings.Mappings[mountedDir]; found {
+				if remoteStorageMountLocation.Bucket != remoteLoc.Bucket || remoteStorageMountLocation.Path != remoteLoc.Path {
+					glog.Fatalf("Unexpected mount changes %+v => %+v", remoteStorageMountLocation, remoteLoc)
+				}
+			} else {
+				glog.V(0).Infof("unmounted %s exiting ...", mountedDir)
+				os.Exit(0)
+			}
+		}
+		if message.NewEntry.Name == remoteStorage.Name+filer.REMOTE_STORAGE_CONF_SUFFIX {
+			conf := &remote_pb.RemoteConf{}
+			if err := proto.Unmarshal(message.NewEntry.Content, conf); err != nil {
+				return fmt.Errorf("unmarshal %s/%s: %v", filer.DirectoryEtcRemote, message.NewEntry.Name, err)
+			}
+			remoteStorage = conf
+			if newClient, err := remote_storage.GetRemoteStorage(remoteStorage); err == nil {
+				client = newClient
+			} else {
+				return err
+			}
+		}
+
+		return nil
+	}
+
+	eachEntryFunc := func(resp *filer_pb.SubscribeMetadataResponse) error {
+		message := resp.EventNotification
+		if strings.HasPrefix(resp.Directory, filer.DirectoryEtcRemote) {
+			return handleEtcRemoteChanges(resp)
+		}
+
+		if message.OldEntry == nil && message.NewEntry == nil {
+			return nil
+		}
+		if message.OldEntry == nil && message.NewEntry != nil {
+			if !filer.HasData(message.NewEntry) {
+				return nil
+			}
+			glog.V(2).Infof("create: %+v", resp)
+			if !shouldSendToRemote(message.NewEntry) {
+				glog.V(2).Infof("skipping creating: %+v", resp)
+				return nil
+			}
+			dest := toRemoteStorageLocation(util.FullPath(mountedDir), util.NewFullPath(message.NewParentPath, message.NewEntry.Name), remoteStorageMountLocation)
+			if message.NewEntry.IsDirectory {
+				glog.V(0).Infof("mkdir  %s", remote_storage.FormatLocation(dest))
+				return client.WriteDirectory(dest, message.NewEntry)
+			}
+			glog.V(0).Infof("create %s", remote_storage.FormatLocation(dest))
+			reader := filer.NewFileReader(filerSource, message.NewEntry)
+			remoteEntry, writeErr := client.WriteFile(dest, message.NewEntry, reader)
+			if writeErr != nil {
+				return writeErr
+			}
+			return updateLocalEntry(&remoteSyncOptions, message.NewParentPath, message.NewEntry, remoteEntry)
+		}
+		if message.OldEntry != nil && message.NewEntry == nil {
+			glog.V(2).Infof("delete: %+v", resp)
+			dest := toRemoteStorageLocation(util.FullPath(mountedDir), util.NewFullPath(resp.Directory, message.OldEntry.Name), remoteStorageMountLocation)
+			if message.OldEntry.IsDirectory {
+				glog.V(0).Infof("rmdir  %s", remote_storage.FormatLocation(dest))
+				return client.RemoveDirectory(dest)
+			}
+			glog.V(0).Infof("delete %s", remote_storage.FormatLocation(dest))
+			return client.DeleteFile(dest)
+		}
+		if message.OldEntry != nil && message.NewEntry != nil {
+			oldDest := toRemoteStorageLocation(util.FullPath(mountedDir), util.NewFullPath(resp.Directory, message.OldEntry.Name), remoteStorageMountLocation)
+			dest := toRemoteStorageLocation(util.FullPath(mountedDir), util.NewFullPath(message.NewParentPath, message.NewEntry.Name), remoteStorageMountLocation)
+			if !shouldSendToRemote(message.NewEntry) {
+				glog.V(2).Infof("skipping updating: %+v", resp)
+				return nil
+			}
+			if message.NewEntry.IsDirectory {
+				return client.WriteDirectory(dest, message.NewEntry)
+			}
+			if resp.Directory == message.NewParentPath && message.OldEntry.Name == message.NewEntry.Name {
+				if filer.IsSameData(message.OldEntry, message.NewEntry) {
+					glog.V(2).Infof("update meta: %+v", resp)
+					return client.UpdateFileMetadata(dest, message.OldEntry, message.NewEntry)
+				}
+			}
+			glog.V(2).Infof("update: %+v", resp)
+			glog.V(0).Infof("delete %s", remote_storage.FormatLocation(oldDest))
+			if err := client.DeleteFile(oldDest); err != nil {
+				return err
+			}
+			reader := filer.NewFileReader(filerSource, message.NewEntry)
+			glog.V(0).Infof("create %s", remote_storage.FormatLocation(dest))
+			remoteEntry, writeErr := client.WriteFile(dest, message.NewEntry, reader)
+			if writeErr != nil {
+				return writeErr
+			}
+			return updateLocalEntry(&remoteSyncOptions, message.NewParentPath, message.NewEntry, remoteEntry)
+		}
+
+		return nil
+	}
+	return eachEntryFunc, nil
+}
+
+func collectLastSyncOffset(option *RemoteSyncOptions, mountedDir string) time.Time {
+	// 1. specified by timeAgo
+	// 2. last offset timestamp for this directory
+	// 3. directory creation time
+	var lastOffsetTs time.Time
+	if *option.timeAgo == 0 {
+		mountedDirEntry, err := filer_pb.GetEntry(option, util.FullPath(mountedDir))
+		if err != nil {
+			glog.V(0).Infof("get mounted directory %s: %v", mountedDir, err)
+			return time.Now()
+		}
+
+		lastOffsetTsNs, err := remote_storage.GetSyncOffset(option.grpcDialOption, *option.filerAddress, mountedDir)
+		if mountedDirEntry != nil {
+			if err == nil && mountedDirEntry.Attributes.Crtime < lastOffsetTsNs/1000000 {
+				lastOffsetTs = time.Unix(0, lastOffsetTsNs)
+				glog.V(0).Infof("resume from %v", lastOffsetTs)
+			} else {
+				lastOffsetTs = time.Unix(mountedDirEntry.Attributes.Crtime, 0)
+			}
+		} else {
+			lastOffsetTs = time.Now()
+		}
+	} else {
+		lastOffsetTs = time.Now().Add(-*option.timeAgo)
+	}
+	return lastOffsetTs
+}
+
+func toRemoteStorageLocation(mountDir, sourcePath util.FullPath, remoteMountLocation *remote_pb.RemoteStorageLocation) *remote_pb.RemoteStorageLocation {
+	source := string(sourcePath[len(mountDir):])
+	dest := util.FullPath(remoteMountLocation.Path).Child(source)
+	return &remote_pb.RemoteStorageLocation{
+		Name:   remoteMountLocation.Name,
+		Bucket: remoteMountLocation.Bucket,
+		Path:   string(dest),
+	}
+}
+
+func shouldSendToRemote(entry *filer_pb.Entry) bool {
+	if entry.RemoteEntry == nil {
+		return true
+	}
+	if entry.RemoteEntry.RemoteMtime < entry.Attributes.Mtime {
+		return true
+	}
+	return false
+}
+
+func updateLocalEntry(filerClient filer_pb.FilerClient, dir string, entry *filer_pb.Entry, remoteEntry *filer_pb.RemoteEntry) error {
+	remoteEntry.LastLocalSyncTsNs = time.Now().UnixNano()
+	entry.RemoteEntry = remoteEntry
+	return filerClient.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
+		_, err := client.UpdateEntry(context.Background(), &filer_pb.UpdateEntryRequest{
+			Directory: dir,
+			Entry:     entry,
+		})
+		return err
+	})
+}
diff --git a/weed/command/filer_sync.go b/weed/command/filer_sync.go
index 5440811dd..33efdb2b7 100644
--- a/weed/command/filer_sync.go
+++ b/weed/command/filer_sync.go
@@ -171,7 +171,7 @@ func doSubscribeFilerMetaChanges(grpcDialOption grpc.DialOption, sourceFiler, so
 	})
 
 	return pb.FollowMetadata(sourceFiler, grpcDialOption, "syncTo_"+targetFiler,
-		sourcePath, sourceFilerOffsetTsNs, targetFilerSignature, processEventFnWithOffset, false)
+		sourcePath, nil, sourceFilerOffsetTsNs, targetFilerSignature, processEventFnWithOffset, false)
 
 }
 
diff --git a/weed/command/filer_sync_std.go b/weed/command/filer_sync_std.go
index 63851eaf8..1f9b6fa14 100644
--- a/weed/command/filer_sync_std.go
+++ b/weed/command/filer_sync_std.go
@@ -1,3 +1,4 @@
+//go:build !windows
 // +build !windows
 
 package command
diff --git a/weed/command/imports.go b/weed/command/imports.go
index ce0bf0e10..a2f59189f 100644
--- a/weed/command/imports.go
+++ b/weed/command/imports.go
@@ -3,6 +3,9 @@ package command
 import (
 	_ "net/http/pprof"
 
+	_ "github.com/chrislusf/seaweedfs/weed/remote_storage/azure"
+	_ "github.com/chrislusf/seaweedfs/weed/remote_storage/gcs"
+	_ "github.com/chrislusf/seaweedfs/weed/remote_storage/hdfs"
 	_ "github.com/chrislusf/seaweedfs/weed/remote_storage/s3"
 
 	_ "github.com/chrislusf/seaweedfs/weed/replication/sink/azuresink"
@@ -27,4 +30,5 @@ import (
 	_ "github.com/chrislusf/seaweedfs/weed/filer/redis"
 	_ "github.com/chrislusf/seaweedfs/weed/filer/redis2"
 	_ "github.com/chrislusf/seaweedfs/weed/filer/sqlite"
+	_ "github.com/chrislusf/seaweedfs/weed/filer/tikv"
 )
diff --git a/weed/command/master.go b/weed/command/master.go
index 4eb43ee09..2605f6f4b 100644
--- a/weed/command/master.go
+++ b/weed/command/master.go
@@ -7,7 +7,6 @@ import (
 	"net/http"
 	"os"
 	"sort"
-	"strconv"
 	"strings"
 	"time"
 
@@ -116,7 +115,7 @@ func startMaster(masterOption MasterOptions, masterWhiteList []string) {
 
 	r := mux.NewRouter()
 	ms := weed_server.NewMasterServer(r, masterOption.toMasterOption(masterWhiteList), peers)
-	listeningAddress := *masterOption.ipBind + ":" + strconv.Itoa(*masterOption.port)
+	listeningAddress := util.JoinHostPort(*masterOption.ipBind, *masterOption.port)
 	glog.V(0).Infof("Start Seaweed Master %s at %s", util.Version(), listeningAddress)
 	masterListener, e := util.NewListener(listeningAddress, 0)
 	if e != nil {
@@ -132,7 +131,7 @@ func startMaster(masterOption MasterOptions, masterWhiteList []string) {
 	r.HandleFunc("/cluster/status", raftServer.StatusHandler).Methods("GET")
 	// starting grpc server
 	grpcPort := *masterOption.port + 10000
-	grpcL, err := util.NewListener(*masterOption.ipBind+":"+strconv.Itoa(grpcPort), 0)
+	grpcL, err := util.NewListener(util.JoinHostPort(*masterOption.ipBind, grpcPort), 0)
 	if err != nil {
 		glog.Fatalf("master failed to listen on grpc port %d: %v", grpcPort, err)
 	}
@@ -163,7 +162,7 @@ func startMaster(masterOption MasterOptions, masterWhiteList []string) {
 
 func checkPeers(masterIp string, masterPort int, peers string) (masterAddress string, cleanedPeers []string) {
 	glog.V(0).Infof("current: %s:%d peers:%s", masterIp, masterPort, peers)
-	masterAddress = masterIp + ":" + strconv.Itoa(masterPort)
+	masterAddress = util.JoinHostPort(masterIp, masterPort)
 	if peers != "" {
 		cleanedPeers = strings.Split(peers, ",")
 	}
diff --git a/weed/command/master_follower.go b/weed/command/master_follower.go
index b628f7abf..48548a389 100644
--- a/weed/command/master_follower.go
+++ b/weed/command/master_follower.go
@@ -13,7 +13,6 @@ import (
 	"github.com/gorilla/mux"
 	"google.golang.org/grpc/reflection"
 	"net/http"
-	"strconv"
 	"strings"
 	"time"
 )
@@ -114,7 +113,7 @@ func startMasterFollower(masterOptions MasterOptions) {
 
 	r := mux.NewRouter()
 	ms := weed_server.NewMasterServer(r, option, masters)
-	listeningAddress := *masterOptions.ipBind + ":" + strconv.Itoa(*masterOptions.port)
+	listeningAddress := util.JoinHostPort(*masterOptions.ipBind, *masterOptions.port)
 	glog.V(0).Infof("Start Seaweed Master %s at %s", util.Version(), listeningAddress)
 	masterListener, e := util.NewListener(listeningAddress, 0)
 	if e != nil {
@@ -123,7 +122,7 @@ func startMasterFollower(masterOptions MasterOptions) {
 
 	// starting grpc server
 	grpcPort := *masterOptions.port + 10000
-	grpcL, err := util.NewListener(*masterOptions.ipBind+":"+strconv.Itoa(grpcPort), 0)
+	grpcL, err := util.NewListener(util.JoinHostPort(*masterOptions.ipBind, grpcPort), 0)
 	if err != nil {
 		glog.Fatalf("master failed to listen on grpc port %d: %v", grpcPort, err)
 	}
diff --git a/weed/command/mount_notsupported.go b/weed/command/mount_notsupported.go
index f3c0de3d6..1e5c9f53d 100644
--- a/weed/command/mount_notsupported.go
+++ b/weed/command/mount_notsupported.go
@@ -1,6 +1,5 @@
-// +build !linux
-// +build !darwin
-// +build !freebsd
+//go:build !linux && !darwin && !freebsd
+// +build !linux,!darwin,!freebsd
 
 package command
 
diff --git a/weed/command/mount_std.go b/weed/command/mount_std.go
index cdf340067..e393e5894 100644
--- a/weed/command/mount_std.go
+++ b/weed/command/mount_std.go
@@ -1,3 +1,4 @@
+//go:build linux || darwin || freebsd
 // +build linux darwin freebsd
 
 package command
diff --git a/weed/command/msg_broker.go b/weed/command/msg_broker.go
index db0b4148d..403bbe317 100644
--- a/weed/command/msg_broker.go
+++ b/weed/command/msg_broker.go
@@ -3,7 +3,6 @@ package command
 import (
 	"context"
 	"fmt"
-	"strconv"
 	"time"
 
 	"google.golang.org/grpc/reflection"
@@ -100,7 +99,7 @@ func (msgBrokerOpt *MessageBrokerOptions) startQueueServer() bool {
 	}, grpcDialOption)
 
 	// start grpc listener
-	grpcL, err := util.NewListener(":"+strconv.Itoa(*msgBrokerOpt.port), 0)
+	grpcL, err := util.NewListener(util.JoinHostPort("", *msgBrokerOpt.port), 0)
 	if err != nil {
 		glog.Fatalf("failed to listen on grpc port %d: %v", *msgBrokerOpt.port, err)
 	}
diff --git a/weed/command/scaffold/filer.toml b/weed/command/scaffold/filer.toml
index 9e9258865..caf9d173d 100644
--- a/weed/command/scaffold/filer.toml
+++ b/weed/command/scaffold/filer.toml
@@ -44,7 +44,7 @@ dbFile = "./filer.db"                # sqlite db file
 # CREATE TABLE IF NOT EXISTS filemeta (
 #   dirhash     BIGINT               COMMENT 'first 64 bits of MD5 hash value of directory field',
 #   name        VARCHAR(1000) BINARY COMMENT 'directory or file name',
-#   directory   TEXT                 COMMENT 'full path to parent directory',
+#   directory   TEXT BINARY          COMMENT 'full path to parent directory',
 #   meta        LONGBLOB,
 #   PRIMARY KEY (dirhash, name)
 # ) DEFAULT CHARSET=utf8;
@@ -69,7 +69,7 @@ createTable = """
   CREATE TABLE IF NOT EXISTS ` + "`%s`" + ` (
     dirhash BIGINT,
     name VARCHAR(1000) BINARY,
-    directory TEXT,
+    directory TEXT BINARY,
     meta LONGBLOB,
     PRIMARY KEY (dirhash, name)
   ) DEFAULT CHARSET=utf8;
@@ -230,3 +230,11 @@ location = "/tmp/"
 address = "localhost:6379"
 password = ""
 database = 1
+
+[tikv]
+enabled = false
+# If you have many pd address, use ',' split then:
+#   pdaddrs = "pdhost1:2379, pdhost2:2379, pdhost3:2379"
+pdaddrs = "localhost:2379"
+# Concurrency for TiKV delete range
+deleterange_concurrency = 1
diff --git a/weed/command/server.go b/weed/command/server.go
index c784d90b9..b32d9d51e 100644
--- a/weed/command/server.go
+++ b/weed/command/server.go
@@ -194,7 +194,7 @@ func runServer(cmd *Command, args []string) bool {
 	filerOptions.disableHttp = serverDisableHttp
 	masterOptions.disableHttp = serverDisableHttp
 
-	filerAddress := fmt.Sprintf("%s:%d", *serverIp, *filerOptions.port)
+	filerAddress := util.JoinHostPort(*serverIp, *filerOptions.port)
 	s3Options.filer = &filerAddress
 	webdavOptions.filer = &filerAddress
 	msgBrokerOptions.filer = &filerAddress
diff --git a/weed/command/volume.go b/weed/command/volume.go
index 235eff11b..3278107f5 100644
--- a/weed/command/volume.go
+++ b/weed/command/volume.go
@@ -194,7 +194,7 @@ func (v VolumeServerOptions) startVolumeServer(volumeFolders, maxVolumeCounts, v
 		*v.publicPort = *v.port
 	}
 	if *v.publicUrl == "" {
-		*v.publicUrl = *v.ip + ":" + strconv.Itoa(*v.publicPort)
+		*v.publicUrl = util.JoinHostPort(*v.ip, *v.publicPort)
 	}
 
 	volumeMux := http.NewServeMux()
@@ -308,7 +308,7 @@ func (v VolumeServerOptions) isSeparatedPublicPort() bool {
 
 func (v VolumeServerOptions) startGrpcService(vs volume_server_pb.VolumeServerServer) *grpc.Server {
 	grpcPort := *v.port + 10000
-	grpcL, err := util.NewListener(*v.bindIp+":"+strconv.Itoa(grpcPort), 0)
+	grpcL, err := util.NewListener(util.JoinHostPort(*v.bindIp, grpcPort), 0)
 	if err != nil {
 		glog.Fatalf("failed to listen on grpc port %d: %v", grpcPort, err)
 	}
@@ -324,7 +324,7 @@ func (v VolumeServerOptions) startGrpcService(vs volume_server_pb.VolumeServerSe
 }
 
 func (v VolumeServerOptions) startPublicHttpService(handler http.Handler) httpdown.Server {
-	publicListeningAddress := *v.bindIp + ":" + strconv.Itoa(*v.publicPort)
+	publicListeningAddress := util.JoinHostPort(*v.bindIp, *v.publicPort)
 	glog.V(0).Infoln("Start Seaweed volume server", util.Version(), "public at", publicListeningAddress)
 	publicListener, e := util.NewListener(publicListeningAddress, time.Duration(*v.idleConnectionTimeout)*time.Second)
 	if e != nil {
@@ -351,7 +351,7 @@ func (v VolumeServerOptions) startClusterHttpService(handler http.Handler) httpd
 		keyFile = viper.GetString("https.volume.key")
 	}
 
-	listeningAddress := *v.bindIp + ":" + strconv.Itoa(*v.port)
+	listeningAddress := util.JoinHostPort(*v.bindIp, *v.port)
 	glog.V(0).Infof("Start Seaweed volume server %s at %s", util.Version(), listeningAddress)
 	listener, e := util.NewListener(listeningAddress, time.Duration(*v.idleConnectionTimeout)*time.Second)
 	if e != nil {
@@ -373,7 +373,7 @@ func (v VolumeServerOptions) startClusterHttpService(handler http.Handler) httpd
 }
 
 func (v VolumeServerOptions) startTcpService(volumeServer *weed_server.VolumeServer) {
-	listeningAddress := *v.bindIp + ":" + strconv.Itoa(*v.port+20000)
+	listeningAddress := util.JoinHostPort(*v.bindIp,*v.port+20000)
 	glog.V(0).Infoln("Start Seaweed volume server", util.Version(), "tcp at", listeningAddress)
 	listener, e := util.NewListener(listeningAddress, 0)
 	if e != nil {
diff --git a/weed/filer/etcd/etcd_store.go b/weed/filer/etcd/etcd_store.go
index 71ed738f9..2a5dfc926 100644
--- a/weed/filer/etcd/etcd_store.go
+++ b/weed/filer/etcd/etcd_store.go
@@ -7,7 +7,7 @@ import (
 	"strings"
 	"time"
 
-	"go.etcd.io/etcd/clientv3"
+	"go.etcd.io/etcd/client/v3"
 
 	"github.com/chrislusf/seaweedfs/weed/filer"
 	"github.com/chrislusf/seaweedfs/weed/glog"
diff --git a/weed/filer/filechunk_manifest.go b/weed/filer/filechunk_manifest.go
index 00dbf1fd6..32008271b 100644
--- a/weed/filer/filechunk_manifest.go
+++ b/weed/filer/filechunk_manifest.go
@@ -6,6 +6,8 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/wdclient"
 	"io"
 	"math"
+	"net/url"
+	"strings"
 	"time"
 
 	"github.com/golang/protobuf/proto"
@@ -108,6 +110,9 @@ func retriedFetchChunkData(urlStrings []string, cipherKey []byte, isGzipped bool
 	for waitTime := time.Second; waitTime < util.RetryWaitTime; waitTime += waitTime / 2 {
 		for _, urlString := range urlStrings {
 			receivedData = receivedData[:0]
+			if strings.Contains(urlString, "%") {
+				urlString = url.PathEscape(urlString)
+			}
 			shouldRetry, err = util.ReadUrlAsStream(urlString+"?readDeleted=true", cipherKey, isGzipped, isFullChunk, offset, size, func(data []byte) {
 				receivedData = append(receivedData, data...)
 			})
diff --git a/weed/filer/filer_notify_append.go b/weed/filer/filer_notify_append.go
index d441bbbc9..73762cde7 100644
--- a/weed/filer/filer_notify_append.go
+++ b/weed/filer/filer_notify_append.go
@@ -66,7 +66,16 @@ func (f *Filer) assignAndUpload(targetFile string, data []byte) (*operation.Assi
 
 	// upload data
 	targetUrl := "http://" + assignResult.Url + "/" + assignResult.Fid
-	uploadResult, err := operation.UploadData(targetUrl, "", f.Cipher, data, false, "", nil, assignResult.Auth)
+	uploadOption := &operation.UploadOption{
+		UploadUrl:         targetUrl,
+		Filename:          "",
+		Cipher:            f.Cipher,
+		IsInputCompressed: false,
+		MimeType:          "",
+		PairMap:           nil,
+		Jwt:               assignResult.Auth,
+	}
+	uploadResult, err := operation.UploadData(data, uploadOption)
 	if err != nil {
 		return nil, nil, fmt.Errorf("upload data %s: %v", targetUrl, err)
 	}
diff --git a/weed/filer/leveldb/leveldb_store.go b/weed/filer/leveldb/leveldb_store.go
index ce454f36a..9a7670d42 100644
--- a/weed/filer/leveldb/leveldb_store.go
+++ b/weed/filer/leveldb/leveldb_store.go
@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"github.com/syndtr/goleveldb/leveldb"
 	leveldb_errors "github.com/syndtr/goleveldb/leveldb/errors"
+	"github.com/syndtr/goleveldb/leveldb/filter"
 	"github.com/syndtr/goleveldb/leveldb/opt"
 	leveldb_util "github.com/syndtr/goleveldb/leveldb/util"
 	"os"
@@ -45,9 +46,9 @@ func (store *LevelDBStore) initialize(dir string) (err error) {
 	}
 
 	opts := &opt.Options{
-		BlockCacheCapacity:            32 * 1024 * 1024, // default value is 8MiB
-		WriteBuffer:                   16 * 1024 * 1024, // default value is 4MiB
-		CompactionTableSizeMultiplier: 10,
+		BlockCacheCapacity: 32 * 1024 * 1024,         // default value is 8MiB
+		WriteBuffer:        16 * 1024 * 1024,         // default value is 4MiB
+		Filter:             filter.NewBloomFilter(8), // false positive rate 0.02
 	}
 
 	if store.db, err = leveldb.OpenFile(dir, opts); err != nil {
diff --git a/weed/filer/leveldb2/leveldb2_store.go b/weed/filer/leveldb2/leveldb2_store.go
index 4c4409c4d..966686ed9 100644
--- a/weed/filer/leveldb2/leveldb2_store.go
+++ b/weed/filer/leveldb2/leveldb2_store.go
@@ -46,10 +46,9 @@ func (store *LevelDB2Store) initialize(dir string, dbCount int) (err error) {
 	}
 
 	opts := &opt.Options{
-		BlockCacheCapacity:            32 * 1024 * 1024, // default value is 8MiB
-		WriteBuffer:                   16 * 1024 * 1024, // default value is 4MiB
-		CompactionTableSizeMultiplier: 4,
-		Filter:                        filter.NewBloomFilter(8), // false positive rate 0.02
+		BlockCacheCapacity: 32 * 1024 * 1024,         // default value is 8MiB
+		WriteBuffer:        16 * 1024 * 1024,         // default value is 4MiB
+		Filter:             filter.NewBloomFilter(8), // false positive rate 0.02
 	}
 
 	for d := 0; d < dbCount; d++ {
diff --git a/weed/filer/leveldb3/leveldb3_store.go b/weed/filer/leveldb3/leveldb3_store.go
index bc57a6605..86e2b584b 100644
--- a/weed/filer/leveldb3/leveldb3_store.go
+++ b/weed/filer/leveldb3/leveldb3_store.go
@@ -66,17 +66,15 @@ func (store *LevelDB3Store) initialize(dir string) (err error) {
 func (store *LevelDB3Store) loadDB(name string) (*leveldb.DB, error) {
 	bloom := filter.NewBloomFilter(8) // false positive rate 0.02
 	opts := &opt.Options{
-		BlockCacheCapacity:            32 * 1024 * 1024, // default value is 8MiB
-		WriteBuffer:                   16 * 1024 * 1024, // default value is 4MiB
-		CompactionTableSizeMultiplier: 4,
-		Filter:                        bloom,
+		BlockCacheCapacity: 32 * 1024 * 1024, // default value is 8MiB
+		WriteBuffer:        16 * 1024 * 1024, // default value is 4MiB
+		Filter:             bloom,
 	}
 	if name != DEFAULT {
 		opts = &opt.Options{
-			BlockCacheCapacity:            4 * 1024 * 1024, // default value is 8MiB
-			WriteBuffer:                   2 * 1024 * 1024, // default value is 4MiB
-			CompactionTableSizeMultiplier: 4,
-			Filter:                        bloom,
+			BlockCacheCapacity: 4 * 1024 * 1024, // default value is 8MiB
+			WriteBuffer:        2 * 1024 * 1024, // default value is 4MiB
+			Filter:             bloom,
 		}
 	}
 
diff --git a/weed/filer/read_remote.go b/weed/filer/read_remote.go
index eee536ff6..58639024b 100644
--- a/weed/filer/read_remote.go
+++ b/weed/filer/read_remote.go
@@ -2,8 +2,8 @@ package filer
 
 import (
 	"context"
-	"fmt"
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/remote_pb"
 	"github.com/chrislusf/seaweedfs/weed/util"
 )
 
@@ -11,21 +11,8 @@ func (entry *Entry) IsInRemoteOnly() bool {
 	return len(entry.Chunks) == 0 && entry.Remote != nil && entry.Remote.RemoteSize > 0
 }
 
-func (f *Filer) ReadRemote(entry *Entry, offset int64, size int64) (data []byte, err error) {
-	client, _, found := f.RemoteStorage.GetRemoteStorageClient(entry.Remote.StorageName)
-	if !found {
-		return nil, fmt.Errorf("remote storage %v not found", entry.Remote.StorageName)
-	}
-
-	mountDir, remoteLoation := f.RemoteStorage.FindMountDirectory(entry.FullPath)
-
-	sourceLoc := MapFullPathToRemoteStorageLocation(mountDir, remoteLoation, entry.FullPath)
-
-	return client.ReadFile(sourceLoc, offset, size)
-}
-
-func MapFullPathToRemoteStorageLocation(localMountedDir util.FullPath, remoteMountedLocation *filer_pb.RemoteStorageLocation, fp util.FullPath) *filer_pb.RemoteStorageLocation {
-	remoteLocation := &filer_pb.RemoteStorageLocation{
+func MapFullPathToRemoteStorageLocation(localMountedDir util.FullPath, remoteMountedLocation *remote_pb.RemoteStorageLocation, fp util.FullPath) *remote_pb.RemoteStorageLocation {
+	remoteLocation := &remote_pb.RemoteStorageLocation{
 		Name:   remoteMountedLocation.Name,
 		Bucket: remoteMountedLocation.Bucket,
 		Path:   remoteMountedLocation.Path,
@@ -34,11 +21,11 @@ func MapFullPathToRemoteStorageLocation(localMountedDir util.FullPath, remoteMou
 	return remoteLocation
 }
 
-func MapRemoteStorageLocationPathToFullPath(localMountedDir util.FullPath, remoteMountedLocation *filer_pb.RemoteStorageLocation, remoteLocationPath string)(fp util.FullPath)  {
+func MapRemoteStorageLocationPathToFullPath(localMountedDir util.FullPath, remoteMountedLocation *remote_pb.RemoteStorageLocation, remoteLocationPath string) (fp util.FullPath) {
 	return localMountedDir.Child(remoteLocationPath[len(remoteMountedLocation.Path):])
 }
 
-func DownloadToLocal(filerClient filer_pb.FilerClient, remoteConf *filer_pb.RemoteConf, remoteLocation *filer_pb.RemoteStorageLocation, parent util.FullPath, entry *filer_pb.Entry) error {
+func DownloadToLocal(filerClient filer_pb.FilerClient, remoteConf *remote_pb.RemoteConf, remoteLocation *remote_pb.RemoteStorageLocation, parent util.FullPath, entry *filer_pb.Entry) error {
 	return filerClient.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
 		_, err := client.DownloadToLocal(context.Background(), &filer_pb.DownloadToLocalRequest{
 			Directory: string(parent),
diff --git a/weed/filer/remote_mapping.go b/weed/filer/remote_mapping.go
new file mode 100644
index 000000000..fb74dca98
--- /dev/null
+++ b/weed/filer/remote_mapping.go
@@ -0,0 +1,121 @@
+package filer
+
+import (
+	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/remote_pb"
+	"github.com/golang/protobuf/proto"
+	"google.golang.org/grpc"
+)
+
+func ReadMountMappings(grpcDialOption grpc.DialOption, filerAddress string) (mappings *remote_pb.RemoteStorageMapping, readErr error) {
+	var oldContent []byte
+	if readErr = pb.WithFilerClient(filerAddress, grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
+		oldContent, readErr = ReadInsideFiler(client, DirectoryEtcRemote, REMOTE_STORAGE_MOUNT_FILE)
+		return readErr
+	}); readErr != nil {
+		return nil, readErr
+	}
+
+	mappings, readErr = UnmarshalRemoteStorageMappings(oldContent)
+	if readErr != nil {
+		return nil, fmt.Errorf("unmarshal mappings: %v", readErr)
+	}
+
+	return
+}
+
+func InsertMountMapping(filerClient filer_pb.FilerClient, dir string, remoteStorageLocation *remote_pb.RemoteStorageLocation) (err error) {
+
+	// read current mapping
+	var oldContent, newContent []byte
+	err = filerClient.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
+		oldContent, err = ReadInsideFiler(client, DirectoryEtcRemote, REMOTE_STORAGE_MOUNT_FILE)
+		return err
+	})
+	if err != nil {
+		if err != filer_pb.ErrNotFound {
+			return fmt.Errorf("read existing mapping: %v", err)
+		}
+	}
+
+	// add new mapping
+	newContent, err = addRemoteStorageMapping(oldContent, dir, remoteStorageLocation)
+	if err != nil {
+		return fmt.Errorf("add mapping %s~%s: %v", dir, remoteStorageLocation, err)
+	}
+
+	// save back
+	err = filerClient.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
+		return SaveInsideFiler(client, DirectoryEtcRemote, REMOTE_STORAGE_MOUNT_FILE, newContent)
+	})
+	if err != nil {
+		return fmt.Errorf("save mapping: %v", err)
+	}
+
+	return nil
+}
+
+func DeleteMountMapping(filerClient filer_pb.FilerClient, dir string) (err error) {
+
+	// read current mapping
+	var oldContent, newContent []byte
+	err = filerClient.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
+		oldContent, err = ReadInsideFiler(client, DirectoryEtcRemote, REMOTE_STORAGE_MOUNT_FILE)
+		return err
+	})
+	if err != nil {
+		if err != filer_pb.ErrNotFound {
+			return fmt.Errorf("read existing mapping: %v", err)
+		}
+	}
+
+	// add new mapping
+	newContent, err = removeRemoteStorageMapping(oldContent, dir)
+	if err != nil {
+		return fmt.Errorf("delete mount %s: %v", dir, err)
+	}
+
+	// save back
+	err = filerClient.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
+		return SaveInsideFiler(client, DirectoryEtcRemote, REMOTE_STORAGE_MOUNT_FILE, newContent)
+	})
+	if err != nil {
+		return fmt.Errorf("save mapping: %v", err)
+	}
+
+	return nil
+}
+
+func addRemoteStorageMapping(oldContent []byte, dir string, storageLocation *remote_pb.RemoteStorageLocation) (newContent []byte, err error) {
+	mappings, unmarshalErr := UnmarshalRemoteStorageMappings(oldContent)
+	if unmarshalErr != nil {
+		// skip
+	}
+
+	// set the new mapping
+	mappings.Mappings[dir] = storageLocation
+
+	if newContent, err = proto.Marshal(mappings); err != nil {
+		return oldContent, fmt.Errorf("marshal mappings: %v", err)
+	}
+
+	return
+}
+
+func removeRemoteStorageMapping(oldContent []byte, dir string) (newContent []byte, err error) {
+	mappings, unmarshalErr := UnmarshalRemoteStorageMappings(oldContent)
+	if unmarshalErr != nil {
+		return nil, unmarshalErr
+	}
+
+	// set the new mapping
+	delete(mappings.Mappings, dir)
+
+	if newContent, err = proto.Marshal(mappings); err != nil {
+		return oldContent, fmt.Errorf("marshal mappings: %v", err)
+	}
+
+	return
+}
diff --git a/weed/filer/filer_remote_storage.go b/weed/filer/remote_storage.go
index 99ea1d3bb..4ff21f3b3 100644
--- a/weed/filer/filer_remote_storage.go
+++ b/weed/filer/remote_storage.go
@@ -4,6 +4,7 @@ import (
 	"context"
 	"fmt"
 	"github.com/chrislusf/seaweedfs/weed/pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/remote_pb"
 	"github.com/chrislusf/seaweedfs/weed/remote_storage"
 	"github.com/chrislusf/seaweedfs/weed/util"
 	"github.com/golang/protobuf/proto"
@@ -21,13 +22,13 @@ const REMOTE_STORAGE_MOUNT_FILE = "mount.mapping"
 
 type FilerRemoteStorage struct {
 	rules             ptrie.Trie
-	storageNameToConf map[string]*filer_pb.RemoteConf
+	storageNameToConf map[string]*remote_pb.RemoteConf
 }
 
 func NewFilerRemoteStorage() (rs *FilerRemoteStorage) {
 	rs = &FilerRemoteStorage{
 		rules:             ptrie.New(),
-		storageNameToConf: make(map[string]*filer_pb.RemoteConf),
+		storageNameToConf: make(map[string]*remote_pb.RemoteConf),
 	}
 	return rs
 }
@@ -56,7 +57,7 @@ func (rs *FilerRemoteStorage) LoadRemoteStorageConfigurationsAndMapping(filer *F
 		if !strings.HasSuffix(entry.Name(), REMOTE_STORAGE_CONF_SUFFIX) {
 			return nil
 		}
-		conf := &filer_pb.RemoteConf{}
+		conf := &remote_pb.RemoteConf{}
 		if err := proto.Unmarshal(entry.Content, conf); err != nil {
 			return fmt.Errorf("unmarshal %s/%s: %v", DirectoryEtcRemote, entry.Name(), err)
 		}
@@ -66,7 +67,7 @@ func (rs *FilerRemoteStorage) LoadRemoteStorageConfigurationsAndMapping(filer *F
 }
 
 func (rs *FilerRemoteStorage) loadRemoteStorageMountMapping(data []byte) (err error) {
-	mappings := &filer_pb.RemoteStorageMapping{}
+	mappings := &remote_pb.RemoteStorageMapping{}
 	if err := proto.Unmarshal(data, mappings); err != nil {
 		return fmt.Errorf("unmarshal %s/%s: %v", DirectoryEtcRemote, REMOTE_STORAGE_MOUNT_FILE, err)
 	}
@@ -76,23 +77,23 @@ func (rs *FilerRemoteStorage) loadRemoteStorageMountMapping(data []byte) (err er
 	return nil
 }
 
-func (rs *FilerRemoteStorage) mapDirectoryToRemoteStorage(dir util.FullPath, loc *filer_pb.RemoteStorageLocation) {
+func (rs *FilerRemoteStorage) mapDirectoryToRemoteStorage(dir util.FullPath, loc *remote_pb.RemoteStorageLocation) {
 	rs.rules.Put([]byte(dir+"/"), loc)
 }
 
-func (rs *FilerRemoteStorage) FindMountDirectory(p util.FullPath) (mountDir util.FullPath, remoteLocation *filer_pb.RemoteStorageLocation) {
+func (rs *FilerRemoteStorage) FindMountDirectory(p util.FullPath) (mountDir util.FullPath, remoteLocation *remote_pb.RemoteStorageLocation) {
 	rs.rules.MatchPrefix([]byte(p), func(key []byte, value interface{}) bool {
 		mountDir = util.FullPath(string(key[:len(key)-1]))
-		remoteLocation = value.(*filer_pb.RemoteStorageLocation)
+		remoteLocation = value.(*remote_pb.RemoteStorageLocation)
 		return true
 	})
 	return
 }
 
-func (rs *FilerRemoteStorage) FindRemoteStorageClient(p util.FullPath) (client remote_storage.RemoteStorageClient, remoteConf *filer_pb.RemoteConf, found bool) {
-	var storageLocation *filer_pb.RemoteStorageLocation
+func (rs *FilerRemoteStorage) FindRemoteStorageClient(p util.FullPath) (client remote_storage.RemoteStorageClient, remoteConf *remote_pb.RemoteConf, found bool) {
+	var storageLocation *remote_pb.RemoteStorageLocation
 	rs.rules.MatchPrefix([]byte(p), func(key []byte, value interface{}) bool {
-		storageLocation = value.(*filer_pb.RemoteStorageLocation)
+		storageLocation = value.(*remote_pb.RemoteStorageLocation)
 		return true
 	})
 
@@ -104,7 +105,7 @@ func (rs *FilerRemoteStorage) FindRemoteStorageClient(p util.FullPath) (client r
 	return rs.GetRemoteStorageClient(storageLocation.Name)
 }
 
-func (rs *FilerRemoteStorage) GetRemoteStorageClient(storageName string) (client remote_storage.RemoteStorageClient, remoteConf *filer_pb.RemoteConf, found bool) {
+func (rs *FilerRemoteStorage) GetRemoteStorageClient(storageName string) (client remote_storage.RemoteStorageClient, remoteConf *remote_pb.RemoteConf, found bool) {
 	remoteConf, found = rs.storageNameToConf[storageName]
 	if !found {
 		return
@@ -118,9 +119,9 @@ func (rs *FilerRemoteStorage) GetRemoteStorageClient(storageName string) (client
 	return
 }
 
-func UnmarshalRemoteStorageMappings(oldContent []byte) (mappings *filer_pb.RemoteStorageMapping, err error) {
-	mappings = &filer_pb.RemoteStorageMapping{
-		Mappings: make(map[string]*filer_pb.RemoteStorageLocation),
+func UnmarshalRemoteStorageMappings(oldContent []byte) (mappings *remote_pb.RemoteStorageMapping, err error) {
+	mappings = &remote_pb.RemoteStorageMapping{
+		Mappings: make(map[string]*remote_pb.RemoteStorageLocation),
 	}
 	if len(oldContent) > 0 {
 		if err = proto.Unmarshal(oldContent, mappings); err != nil {
@@ -130,70 +131,51 @@ func UnmarshalRemoteStorageMappings(oldContent []byte) (mappings *filer_pb.Remot
 	return
 }
 
-func AddRemoteStorageMapping(oldContent []byte, dir string, storageLocation *filer_pb.RemoteStorageLocation) (newContent []byte, err error) {
-	mappings, unmarshalErr := UnmarshalRemoteStorageMappings(oldContent)
-	if unmarshalErr != nil {
-		// skip
-	}
-
-	// set the new mapping
-	mappings.Mappings[dir] = storageLocation
-
-	if newContent, err = proto.Marshal(mappings); err != nil {
-		return oldContent, fmt.Errorf("marshal mappings: %v", err)
-	}
-
-	return
-}
-
-func RemoveRemoteStorageMapping(oldContent []byte, dir string) (newContent []byte, err error) {
-	mappings, unmarshalErr := UnmarshalRemoteStorageMappings(oldContent)
-	if unmarshalErr != nil {
-		return nil, unmarshalErr
-	}
-
-	// set the new mapping
-	delete(mappings.Mappings, dir)
-
-	if newContent, err = proto.Marshal(mappings); err != nil {
-		return oldContent, fmt.Errorf("marshal mappings: %v", err)
-	}
-
-	return
-}
-
-func ReadMountMappings(grpcDialOption grpc.DialOption, filerAddress string) (mappings *filer_pb.RemoteStorageMapping, readErr error) {
+func ReadRemoteStorageConf(grpcDialOption grpc.DialOption, filerAddress string, storageName string) (conf *remote_pb.RemoteConf, readErr error) {
 	var oldContent []byte
 	if readErr = pb.WithFilerClient(filerAddress, grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
-		oldContent, readErr = ReadInsideFiler(client, DirectoryEtcRemote, REMOTE_STORAGE_MOUNT_FILE)
+		oldContent, readErr = ReadInsideFiler(client, DirectoryEtcRemote, storageName+REMOTE_STORAGE_CONF_SUFFIX)
 		return readErr
 	}); readErr != nil {
 		return nil, readErr
 	}
 
-	mappings, readErr = UnmarshalRemoteStorageMappings(oldContent)
-	if readErr != nil {
-		return nil, fmt.Errorf("unmarshal mappings: %v", readErr)
+	// unmarshal storage configuration
+	conf = &remote_pb.RemoteConf{}
+	if unMarshalErr := proto.Unmarshal(oldContent, conf); unMarshalErr != nil {
+		readErr = fmt.Errorf("unmarshal %s/%s: %v", DirectoryEtcRemote, storageName+REMOTE_STORAGE_CONF_SUFFIX, unMarshalErr)
+		return
 	}
 
 	return
 }
 
-func ReadRemoteStorageConf(grpcDialOption grpc.DialOption, filerAddress string, storageName string) (conf *filer_pb.RemoteConf, readErr error) {
-	var oldContent []byte
-	if readErr = pb.WithFilerClient(filerAddress, grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
-		oldContent, readErr = ReadInsideFiler(client, DirectoryEtcRemote, storageName+REMOTE_STORAGE_CONF_SUFFIX)
-		return readErr
-	}); readErr != nil {
-		return nil, readErr
+func DetectMountInfo(grpcDialOption grpc.DialOption, filerAddress string, dir string) (*remote_pb.RemoteStorageMapping, string, *remote_pb.RemoteStorageLocation, *remote_pb.RemoteConf, error) {
+
+	mappings, listErr := ReadMountMappings(grpcDialOption, filerAddress)
+	if listErr != nil {
+		return nil, "", nil, nil, listErr
+	}
+	if dir == "" {
+		return mappings, "", nil, nil, fmt.Errorf("need to specify '-dir' option")
 	}
 
-	// unmarshal storage configuration
-	conf = &filer_pb.RemoteConf{}
-	if unMarshalErr := proto.Unmarshal(oldContent, conf); unMarshalErr != nil {
-		readErr = fmt.Errorf("unmarshal %s/%s: %v", DirectoryEtcRemote, storageName+REMOTE_STORAGE_CONF_SUFFIX, unMarshalErr)
-		return
+	var localMountedDir string
+	var remoteStorageMountedLocation *remote_pb.RemoteStorageLocation
+	for k, loc := range mappings.Mappings {
+		if strings.HasPrefix(dir, k) {
+			localMountedDir, remoteStorageMountedLocation = k, loc
+		}
+	}
+	if localMountedDir == "" {
+		return mappings, localMountedDir, remoteStorageMountedLocation, nil, fmt.Errorf("%s is not mounted", dir)
 	}
 
-	return
+	// find remote storage configuration
+	remoteStorageConf, err := ReadRemoteStorageConf(grpcDialOption, filerAddress, remoteStorageMountedLocation.Name)
+	if err != nil {
+		return mappings, localMountedDir, remoteStorageMountedLocation, remoteStorageConf, err
+	}
+
+	return mappings, localMountedDir, remoteStorageMountedLocation, remoteStorageConf, nil
 }
diff --git a/weed/filer/filer_remote_storage_test.go b/weed/filer/remote_storage_test.go
index 35ffc7538..9f4d7af2f 100644
--- a/weed/filer/filer_remote_storage_test.go
+++ b/weed/filer/remote_storage_test.go
@@ -1,20 +1,20 @@
 package filer
 
 import (
-	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/remote_pb"
 	"github.com/stretchr/testify/assert"
 	"testing"
 )
 
 func TestFilerRemoteStorage_FindRemoteStorageClient(t *testing.T) {
-	conf := &filer_pb.RemoteConf{
+	conf := &remote_pb.RemoteConf{
 		Name: "s7",
 		Type: "s3",
 	}
 	rs := NewFilerRemoteStorage()
 	rs.storageNameToConf[conf.Name] = conf
 
-	rs.mapDirectoryToRemoteStorage("/a/b/c", &filer_pb.RemoteStorageLocation{
+	rs.mapDirectoryToRemoteStorage("/a/b/c", &remote_pb.RemoteStorageLocation{
 		Name:   "s7",
 		Bucket: "some",
 		Path:   "/dir",
diff --git a/weed/filer/sqlite/sqlite_store.go b/weed/filer/sqlite/sqlite_store.go
index 6b055e53c..ca9d38786 100644
--- a/weed/filer/sqlite/sqlite_store.go
+++ b/weed/filer/sqlite/sqlite_store.go
@@ -1,3 +1,4 @@
+//go:build linux || darwin || windows
 // +build linux darwin windows
 
 // limited GOOS due to modernc.org/libc/unistd
diff --git a/weed/filer/sqlite/sqlite_store_unsupported.go b/weed/filer/sqlite/sqlite_store_unsupported.go
index 803c71afa..0fba1ea33 100644
--- a/weed/filer/sqlite/sqlite_store_unsupported.go
+++ b/weed/filer/sqlite/sqlite_store_unsupported.go
@@ -1,3 +1,4 @@
+//go:build !linux && !darwin && !windows && !s390 && !ppc64le && !mips64
 // +build !linux,!darwin,!windows,!s390,!ppc64le,!mips64
 
 // limited GOOS due to modernc.org/libc/unistd
diff --git a/weed/filer/stream.go b/weed/filer/stream.go
index c61ee3c12..4a70d118e 100644
--- a/weed/filer/stream.go
+++ b/weed/filer/stream.go
@@ -7,6 +7,7 @@ import (
 	"math"
 	"sort"
 	"strings"
+	"sync"
 	"time"
 
 	"github.com/chrislusf/seaweedfs/weed/glog"
@@ -16,6 +17,49 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/wdclient"
 )
 
+func HasData(entry *filer_pb.Entry) bool {
+
+	if len(entry.Content) > 0 {
+		return true
+	}
+
+	return len(entry.Chunks) > 0
+}
+
+func IsSameData(a, b *filer_pb.Entry) bool {
+
+	if len(a.Content) > 0 || len(b.Content) > 0 {
+		return bytes.Equal(a.Content, b.Content)
+	}
+
+	return isSameChunks(a.Chunks, b.Chunks)
+}
+
+func isSameChunks(a, b []*filer_pb.FileChunk) bool {
+	if len(a) != len(b) {
+		return false
+	}
+	sort.Slice(a, func(i, j int) bool {
+		return strings.Compare(a[i].ETag, a[j].ETag) < 0
+	})
+	sort.Slice(b, func(i, j int) bool {
+		return strings.Compare(b[i].ETag, b[j].ETag) < 0
+	})
+	for i := 0; i < len(a); i++ {
+		if a[i].ETag != b[i].ETag {
+			return false
+		}
+	}
+	return true
+}
+
+func NewFileReader(filerClient filer_pb.FilerClient, entry *filer_pb.Entry) io.Reader {
+	if len(entry.Content) > 0 {
+		return bytes.NewReader(entry.Content)
+	}
+	return NewChunkStreamReader(filerClient, entry.Chunks)
+}
+
 func StreamContent(masterClient wdclient.HasLookupFileIdFunction, writer io.Writer, chunks []*filer_pb.FileChunk, offset int64, size int64) error {
 
 	glog.V(9).Infof("start to stream content for chunks: %+v\n", chunks)
@@ -83,14 +127,14 @@ func ReadAll(masterClient *wdclient.MasterClient, chunks []*filer_pb.FileChunk)
 
 // ----------------  ChunkStreamReader ----------------------------------
 type ChunkStreamReader struct {
-	chunkViews         []*ChunkView
-	totalSize          int64
-	logicOffset        int64
-	buffer             []byte
-	bufferOffset       int64
-	bufferPos          int
-	nextChunkViewIndex int
-	lookupFileId       wdclient.LookupFileIdFunctionType
+	chunkViews   []*ChunkView
+	totalSize    int64
+	logicOffset  int64
+	buffer       []byte
+	bufferOffset int64
+	bufferLock   sync.Mutex
+	chunk        string
+	lookupFileId wdclient.LookupFileIdFunctionType
 }
 
 var _ = io.ReadSeeker(&ChunkStreamReader{})
@@ -132,26 +176,29 @@ func NewChunkStreamReader(filerClient filer_pb.FilerClient, chunks []*filer_pb.F
 }
 
 func (c *ChunkStreamReader) ReadAt(p []byte, off int64) (n int, err error) {
-	if err = c.prepareBufferFor(c.logicOffset); err != nil {
+	c.bufferLock.Lock()
+	defer c.bufferLock.Unlock()
+	if err = c.prepareBufferFor(off); err != nil {
 		return
 	}
-	return c.Read(p)
+	c.logicOffset = off
+	return c.doRead(p)
 }
 
 func (c *ChunkStreamReader) Read(p []byte) (n int, err error) {
+	c.bufferLock.Lock()
+	defer c.bufferLock.Unlock()
+	return c.doRead(p)
+}
+
+func (c *ChunkStreamReader) doRead(p []byte) (n int, err error) {
+	// fmt.Printf("do read [%d,%d) at %s[%d,%d)\n", c.logicOffset, c.logicOffset+int64(len(p)), c.chunk, c.bufferOffset, c.bufferOffset+int64(len(c.buffer)))
 	for n < len(p) {
-		if c.isBufferEmpty() {
-			if c.nextChunkViewIndex >= len(c.chunkViews) {
-				return n, io.EOF
-			}
-			chunkView := c.chunkViews[c.nextChunkViewIndex]
-			if err = c.fetchChunkToBuffer(chunkView); err != nil {
-				return
-			}
-			c.nextChunkViewIndex++
+		// println("read", c.logicOffset)
+		if err = c.prepareBufferFor(c.logicOffset); err != nil {
+			return
 		}
-		t := copy(p[n:], c.buffer[c.bufferPos:])
-		c.bufferPos += t
+		t := copy(p[n:], c.buffer[c.logicOffset-c.bufferOffset:])
 		n += t
 		c.logicOffset += int64(t)
 	}
@@ -159,10 +206,12 @@ func (c *ChunkStreamReader) Read(p []byte) (n int, err error) {
 }
 
 func (c *ChunkStreamReader) isBufferEmpty() bool {
-	return len(c.buffer) <= c.bufferPos
+	return len(c.buffer) <= int(c.logicOffset-c.bufferOffset)
 }
 
 func (c *ChunkStreamReader) Seek(offset int64, whence int) (int64, error) {
+	c.bufferLock.Lock()
+	defer c.bufferLock.Unlock()
 
 	var err error
 	switch whence {
@@ -182,33 +231,59 @@ func (c *ChunkStreamReader) Seek(offset int64, whence int) (int64, error) {
 
 }
 
+func insideChunk(offset int64, chunk *ChunkView) bool {
+	return chunk.LogicOffset <= offset && offset < chunk.LogicOffset+int64(chunk.Size)
+}
+
 func (c *ChunkStreamReader) prepareBufferFor(offset int64) (err error) {
 	// stay in the same chunk
-	if !c.isBufferEmpty() {
-		if c.bufferOffset <= offset && offset < c.bufferOffset+int64(len(c.buffer)) {
-			c.bufferPos = int(offset - c.bufferOffset)
-			return nil
-		}
+	if c.bufferOffset <= offset && offset < c.bufferOffset+int64(len(c.buffer)) {
+		return nil
 	}
 
+	// fmt.Printf("fetch for offset %d\n", offset)
+
 	// need to seek to a different chunk
 	currentChunkIndex := sort.Search(len(c.chunkViews), func(i int) bool {
-		return c.chunkViews[i].LogicOffset <= offset
+		return offset < c.chunkViews[i].LogicOffset
 	})
 	if currentChunkIndex == len(c.chunkViews) {
-		return io.EOF
+		// not found
+		if insideChunk(offset, c.chunkViews[0]) {
+			// fmt.Printf("select0 chunk %d %s\n", currentChunkIndex, c.chunkViews[currentChunkIndex].FileId)
+			currentChunkIndex = 0
+		} else if insideChunk(offset, c.chunkViews[len(c.chunkViews)-1]) {
+			currentChunkIndex = len(c.chunkViews) - 1
+			// fmt.Printf("select last chunk %d %s\n", currentChunkIndex, c.chunkViews[currentChunkIndex].FileId)
+		} else {
+			return io.EOF
+		}
+	} else if currentChunkIndex > 0 {
+		if insideChunk(offset, c.chunkViews[currentChunkIndex]) {
+			// good hit
+		} else if insideChunk(offset, c.chunkViews[currentChunkIndex-1]) {
+			currentChunkIndex -= 1
+			// fmt.Printf("select -1 chunk %d %s\n", currentChunkIndex, c.chunkViews[currentChunkIndex].FileId)
+		} else {
+			// glog.Fatalf("unexpected1 offset %d", offset)
+			return fmt.Errorf("unexpected1 offset %d", offset)
+		}
+	} else {
+		// glog.Fatalf("unexpected2 offset %d", offset)
+		return fmt.Errorf("unexpected2 offset %d", offset)
 	}
 
 	// positioning within the new chunk
 	chunk := c.chunkViews[currentChunkIndex]
-	if chunk.LogicOffset <= offset && offset < chunk.LogicOffset+int64(chunk.Size) {
+	if insideChunk(offset, chunk) {
 		if c.isBufferEmpty() || c.bufferOffset != chunk.LogicOffset {
 			if err = c.fetchChunkToBuffer(chunk); err != nil {
 				return
 			}
-			c.nextChunkViewIndex = currentChunkIndex + 1
 		}
-		c.bufferPos = int(offset - c.bufferOffset)
+	} else {
+		// glog.Fatalf("unexpected3 offset %d in %s [%d,%d)", offset, chunk.FileId, chunk.LogicOffset, chunk.LogicOffset+int64(chunk.Size))
+		return fmt.Errorf("unexpected3 offset %d in %s [%d,%d)", offset, chunk.FileId, chunk.LogicOffset, chunk.LogicOffset+int64(chunk.Size))
 	}
 	return
 }
@@ -239,10 +314,10 @@ func (c *ChunkStreamReader) fetchChunkToBuffer(chunkView *ChunkView) error {
 		return err
 	}
 	c.buffer = buffer.Bytes()
-	c.bufferPos = 0
 	c.bufferOffset = chunkView.LogicOffset
+	c.chunk = chunkView.FileId
 
-	// glog.V(0).Infof("read %s [%d,%d)", chunkView.FileId, chunkView.LogicOffset, chunkView.LogicOffset+int64(chunkView.Size))
+	// glog.V(0).Infof("fetched %s [%d,%d)", chunkView.FileId, chunkView.LogicOffset, chunkView.LogicOffset+int64(chunkView.Size))
 
 	return nil
 }
diff --git a/weed/filer/tikv/tikv.go b/weed/filer/tikv/tikv.go
new file mode 100644
index 000000000..8bb5dc577
--- /dev/null
+++ b/weed/filer/tikv/tikv.go
@@ -0,0 +1,5 @@
+package tikv
+
+/*
+ * This empty file is let go build can work without tikv tag
+ */
diff --git a/weed/filer/tikv/tikv_store.go b/weed/filer/tikv/tikv_store.go
new file mode 100644
index 000000000..561f23910
--- /dev/null
+++ b/weed/filer/tikv/tikv_store.go
@@ -0,0 +1,389 @@
+//go:build tikv
+// +build tikv
+
+package tikv
+
+import (
+	"bytes"
+	"context"
+	"crypto/sha1"
+	"fmt"
+	"io"
+	"strings"
+
+	"github.com/chrislusf/seaweedfs/weed/filer"
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/util"
+	"github.com/tikv/client-go/v2/tikv"
+	"github.com/tikv/client-go/v2/txnkv"
+)
+
+var (
+	_ filer.FilerStore = ((*TikvStore)(nil))
+)
+
+func init() {
+	filer.Stores = append(filer.Stores, &TikvStore{})
+}
+
+type TikvStore struct {
+	client                 *tikv.KVStore
+	deleteRangeConcurrency int
+}
+
+// Basic APIs
+func (store *TikvStore) GetName() string {
+	return "tikv"
+}
+
+func (store *TikvStore) Initialize(config util.Configuration, prefix string) error {
+	pdAddrs := []string{}
+	pdAddrsStr := config.GetString(prefix + "pdaddrs")
+	for _, item := range strings.Split(pdAddrsStr, ",") {
+		pdAddrs = append(pdAddrs, strings.TrimSpace(item))
+	}
+	drc := config.GetInt(prefix + "deleterange_concurrency")
+	if drc <= 0 {
+		drc = 1
+	}
+	store.deleteRangeConcurrency = drc
+	return store.initialize(pdAddrs)
+}
+
+func (store *TikvStore) initialize(pdAddrs []string) error {
+	client, err := tikv.NewTxnClient(pdAddrs)
+	store.client = client
+	return err
+}
+
+func (store *TikvStore) Shutdown() {
+	err := store.client.Close()
+	if err != nil {
+		glog.V(0).Infof("Shutdown TiKV client got error: %v", err)
+	}
+}
+
+// ~ Basic APIs
+
+// Entry APIs
+func (store *TikvStore) InsertEntry(ctx context.Context, entry *filer.Entry) error {
+	dir, name := entry.DirAndName()
+	key := generateKey(dir, name)
+
+	value, err := entry.EncodeAttributesAndChunks()
+	if err != nil {
+		return fmt.Errorf("encoding %s %+v: %v", entry.FullPath, entry.Attr, err)
+	}
+	txn, err := store.getTxn(ctx)
+	if err != nil {
+		return err
+	}
+	err = txn.RunInTxn(func(txn *txnkv.KVTxn) error {
+		return txn.Set(key, value)
+	})
+	if err != nil {
+		return fmt.Errorf("persisting %s : %v", entry.FullPath, err)
+	}
+	return nil
+}
+
+func (store *TikvStore) UpdateEntry(ctx context.Context, entry *filer.Entry) error {
+	return store.InsertEntry(ctx, entry)
+}
+
+func (store *TikvStore) FindEntry(ctx context.Context, path util.FullPath) (*filer.Entry, error) {
+	dir, name := path.DirAndName()
+	key := generateKey(dir, name)
+
+	txn, err := store.getTxn(ctx)
+	if err != nil {
+		return nil, err
+	}
+	var value []byte = nil
+	err = txn.RunInTxn(func(txn *txnkv.KVTxn) error {
+		val, err := txn.Get(context.TODO(), key)
+		if err == nil {
+			value = val
+		}
+		return err
+	})
+
+	if isNotExists(err) || value == nil {
+		return nil, filer_pb.ErrNotFound
+	}
+
+	if err != nil {
+		return nil, fmt.Errorf("get %s : %v", path, err)
+	}
+
+	entry := &filer.Entry{
+		FullPath: path,
+	}
+	err = entry.DecodeAttributesAndChunks(value)
+	if err != nil {
+		return entry, fmt.Errorf("decode %s : %v", entry.FullPath, err)
+	}
+	return entry, nil
+}
+
+func (store *TikvStore) DeleteEntry(ctx context.Context, path util.FullPath) error {
+	dir, name := path.DirAndName()
+	key := generateKey(dir, name)
+
+	txn, err := store.getTxn(ctx)
+	if err != nil {
+		return err
+	}
+
+	err = txn.RunInTxn(func(txn *txnkv.KVTxn) error {
+		return txn.Delete(key)
+	})
+	if err != nil {
+		return fmt.Errorf("delete %s : %v", path, err)
+	}
+	return nil
+}
+
+// ~ Entry APIs
+
+// Directory APIs
+func (store *TikvStore) DeleteFolderChildren(ctx context.Context, path util.FullPath) error {
+	directoryPrefix := genDirectoryKeyPrefix(path, "")
+
+	txn, err := store.getTxn(ctx)
+	if err != nil {
+		return err
+	}
+	var (
+		startKey []byte = nil
+		endKey   []byte = nil
+	)
+	err = txn.RunInTxn(func(txn *txnkv.KVTxn) error {
+		iter, err := txn.Iter(directoryPrefix, nil)
+		if err != nil {
+			return err
+		}
+		defer iter.Close()
+		for iter.Valid() {
+			key := iter.Key()
+			endKey = key
+			if !bytes.HasPrefix(key, directoryPrefix) {
+				break
+			}
+			if startKey == nil {
+				startKey = key
+			}
+
+			err = iter.Next()
+			if err != nil {
+				return err
+			}
+		}
+		// Only one Key matched just delete it.
+		if startKey != nil && bytes.Equal(startKey, endKey) {
+			return txn.Delete(startKey)
+		}
+		return nil
+	})
+	if err != nil {
+		return fmt.Errorf("delete %s : %v", path, err)
+	}
+
+	if startKey != nil && endKey != nil && !bytes.Equal(startKey, endKey) {
+		// has startKey and endKey and they are not equals, so use delete range
+		_, err = store.client.DeleteRange(context.Background(), startKey, endKey, store.deleteRangeConcurrency)
+		if err != nil {
+			return fmt.Errorf("delete %s : %v", path, err)
+		}
+	}
+	return err
+}
+
+func (store *TikvStore) ListDirectoryEntries(ctx context.Context, dirPath util.FullPath, startFileName string, includeStartFile bool, limit int64, eachEntryFunc filer.ListEachEntryFunc) (string, error) {
+	return store.ListDirectoryPrefixedEntries(ctx, dirPath, startFileName, includeStartFile, limit, "", eachEntryFunc)
+}
+
+func (store *TikvStore) ListDirectoryPrefixedEntries(ctx context.Context, dirPath util.FullPath, startFileName string, includeStartFile bool, limit int64, prefix string, eachEntryFunc filer.ListEachEntryFunc) (string, error) {
+	lastFileName := ""
+	directoryPrefix := genDirectoryKeyPrefix(dirPath, prefix)
+	lastFileStart := directoryPrefix
+	if startFileName != "" {
+		lastFileStart = genDirectoryKeyPrefix(dirPath, startFileName)
+	}
+
+	txn, err := store.getTxn(ctx)
+	if err != nil {
+		return lastFileName, err
+	}
+	err = txn.RunInTxn(func(txn *txnkv.KVTxn) error {
+		iter, err := txn.Iter(lastFileStart, nil)
+		if err != nil {
+			return err
+		}
+		defer iter.Close()
+		i := int64(0)
+		first := true
+		for iter.Valid() {
+			if first {
+				first = false
+				if !includeStartFile {
+					if iter.Valid() {
+						// Check first item is lastFileStart
+						if bytes.Equal(iter.Key(), lastFileStart) {
+							// Is lastFileStart and not include start file, just
+							// ignore it.
+							err = iter.Next()
+							if err != nil {
+								return err
+							}
+							continue
+						}
+					}
+				}
+			}
+			// Check for limitation
+			if limit > 0 {
+				i++
+				if i > limit {
+					break
+				}
+			}
+			// Validate key prefix
+			key := iter.Key()
+			if !bytes.HasPrefix(key, directoryPrefix) {
+				break
+			}
+			value := iter.Value()
+
+			// Start process
+			fileName := getNameFromKey(key)
+			if fileName != "" {
+				// Got file name, then generate the Entry
+				entry := &filer.Entry{
+					FullPath: util.NewFullPath(string(dirPath), fileName),
+				}
+				// Update lastFileName
+				lastFileName = fileName
+				// Check for decode value.
+				if decodeErr := entry.DecodeAttributesAndChunks(value); decodeErr != nil {
+					// Got error just return the error
+					glog.V(0).Infof("list %s : %v", entry.FullPath, err)
+					return err
+				}
+				// Run for each callback if return false just break the iteration
+				if !eachEntryFunc(entry) {
+					break
+				}
+			}
+			// End process
+
+			err = iter.Next()
+			if err != nil {
+				return err
+			}
+		}
+		return nil
+	})
+	if err != nil {
+		return lastFileName, fmt.Errorf("prefix list %s : %v", dirPath, err)
+	}
+	return lastFileName, nil
+}
+
+// ~ Directory APIs
+
+// Transaction Related APIs
+func (store *TikvStore) BeginTransaction(ctx context.Context) (context.Context, error) {
+	tx, err := store.client.Begin()
+	if err != nil {
+		return ctx, err
+	}
+	return context.WithValue(ctx, "tx", tx), nil
+}
+
+func (store *TikvStore) CommitTransaction(ctx context.Context) error {
+	if tx, ok := ctx.Value("tx").(*txnkv.KVTxn); ok {
+		return tx.Commit(context.Background())
+	}
+	return nil
+}
+
+func (store *TikvStore) RollbackTransaction(ctx context.Context) error {
+	if tx, ok := ctx.Value("tx").(*txnkv.KVTxn); ok {
+		return tx.Rollback()
+	}
+	return nil
+}
+
+// ~ Transaction Related APIs
+
+// Transaction Wrapper
+type TxnWrapper struct {
+	*txnkv.KVTxn
+	inContext bool
+}
+
+func (w *TxnWrapper) RunInTxn(f func(txn *txnkv.KVTxn) error) error {
+	err := f(w.KVTxn)
+	if !w.inContext {
+		if err != nil {
+			w.KVTxn.Rollback()
+			return err
+		}
+		w.KVTxn.Commit(context.Background())
+		return nil
+	}
+	return err
+}
+
+func (store *TikvStore) getTxn(ctx context.Context) (*TxnWrapper, error) {
+	if tx, ok := ctx.Value("tx").(*txnkv.KVTxn); ok {
+		return &TxnWrapper{tx, true}, nil
+	}
+	txn, err := store.client.Begin()
+	if err != nil {
+		return nil, err
+	}
+	return &TxnWrapper{txn, false}, nil
+}
+
+// ~ Transaction Wrapper
+
+// Encoding Functions
+func hashToBytes(dir string) []byte {
+	h := sha1.New()
+	io.WriteString(h, dir)
+	b := h.Sum(nil)
+	return b
+}
+
+func generateKey(dirPath, fileName string) []byte {
+	key := hashToBytes(dirPath)
+	key = append(key, []byte(fileName)...)
+	return key
+}
+
+func getNameFromKey(key []byte) string {
+	return string(key[sha1.Size:])
+}
+
+func genDirectoryKeyPrefix(fullpath util.FullPath, startFileName string) (keyPrefix []byte) {
+	keyPrefix = hashToBytes(string(fullpath))
+	if len(startFileName) > 0 {
+		keyPrefix = append(keyPrefix, []byte(startFileName)...)
+	}
+	return keyPrefix
+}
+
+func isNotExists(err error) bool {
+	if err == nil {
+		return false
+	}
+	if err.Error() == "not exist" {
+		return true
+	}
+	return false
+}
+
+// ~ Encoding Functions
diff --git a/weed/filer/tikv/tikv_store_kv.go b/weed/filer/tikv/tikv_store_kv.go
new file mode 100644
index 000000000..1d9428c69
--- /dev/null
+++ b/weed/filer/tikv/tikv_store_kv.go
@@ -0,0 +1,50 @@
+//go:build tikv
+// +build tikv
+
+package tikv
+
+import (
+	"context"
+
+	"github.com/chrislusf/seaweedfs/weed/filer"
+	"github.com/tikv/client-go/v2/txnkv"
+)
+
+func (store *TikvStore) KvPut(ctx context.Context, key []byte, value []byte) error {
+	tw, err := store.getTxn(ctx)
+	if err != nil {
+		return err
+	}
+	return tw.RunInTxn(func(txn *txnkv.KVTxn) error {
+		return txn.Set(key, value)
+	})
+}
+
+func (store *TikvStore) KvGet(ctx context.Context, key []byte) ([]byte, error) {
+	tw, err := store.getTxn(ctx)
+	if err != nil {
+		return nil, err
+	}
+	var data []byte = nil
+	err = tw.RunInTxn(func(txn *txnkv.KVTxn) error {
+		val, err := txn.Get(context.TODO(), key)
+		if err == nil {
+			data = val
+		}
+		return err
+	})
+	if isNotExists(err) {
+		return data, filer.ErrKvNotFound
+	}
+	return data, err
+}
+
+func (store *TikvStore) KvDelete(ctx context.Context, key []byte) error {
+	tw, err := store.getTxn(ctx)
+	if err != nil {
+		return err
+	}
+	return tw.RunInTxn(func(txn *txnkv.KVTxn) error {
+		return txn.Delete(key)
+	})
+}
diff --git a/weed/filesys/meta_cache/meta_cache_subscribe.go b/weed/filesys/meta_cache/meta_cache_subscribe.go
index c650b8024..2099cf1f8 100644
--- a/weed/filesys/meta_cache/meta_cache_subscribe.go
+++ b/weed/filesys/meta_cache/meta_cache_subscribe.go
@@ -39,11 +39,9 @@ func SubscribeMetaEvents(mc *MetaCache, selfSignature int32, client filer_pb.Fil
 		err := mc.AtomicUpdateEntryFromFiler(context.Background(), oldPath, newEntry)
 		if err == nil {
 			if message.OldEntry != nil && message.NewEntry != nil {
-				if message.OldEntry.Name == message.NewEntry.Name {
-					// no need to invalidate
-				} else {
-					oldKey := util.NewFullPath(resp.Directory, message.OldEntry.Name)
-					mc.invalidateFunc(oldKey)
+				oldKey := util.NewFullPath(resp.Directory, message.OldEntry.Name)
+				mc.invalidateFunc(oldKey)
+				if message.OldEntry.Name != message.NewEntry.Name {
 					newKey := util.NewFullPath(dir, message.NewEntry.Name)
 					mc.invalidateFunc(newKey)
 				}
@@ -59,8 +57,12 @@ func SubscribeMetaEvents(mc *MetaCache, selfSignature int32, client filer_pb.Fil
 
 	}
 
-	return util.Retry("followMetaUpdates", func() error {
+	util.RetryForever("followMetaUpdates", func() error {
 		return pb.WithFilerClientFollowMetadata(client, "mount", dir, lastTsNs, selfSignature, processEventFn, true)
+	}, func(err error) bool {
+		glog.Errorf("follow metadata updates: %v", err)
+		return true
 	})
 
+	return nil
 }
diff --git a/weed/filesys/wfs_write.go b/weed/filesys/wfs_write.go
index 42c13cfd0..ea8de24d5 100644
--- a/weed/filesys/wfs_write.go
+++ b/weed/filesys/wfs_write.go
@@ -58,7 +58,16 @@ func (wfs *WFS) saveDataAsChunk(fullPath util.FullPath, writeOnly bool) filer.Sa
 		if wfs.option.VolumeServerAccess == "filerProxy" {
 			fileUrl = fmt.Sprintf("http://%s/?proxyChunkId=%s", wfs.getCurrentFiler(), fileId)
 		}
-		uploadResult, err, data := operation.Upload(fileUrl, filename, wfs.option.Cipher, reader, false, "", nil, auth)
+		uploadOption := &operation.UploadOption{
+			UploadUrl:         fileUrl,
+			Filename:          filename,
+			Cipher:            wfs.option.Cipher,
+			IsInputCompressed: false,
+			MimeType:          "",
+			PairMap:           nil,
+			Jwt:               auth,
+		}
+		uploadResult, err, data := operation.Upload(reader, uploadOption)
 		if err != nil {
 			glog.V(0).Infof("upload data %v to %s: %v", filename, fileUrl, err)
 			return nil, "", "", fmt.Errorf("upload data: %v", err)
diff --git a/weed/filesys/xattr.go b/weed/filesys/xattr.go
index 473805116..4b2ee0064 100644
--- a/weed/filesys/xattr.go
+++ b/weed/filesys/xattr.go
@@ -116,7 +116,7 @@ func (wfs *WFS) maybeLoadEntry(dir, name string) (entry *filer_pb.Entry, err err
 	// return a valid entry for the mount root
 	if string(fullpath) == wfs.option.FilerMountRootPath {
 		return &filer_pb.Entry{
-			Name:        wfs.option.FilerMountRootPath,
+			Name:        name,
 			IsDirectory: true,
 			Attributes: &filer_pb.FuseAttributes{
 				Mtime:    wfs.option.MountMtime.Unix(),
diff --git a/weed/ftpd/ftp_server.go b/weed/ftpd/ftp_server.go
index 4a0dca2c3..4daded00a 100644
--- a/weed/ftpd/ftp_server.go
+++ b/weed/ftpd/ftp_server.go
@@ -3,8 +3,8 @@ package ftpd
 import (
 	"crypto/tls"
 	"errors"
-	"fmt"
 	"net"
+	"github.com/chrislusf/seaweedfs/weed/util"
 
 	ftpserver "github.com/fclairamb/ftpserverlib"
 	"google.golang.org/grpc"
@@ -51,7 +51,7 @@ func (s *SftpServer) GetSettings() (*ftpserver.Settings, error) {
 
 	return &ftpserver.Settings{
 		Listener:                 s.ftpListener,
-		ListenAddr:               fmt.Sprintf("%s:%d", s.option.IpBind, s.option.Port),
+		ListenAddr:               util.JoinHostPort(s.option.IpBind, s.option.Port),
 		PublicHost:               s.option.IP,
 		PassiveTransferPortRange: portRange,
 		ActiveTransferPortNon20:  true,
diff --git a/weed/messaging/broker/broker_append.go b/weed/messaging/broker/broker_append.go
index 40c807164..599efad98 100644
--- a/weed/messaging/broker/broker_append.go
+++ b/weed/messaging/broker/broker_append.go
@@ -88,7 +88,16 @@ func (broker *MessageBroker) assignAndUpload(topicConfig *messaging_pb.TopicConf
 
 	// upload data
 	targetUrl := fmt.Sprintf("http://%s/%s", assignResult.Url, assignResult.Fid)
-	uploadResult, err := operation.UploadData(targetUrl, "", broker.option.Cipher, data, false, "", nil, assignResult.Auth)
+	uploadOption := &operation.UploadOption{
+		UploadUrl:         targetUrl,
+		Filename:          "",
+		Cipher:            broker.option.Cipher,
+		IsInputCompressed: false,
+		MimeType:          "",
+		PairMap:           nil,
+		Jwt:               assignResult.Auth,
+	}
+	uploadResult, err := operation.UploadData(data, uploadOption)
 	if err != nil {
 		return nil, nil, fmt.Errorf("upload data %s: %v", targetUrl, err)
 	}
diff --git a/weed/operation/assign_file_id.go b/weed/operation/assign_file_id.go
index f441dcb50..8dbdbbe57 100644
--- a/weed/operation/assign_file_id.go
+++ b/weed/operation/assign_file_id.go
@@ -22,13 +22,18 @@ type VolumeAssignRequest struct {
 	WritableVolumeCount uint32
 }
 
+type AssignResultReplica struct {
+	Url       string `json:"url,omitempty"`
+	PublicUrl string `json:"publicUrl,omitempty"`
+}
 type AssignResult struct {
-	Fid       string              `json:"fid,omitempty"`
-	Url       string              `json:"url,omitempty"`
-	PublicUrl string              `json:"publicUrl,omitempty"`
-	Count     uint64              `json:"count,omitempty"`
-	Error     string              `json:"error,omitempty"`
-	Auth      security.EncodedJwt `json:"auth,omitempty"`
+	Fid       string                `json:"fid,omitempty"`
+	Url       string                `json:"url,omitempty"`
+	PublicUrl string                `json:"publicUrl,omitempty"`
+	Count     uint64                `json:"count,omitempty"`
+	Error     string                `json:"error,omitempty"`
+	Auth      security.EncodedJwt   `json:"auth,omitempty"`
+	Replicas  []AssignResultReplica `json:"replicas,omitempty"`
 }
 
 func Assign(masterFn GetMasterFn, grpcDialOption grpc.DialOption, primaryRequest *VolumeAssignRequest, alternativeRequests ...*VolumeAssignRequest) (*AssignResult, error) {
@@ -69,6 +74,12 @@ func Assign(masterFn GetMasterFn, grpcDialOption grpc.DialOption, primaryRequest
 			ret.PublicUrl = resp.PublicUrl
 			ret.Error = resp.Error
 			ret.Auth = security.EncodedJwt(resp.Auth)
+			for _, r := range resp.Replicas {
+				ret.Replicas = append(ret.Replicas, AssignResultReplica{
+					Url:       r.Url,
+					PublicUrl: r.PublicUrl,
+				})
+			}
 
 			if resp.Error != "" {
 				return fmt.Errorf("assignRequest: %v", resp.Error)
diff --git a/weed/operation/grpc_client.go b/weed/operation/grpc_client.go
index 025a65b38..39f70343a 100644
--- a/weed/operation/grpc_client.go
+++ b/weed/operation/grpc_client.go
@@ -2,6 +2,7 @@ package operation
 
 import (
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/util"
 	"strconv"
 	"strings"
 
@@ -35,7 +36,7 @@ func toVolumeServerGrpcAddress(volumeServer string) (grpcAddress string, err err
 		glog.Errorf("failed to parse volume server address: %v", volumeServer)
 		return "", err
 	}
-	return fmt.Sprintf("%s:%d", volumeServer[0:sepIndex], port+10000), nil
+	return util.JoinHostPort(volumeServer[0:sepIndex], port+10000), nil
 }
 
 func WithMasterServerClient(masterServer string, grpcDialOption grpc.DialOption, fn func(masterClient master_pb.SeaweedClient) error) error {
diff --git a/weed/operation/needle_parse_test.go b/weed/operation/needle_parse_test.go
index d7e8a4162..2b44b3b26 100644
--- a/weed/operation/needle_parse_test.go
+++ b/weed/operation/needle_parse_test.go
@@ -53,7 +53,16 @@ func TestCreateNeedleFromRequest(t *testing.T) {
 			assert.Equal(t, true, util.IsGzippedContent(n.Data), "this should be gzip")
 			fmt.Printf("needle: %v, originalSize: %d\n", n, originalSize)
 		}
-		uploadResult, err, data := Upload("http://localhost:8080/389,0f084d17353afda0", "t.txt", false, bytes.NewReader([]byte(textContent)), false, "", nil, "")
+		uploadOption := &UploadOption{
+			UploadUrl:         "http://localhost:8080/389,0f084d17353afda0",
+			Filename:          "t.txt",
+			Cipher:            false,
+			IsInputCompressed: false,
+			MimeType:          "",
+			PairMap:           nil,
+			Jwt:               "",
+		}
+		uploadResult, err, data := Upload(bytes.NewReader([]byte(textContent)), uploadOption)
 		if len(data) != len(textContent) {
 			t.Errorf("data actual %d expected %d", len(data), len(textContent))
 		}
@@ -72,7 +81,16 @@ func TestCreateNeedleFromRequest(t *testing.T) {
 			fmt.Printf("needle: %v, dataSize:%d originalSize:%d\n", n, len(n.Data), originalSize)
 		}
 		gzippedData, _ := util.GzipData([]byte(textContent))
-		Upload("http://localhost:8080/389,0f084d17353afda0", "t.txt", false, bytes.NewReader(gzippedData), true, "text/plain", nil, "")
+		uploadOption := &UploadOption{
+			UploadUrl:         "http://localhost:8080/389,0f084d17353afda0",
+			Filename:          "t.txt",
+			Cipher:            false,
+			IsInputCompressed: true,
+			MimeType:          "text/plain",
+			PairMap:           nil,
+			Jwt:               "",
+		}
+		Upload(bytes.NewReader(gzippedData), uploadOption)
 	}
 
 	/*
diff --git a/weed/operation/submit.go b/weed/operation/submit.go
index 87c5e4279..80bc6fcb4 100644
--- a/weed/operation/submit.go
+++ b/weed/operation/submit.go
@@ -206,7 +206,16 @@ func (fi FilePart) Upload(maxMB int, masterFn GetMasterFn, usePublicUrl bool, jw
 			cm.DeleteChunks(masterFn, usePublicUrl, grpcDialOption)
 		}
 	} else {
-		ret, e, _ := Upload(fileUrl, baseName, false, fi.Reader, false, fi.MimeType, nil, jwt)
+		uploadOption := &UploadOption{
+			UploadUrl:         fileUrl,
+			Filename:          baseName,
+			Cipher:            false,
+			IsInputCompressed: false,
+			MimeType:          fi.MimeType,
+			PairMap:           nil,
+			Jwt:               jwt,
+		}
+		ret, e, _ := Upload(fi.Reader, uploadOption)
 		if e != nil {
 			return 0, e
 		}
@@ -219,7 +228,16 @@ func upload_one_chunk(filename string, reader io.Reader, masterFn GetMasterFn,
 	fileUrl string, jwt security.EncodedJwt,
 ) (size uint32, e error) {
 	glog.V(4).Info("Uploading part ", filename, " to ", fileUrl, "...")
-	uploadResult, uploadError, _ := Upload(fileUrl, filename, false, reader, false, "", nil, jwt)
+	uploadOption := &UploadOption{
+		UploadUrl:         fileUrl,
+		Filename:          filename,
+		Cipher:            false,
+		IsInputCompressed: false,
+		MimeType:          "",
+		PairMap:           nil,
+		Jwt:               jwt,
+	}
+	uploadResult, uploadError, _ := Upload(reader, uploadOption)
 	if uploadError != nil {
 		return 0, uploadError
 	}
@@ -236,6 +254,15 @@ func upload_chunked_file_manifest(fileUrl string, manifest *ChunkManifest, jwt s
 	q := u.Query()
 	q.Set("cm", "true")
 	u.RawQuery = q.Encode()
-	_, e = UploadData(u.String(), manifest.Name, false, buf, false, "application/json", nil, jwt)
+	uploadOption := &UploadOption{
+		UploadUrl:         u.String(),
+		Filename:          manifest.Name,
+		Cipher:            false,
+		IsInputCompressed: false,
+		MimeType:          "application/json",
+		PairMap:           nil,
+		Jwt:               jwt,
+	}
+	_, e = UploadData(buf, uploadOption)
 	return e
 }
diff --git a/weed/operation/upload_content.go b/weed/operation/upload_content.go
index 8e7c6f733..33f6fba10 100644
--- a/weed/operation/upload_content.go
+++ b/weed/operation/upload_content.go
@@ -20,6 +20,16 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/util"
 )
 
+type UploadOption struct {
+	UploadUrl         string
+	Filename          string
+	Cipher            bool
+	IsInputCompressed bool
+	MimeType          string
+	PairMap           map[string]string
+	Jwt               security.EncodedJwt
+}
+
 type UploadResult struct {
 	Name       string `json:"name,omitempty"`
 	Size       uint32 `json:"size,omitempty"`
@@ -65,18 +75,18 @@ func init() {
 var fileNameEscaper = strings.NewReplacer(`\`, `\\`, `"`, `\"`)
 
 // Upload sends a POST request to a volume server to upload the content with adjustable compression level
-func UploadData(uploadUrl string, filename string, cipher bool, data []byte, isInputCompressed bool, mtype string, pairMap map[string]string, jwt security.EncodedJwt) (uploadResult *UploadResult, err error) {
-	uploadResult, err = retriedUploadData(uploadUrl, filename, cipher, data, isInputCompressed, mtype, pairMap, jwt)
+func UploadData(data []byte, option *UploadOption) (uploadResult *UploadResult, err error) {
+	uploadResult, err = retriedUploadData(data, option)
 	return
 }
 
 // Upload sends a POST request to a volume server to upload the content with fast compression
-func Upload(uploadUrl string, filename string, cipher bool, reader io.Reader, isInputCompressed bool, mtype string, pairMap map[string]string, jwt security.EncodedJwt) (uploadResult *UploadResult, err error, data []byte) {
-	uploadResult, err, data = doUpload(uploadUrl, filename, cipher, reader, isInputCompressed, mtype, pairMap, jwt)
+func Upload(reader io.Reader, option *UploadOption) (uploadResult *UploadResult, err error, data []byte) {
+	uploadResult, err, data = doUpload(reader, option)
 	return
 }
 
-func doUpload(uploadUrl string, filename string, cipher bool, reader io.Reader, isInputCompressed bool, mtype string, pairMap map[string]string, jwt security.EncodedJwt) (uploadResult *UploadResult, err error, data []byte) {
+func doUpload(reader io.Reader, option *UploadOption) (uploadResult *UploadResult, err error, data []byte) {
 	bytesReader, ok := reader.(*util.BytesReader)
 	if ok {
 		data = bytesReader.Bytes
@@ -87,38 +97,38 @@ func doUpload(uploadUrl string, filename string, cipher bool, reader io.Reader,
 			return
 		}
 	}
-	uploadResult, uploadErr := retriedUploadData(uploadUrl, filename, cipher, data, isInputCompressed, mtype, pairMap, jwt)
+	uploadResult, uploadErr := retriedUploadData(data, option)
 	return uploadResult, uploadErr, data
 }
 
-func retriedUploadData(uploadUrl string, filename string, cipher bool, data []byte, isInputCompressed bool, mtype string, pairMap map[string]string, jwt security.EncodedJwt) (uploadResult *UploadResult, err error) {
+func retriedUploadData(data []byte, option *UploadOption) (uploadResult *UploadResult, err error) {
 	for i := 0; i < 3; i++ {
-		uploadResult, err = doUploadData(uploadUrl, filename, cipher, data, isInputCompressed, mtype, pairMap, jwt)
+		uploadResult, err = doUploadData(data, option)
 		if err == nil {
 			uploadResult.RetryCount = i
 			return
 		} else {
-			glog.Warningf("uploading to %s: %v", uploadUrl, err)
+			glog.Warningf("uploading to %s: %v", option.UploadUrl, err)
 		}
 		time.Sleep(time.Millisecond * time.Duration(237*(i+1)))
 	}
 	return
 }
 
-func doUploadData(uploadUrl string, filename string, cipher bool, data []byte, isInputCompressed bool, mtype string, pairMap map[string]string, jwt security.EncodedJwt) (uploadResult *UploadResult, err error) {
-	contentIsGzipped := isInputCompressed
+func doUploadData(data []byte, option *UploadOption) (uploadResult *UploadResult, err error) {
+	contentIsGzipped := option.IsInputCompressed
 	shouldGzipNow := false
-	if !isInputCompressed {
-		if mtype == "" {
-			mtype = http.DetectContentType(data)
-			// println("detect1 mimetype to", mtype)
-			if mtype == "application/octet-stream" {
-				mtype = ""
+	if !option.IsInputCompressed {
+		if option.MimeType == "" {
+			option.MimeType = http.DetectContentType(data)
+			// println("detect1 mimetype to", MimeType)
+			if option.MimeType == "application/octet-stream" {
+				option.MimeType = ""
 			}
 		}
-		if shouldBeCompressed, iAmSure := util.IsCompressableFileType(filepath.Base(filename), mtype); iAmSure && shouldBeCompressed {
+		if shouldBeCompressed, iAmSure := util.IsCompressableFileType(filepath.Base(option.Filename), option.MimeType); iAmSure && shouldBeCompressed {
 			shouldGzipNow = true
-		} else if !iAmSure && mtype == "" && len(data) > 16*1024 {
+		} else if !iAmSure && option.MimeType == "" && len(data) > 16*1024 {
 			var compressed []byte
 			compressed, err = util.GzipData(data[0:128])
 			shouldGzipNow = len(compressed)*10 < 128*9 // can not compress to less than 90%
@@ -131,14 +141,14 @@ func doUploadData(uploadUrl string, filename string, cipher bool, data []byte, i
 	// this could be double copying
 	clearDataLen = len(data)
 	clearData := data
-	if shouldGzipNow && !cipher {
+	if shouldGzipNow && !option.Cipher {
 		compressed, compressErr := util.GzipData(data)
 		// fmt.Printf("data is compressed from %d ==> %d\n", len(data), len(compressed))
 		if compressErr == nil {
 			data = compressed
 			contentIsGzipped = true
 		}
-	} else if isInputCompressed {
+	} else if option.IsInputCompressed {
 		// just to get the clear data length
 		clearData, err = util.DecompressData(data)
 		if err == nil {
@@ -146,7 +156,7 @@ func doUploadData(uploadUrl string, filename string, cipher bool, data []byte, i
 		}
 	}
 
-	if cipher {
+	if option.Cipher {
 		// encrypt(gzip(data))
 
 		// encrypt
@@ -158,23 +168,39 @@ func doUploadData(uploadUrl string, filename string, cipher bool, data []byte, i
 		}
 
 		// upload data
-		uploadResult, err = upload_content(uploadUrl, func(w io.Writer) (err error) {
+		uploadResult, err = upload_content(func(w io.Writer) (err error) {
 			_, err = w.Write(encryptedData)
 			return
-		}, "", false, len(encryptedData), "", nil, jwt)
+		}, len(encryptedData), &UploadOption{
+			UploadUrl:         option.UploadUrl,
+			Filename:          "",
+			Cipher:            false,
+			IsInputCompressed: false,
+			MimeType:          "",
+			PairMap:           nil,
+			Jwt:               option.Jwt,
+		})
 		if uploadResult == nil {
 			return
 		}
-		uploadResult.Name = filename
-		uploadResult.Mime = mtype
+		uploadResult.Name = option.Filename
+		uploadResult.Mime = option.MimeType
 		uploadResult.CipherKey = cipherKey
 		uploadResult.Size = uint32(clearDataLen)
 	} else {
 		// upload data
-		uploadResult, err = upload_content(uploadUrl, func(w io.Writer) (err error) {
+		uploadResult, err = upload_content(func(w io.Writer) (err error) {
 			_, err = w.Write(data)
 			return
-		}, filename, contentIsGzipped, len(data), mtype, pairMap, jwt)
+		}, len(data), &UploadOption{
+			UploadUrl:         option.UploadUrl,
+			Filename:          option.Filename,
+			Cipher:            false,
+			IsInputCompressed: contentIsGzipped,
+			MimeType:          option.MimeType,
+			PairMap:           option.PairMap,
+			Jwt:               option.Jwt,
+		})
 		if uploadResult == nil {
 			return
 		}
@@ -187,20 +213,20 @@ func doUploadData(uploadUrl string, filename string, cipher bool, data []byte, i
 	return uploadResult, err
 }
 
-func upload_content(uploadUrl string, fillBufferFunction func(w io.Writer) error, filename string, isGzipped bool, originalDataSize int, mtype string, pairMap map[string]string, jwt security.EncodedJwt) (*UploadResult, error) {
+func upload_content(fillBufferFunction func(w io.Writer) error, originalDataSize int, option *UploadOption) (*UploadResult, error) {
 	buf := GetBuffer()
 	defer PutBuffer(buf)
 	body_writer := multipart.NewWriter(buf)
 	h := make(textproto.MIMEHeader)
-	h.Set("Content-Disposition", fmt.Sprintf(`form-data; name="file"; filename="%s"`, fileNameEscaper.Replace(filename)))
-	h.Set("Idempotency-Key", uploadUrl)
-	if mtype == "" {
-		mtype = mime.TypeByExtension(strings.ToLower(filepath.Ext(filename)))
+	h.Set("Content-Disposition", fmt.Sprintf(`form-data; name="file"; filename="%s"`, fileNameEscaper.Replace(option.Filename)))
+	h.Set("Idempotency-Key", option.UploadUrl)
+	if option.MimeType == "" {
+		option.MimeType = mime.TypeByExtension(strings.ToLower(filepath.Ext(option.Filename)))
 	}
-	if mtype != "" {
-		h.Set("Content-Type", mtype)
+	if option.MimeType != "" {
+		h.Set("Content-Type", option.MimeType)
 	}
-	if isGzipped {
+	if option.IsInputCompressed {
 		h.Set("Content-Encoding", "gzip")
 	}
 
@@ -219,17 +245,17 @@ func upload_content(uploadUrl string, fillBufferFunction func(w io.Writer) error
 		return nil, err
 	}
 
-	req, postErr := http.NewRequest("POST", uploadUrl, bytes.NewReader(buf.Bytes()))
+	req, postErr := http.NewRequest("POST", option.UploadUrl, bytes.NewReader(buf.Bytes()))
 	if postErr != nil {
-		glog.V(1).Infof("create upload request %s: %v", uploadUrl, postErr)
-		return nil, fmt.Errorf("create upload request %s: %v", uploadUrl, postErr)
+		glog.V(1).Infof("create upload request %s: %v", option.UploadUrl, postErr)
+		return nil, fmt.Errorf("create upload request %s: %v", option.UploadUrl, postErr)
 	}
 	req.Header.Set("Content-Type", content_type)
-	for k, v := range pairMap {
+	for k, v := range option.PairMap {
 		req.Header.Set(k, v)
 	}
-	if jwt != "" {
-		req.Header.Set("Authorization", "BEARER "+string(jwt))
+	if option.Jwt != "" {
+		req.Header.Set("Authorization", "BEARER "+string(option.Jwt))
 	}
 	// print("+")
 	resp, post_err := HttpClient.Do(req)
@@ -240,7 +266,7 @@ func upload_content(uploadUrl string, fillBufferFunction func(w io.Writer) error
 		}
 	}
 	if post_err != nil {
-		return nil, fmt.Errorf("upload %s %d bytes to %v: %v", filename, originalDataSize, uploadUrl, post_err)
+		return nil, fmt.Errorf("upload %s %d bytes to %v: %v", option.Filename, originalDataSize, option.UploadUrl, post_err)
 	}
 	// print("-")
 	defer util.CloseResponse(resp)
@@ -254,16 +280,16 @@ func upload_content(uploadUrl string, fillBufferFunction func(w io.Writer) error
 
 	resp_body, ra_err := ioutil.ReadAll(resp.Body)
 	if ra_err != nil {
-		return nil, fmt.Errorf("read response body %v: %v", uploadUrl, ra_err)
+		return nil, fmt.Errorf("read response body %v: %v", option.UploadUrl, ra_err)
 	}
 
 	unmarshal_err := json.Unmarshal(resp_body, &ret)
 	if unmarshal_err != nil {
-		glog.Errorf("unmarshal %s: %v", uploadUrl, string(resp_body))
-		return nil, fmt.Errorf("unmarshal %v: %v", uploadUrl, unmarshal_err)
+		glog.Errorf("unmarshal %s: %v", option.UploadUrl, string(resp_body))
+		return nil, fmt.Errorf("unmarshal %v: %v", option.UploadUrl, unmarshal_err)
 	}
 	if ret.Error != "" {
-		return nil, fmt.Errorf("unmarshalled error %v: %v", uploadUrl, ret.Error)
+		return nil, fmt.Errorf("unmarshalled error %v: %v", option.UploadUrl, ret.Error)
 	}
 	ret.ETag = etag
 	ret.ContentMd5 = resp.Header.Get("Content-MD5")
diff --git a/weed/pb/Makefile b/weed/pb/Makefile
index d2618937b..72c738135 100644
--- a/weed/pb/Makefile
+++ b/weed/pb/Makefile
@@ -6,6 +6,7 @@ gen:
 	protoc master.proto --go_out=plugins=grpc:./master_pb --go_opt=paths=source_relative
 	protoc volume_server.proto --go_out=plugins=grpc:./volume_server_pb --go_opt=paths=source_relative
 	protoc filer.proto --go_out=plugins=grpc:./filer_pb --go_opt=paths=source_relative
+	protoc remote.proto --go_out=plugins=grpc:./remote_pb --go_opt=paths=source_relative
 	protoc iam.proto --go_out=plugins=grpc:./iam_pb --go_opt=paths=source_relative
 	protoc messaging.proto --go_out=plugins=grpc:./messaging_pb --go_opt=paths=source_relative
 	# protoc filer.proto --java_out=../../other/java/client/src/main/java
diff --git a/weed/pb/filer.proto b/weed/pb/filer.proto
index 1c22276ae..7b1838565 100644
--- a/weed/pb/filer.proto
+++ b/weed/pb/filer.proto
@@ -305,6 +305,7 @@ message GetFilerConfigurationResponse {
     string metrics_address = 9;
     int32 metrics_interval_sec = 10;
     string version = 11;
+    string cluster_id = 12;
 }
 
 message SubscribeMetadataRequest {
@@ -312,6 +313,7 @@ message SubscribeMetadataRequest {
     string path_prefix = 2;
     int64 since_ns = 3;
     int32 signature = 4;
+    repeated string path_prefixes = 6;
 }
 message SubscribeMetadataResponse {
     string directory = 1;
@@ -336,6 +338,7 @@ message KeepConnectedResponse {
 message LocateBrokerRequest {
     string resource = 1;
 }
+
 message LocateBrokerResponse {
     bool found = 1;
     // if found, send the exact address
@@ -386,23 +389,6 @@ message FilerConf {
 /////////////////////////
 // Remote Storage related
 /////////////////////////
-message RemoteConf {
-    string type = 1;
-    string name = 2;
-    string s3_access_key = 4;
-    string s3_secret_key = 5;
-    string s3_region = 6;
-    string s3_endpoint = 7;
-}
-
-message RemoteStorageMapping {
-    map<string,RemoteStorageLocation> mappings = 1;
-}
-message RemoteStorageLocation {
-    string name = 1;
-    string bucket = 2;
-    string path = 3;
-}
 message DownloadToLocalRequest {
     string directory = 1;
     string name = 2;
diff --git a/weed/pb/filer_pb/filer.pb.go b/weed/pb/filer_pb/filer.pb.go
index 702f7e3df..240338384 100644
--- a/weed/pb/filer_pb/filer.pb.go
+++ b/weed/pb/filer_pb/filer.pb.go
@@ -2404,6 +2404,7 @@ type GetFilerConfigurationResponse struct {
 	MetricsAddress     string   `protobuf:"bytes,9,opt,name=metrics_address,json=metricsAddress,proto3" json:"metrics_address,omitempty"`
 	MetricsIntervalSec int32    `protobuf:"varint,10,opt,name=metrics_interval_sec,json=metricsIntervalSec,proto3" json:"metrics_interval_sec,omitempty"`
 	Version            string   `protobuf:"bytes,11,opt,name=version,proto3" json:"version,omitempty"`
+	ClusterId          string   `protobuf:"bytes,12,opt,name=cluster_id,json=clusterId,proto3" json:"cluster_id,omitempty"`
 }
 
 func (x *GetFilerConfigurationResponse) Reset() {
@@ -2508,15 +2509,23 @@ func (x *GetFilerConfigurationResponse) GetVersion() string {
 	return ""
 }
 
+func (x *GetFilerConfigurationResponse) GetClusterId() string {
+	if x != nil {
+		return x.ClusterId
+	}
+	return ""
+}
+
 type SubscribeMetadataRequest struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	ClientName string `protobuf:"bytes,1,opt,name=client_name,json=clientName,proto3" json:"client_name,omitempty"`
-	PathPrefix string `protobuf:"bytes,2,opt,name=path_prefix,json=pathPrefix,proto3" json:"path_prefix,omitempty"`
-	SinceNs    int64  `protobuf:"varint,3,opt,name=since_ns,json=sinceNs,proto3" json:"since_ns,omitempty"`
-	Signature  int32  `protobuf:"varint,4,opt,name=signature,proto3" json:"signature,omitempty"`
+	ClientName   string   `protobuf:"bytes,1,opt,name=client_name,json=clientName,proto3" json:"client_name,omitempty"`
+	PathPrefix   string   `protobuf:"bytes,2,opt,name=path_prefix,json=pathPrefix,proto3" json:"path_prefix,omitempty"`
+	SinceNs      int64    `protobuf:"varint,3,opt,name=since_ns,json=sinceNs,proto3" json:"since_ns,omitempty"`
+	Signature    int32    `protobuf:"varint,4,opt,name=signature,proto3" json:"signature,omitempty"`
+	PathPrefixes []string `protobuf:"bytes,6,rep,name=path_prefixes,json=pathPrefixes,proto3" json:"path_prefixes,omitempty"`
 }
 
 func (x *SubscribeMetadataRequest) Reset() {
@@ -2579,6 +2588,13 @@ func (x *SubscribeMetadataRequest) GetSignature() int32 {
 	return 0
 }
 
+func (x *SubscribeMetadataRequest) GetPathPrefixes() []string {
+	if x != nil {
+		return x.PathPrefixes
+	}
+	return nil
+}
+
 type SubscribeMetadataResponse struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -3176,203 +3192,6 @@ func (x *FilerConf) GetLocations() []*FilerConf_PathConf {
 /////////////////////////
 // Remote Storage related
 /////////////////////////
-type RemoteConf struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-
-	Type        string `protobuf:"bytes,1,opt,name=type,proto3" json:"type,omitempty"`
-	Name        string `protobuf:"bytes,2,opt,name=name,proto3" json:"name,omitempty"`
-	S3AccessKey string `protobuf:"bytes,4,opt,name=s3_access_key,json=s3AccessKey,proto3" json:"s3_access_key,omitempty"`
-	S3SecretKey string `protobuf:"bytes,5,opt,name=s3_secret_key,json=s3SecretKey,proto3" json:"s3_secret_key,omitempty"`
-	S3Region    string `protobuf:"bytes,6,opt,name=s3_region,json=s3Region,proto3" json:"s3_region,omitempty"`
-	S3Endpoint  string `protobuf:"bytes,7,opt,name=s3_endpoint,json=s3Endpoint,proto3" json:"s3_endpoint,omitempty"`
-}
-
-func (x *RemoteConf) Reset() {
-	*x = RemoteConf{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_filer_proto_msgTypes[49]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
-}
-
-func (x *RemoteConf) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*RemoteConf) ProtoMessage() {}
-
-func (x *RemoteConf) ProtoReflect() protoreflect.Message {
-	mi := &file_filer_proto_msgTypes[49]
-	if protoimpl.UnsafeEnabled && x != nil {
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		if ms.LoadMessageInfo() == nil {
-			ms.StoreMessageInfo(mi)
-		}
-		return ms
-	}
-	return mi.MessageOf(x)
-}
-
-// Deprecated: Use RemoteConf.ProtoReflect.Descriptor instead.
-func (*RemoteConf) Descriptor() ([]byte, []int) {
-	return file_filer_proto_rawDescGZIP(), []int{49}
-}
-
-func (x *RemoteConf) GetType() string {
-	if x != nil {
-		return x.Type
-	}
-	return ""
-}
-
-func (x *RemoteConf) GetName() string {
-	if x != nil {
-		return x.Name
-	}
-	return ""
-}
-
-func (x *RemoteConf) GetS3AccessKey() string {
-	if x != nil {
-		return x.S3AccessKey
-	}
-	return ""
-}
-
-func (x *RemoteConf) GetS3SecretKey() string {
-	if x != nil {
-		return x.S3SecretKey
-	}
-	return ""
-}
-
-func (x *RemoteConf) GetS3Region() string {
-	if x != nil {
-		return x.S3Region
-	}
-	return ""
-}
-
-func (x *RemoteConf) GetS3Endpoint() string {
-	if x != nil {
-		return x.S3Endpoint
-	}
-	return ""
-}
-
-type RemoteStorageMapping struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-
-	Mappings map[string]*RemoteStorageLocation `protobuf:"bytes,1,rep,name=mappings,proto3" json:"mappings,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
-}
-
-func (x *RemoteStorageMapping) Reset() {
-	*x = RemoteStorageMapping{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_filer_proto_msgTypes[50]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
-}
-
-func (x *RemoteStorageMapping) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*RemoteStorageMapping) ProtoMessage() {}
-
-func (x *RemoteStorageMapping) ProtoReflect() protoreflect.Message {
-	mi := &file_filer_proto_msgTypes[50]
-	if protoimpl.UnsafeEnabled && x != nil {
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		if ms.LoadMessageInfo() == nil {
-			ms.StoreMessageInfo(mi)
-		}
-		return ms
-	}
-	return mi.MessageOf(x)
-}
-
-// Deprecated: Use RemoteStorageMapping.ProtoReflect.Descriptor instead.
-func (*RemoteStorageMapping) Descriptor() ([]byte, []int) {
-	return file_filer_proto_rawDescGZIP(), []int{50}
-}
-
-func (x *RemoteStorageMapping) GetMappings() map[string]*RemoteStorageLocation {
-	if x != nil {
-		return x.Mappings
-	}
-	return nil
-}
-
-type RemoteStorageLocation struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-
-	Name   string `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
-	Bucket string `protobuf:"bytes,2,opt,name=bucket,proto3" json:"bucket,omitempty"`
-	Path   string `protobuf:"bytes,3,opt,name=path,proto3" json:"path,omitempty"`
-}
-
-func (x *RemoteStorageLocation) Reset() {
-	*x = RemoteStorageLocation{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_filer_proto_msgTypes[51]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
-}
-
-func (x *RemoteStorageLocation) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*RemoteStorageLocation) ProtoMessage() {}
-
-func (x *RemoteStorageLocation) ProtoReflect() protoreflect.Message {
-	mi := &file_filer_proto_msgTypes[51]
-	if protoimpl.UnsafeEnabled && x != nil {
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		if ms.LoadMessageInfo() == nil {
-			ms.StoreMessageInfo(mi)
-		}
-		return ms
-	}
-	return mi.MessageOf(x)
-}
-
-// Deprecated: Use RemoteStorageLocation.ProtoReflect.Descriptor instead.
-func (*RemoteStorageLocation) Descriptor() ([]byte, []int) {
-	return file_filer_proto_rawDescGZIP(), []int{51}
-}
-
-func (x *RemoteStorageLocation) GetName() string {
-	if x != nil {
-		return x.Name
-	}
-	return ""
-}
-
-func (x *RemoteStorageLocation) GetBucket() string {
-	if x != nil {
-		return x.Bucket
-	}
-	return ""
-}
-
-func (x *RemoteStorageLocation) GetPath() string {
-	if x != nil {
-		return x.Path
-	}
-	return ""
-}
-
 type DownloadToLocalRequest struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -3385,7 +3204,7 @@ type DownloadToLocalRequest struct {
 func (x *DownloadToLocalRequest) Reset() {
 	*x = DownloadToLocalRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_filer_proto_msgTypes[52]
+		mi := &file_filer_proto_msgTypes[49]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -3398,7 +3217,7 @@ func (x *DownloadToLocalRequest) String() string {
 func (*DownloadToLocalRequest) ProtoMessage() {}
 
 func (x *DownloadToLocalRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_filer_proto_msgTypes[52]
+	mi := &file_filer_proto_msgTypes[49]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -3411,7 +3230,7 @@ func (x *DownloadToLocalRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use DownloadToLocalRequest.ProtoReflect.Descriptor instead.
 func (*DownloadToLocalRequest) Descriptor() ([]byte, []int) {
-	return file_filer_proto_rawDescGZIP(), []int{52}
+	return file_filer_proto_rawDescGZIP(), []int{49}
 }
 
 func (x *DownloadToLocalRequest) GetDirectory() string {
@@ -3439,7 +3258,7 @@ type DownloadToLocalResponse struct {
 func (x *DownloadToLocalResponse) Reset() {
 	*x = DownloadToLocalResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_filer_proto_msgTypes[53]
+		mi := &file_filer_proto_msgTypes[50]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -3452,7 +3271,7 @@ func (x *DownloadToLocalResponse) String() string {
 func (*DownloadToLocalResponse) ProtoMessage() {}
 
 func (x *DownloadToLocalResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_filer_proto_msgTypes[53]
+	mi := &file_filer_proto_msgTypes[50]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -3465,7 +3284,7 @@ func (x *DownloadToLocalResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use DownloadToLocalResponse.ProtoReflect.Descriptor instead.
 func (*DownloadToLocalResponse) Descriptor() ([]byte, []int) {
-	return file_filer_proto_rawDescGZIP(), []int{53}
+	return file_filer_proto_rawDescGZIP(), []int{50}
 }
 
 func (x *DownloadToLocalResponse) GetEntry() *Entry {
@@ -3489,7 +3308,7 @@ type LocateBrokerResponse_Resource struct {
 func (x *LocateBrokerResponse_Resource) Reset() {
 	*x = LocateBrokerResponse_Resource{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_filer_proto_msgTypes[56]
+		mi := &file_filer_proto_msgTypes[53]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -3502,7 +3321,7 @@ func (x *LocateBrokerResponse_Resource) String() string {
 func (*LocateBrokerResponse_Resource) ProtoMessage() {}
 
 func (x *LocateBrokerResponse_Resource) ProtoReflect() protoreflect.Message {
-	mi := &file_filer_proto_msgTypes[56]
+	mi := &file_filer_proto_msgTypes[53]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -3550,7 +3369,7 @@ type FilerConf_PathConf struct {
 func (x *FilerConf_PathConf) Reset() {
 	*x = FilerConf_PathConf{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_filer_proto_msgTypes[57]
+		mi := &file_filer_proto_msgTypes[54]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -3563,7 +3382,7 @@ func (x *FilerConf_PathConf) String() string {
 func (*FilerConf_PathConf) ProtoMessage() {}
 
 func (x *FilerConf_PathConf) ProtoReflect() protoreflect.Message {
-	mi := &file_filer_proto_msgTypes[57]
+	mi := &file_filer_proto_msgTypes[54]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -3947,7 +3766,7 @@ var file_filer_proto_rawDesc = []byte{
 	0x66, 0x69, 0x6c, 0x65, 0x5f, 0x63, 0x6f, 0x75, 0x6e, 0x74, 0x18, 0x06, 0x20, 0x01, 0x28, 0x04,
 	0x52, 0x09, 0x66, 0x69, 0x6c, 0x65, 0x43, 0x6f, 0x75, 0x6e, 0x74, 0x22, 0x1e, 0x0a, 0x1c, 0x47,
 	0x65, 0x74, 0x46, 0x69, 0x6c, 0x65, 0x72, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x75, 0x72, 0x61,
-	0x74, 0x69, 0x6f, 0x6e, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x22, 0xde, 0x02, 0x0a, 0x1d,
+	0x74, 0x69, 0x6f, 0x6e, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x22, 0xfd, 0x02, 0x0a, 0x1d,
 	0x47, 0x65, 0x74, 0x46, 0x69, 0x6c, 0x65, 0x72, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x75, 0x72,
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@@ -3969,243 +3788,218 @@ var file_filer_proto_rawDesc = []byte{
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 }
 
 var (
@@ -4220,7 +4014,7 @@ func file_filer_proto_rawDescGZIP() []byte {
 	return file_filer_proto_rawDescData
 }
 
-var file_filer_proto_msgTypes = make([]protoimpl.MessageInfo, 59)
+var file_filer_proto_msgTypes = make([]protoimpl.MessageInfo, 55)
 var file_filer_proto_goTypes = []interface{}{
 	(*LookupDirectoryEntryRequest)(nil),   // 0: filer_pb.LookupDirectoryEntryRequest
 	(*LookupDirectoryEntryResponse)(nil),  // 1: filer_pb.LookupDirectoryEntryResponse
@@ -4271,23 +4065,19 @@ var file_filer_proto_goTypes = []interface{}{
 	(*KvPutRequest)(nil),                  // 46: filer_pb.KvPutRequest
 	(*KvPutResponse)(nil),                 // 47: filer_pb.KvPutResponse
 	(*FilerConf)(nil),                     // 48: filer_pb.FilerConf
-	(*RemoteConf)(nil),                    // 49: filer_pb.RemoteConf
-	(*RemoteStorageMapping)(nil),          // 50: filer_pb.RemoteStorageMapping
-	(*RemoteStorageLocation)(nil),         // 51: filer_pb.RemoteStorageLocation
-	(*DownloadToLocalRequest)(nil),        // 52: filer_pb.DownloadToLocalRequest
-	(*DownloadToLocalResponse)(nil),       // 53: filer_pb.DownloadToLocalResponse
-	nil,                                   // 54: filer_pb.Entry.ExtendedEntry
-	nil,                                   // 55: filer_pb.LookupVolumeResponse.LocationsMapEntry
-	(*LocateBrokerResponse_Resource)(nil), // 56: filer_pb.LocateBrokerResponse.Resource
-	(*FilerConf_PathConf)(nil),            // 57: filer_pb.FilerConf.PathConf
-	nil,                                   // 58: filer_pb.RemoteStorageMapping.MappingsEntry
+	(*DownloadToLocalRequest)(nil),        // 49: filer_pb.DownloadToLocalRequest
+	(*DownloadToLocalResponse)(nil),       // 50: filer_pb.DownloadToLocalResponse
+	nil,                                   // 51: filer_pb.Entry.ExtendedEntry
+	nil,                                   // 52: filer_pb.LookupVolumeResponse.LocationsMapEntry
+	(*LocateBrokerResponse_Resource)(nil), // 53: filer_pb.LocateBrokerResponse.Resource
+	(*FilerConf_PathConf)(nil),            // 54: filer_pb.FilerConf.PathConf
 }
 var file_filer_proto_depIdxs = []int32{
 	5,  // 0: filer_pb.LookupDirectoryEntryResponse.entry:type_name -> filer_pb.Entry
 	5,  // 1: filer_pb.ListEntriesResponse.entry:type_name -> filer_pb.Entry
 	8,  // 2: filer_pb.Entry.chunks:type_name -> filer_pb.FileChunk
 	11, // 3: filer_pb.Entry.attributes:type_name -> filer_pb.FuseAttributes
-	54, // 4: filer_pb.Entry.extended:type_name -> filer_pb.Entry.ExtendedEntry
+	51, // 4: filer_pb.Entry.extended:type_name -> filer_pb.Entry.ExtendedEntry
 	4,  // 5: filer_pb.Entry.remote_entry:type_name -> filer_pb.RemoteEntry
 	5,  // 6: filer_pb.FullEntry.entry:type_name -> filer_pb.Entry
 	5,  // 7: filer_pb.EventNotification.old_entry:type_name -> filer_pb.Entry
@@ -4299,60 +4089,58 @@ var file_filer_proto_depIdxs = []int32{
 	5,  // 13: filer_pb.UpdateEntryRequest.entry:type_name -> filer_pb.Entry
 	8,  // 14: filer_pb.AppendToEntryRequest.chunks:type_name -> filer_pb.FileChunk
 	26, // 15: filer_pb.Locations.locations:type_name -> filer_pb.Location
-	55, // 16: filer_pb.LookupVolumeResponse.locations_map:type_name -> filer_pb.LookupVolumeResponse.LocationsMapEntry
+	52, // 16: filer_pb.LookupVolumeResponse.locations_map:type_name -> filer_pb.LookupVolumeResponse.LocationsMapEntry
 	28, // 17: filer_pb.CollectionListResponse.collections:type_name -> filer_pb.Collection
 	7,  // 18: filer_pb.SubscribeMetadataResponse.event_notification:type_name -> filer_pb.EventNotification
-	56, // 19: filer_pb.LocateBrokerResponse.resources:type_name -> filer_pb.LocateBrokerResponse.Resource
-	57, // 20: filer_pb.FilerConf.locations:type_name -> filer_pb.FilerConf.PathConf
-	58, // 21: filer_pb.RemoteStorageMapping.mappings:type_name -> filer_pb.RemoteStorageMapping.MappingsEntry
-	5,  // 22: filer_pb.DownloadToLocalResponse.entry:type_name -> filer_pb.Entry
-	25, // 23: filer_pb.LookupVolumeResponse.LocationsMapEntry.value:type_name -> filer_pb.Locations
-	51, // 24: filer_pb.RemoteStorageMapping.MappingsEntry.value:type_name -> filer_pb.RemoteStorageLocation
-	0,  // 25: filer_pb.SeaweedFiler.LookupDirectoryEntry:input_type -> filer_pb.LookupDirectoryEntryRequest
-	2,  // 26: filer_pb.SeaweedFiler.ListEntries:input_type -> filer_pb.ListEntriesRequest
-	12, // 27: filer_pb.SeaweedFiler.CreateEntry:input_type -> filer_pb.CreateEntryRequest
-	14, // 28: filer_pb.SeaweedFiler.UpdateEntry:input_type -> filer_pb.UpdateEntryRequest
-	16, // 29: filer_pb.SeaweedFiler.AppendToEntry:input_type -> filer_pb.AppendToEntryRequest
-	18, // 30: filer_pb.SeaweedFiler.DeleteEntry:input_type -> filer_pb.DeleteEntryRequest
-	20, // 31: filer_pb.SeaweedFiler.AtomicRenameEntry:input_type -> filer_pb.AtomicRenameEntryRequest
-	22, // 32: filer_pb.SeaweedFiler.AssignVolume:input_type -> filer_pb.AssignVolumeRequest
-	24, // 33: filer_pb.SeaweedFiler.LookupVolume:input_type -> filer_pb.LookupVolumeRequest
-	29, // 34: filer_pb.SeaweedFiler.CollectionList:input_type -> filer_pb.CollectionListRequest
-	31, // 35: filer_pb.SeaweedFiler.DeleteCollection:input_type -> filer_pb.DeleteCollectionRequest
-	33, // 36: filer_pb.SeaweedFiler.Statistics:input_type -> filer_pb.StatisticsRequest
-	35, // 37: filer_pb.SeaweedFiler.GetFilerConfiguration:input_type -> filer_pb.GetFilerConfigurationRequest
-	37, // 38: filer_pb.SeaweedFiler.SubscribeMetadata:input_type -> filer_pb.SubscribeMetadataRequest
-	37, // 39: filer_pb.SeaweedFiler.SubscribeLocalMetadata:input_type -> filer_pb.SubscribeMetadataRequest
-	40, // 40: filer_pb.SeaweedFiler.KeepConnected:input_type -> filer_pb.KeepConnectedRequest
-	42, // 41: filer_pb.SeaweedFiler.LocateBroker:input_type -> filer_pb.LocateBrokerRequest
-	44, // 42: filer_pb.SeaweedFiler.KvGet:input_type -> filer_pb.KvGetRequest
-	46, // 43: filer_pb.SeaweedFiler.KvPut:input_type -> filer_pb.KvPutRequest
-	52, // 44: filer_pb.SeaweedFiler.DownloadToLocal:input_type -> filer_pb.DownloadToLocalRequest
-	1,  // 45: filer_pb.SeaweedFiler.LookupDirectoryEntry:output_type -> filer_pb.LookupDirectoryEntryResponse
-	3,  // 46: filer_pb.SeaweedFiler.ListEntries:output_type -> filer_pb.ListEntriesResponse
-	13, // 47: filer_pb.SeaweedFiler.CreateEntry:output_type -> filer_pb.CreateEntryResponse
-	15, // 48: filer_pb.SeaweedFiler.UpdateEntry:output_type -> filer_pb.UpdateEntryResponse
-	17, // 49: filer_pb.SeaweedFiler.AppendToEntry:output_type -> filer_pb.AppendToEntryResponse
-	19, // 50: filer_pb.SeaweedFiler.DeleteEntry:output_type -> filer_pb.DeleteEntryResponse
-	21, // 51: filer_pb.SeaweedFiler.AtomicRenameEntry:output_type -> filer_pb.AtomicRenameEntryResponse
-	23, // 52: filer_pb.SeaweedFiler.AssignVolume:output_type -> filer_pb.AssignVolumeResponse
-	27, // 53: filer_pb.SeaweedFiler.LookupVolume:output_type -> filer_pb.LookupVolumeResponse
-	30, // 54: filer_pb.SeaweedFiler.CollectionList:output_type -> filer_pb.CollectionListResponse
-	32, // 55: filer_pb.SeaweedFiler.DeleteCollection:output_type -> filer_pb.DeleteCollectionResponse
-	34, // 56: filer_pb.SeaweedFiler.Statistics:output_type -> filer_pb.StatisticsResponse
-	36, // 57: filer_pb.SeaweedFiler.GetFilerConfiguration:output_type -> filer_pb.GetFilerConfigurationResponse
-	38, // 58: filer_pb.SeaweedFiler.SubscribeMetadata:output_type -> filer_pb.SubscribeMetadataResponse
-	38, // 59: filer_pb.SeaweedFiler.SubscribeLocalMetadata:output_type -> filer_pb.SubscribeMetadataResponse
-	41, // 60: filer_pb.SeaweedFiler.KeepConnected:output_type -> filer_pb.KeepConnectedResponse
-	43, // 61: filer_pb.SeaweedFiler.LocateBroker:output_type -> filer_pb.LocateBrokerResponse
-	45, // 62: filer_pb.SeaweedFiler.KvGet:output_type -> filer_pb.KvGetResponse
-	47, // 63: filer_pb.SeaweedFiler.KvPut:output_type -> filer_pb.KvPutResponse
-	53, // 64: filer_pb.SeaweedFiler.DownloadToLocal:output_type -> filer_pb.DownloadToLocalResponse
-	45, // [45:65] is the sub-list for method output_type
-	25, // [25:45] is the sub-list for method input_type
-	25, // [25:25] is the sub-list for extension type_name
-	25, // [25:25] is the sub-list for extension extendee
-	0,  // [0:25] is the sub-list for field type_name
+	53, // 19: filer_pb.LocateBrokerResponse.resources:type_name -> filer_pb.LocateBrokerResponse.Resource
+	54, // 20: filer_pb.FilerConf.locations:type_name -> filer_pb.FilerConf.PathConf
+	5,  // 21: filer_pb.DownloadToLocalResponse.entry:type_name -> filer_pb.Entry
+	25, // 22: filer_pb.LookupVolumeResponse.LocationsMapEntry.value:type_name -> filer_pb.Locations
+	0,  // 23: filer_pb.SeaweedFiler.LookupDirectoryEntry:input_type -> filer_pb.LookupDirectoryEntryRequest
+	2,  // 24: filer_pb.SeaweedFiler.ListEntries:input_type -> filer_pb.ListEntriesRequest
+	12, // 25: filer_pb.SeaweedFiler.CreateEntry:input_type -> filer_pb.CreateEntryRequest
+	14, // 26: filer_pb.SeaweedFiler.UpdateEntry:input_type -> filer_pb.UpdateEntryRequest
+	16, // 27: filer_pb.SeaweedFiler.AppendToEntry:input_type -> filer_pb.AppendToEntryRequest
+	18, // 28: filer_pb.SeaweedFiler.DeleteEntry:input_type -> filer_pb.DeleteEntryRequest
+	20, // 29: filer_pb.SeaweedFiler.AtomicRenameEntry:input_type -> filer_pb.AtomicRenameEntryRequest
+	22, // 30: filer_pb.SeaweedFiler.AssignVolume:input_type -> filer_pb.AssignVolumeRequest
+	24, // 31: filer_pb.SeaweedFiler.LookupVolume:input_type -> filer_pb.LookupVolumeRequest
+	29, // 32: filer_pb.SeaweedFiler.CollectionList:input_type -> filer_pb.CollectionListRequest
+	31, // 33: filer_pb.SeaweedFiler.DeleteCollection:input_type -> filer_pb.DeleteCollectionRequest
+	33, // 34: filer_pb.SeaweedFiler.Statistics:input_type -> filer_pb.StatisticsRequest
+	35, // 35: filer_pb.SeaweedFiler.GetFilerConfiguration:input_type -> filer_pb.GetFilerConfigurationRequest
+	37, // 36: filer_pb.SeaweedFiler.SubscribeMetadata:input_type -> filer_pb.SubscribeMetadataRequest
+	37, // 37: filer_pb.SeaweedFiler.SubscribeLocalMetadata:input_type -> filer_pb.SubscribeMetadataRequest
+	40, // 38: filer_pb.SeaweedFiler.KeepConnected:input_type -> filer_pb.KeepConnectedRequest
+	42, // 39: filer_pb.SeaweedFiler.LocateBroker:input_type -> filer_pb.LocateBrokerRequest
+	44, // 40: filer_pb.SeaweedFiler.KvGet:input_type -> filer_pb.KvGetRequest
+	46, // 41: filer_pb.SeaweedFiler.KvPut:input_type -> filer_pb.KvPutRequest
+	49, // 42: filer_pb.SeaweedFiler.DownloadToLocal:input_type -> filer_pb.DownloadToLocalRequest
+	1,  // 43: filer_pb.SeaweedFiler.LookupDirectoryEntry:output_type -> filer_pb.LookupDirectoryEntryResponse
+	3,  // 44: filer_pb.SeaweedFiler.ListEntries:output_type -> filer_pb.ListEntriesResponse
+	13, // 45: filer_pb.SeaweedFiler.CreateEntry:output_type -> filer_pb.CreateEntryResponse
+	15, // 46: filer_pb.SeaweedFiler.UpdateEntry:output_type -> filer_pb.UpdateEntryResponse
+	17, // 47: filer_pb.SeaweedFiler.AppendToEntry:output_type -> filer_pb.AppendToEntryResponse
+	19, // 48: filer_pb.SeaweedFiler.DeleteEntry:output_type -> filer_pb.DeleteEntryResponse
+	21, // 49: filer_pb.SeaweedFiler.AtomicRenameEntry:output_type -> filer_pb.AtomicRenameEntryResponse
+	23, // 50: filer_pb.SeaweedFiler.AssignVolume:output_type -> filer_pb.AssignVolumeResponse
+	27, // 51: filer_pb.SeaweedFiler.LookupVolume:output_type -> filer_pb.LookupVolumeResponse
+	30, // 52: filer_pb.SeaweedFiler.CollectionList:output_type -> filer_pb.CollectionListResponse
+	32, // 53: filer_pb.SeaweedFiler.DeleteCollection:output_type -> filer_pb.DeleteCollectionResponse
+	34, // 54: filer_pb.SeaweedFiler.Statistics:output_type -> filer_pb.StatisticsResponse
+	36, // 55: filer_pb.SeaweedFiler.GetFilerConfiguration:output_type -> filer_pb.GetFilerConfigurationResponse
+	38, // 56: filer_pb.SeaweedFiler.SubscribeMetadata:output_type -> filer_pb.SubscribeMetadataResponse
+	38, // 57: filer_pb.SeaweedFiler.SubscribeLocalMetadata:output_type -> filer_pb.SubscribeMetadataResponse
+	41, // 58: filer_pb.SeaweedFiler.KeepConnected:output_type -> filer_pb.KeepConnectedResponse
+	43, // 59: filer_pb.SeaweedFiler.LocateBroker:output_type -> filer_pb.LocateBrokerResponse
+	45, // 60: filer_pb.SeaweedFiler.KvGet:output_type -> filer_pb.KvGetResponse
+	47, // 61: filer_pb.SeaweedFiler.KvPut:output_type -> filer_pb.KvPutResponse
+	50, // 62: filer_pb.SeaweedFiler.DownloadToLocal:output_type -> filer_pb.DownloadToLocalResponse
+	43, // [43:63] is the sub-list for method output_type
+	23, // [23:43] is the sub-list for method input_type
+	23, // [23:23] is the sub-list for extension type_name
+	23, // [23:23] is the sub-list for extension extendee
+	0,  // [0:23] is the sub-list for field type_name
 }
 
 func init() { file_filer_proto_init() }
@@ -4950,42 +4738,6 @@ func file_filer_proto_init() {
 			}
 		}
 		file_filer_proto_msgTypes[49].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*RemoteConf); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_filer_proto_msgTypes[50].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*RemoteStorageMapping); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_filer_proto_msgTypes[51].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*RemoteStorageLocation); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_filer_proto_msgTypes[52].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*DownloadToLocalRequest); i {
 			case 0:
 				return &v.state
@@ -4997,7 +4749,7 @@ func file_filer_proto_init() {
 				return nil
 			}
 		}
-		file_filer_proto_msgTypes[53].Exporter = func(v interface{}, i int) interface{} {
+		file_filer_proto_msgTypes[50].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*DownloadToLocalResponse); i {
 			case 0:
 				return &v.state
@@ -5009,7 +4761,7 @@ func file_filer_proto_init() {
 				return nil
 			}
 		}
-		file_filer_proto_msgTypes[56].Exporter = func(v interface{}, i int) interface{} {
+		file_filer_proto_msgTypes[53].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*LocateBrokerResponse_Resource); i {
 			case 0:
 				return &v.state
@@ -5021,7 +4773,7 @@ func file_filer_proto_init() {
 				return nil
 			}
 		}
-		file_filer_proto_msgTypes[57].Exporter = func(v interface{}, i int) interface{} {
+		file_filer_proto_msgTypes[54].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*FilerConf_PathConf); i {
 			case 0:
 				return &v.state
@@ -5040,7 +4792,7 @@ func file_filer_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_filer_proto_rawDesc,
 			NumEnums:      0,
-			NumMessages:   59,
+			NumMessages:   55,
 			NumExtensions: 0,
 			NumServices:   1,
 		},
diff --git a/weed/pb/filer_pb/filer_client.go b/weed/pb/filer_pb/filer_client.go
index b34bcabb8..6a74e3c4c 100644
--- a/weed/pb/filer_pb/filer_client.go
+++ b/weed/pb/filer_pb/filer_client.go
@@ -38,9 +38,6 @@ func GetEntry(filerClient FilerClient, fullFilePath util.FullPath) (entry *Entry
 		// glog.V(3).Infof("read %s request: %v", fullFilePath, request)
 		resp, err := LookupEntry(client, request)
 		if err != nil {
-			if err == ErrNotFound {
-				return nil
-			}
 			glog.V(3).Infof("read %s %v: %v", fullFilePath, resp, err)
 			return err
 		}
diff --git a/weed/pb/filer_pb/filer_pb_helper.go b/weed/pb/filer_pb/filer_pb_helper.go
index 7480d469a..186a5e20a 100644
--- a/weed/pb/filer_pb/filer_pb_helper.go
+++ b/weed/pb/filer_pb/filer_pb_helper.go
@@ -151,7 +151,3 @@ func (fp *FilerConf_PathConf) Key() interface{} {
 	key, _ := proto.Marshal(fp)
 	return string(key)
 }
-func (fp *RemoteStorageLocation) Key() interface{} {
-	key, _ := proto.Marshal(fp)
-	return string(key)
-}
diff --git a/weed/pb/filer_pb_tail.go b/weed/pb/filer_pb_tail.go
index 31fb62fb3..ceaaa4f6d 100644
--- a/weed/pb/filer_pb_tail.go
+++ b/weed/pb/filer_pb_tail.go
@@ -12,12 +12,12 @@ import (
 
 type ProcessMetadataFunc func(resp *filer_pb.SubscribeMetadataResponse) error
 
-func FollowMetadata(filerAddress string, grpcDialOption grpc.DialOption,
-	clientName string, pathPrefix string, lastTsNs int64, selfSignature int32,
+func FollowMetadata(filerAddress string, grpcDialOption grpc.DialOption, clientName string,
+	pathPrefix string, additionalPathPrefixes []string, lastTsNs int64, selfSignature int32,
 	processEventFn ProcessMetadataFunc, fatalOnError bool) error {
 
-	err := WithFilerClient(filerAddress, grpcDialOption, makeFunc(
-		clientName, pathPrefix, lastTsNs, selfSignature, processEventFn, fatalOnError))
+	err := WithFilerClient(filerAddress, grpcDialOption, makeFunc(clientName,
+		pathPrefix, additionalPathPrefixes, lastTsNs, selfSignature, processEventFn, fatalOnError))
 	if err != nil {
 		return fmt.Errorf("subscribing filer meta change: %v", err)
 	}
@@ -28,8 +28,8 @@ func WithFilerClientFollowMetadata(filerClient filer_pb.FilerClient,
 	clientName string, pathPrefix string, lastTsNs int64, selfSignature int32,
 	processEventFn ProcessMetadataFunc, fatalOnError bool) error {
 
-	err := filerClient.WithFilerClient(makeFunc(
-		clientName, pathPrefix, lastTsNs, selfSignature, processEventFn, fatalOnError))
+	err := filerClient.WithFilerClient(makeFunc(clientName,
+		pathPrefix, nil, lastTsNs, selfSignature, processEventFn, fatalOnError))
 	if err != nil {
 		return fmt.Errorf("subscribing filer meta change: %v", err)
 	}
@@ -37,16 +37,17 @@ func WithFilerClientFollowMetadata(filerClient filer_pb.FilerClient,
 	return nil
 }
 
-func makeFunc(clientName string, pathPrefix string, lastTsNs int64, selfSignature int32,
+func makeFunc(clientName string, pathPrefix string, additionalPathPrefixes []string, lastTsNs int64, selfSignature int32,
 	processEventFn ProcessMetadataFunc, fatalOnError bool) func(client filer_pb.SeaweedFilerClient) error {
 	return func(client filer_pb.SeaweedFilerClient) error {
 		ctx, cancel := context.WithCancel(context.Background())
 		defer cancel()
 		stream, err := client.SubscribeMetadata(ctx, &filer_pb.SubscribeMetadataRequest{
-			ClientName: clientName,
-			PathPrefix: pathPrefix,
-			SinceNs:    lastTsNs,
-			Signature:  selfSignature,
+			ClientName:   clientName,
+			PathPrefix:   pathPrefix,
+			PathPrefixes: additionalPathPrefixes,
+			SinceNs:      lastTsNs,
+			Signature:    selfSignature,
 		})
 		if err != nil {
 			return fmt.Errorf("subscribe: %v", err)
diff --git a/weed/pb/grpc_client_server.go b/weed/pb/grpc_client_server.go
index 8543df366..f296cf983 100644
--- a/weed/pb/grpc_client_server.go
+++ b/weed/pb/grpc_client_server.go
@@ -4,6 +4,7 @@ import (
 	"context"
 	"fmt"
 	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/util"
 	"math/rand"
 	"net/http"
 	"strconv"
@@ -158,7 +159,7 @@ func ParseServerAddress(server string, deltaPort int) (newServerAddress string,
 
 	newPort := int(port) + deltaPort
 
-	return fmt.Sprintf("%s:%d", host, newPort), nil
+	return util.JoinHostPort(host, newPort), nil
 }
 
 func hostAndPort(address string) (host string, port uint64, err error) {
@@ -183,7 +184,7 @@ func ServerToGrpcAddress(server string) (serverGrpcAddress string) {
 
 	grpcPort := int(port) + 10000
 
-	return fmt.Sprintf("%s:%d", host, grpcPort)
+	return util.JoinHostPort(host, grpcPort)
 }
 
 func GrpcAddressToServerAddress(grpcAddress string) (serverAddress string) {
@@ -194,7 +195,7 @@ func GrpcAddressToServerAddress(grpcAddress string) (serverAddress string) {
 
 	port := int(grpcPort) - 10000
 
-	return fmt.Sprintf("%s:%d", host, port)
+	return util.JoinHostPort(host, port)
 }
 
 func WithMasterClient(master string, grpcDialOption grpc.DialOption, fn func(client master_pb.SeaweedClient) error) error {
diff --git a/weed/pb/master.proto b/weed/pb/master.proto
index fcd5cebf1..561c5ab98 100644
--- a/weed/pb/master.proto
+++ b/weed/pb/master.proto
@@ -177,6 +177,11 @@ message AssignResponse {
     uint64 count = 4;
     string error = 5;
     string auth = 6;
+    message Replica {
+        string url = 1;
+        string public_url = 2;
+    }
+    repeated Replica replicas = 7;
 }
 
 message StatisticsRequest {
diff --git a/weed/pb/master_pb/master.pb.go b/weed/pb/master_pb/master.pb.go
index 427f3650b..4ca4b4766 100644
--- a/weed/pb/master_pb/master.pb.go
+++ b/weed/pb/master_pb/master.pb.go
@@ -1166,12 +1166,13 @@ type AssignResponse struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Fid       string `protobuf:"bytes,1,opt,name=fid,proto3" json:"fid,omitempty"`
-	Url       string `protobuf:"bytes,2,opt,name=url,proto3" json:"url,omitempty"`
-	PublicUrl string `protobuf:"bytes,3,opt,name=public_url,json=publicUrl,proto3" json:"public_url,omitempty"`
-	Count     uint64 `protobuf:"varint,4,opt,name=count,proto3" json:"count,omitempty"`
-	Error     string `protobuf:"bytes,5,opt,name=error,proto3" json:"error,omitempty"`
-	Auth      string `protobuf:"bytes,6,opt,name=auth,proto3" json:"auth,omitempty"`
+	Fid       string                    `protobuf:"bytes,1,opt,name=fid,proto3" json:"fid,omitempty"`
+	Url       string                    `protobuf:"bytes,2,opt,name=url,proto3" json:"url,omitempty"`
+	PublicUrl string                    `protobuf:"bytes,3,opt,name=public_url,json=publicUrl,proto3" json:"public_url,omitempty"`
+	Count     uint64                    `protobuf:"varint,4,opt,name=count,proto3" json:"count,omitempty"`
+	Error     string                    `protobuf:"bytes,5,opt,name=error,proto3" json:"error,omitempty"`
+	Auth      string                    `protobuf:"bytes,6,opt,name=auth,proto3" json:"auth,omitempty"`
+	Replicas  []*AssignResponse_Replica `protobuf:"bytes,7,rep,name=replicas,proto3" json:"replicas,omitempty"`
 }
 
 func (x *AssignResponse) Reset() {
@@ -1248,6 +1249,13 @@ func (x *AssignResponse) GetAuth() string {
 	return ""
 }
 
+func (x *AssignResponse) GetReplicas() []*AssignResponse_Replica {
+	if x != nil {
+		return x.Replicas
+	}
+	return nil
+}
+
 type StatisticsRequest struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -2837,6 +2845,61 @@ func (x *LookupVolumeResponse_VolumeIdLocation) GetAuth() string {
 	return ""
 }
 
+type AssignResponse_Replica struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Url       string `protobuf:"bytes,1,opt,name=url,proto3" json:"url,omitempty"`
+	PublicUrl string `protobuf:"bytes,2,opt,name=public_url,json=publicUrl,proto3" json:"public_url,omitempty"`
+}
+
+func (x *AssignResponse_Replica) Reset() {
+	*x = AssignResponse_Replica{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_master_proto_msgTypes[45]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *AssignResponse_Replica) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*AssignResponse_Replica) ProtoMessage() {}
+
+func (x *AssignResponse_Replica) ProtoReflect() protoreflect.Message {
+	mi := &file_master_proto_msgTypes[45]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use AssignResponse_Replica.ProtoReflect.Descriptor instead.
+func (*AssignResponse_Replica) Descriptor() ([]byte, []int) {
+	return file_master_proto_rawDescGZIP(), []int{14, 0}
+}
+
+func (x *AssignResponse_Replica) GetUrl() string {
+	if x != nil {
+		return x.Url
+	}
+	return ""
+}
+
+func (x *AssignResponse_Replica) GetPublicUrl() string {
+	if x != nil {
+		return x.PublicUrl
+	}
+	return ""
+}
+
 type LookupEcVolumeResponse_EcShardIdLocation struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -2849,7 +2912,7 @@ type LookupEcVolumeResponse_EcShardIdLocation struct {
 func (x *LookupEcVolumeResponse_EcShardIdLocation) Reset() {
 	*x = LookupEcVolumeResponse_EcShardIdLocation{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_master_proto_msgTypes[49]
+		mi := &file_master_proto_msgTypes[50]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2862,7 +2925,7 @@ func (x *LookupEcVolumeResponse_EcShardIdLocation) String() string {
 func (*LookupEcVolumeResponse_EcShardIdLocation) ProtoMessage() {}
 
 func (x *LookupEcVolumeResponse_EcShardIdLocation) ProtoReflect() protoreflect.Message {
-	mi := &file_master_proto_msgTypes[49]
+	mi := &file_master_proto_msgTypes[50]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -3113,8 +3176,8 @@ var file_master_proto_rawDesc = []byte{
 	0x5f, 0x63, 0x6f, 0x75, 0x6e, 0x74, 0x18, 0x09, 0x20, 0x01, 0x28, 0x0d, 0x52, 0x13, 0x57, 0x72,
 	0x69, 0x74, 0x61, 0x62, 0x6c, 0x65, 0x56, 0x6f, 0x6c, 0x75, 0x6d, 0x65, 0x43, 0x6f, 0x75, 0x6e,
 	0x74, 0x12, 0x1b, 0x0a, 0x09, 0x64, 0x69, 0x73, 0x6b, 0x5f, 0x74, 0x79, 0x70, 0x65, 0x18, 0x0a,
-	0x20, 0x01, 0x28, 0x09, 0x52, 0x08, 0x64, 0x69, 0x73, 0x6b, 0x54, 0x79, 0x70, 0x65, 0x22, 0x93,
-	0x01, 0x0a, 0x0e, 0x41, 0x73, 0x73, 0x69, 0x67, 0x6e, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73,
+	0x20, 0x01, 0x28, 0x09, 0x52, 0x08, 0x64, 0x69, 0x73, 0x6b, 0x54, 0x79, 0x70, 0x65, 0x22, 0x8e,
+	0x02, 0x0a, 0x0e, 0x41, 0x73, 0x73, 0x69, 0x67, 0x6e, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73,
 	0x65, 0x12, 0x10, 0x0a, 0x03, 0x66, 0x69, 0x64, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x03,
 	0x66, 0x69, 0x64, 0x12, 0x10, 0x0a, 0x03, 0x75, 0x72, 0x6c, 0x18, 0x02, 0x20, 0x01, 0x28, 0x09,
 	0x52, 0x03, 0x75, 0x72, 0x6c, 0x12, 0x1d, 0x0a, 0x0a, 0x70, 0x75, 0x62, 0x6c, 0x69, 0x63, 0x5f,
@@ -3123,301 +3186,308 @@ var file_master_proto_rawDesc = []byte{
 	0x01, 0x28, 0x04, 0x52, 0x05, 0x63, 0x6f, 0x75, 0x6e, 0x74, 0x12, 0x14, 0x0a, 0x05, 0x65, 0x72,
 	0x72, 0x6f, 0x72, 0x18, 0x05, 0x20, 0x01, 0x28, 0x09, 0x52, 0x05, 0x65, 0x72, 0x72, 0x6f, 0x72,
 	0x12, 0x12, 0x0a, 0x04, 0x61, 0x75, 0x74, 0x68, 0x18, 0x06, 0x20, 0x01, 0x28, 0x09, 0x52, 0x04,
-	0x61, 0x75, 0x74, 0x68, 0x22, 0x84, 0x01, 0x0a, 0x11, 0x53, 0x74, 0x61, 0x74, 0x69, 0x73, 0x74,
-	0x69, 0x63, 0x73, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x12, 0x20, 0x0a, 0x0b, 0x72, 0x65,
-	0x70, 0x6c, 0x69, 0x63, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52,
-	0x0b, 0x72, 0x65, 0x70, 0x6c, 0x69, 0x63, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x12, 0x1e, 0x0a, 0x0a,
-	0x63, 0x6f, 0x6c, 0x6c, 0x65, 0x63, 0x74, 0x69, 0x6f, 0x6e, 0x18, 0x02, 0x20, 0x01, 0x28, 0x09,
-	0x52, 0x0a, 0x63, 0x6f, 0x6c, 0x6c, 0x65, 0x63, 0x74, 0x69, 0x6f, 0x6e, 0x12, 0x10, 0x0a, 0x03,
-	0x74, 0x74, 0x6c, 0x18, 0x03, 0x20, 0x01, 0x28, 0x09, 0x52, 0x03, 0x74, 0x74, 0x6c, 0x12, 0x1b,
-	0x0a, 0x09, 0x64, 0x69, 0x73, 0x6b, 0x5f, 0x74, 0x79, 0x70, 0x65, 0x18, 0x04, 0x20, 0x01, 0x28,
-	0x09, 0x52, 0x08, 0x64, 0x69, 0x73, 0x6b, 0x54, 0x79, 0x70, 0x65, 0x22, 0x6f, 0x0a, 0x12, 0x53,
-	0x74, 0x61, 0x74, 0x69, 0x73, 0x74, 0x69, 0x63, 0x73, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73,
-	0x65, 0x12, 0x1d, 0x0a, 0x0a, 0x74, 0x6f, 0x74, 0x61, 0x6c, 0x5f, 0x73, 0x69, 0x7a, 0x65, 0x18,
-	0x04, 0x20, 0x01, 0x28, 0x04, 0x52, 0x09, 0x74, 0x6f, 0x74, 0x61, 0x6c, 0x53, 0x69, 0x7a, 0x65,
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-	0x65, 0x61, 0x77, 0x65, 0x65, 0x64, 0x66, 0x73, 0x2f, 0x77, 0x65, 0x65, 0x64, 0x2f, 0x70, 0x62,
-	0x2f, 0x6d, 0x61, 0x73, 0x74, 0x65, 0x72, 0x5f, 0x70, 0x62, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74,
-	0x6f, 0x33,
+	0x69, 0x6e, 0x54, 0x6f, 0x6b, 0x65, 0x6e, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x22,
+	0x00, 0x42, 0x32, 0x5a, 0x30, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f,
+	0x63, 0x68, 0x72, 0x69, 0x73, 0x6c, 0x75, 0x73, 0x66, 0x2f, 0x73, 0x65, 0x61, 0x77, 0x65, 0x65,
+	0x64, 0x66, 0x73, 0x2f, 0x77, 0x65, 0x65, 0x64, 0x2f, 0x70, 0x62, 0x2f, 0x6d, 0x61, 0x73, 0x74,
+	0x65, 0x72, 0x5f, 0x70, 0x62, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
@@ -3432,58 +3502,59 @@ func file_master_proto_rawDescGZIP() []byte {
 	return file_master_proto_rawDescData
 }
 
-var file_master_proto_msgTypes = make([]protoimpl.MessageInfo, 50)
+var file_master_proto_msgTypes = make([]protoimpl.MessageInfo, 51)
 var file_master_proto_goTypes = []interface{}{
-	(*Heartbeat)(nil),                             // 0: master_pb.Heartbeat
-	(*HeartbeatResponse)(nil),                     // 1: master_pb.HeartbeatResponse
-	(*VolumeInformationMessage)(nil),              // 2: master_pb.VolumeInformationMessage
-	(*VolumeShortInformationMessage)(nil),         // 3: master_pb.VolumeShortInformationMessage
-	(*VolumeEcShardInformationMessage)(nil),       // 4: master_pb.VolumeEcShardInformationMessage
-	(*StorageBackend)(nil),                        // 5: master_pb.StorageBackend
-	(*Empty)(nil),                                 // 6: master_pb.Empty
-	(*SuperBlockExtra)(nil),                       // 7: master_pb.SuperBlockExtra
-	(*KeepConnectedRequest)(nil),                  // 8: master_pb.KeepConnectedRequest
-	(*VolumeLocation)(nil),                        // 9: master_pb.VolumeLocation
-	(*LookupVolumeRequest)(nil),                   // 10: master_pb.LookupVolumeRequest
-	(*LookupVolumeResponse)(nil),                  // 11: master_pb.LookupVolumeResponse
-	(*Location)(nil),                              // 12: master_pb.Location
-	(*AssignRequest)(nil),                         // 13: master_pb.AssignRequest
-	(*AssignResponse)(nil),                        // 14: master_pb.AssignResponse
-	(*StatisticsRequest)(nil),                     // 15: master_pb.StatisticsRequest
-	(*StatisticsResponse)(nil),                    // 16: master_pb.StatisticsResponse
-	(*Collection)(nil),                            // 17: master_pb.Collection
-	(*CollectionListRequest)(nil),                 // 18: master_pb.CollectionListRequest
-	(*CollectionListResponse)(nil),                // 19: master_pb.CollectionListResponse
-	(*CollectionDeleteRequest)(nil),               // 20: master_pb.CollectionDeleteRequest
-	(*CollectionDeleteResponse)(nil),              // 21: master_pb.CollectionDeleteResponse
-	(*DiskInfo)(nil),                              // 22: master_pb.DiskInfo
-	(*DataNodeInfo)(nil),                          // 23: master_pb.DataNodeInfo
-	(*RackInfo)(nil),                              // 24: master_pb.RackInfo
-	(*DataCenterInfo)(nil),                        // 25: master_pb.DataCenterInfo
-	(*TopologyInfo)(nil),                          // 26: master_pb.TopologyInfo
-	(*VolumeListRequest)(nil),                     // 27: master_pb.VolumeListRequest
-	(*VolumeListResponse)(nil),                    // 28: master_pb.VolumeListResponse
-	(*LookupEcVolumeRequest)(nil),                 // 29: master_pb.LookupEcVolumeRequest
-	(*LookupEcVolumeResponse)(nil),                // 30: master_pb.LookupEcVolumeResponse
-	(*VacuumVolumeRequest)(nil),                   // 31: master_pb.VacuumVolumeRequest
-	(*VacuumVolumeResponse)(nil),                  // 32: master_pb.VacuumVolumeResponse
-	(*GetMasterConfigurationRequest)(nil),         // 33: master_pb.GetMasterConfigurationRequest
-	(*GetMasterConfigurationResponse)(nil),        // 34: master_pb.GetMasterConfigurationResponse
-	(*ListMasterClientsRequest)(nil),              // 35: master_pb.ListMasterClientsRequest
-	(*ListMasterClientsResponse)(nil),             // 36: master_pb.ListMasterClientsResponse
-	(*LeaseAdminTokenRequest)(nil),                // 37: master_pb.LeaseAdminTokenRequest
-	(*LeaseAdminTokenResponse)(nil),               // 38: master_pb.LeaseAdminTokenResponse
-	(*ReleaseAdminTokenRequest)(nil),              // 39: master_pb.ReleaseAdminTokenRequest
-	(*ReleaseAdminTokenResponse)(nil),             // 40: master_pb.ReleaseAdminTokenResponse
-	nil,                                           // 41: master_pb.Heartbeat.MaxVolumeCountsEntry
-	nil,                                           // 42: master_pb.StorageBackend.PropertiesEntry
-	(*SuperBlockExtra_ErasureCoding)(nil),         // 43: master_pb.SuperBlockExtra.ErasureCoding
-	(*LookupVolumeResponse_VolumeIdLocation)(nil), // 44: master_pb.LookupVolumeResponse.VolumeIdLocation
-	nil, // 45: master_pb.DataNodeInfo.DiskInfosEntry
-	nil, // 46: master_pb.RackInfo.DiskInfosEntry
-	nil, // 47: master_pb.DataCenterInfo.DiskInfosEntry
-	nil, // 48: master_pb.TopologyInfo.DiskInfosEntry
-	(*LookupEcVolumeResponse_EcShardIdLocation)(nil), // 49: master_pb.LookupEcVolumeResponse.EcShardIdLocation
+	(*Heartbeat)(nil),                                // 0: master_pb.Heartbeat
+	(*HeartbeatResponse)(nil),                        // 1: master_pb.HeartbeatResponse
+	(*VolumeInformationMessage)(nil),                 // 2: master_pb.VolumeInformationMessage
+	(*VolumeShortInformationMessage)(nil),            // 3: master_pb.VolumeShortInformationMessage
+	(*VolumeEcShardInformationMessage)(nil),          // 4: master_pb.VolumeEcShardInformationMessage
+	(*StorageBackend)(nil),                           // 5: master_pb.StorageBackend
+	(*Empty)(nil),                                    // 6: master_pb.Empty
+	(*SuperBlockExtra)(nil),                          // 7: master_pb.SuperBlockExtra
+	(*KeepConnectedRequest)(nil),                     // 8: master_pb.KeepConnectedRequest
+	(*VolumeLocation)(nil),                           // 9: master_pb.VolumeLocation
+	(*LookupVolumeRequest)(nil),                      // 10: master_pb.LookupVolumeRequest
+	(*LookupVolumeResponse)(nil),                     // 11: master_pb.LookupVolumeResponse
+	(*Location)(nil),                                 // 12: master_pb.Location
+	(*AssignRequest)(nil),                            // 13: master_pb.AssignRequest
+	(*AssignResponse)(nil),                           // 14: master_pb.AssignResponse
+	(*StatisticsRequest)(nil),                        // 15: master_pb.StatisticsRequest
+	(*StatisticsResponse)(nil),                       // 16: master_pb.StatisticsResponse
+	(*Collection)(nil),                               // 17: master_pb.Collection
+	(*CollectionListRequest)(nil),                    // 18: master_pb.CollectionListRequest
+	(*CollectionListResponse)(nil),                   // 19: master_pb.CollectionListResponse
+	(*CollectionDeleteRequest)(nil),                  // 20: master_pb.CollectionDeleteRequest
+	(*CollectionDeleteResponse)(nil),                 // 21: master_pb.CollectionDeleteResponse
+	(*DiskInfo)(nil),                                 // 22: master_pb.DiskInfo
+	(*DataNodeInfo)(nil),                             // 23: master_pb.DataNodeInfo
+	(*RackInfo)(nil),                                 // 24: master_pb.RackInfo
+	(*DataCenterInfo)(nil),                           // 25: master_pb.DataCenterInfo
+	(*TopologyInfo)(nil),                             // 26: master_pb.TopologyInfo
+	(*VolumeListRequest)(nil),                        // 27: master_pb.VolumeListRequest
+	(*VolumeListResponse)(nil),                       // 28: master_pb.VolumeListResponse
+	(*LookupEcVolumeRequest)(nil),                    // 29: master_pb.LookupEcVolumeRequest
+	(*LookupEcVolumeResponse)(nil),                   // 30: master_pb.LookupEcVolumeResponse
+	(*VacuumVolumeRequest)(nil),                      // 31: master_pb.VacuumVolumeRequest
+	(*VacuumVolumeResponse)(nil),                     // 32: master_pb.VacuumVolumeResponse
+	(*GetMasterConfigurationRequest)(nil),            // 33: master_pb.GetMasterConfigurationRequest
+	(*GetMasterConfigurationResponse)(nil),           // 34: master_pb.GetMasterConfigurationResponse
+	(*ListMasterClientsRequest)(nil),                 // 35: master_pb.ListMasterClientsRequest
+	(*ListMasterClientsResponse)(nil),                // 36: master_pb.ListMasterClientsResponse
+	(*LeaseAdminTokenRequest)(nil),                   // 37: master_pb.LeaseAdminTokenRequest
+	(*LeaseAdminTokenResponse)(nil),                  // 38: master_pb.LeaseAdminTokenResponse
+	(*ReleaseAdminTokenRequest)(nil),                 // 39: master_pb.ReleaseAdminTokenRequest
+	(*ReleaseAdminTokenResponse)(nil),                // 40: master_pb.ReleaseAdminTokenResponse
+	nil,                                              // 41: master_pb.Heartbeat.MaxVolumeCountsEntry
+	nil,                                              // 42: master_pb.StorageBackend.PropertiesEntry
+	(*SuperBlockExtra_ErasureCoding)(nil),            // 43: master_pb.SuperBlockExtra.ErasureCoding
+	(*LookupVolumeResponse_VolumeIdLocation)(nil),    // 44: master_pb.LookupVolumeResponse.VolumeIdLocation
+	(*AssignResponse_Replica)(nil),                   // 45: master_pb.AssignResponse.Replica
+	nil,                                              // 46: master_pb.DataNodeInfo.DiskInfosEntry
+	nil,                                              // 47: master_pb.RackInfo.DiskInfosEntry
+	nil,                                              // 48: master_pb.DataCenterInfo.DiskInfosEntry
+	nil,                                              // 49: master_pb.TopologyInfo.DiskInfosEntry
+	(*LookupEcVolumeResponse_EcShardIdLocation)(nil), // 50: master_pb.LookupEcVolumeResponse.EcShardIdLocation
 }
 var file_master_proto_depIdxs = []int32{
 	2,  // 0: master_pb.Heartbeat.volumes:type_name -> master_pb.VolumeInformationMessage
@@ -3497,58 +3568,59 @@ var file_master_proto_depIdxs = []int32{
 	42, // 8: master_pb.StorageBackend.properties:type_name -> master_pb.StorageBackend.PropertiesEntry
 	43, // 9: master_pb.SuperBlockExtra.erasure_coding:type_name -> master_pb.SuperBlockExtra.ErasureCoding
 	44, // 10: master_pb.LookupVolumeResponse.volume_id_locations:type_name -> master_pb.LookupVolumeResponse.VolumeIdLocation
-	17, // 11: master_pb.CollectionListResponse.collections:type_name -> master_pb.Collection
-	2,  // 12: master_pb.DiskInfo.volume_infos:type_name -> master_pb.VolumeInformationMessage
-	4,  // 13: master_pb.DiskInfo.ec_shard_infos:type_name -> master_pb.VolumeEcShardInformationMessage
-	45, // 14: master_pb.DataNodeInfo.diskInfos:type_name -> master_pb.DataNodeInfo.DiskInfosEntry
-	23, // 15: master_pb.RackInfo.data_node_infos:type_name -> master_pb.DataNodeInfo
-	46, // 16: master_pb.RackInfo.diskInfos:type_name -> master_pb.RackInfo.DiskInfosEntry
-	24, // 17: master_pb.DataCenterInfo.rack_infos:type_name -> master_pb.RackInfo
-	47, // 18: master_pb.DataCenterInfo.diskInfos:type_name -> master_pb.DataCenterInfo.DiskInfosEntry
-	25, // 19: master_pb.TopologyInfo.data_center_infos:type_name -> master_pb.DataCenterInfo
-	48, // 20: master_pb.TopologyInfo.diskInfos:type_name -> master_pb.TopologyInfo.DiskInfosEntry
-	26, // 21: master_pb.VolumeListResponse.topology_info:type_name -> master_pb.TopologyInfo
-	49, // 22: master_pb.LookupEcVolumeResponse.shard_id_locations:type_name -> master_pb.LookupEcVolumeResponse.EcShardIdLocation
-	5,  // 23: master_pb.GetMasterConfigurationResponse.storage_backends:type_name -> master_pb.StorageBackend
-	12, // 24: master_pb.LookupVolumeResponse.VolumeIdLocation.locations:type_name -> master_pb.Location
-	22, // 25: master_pb.DataNodeInfo.DiskInfosEntry.value:type_name -> master_pb.DiskInfo
-	22, // 26: master_pb.RackInfo.DiskInfosEntry.value:type_name -> master_pb.DiskInfo
-	22, // 27: master_pb.DataCenterInfo.DiskInfosEntry.value:type_name -> master_pb.DiskInfo
-	22, // 28: master_pb.TopologyInfo.DiskInfosEntry.value:type_name -> master_pb.DiskInfo
-	12, // 29: master_pb.LookupEcVolumeResponse.EcShardIdLocation.locations:type_name -> master_pb.Location
-	0,  // 30: master_pb.Seaweed.SendHeartbeat:input_type -> master_pb.Heartbeat
-	8,  // 31: master_pb.Seaweed.KeepConnected:input_type -> master_pb.KeepConnectedRequest
-	10, // 32: master_pb.Seaweed.LookupVolume:input_type -> master_pb.LookupVolumeRequest
-	13, // 33: master_pb.Seaweed.Assign:input_type -> master_pb.AssignRequest
-	15, // 34: master_pb.Seaweed.Statistics:input_type -> master_pb.StatisticsRequest
-	18, // 35: master_pb.Seaweed.CollectionList:input_type -> master_pb.CollectionListRequest
-	20, // 36: master_pb.Seaweed.CollectionDelete:input_type -> master_pb.CollectionDeleteRequest
-	27, // 37: master_pb.Seaweed.VolumeList:input_type -> master_pb.VolumeListRequest
-	29, // 38: master_pb.Seaweed.LookupEcVolume:input_type -> master_pb.LookupEcVolumeRequest
-	31, // 39: master_pb.Seaweed.VacuumVolume:input_type -> master_pb.VacuumVolumeRequest
-	33, // 40: master_pb.Seaweed.GetMasterConfiguration:input_type -> master_pb.GetMasterConfigurationRequest
-	35, // 41: master_pb.Seaweed.ListMasterClients:input_type -> master_pb.ListMasterClientsRequest
-	37, // 42: master_pb.Seaweed.LeaseAdminToken:input_type -> master_pb.LeaseAdminTokenRequest
-	39, // 43: master_pb.Seaweed.ReleaseAdminToken:input_type -> master_pb.ReleaseAdminTokenRequest
-	1,  // 44: master_pb.Seaweed.SendHeartbeat:output_type -> master_pb.HeartbeatResponse
-	9,  // 45: master_pb.Seaweed.KeepConnected:output_type -> master_pb.VolumeLocation
-	11, // 46: master_pb.Seaweed.LookupVolume:output_type -> master_pb.LookupVolumeResponse
-	14, // 47: master_pb.Seaweed.Assign:output_type -> master_pb.AssignResponse
-	16, // 48: master_pb.Seaweed.Statistics:output_type -> master_pb.StatisticsResponse
-	19, // 49: master_pb.Seaweed.CollectionList:output_type -> master_pb.CollectionListResponse
-	21, // 50: master_pb.Seaweed.CollectionDelete:output_type -> master_pb.CollectionDeleteResponse
-	28, // 51: master_pb.Seaweed.VolumeList:output_type -> master_pb.VolumeListResponse
-	30, // 52: master_pb.Seaweed.LookupEcVolume:output_type -> master_pb.LookupEcVolumeResponse
-	32, // 53: master_pb.Seaweed.VacuumVolume:output_type -> master_pb.VacuumVolumeResponse
-	34, // 54: master_pb.Seaweed.GetMasterConfiguration:output_type -> master_pb.GetMasterConfigurationResponse
-	36, // 55: master_pb.Seaweed.ListMasterClients:output_type -> master_pb.ListMasterClientsResponse
-	38, // 56: master_pb.Seaweed.LeaseAdminToken:output_type -> master_pb.LeaseAdminTokenResponse
-	40, // 57: master_pb.Seaweed.ReleaseAdminToken:output_type -> master_pb.ReleaseAdminTokenResponse
-	44, // [44:58] is the sub-list for method output_type
-	30, // [30:44] is the sub-list for method input_type
-	30, // [30:30] is the sub-list for extension type_name
-	30, // [30:30] is the sub-list for extension extendee
-	0,  // [0:30] is the sub-list for field type_name
+	45, // 11: master_pb.AssignResponse.replicas:type_name -> master_pb.AssignResponse.Replica
+	17, // 12: master_pb.CollectionListResponse.collections:type_name -> master_pb.Collection
+	2,  // 13: master_pb.DiskInfo.volume_infos:type_name -> master_pb.VolumeInformationMessage
+	4,  // 14: master_pb.DiskInfo.ec_shard_infos:type_name -> master_pb.VolumeEcShardInformationMessage
+	46, // 15: master_pb.DataNodeInfo.diskInfos:type_name -> master_pb.DataNodeInfo.DiskInfosEntry
+	23, // 16: master_pb.RackInfo.data_node_infos:type_name -> master_pb.DataNodeInfo
+	47, // 17: master_pb.RackInfo.diskInfos:type_name -> master_pb.RackInfo.DiskInfosEntry
+	24, // 18: master_pb.DataCenterInfo.rack_infos:type_name -> master_pb.RackInfo
+	48, // 19: master_pb.DataCenterInfo.diskInfos:type_name -> master_pb.DataCenterInfo.DiskInfosEntry
+	25, // 20: master_pb.TopologyInfo.data_center_infos:type_name -> master_pb.DataCenterInfo
+	49, // 21: master_pb.TopologyInfo.diskInfos:type_name -> master_pb.TopologyInfo.DiskInfosEntry
+	26, // 22: master_pb.VolumeListResponse.topology_info:type_name -> master_pb.TopologyInfo
+	50, // 23: master_pb.LookupEcVolumeResponse.shard_id_locations:type_name -> master_pb.LookupEcVolumeResponse.EcShardIdLocation
+	5,  // 24: master_pb.GetMasterConfigurationResponse.storage_backends:type_name -> master_pb.StorageBackend
+	12, // 25: master_pb.LookupVolumeResponse.VolumeIdLocation.locations:type_name -> master_pb.Location
+	22, // 26: master_pb.DataNodeInfo.DiskInfosEntry.value:type_name -> master_pb.DiskInfo
+	22, // 27: master_pb.RackInfo.DiskInfosEntry.value:type_name -> master_pb.DiskInfo
+	22, // 28: master_pb.DataCenterInfo.DiskInfosEntry.value:type_name -> master_pb.DiskInfo
+	22, // 29: master_pb.TopologyInfo.DiskInfosEntry.value:type_name -> master_pb.DiskInfo
+	12, // 30: master_pb.LookupEcVolumeResponse.EcShardIdLocation.locations:type_name -> master_pb.Location
+	0,  // 31: master_pb.Seaweed.SendHeartbeat:input_type -> master_pb.Heartbeat
+	8,  // 32: master_pb.Seaweed.KeepConnected:input_type -> master_pb.KeepConnectedRequest
+	10, // 33: master_pb.Seaweed.LookupVolume:input_type -> master_pb.LookupVolumeRequest
+	13, // 34: master_pb.Seaweed.Assign:input_type -> master_pb.AssignRequest
+	15, // 35: master_pb.Seaweed.Statistics:input_type -> master_pb.StatisticsRequest
+	18, // 36: master_pb.Seaweed.CollectionList:input_type -> master_pb.CollectionListRequest
+	20, // 37: master_pb.Seaweed.CollectionDelete:input_type -> master_pb.CollectionDeleteRequest
+	27, // 38: master_pb.Seaweed.VolumeList:input_type -> master_pb.VolumeListRequest
+	29, // 39: master_pb.Seaweed.LookupEcVolume:input_type -> master_pb.LookupEcVolumeRequest
+	31, // 40: master_pb.Seaweed.VacuumVolume:input_type -> master_pb.VacuumVolumeRequest
+	33, // 41: master_pb.Seaweed.GetMasterConfiguration:input_type -> master_pb.GetMasterConfigurationRequest
+	35, // 42: master_pb.Seaweed.ListMasterClients:input_type -> master_pb.ListMasterClientsRequest
+	37, // 43: master_pb.Seaweed.LeaseAdminToken:input_type -> master_pb.LeaseAdminTokenRequest
+	39, // 44: master_pb.Seaweed.ReleaseAdminToken:input_type -> master_pb.ReleaseAdminTokenRequest
+	1,  // 45: master_pb.Seaweed.SendHeartbeat:output_type -> master_pb.HeartbeatResponse
+	9,  // 46: master_pb.Seaweed.KeepConnected:output_type -> master_pb.VolumeLocation
+	11, // 47: master_pb.Seaweed.LookupVolume:output_type -> master_pb.LookupVolumeResponse
+	14, // 48: master_pb.Seaweed.Assign:output_type -> master_pb.AssignResponse
+	16, // 49: master_pb.Seaweed.Statistics:output_type -> master_pb.StatisticsResponse
+	19, // 50: master_pb.Seaweed.CollectionList:output_type -> master_pb.CollectionListResponse
+	21, // 51: master_pb.Seaweed.CollectionDelete:output_type -> master_pb.CollectionDeleteResponse
+	28, // 52: master_pb.Seaweed.VolumeList:output_type -> master_pb.VolumeListResponse
+	30, // 53: master_pb.Seaweed.LookupEcVolume:output_type -> master_pb.LookupEcVolumeResponse
+	32, // 54: master_pb.Seaweed.VacuumVolume:output_type -> master_pb.VacuumVolumeResponse
+	34, // 55: master_pb.Seaweed.GetMasterConfiguration:output_type -> master_pb.GetMasterConfigurationResponse
+	36, // 56: master_pb.Seaweed.ListMasterClients:output_type -> master_pb.ListMasterClientsResponse
+	38, // 57: master_pb.Seaweed.LeaseAdminToken:output_type -> master_pb.LeaseAdminTokenResponse
+	40, // 58: master_pb.Seaweed.ReleaseAdminToken:output_type -> master_pb.ReleaseAdminTokenResponse
+	45, // [45:59] is the sub-list for method output_type
+	31, // [31:45] is the sub-list for method input_type
+	31, // [31:31] is the sub-list for extension type_name
+	31, // [31:31] is the sub-list for extension extendee
+	0,  // [0:31] is the sub-list for field type_name
 }
 
 func init() { file_master_proto_init() }
@@ -4073,7 +4145,19 @@ func file_master_proto_init() {
 				return nil
 			}
 		}
-		file_master_proto_msgTypes[49].Exporter = func(v interface{}, i int) interface{} {
+		file_master_proto_msgTypes[45].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*AssignResponse_Replica); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_master_proto_msgTypes[50].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*LookupEcVolumeResponse_EcShardIdLocation); i {
 			case 0:
 				return &v.state
@@ -4092,7 +4176,7 @@ func file_master_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_master_proto_rawDesc,
 			NumEnums:      0,
-			NumMessages:   50,
+			NumMessages:   51,
 			NumExtensions: 0,
 			NumServices:   1,
 		},
diff --git a/weed/pb/remote.proto b/weed/pb/remote.proto
new file mode 100644
index 000000000..65722c9ae
--- /dev/null
+++ b/weed/pb/remote.proto
@@ -0,0 +1,75 @@
+syntax = "proto3";
+
+package remote_pb;
+
+option go_package = "github.com/chrislusf/seaweedfs/weed/pb/remote_pb";
+option java_package = "seaweedfs.client";
+option java_outer_classname = "FilerProto";
+
+/////////////////////////
+// Remote Storage related
+/////////////////////////
+message RemoteConf {
+  string type = 1;
+  string name = 2;
+  string s3_access_key = 4;
+  string s3_secret_key = 5;
+  string s3_region = 6;
+  string s3_endpoint = 7;
+  string s3_storage_class = 8;
+  bool s3_force_path_style = 9;
+  bool s3_v4_signature = 11;
+
+  string gcs_google_application_credentials = 10;
+  string gcs_project_id = 12;
+
+  string azure_account_name = 15;
+  string azure_account_key = 16;
+
+  string backblaze_key_id = 20;
+  string backblaze_application_key = 21;
+  string backblaze_endpoint = 22;
+
+  string aliyun_access_key = 25;
+  string aliyun_secret_key = 26;
+  string aliyun_endpoint = 27;
+  string aliyun_region = 28;
+
+  string tencent_secret_id = 30;
+  string tencent_secret_key = 31;
+  string tencent_endpoint = 32;
+
+  string baidu_access_key = 35;
+  string baidu_secret_key = 36;
+  string baidu_endpoint = 37;
+  string baidu_region = 38;
+
+  string wasabi_access_key = 40;
+  string wasabi_secret_key = 41;
+  string wasabi_endpoint = 42;
+  string wasabi_region = 43;
+
+  repeated string hdfs_namenodes = 50;
+  string hdfs_username = 51;
+  string hdfs_service_principal_name = 52;
+  string hdfs_data_transfer_protection = 53;
+
+  string filebase_access_key = 60;
+  string filebase_secret_key = 61;
+  string filebase_endpoint = 62;
+
+  string storj_access_key = 65;
+  string storj_secret_key = 66;
+  string storj_endpoint = 67;
+
+}
+
+message RemoteStorageMapping {
+  map<string,RemoteStorageLocation> mappings = 1;
+  string primary_bucket_storage_name = 2;
+}
+message RemoteStorageLocation {
+  string name = 1;
+  string bucket = 2;
+  string path = 3;
+}
diff --git a/weed/pb/remote_pb/remote.pb.go b/weed/pb/remote_pb/remote.pb.go
new file mode 100644
index 000000000..fef9556fe
--- /dev/null
+++ b/weed/pb/remote_pb/remote.pb.go
@@ -0,0 +1,751 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.25.0
+// 	protoc        v3.12.3
+// source: remote.proto
+
+package remote_pb
+
+import (
+	proto "github.com/golang/protobuf/proto"
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+)
+
+const (
+	// Verify that this generated code is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
+	// Verify that runtime/protoimpl is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
+)
+
+// This is a compile-time assertion that a sufficiently up-to-date version
+// of the legacy proto package is being used.
+const _ = proto.ProtoPackageIsVersion4
+
+/////////////////////////
+// Remote Storage related
+/////////////////////////
+type RemoteConf struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Type                            string   `protobuf:"bytes,1,opt,name=type,proto3" json:"type,omitempty"`
+	Name                            string   `protobuf:"bytes,2,opt,name=name,proto3" json:"name,omitempty"`
+	S3AccessKey                     string   `protobuf:"bytes,4,opt,name=s3_access_key,json=s3AccessKey,proto3" json:"s3_access_key,omitempty"`
+	S3SecretKey                     string   `protobuf:"bytes,5,opt,name=s3_secret_key,json=s3SecretKey,proto3" json:"s3_secret_key,omitempty"`
+	S3Region                        string   `protobuf:"bytes,6,opt,name=s3_region,json=s3Region,proto3" json:"s3_region,omitempty"`
+	S3Endpoint                      string   `protobuf:"bytes,7,opt,name=s3_endpoint,json=s3Endpoint,proto3" json:"s3_endpoint,omitempty"`
+	S3StorageClass                  string   `protobuf:"bytes,8,opt,name=s3_storage_class,json=s3StorageClass,proto3" json:"s3_storage_class,omitempty"`
+	S3ForcePathStyle                bool     `protobuf:"varint,9,opt,name=s3_force_path_style,json=s3ForcePathStyle,proto3" json:"s3_force_path_style,omitempty"`
+	S3V4Signature                   bool     `protobuf:"varint,11,opt,name=s3_v4_signature,json=s3V4Signature,proto3" json:"s3_v4_signature,omitempty"`
+	GcsGoogleApplicationCredentials string   `protobuf:"bytes,10,opt,name=gcs_google_application_credentials,json=gcsGoogleApplicationCredentials,proto3" json:"gcs_google_application_credentials,omitempty"`
+	GcsProjectId                    string   `protobuf:"bytes,12,opt,name=gcs_project_id,json=gcsProjectId,proto3" json:"gcs_project_id,omitempty"`
+	AzureAccountName                string   `protobuf:"bytes,15,opt,name=azure_account_name,json=azureAccountName,proto3" json:"azure_account_name,omitempty"`
+	AzureAccountKey                 string   `protobuf:"bytes,16,opt,name=azure_account_key,json=azureAccountKey,proto3" json:"azure_account_key,omitempty"`
+	BackblazeKeyId                  string   `protobuf:"bytes,20,opt,name=backblaze_key_id,json=backblazeKeyId,proto3" json:"backblaze_key_id,omitempty"`
+	BackblazeApplicationKey         string   `protobuf:"bytes,21,opt,name=backblaze_application_key,json=backblazeApplicationKey,proto3" json:"backblaze_application_key,omitempty"`
+	BackblazeEndpoint               string   `protobuf:"bytes,22,opt,name=backblaze_endpoint,json=backblazeEndpoint,proto3" json:"backblaze_endpoint,omitempty"`
+	AliyunAccessKey                 string   `protobuf:"bytes,25,opt,name=aliyun_access_key,json=aliyunAccessKey,proto3" json:"aliyun_access_key,omitempty"`
+	AliyunSecretKey                 string   `protobuf:"bytes,26,opt,name=aliyun_secret_key,json=aliyunSecretKey,proto3" json:"aliyun_secret_key,omitempty"`
+	AliyunEndpoint                  string   `protobuf:"bytes,27,opt,name=aliyun_endpoint,json=aliyunEndpoint,proto3" json:"aliyun_endpoint,omitempty"`
+	AliyunRegion                    string   `protobuf:"bytes,28,opt,name=aliyun_region,json=aliyunRegion,proto3" json:"aliyun_region,omitempty"`
+	TencentSecretId                 string   `protobuf:"bytes,30,opt,name=tencent_secret_id,json=tencentSecretId,proto3" json:"tencent_secret_id,omitempty"`
+	TencentSecretKey                string   `protobuf:"bytes,31,opt,name=tencent_secret_key,json=tencentSecretKey,proto3" json:"tencent_secret_key,omitempty"`
+	TencentEndpoint                 string   `protobuf:"bytes,32,opt,name=tencent_endpoint,json=tencentEndpoint,proto3" json:"tencent_endpoint,omitempty"`
+	BaiduAccessKey                  string   `protobuf:"bytes,35,opt,name=baidu_access_key,json=baiduAccessKey,proto3" json:"baidu_access_key,omitempty"`
+	BaiduSecretKey                  string   `protobuf:"bytes,36,opt,name=baidu_secret_key,json=baiduSecretKey,proto3" json:"baidu_secret_key,omitempty"`
+	BaiduEndpoint                   string   `protobuf:"bytes,37,opt,name=baidu_endpoint,json=baiduEndpoint,proto3" json:"baidu_endpoint,omitempty"`
+	BaiduRegion                     string   `protobuf:"bytes,38,opt,name=baidu_region,json=baiduRegion,proto3" json:"baidu_region,omitempty"`
+	WasabiAccessKey                 string   `protobuf:"bytes,40,opt,name=wasabi_access_key,json=wasabiAccessKey,proto3" json:"wasabi_access_key,omitempty"`
+	WasabiSecretKey                 string   `protobuf:"bytes,41,opt,name=wasabi_secret_key,json=wasabiSecretKey,proto3" json:"wasabi_secret_key,omitempty"`
+	WasabiEndpoint                  string   `protobuf:"bytes,42,opt,name=wasabi_endpoint,json=wasabiEndpoint,proto3" json:"wasabi_endpoint,omitempty"`
+	WasabiRegion                    string   `protobuf:"bytes,43,opt,name=wasabi_region,json=wasabiRegion,proto3" json:"wasabi_region,omitempty"`
+	HdfsNamenodes                   []string `protobuf:"bytes,50,rep,name=hdfs_namenodes,json=hdfsNamenodes,proto3" json:"hdfs_namenodes,omitempty"`
+	HdfsUsername                    string   `protobuf:"bytes,51,opt,name=hdfs_username,json=hdfsUsername,proto3" json:"hdfs_username,omitempty"`
+	HdfsServicePrincipalName        string   `protobuf:"bytes,52,opt,name=hdfs_service_principal_name,json=hdfsServicePrincipalName,proto3" json:"hdfs_service_principal_name,omitempty"`
+	HdfsDataTransferProtection      string   `protobuf:"bytes,53,opt,name=hdfs_data_transfer_protection,json=hdfsDataTransferProtection,proto3" json:"hdfs_data_transfer_protection,omitempty"`
+	FilebaseAccessKey               string   `protobuf:"bytes,60,opt,name=filebase_access_key,json=filebaseAccessKey,proto3" json:"filebase_access_key,omitempty"`
+	FilebaseSecretKey               string   `protobuf:"bytes,61,opt,name=filebase_secret_key,json=filebaseSecretKey,proto3" json:"filebase_secret_key,omitempty"`
+	FilebaseEndpoint                string   `protobuf:"bytes,62,opt,name=filebase_endpoint,json=filebaseEndpoint,proto3" json:"filebase_endpoint,omitempty"`
+	StorjAccessKey                  string   `protobuf:"bytes,65,opt,name=storj_access_key,json=storjAccessKey,proto3" json:"storj_access_key,omitempty"`
+	StorjSecretKey                  string   `protobuf:"bytes,66,opt,name=storj_secret_key,json=storjSecretKey,proto3" json:"storj_secret_key,omitempty"`
+	StorjEndpoint                   string   `protobuf:"bytes,67,opt,name=storj_endpoint,json=storjEndpoint,proto3" json:"storj_endpoint,omitempty"`
+}
+
+func (x *RemoteConf) Reset() {
+	*x = RemoteConf{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_remote_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *RemoteConf) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*RemoteConf) ProtoMessage() {}
+
+func (x *RemoteConf) ProtoReflect() protoreflect.Message {
+	mi := &file_remote_proto_msgTypes[0]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use RemoteConf.ProtoReflect.Descriptor instead.
+func (*RemoteConf) Descriptor() ([]byte, []int) {
+	return file_remote_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *RemoteConf) GetType() string {
+	if x != nil {
+		return x.Type
+	}
+	return ""
+}
+
+func (x *RemoteConf) GetName() string {
+	if x != nil {
+		return x.Name
+	}
+	return ""
+}
+
+func (x *RemoteConf) GetS3AccessKey() string {
+	if x != nil {
+		return x.S3AccessKey
+	}
+	return ""
+}
+
+func (x *RemoteConf) GetS3SecretKey() string {
+	if x != nil {
+		return x.S3SecretKey
+	}
+	return ""
+}
+
+func (x *RemoteConf) GetS3Region() string {
+	if x != nil {
+		return x.S3Region
+	}
+	return ""
+}
+
+func (x *RemoteConf) GetS3Endpoint() string {
+	if x != nil {
+		return x.S3Endpoint
+	}
+	return ""
+}
+
+func (x *RemoteConf) GetS3StorageClass() string {
+	if x != nil {
+		return x.S3StorageClass
+	}
+	return ""
+}
+
+func (x *RemoteConf) GetS3ForcePathStyle() bool {
+	if x != nil {
+		return x.S3ForcePathStyle
+	}
+	return false
+}
+
+func (x *RemoteConf) GetS3V4Signature() bool {
+	if x != nil {
+		return x.S3V4Signature
+	}
+	return false
+}
+
+func (x *RemoteConf) GetGcsGoogleApplicationCredentials() string {
+	if x != nil {
+		return x.GcsGoogleApplicationCredentials
+	}
+	return ""
+}
+
+func (x *RemoteConf) GetGcsProjectId() string {
+	if x != nil {
+		return x.GcsProjectId
+	}
+	return ""
+}
+
+func (x *RemoteConf) GetAzureAccountName() string {
+	if x != nil {
+		return x.AzureAccountName
+	}
+	return ""
+}
+
+func (x *RemoteConf) GetAzureAccountKey() string {
+	if x != nil {
+		return x.AzureAccountKey
+	}
+	return ""
+}
+
+func (x *RemoteConf) GetBackblazeKeyId() string {
+	if x != nil {
+		return x.BackblazeKeyId
+	}
+	return ""
+}
+
+func (x *RemoteConf) GetBackblazeApplicationKey() string {
+	if x != nil {
+		return x.BackblazeApplicationKey
+	}
+	return ""
+}
+
+func (x *RemoteConf) GetBackblazeEndpoint() string {
+	if x != nil {
+		return x.BackblazeEndpoint
+	}
+	return ""
+}
+
+func (x *RemoteConf) GetAliyunAccessKey() string {
+	if x != nil {
+		return x.AliyunAccessKey
+	}
+	return ""
+}
+
+func (x *RemoteConf) GetAliyunSecretKey() string {
+	if x != nil {
+		return x.AliyunSecretKey
+	}
+	return ""
+}
+
+func (x *RemoteConf) GetAliyunEndpoint() string {
+	if x != nil {
+		return x.AliyunEndpoint
+	}
+	return ""
+}
+
+func (x *RemoteConf) GetAliyunRegion() string {
+	if x != nil {
+		return x.AliyunRegion
+	}
+	return ""
+}
+
+func (x *RemoteConf) GetTencentSecretId() string {
+	if x != nil {
+		return x.TencentSecretId
+	}
+	return ""
+}
+
+func (x *RemoteConf) GetTencentSecretKey() string {
+	if x != nil {
+		return x.TencentSecretKey
+	}
+	return ""
+}
+
+func (x *RemoteConf) GetTencentEndpoint() string {
+	if x != nil {
+		return x.TencentEndpoint
+	}
+	return ""
+}
+
+func (x *RemoteConf) GetBaiduAccessKey() string {
+	if x != nil {
+		return x.BaiduAccessKey
+	}
+	return ""
+}
+
+func (x *RemoteConf) GetBaiduSecretKey() string {
+	if x != nil {
+		return x.BaiduSecretKey
+	}
+	return ""
+}
+
+func (x *RemoteConf) GetBaiduEndpoint() string {
+	if x != nil {
+		return x.BaiduEndpoint
+	}
+	return ""
+}
+
+func (x *RemoteConf) GetBaiduRegion() string {
+	if x != nil {
+		return x.BaiduRegion
+	}
+	return ""
+}
+
+func (x *RemoteConf) GetWasabiAccessKey() string {
+	if x != nil {
+		return x.WasabiAccessKey
+	}
+	return ""
+}
+
+func (x *RemoteConf) GetWasabiSecretKey() string {
+	if x != nil {
+		return x.WasabiSecretKey
+	}
+	return ""
+}
+
+func (x *RemoteConf) GetWasabiEndpoint() string {
+	if x != nil {
+		return x.WasabiEndpoint
+	}
+	return ""
+}
+
+func (x *RemoteConf) GetWasabiRegion() string {
+	if x != nil {
+		return x.WasabiRegion
+	}
+	return ""
+}
+
+func (x *RemoteConf) GetHdfsNamenodes() []string {
+	if x != nil {
+		return x.HdfsNamenodes
+	}
+	return nil
+}
+
+func (x *RemoteConf) GetHdfsUsername() string {
+	if x != nil {
+		return x.HdfsUsername
+	}
+	return ""
+}
+
+func (x *RemoteConf) GetHdfsServicePrincipalName() string {
+	if x != nil {
+		return x.HdfsServicePrincipalName
+	}
+	return ""
+}
+
+func (x *RemoteConf) GetHdfsDataTransferProtection() string {
+	if x != nil {
+		return x.HdfsDataTransferProtection
+	}
+	return ""
+}
+
+func (x *RemoteConf) GetFilebaseAccessKey() string {
+	if x != nil {
+		return x.FilebaseAccessKey
+	}
+	return ""
+}
+
+func (x *RemoteConf) GetFilebaseSecretKey() string {
+	if x != nil {
+		return x.FilebaseSecretKey
+	}
+	return ""
+}
+
+func (x *RemoteConf) GetFilebaseEndpoint() string {
+	if x != nil {
+		return x.FilebaseEndpoint
+	}
+	return ""
+}
+
+func (x *RemoteConf) GetStorjAccessKey() string {
+	if x != nil {
+		return x.StorjAccessKey
+	}
+	return ""
+}
+
+func (x *RemoteConf) GetStorjSecretKey() string {
+	if x != nil {
+		return x.StorjSecretKey
+	}
+	return ""
+}
+
+func (x *RemoteConf) GetStorjEndpoint() string {
+	if x != nil {
+		return x.StorjEndpoint
+	}
+	return ""
+}
+
+type RemoteStorageMapping struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Mappings                 map[string]*RemoteStorageLocation `protobuf:"bytes,1,rep,name=mappings,proto3" json:"mappings,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	PrimaryBucketStorageName string                            `protobuf:"bytes,2,opt,name=primary_bucket_storage_name,json=primaryBucketStorageName,proto3" json:"primary_bucket_storage_name,omitempty"`
+}
+
+func (x *RemoteStorageMapping) Reset() {
+	*x = RemoteStorageMapping{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_remote_proto_msgTypes[1]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *RemoteStorageMapping) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*RemoteStorageMapping) ProtoMessage() {}
+
+func (x *RemoteStorageMapping) ProtoReflect() protoreflect.Message {
+	mi := &file_remote_proto_msgTypes[1]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use RemoteStorageMapping.ProtoReflect.Descriptor instead.
+func (*RemoteStorageMapping) Descriptor() ([]byte, []int) {
+	return file_remote_proto_rawDescGZIP(), []int{1}
+}
+
+func (x *RemoteStorageMapping) GetMappings() map[string]*RemoteStorageLocation {
+	if x != nil {
+		return x.Mappings
+	}
+	return nil
+}
+
+func (x *RemoteStorageMapping) GetPrimaryBucketStorageName() string {
+	if x != nil {
+		return x.PrimaryBucketStorageName
+	}
+	return ""
+}
+
+type RemoteStorageLocation struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Name   string `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
+	Bucket string `protobuf:"bytes,2,opt,name=bucket,proto3" json:"bucket,omitempty"`
+	Path   string `protobuf:"bytes,3,opt,name=path,proto3" json:"path,omitempty"`
+}
+
+func (x *RemoteStorageLocation) Reset() {
+	*x = RemoteStorageLocation{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_remote_proto_msgTypes[2]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *RemoteStorageLocation) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*RemoteStorageLocation) ProtoMessage() {}
+
+func (x *RemoteStorageLocation) ProtoReflect() protoreflect.Message {
+	mi := &file_remote_proto_msgTypes[2]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use RemoteStorageLocation.ProtoReflect.Descriptor instead.
+func (*RemoteStorageLocation) Descriptor() ([]byte, []int) {
+	return file_remote_proto_rawDescGZIP(), []int{2}
+}
+
+func (x *RemoteStorageLocation) GetName() string {
+	if x != nil {
+		return x.Name
+	}
+	return ""
+}
+
+func (x *RemoteStorageLocation) GetBucket() string {
+	if x != nil {
+		return x.Bucket
+	}
+	return ""
+}
+
+func (x *RemoteStorageLocation) GetPath() string {
+	if x != nil {
+		return x.Path
+	}
+	return ""
+}
+
+var File_remote_proto protoreflect.FileDescriptor
+
+var file_remote_proto_rawDesc = []byte{
+	0x0a, 0x0c, 0x72, 0x65, 0x6d, 0x6f, 0x74, 0x65, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12, 0x09,
+	0x72, 0x65, 0x6d, 0x6f, 0x74, 0x65, 0x5f, 0x70, 0x62, 0x22, 0xe2, 0x0d, 0x0a, 0x0a, 0x52, 0x65,
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+	0x12, 0x22, 0x0a, 0x0d, 0x73, 0x33, 0x5f, 0x61, 0x63, 0x63, 0x65, 0x73, 0x73, 0x5f, 0x6b, 0x65,
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+	0x73, 0x4b, 0x65, 0x79, 0x12, 0x22, 0x0a, 0x0d, 0x73, 0x33, 0x5f, 0x73, 0x65, 0x63, 0x72, 0x65,
+	0x74, 0x5f, 0x6b, 0x65, 0x79, 0x18, 0x05, 0x20, 0x01, 0x28, 0x09, 0x52, 0x0b, 0x73, 0x33, 0x53,
+	0x65, 0x63, 0x72, 0x65, 0x74, 0x4b, 0x65, 0x79, 0x12, 0x1b, 0x0a, 0x09, 0x73, 0x33, 0x5f, 0x72,
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+	0x72, 0x79, 0x12, 0x10, 0x0a, 0x03, 0x6b, 0x65, 0x79, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52,
+	0x03, 0x6b, 0x65, 0x79, 0x12, 0x36, 0x0a, 0x05, 0x76, 0x61, 0x6c, 0x75, 0x65, 0x18, 0x02, 0x20,
+	0x01, 0x28, 0x0b, 0x32, 0x20, 0x2e, 0x72, 0x65, 0x6d, 0x6f, 0x74, 0x65, 0x5f, 0x70, 0x62, 0x2e,
+	0x52, 0x65, 0x6d, 0x6f, 0x74, 0x65, 0x53, 0x74, 0x6f, 0x72, 0x61, 0x67, 0x65, 0x4c, 0x6f, 0x63,
+	0x61, 0x74, 0x69, 0x6f, 0x6e, 0x52, 0x05, 0x76, 0x61, 0x6c, 0x75, 0x65, 0x3a, 0x02, 0x38, 0x01,
+	0x22, 0x57, 0x0a, 0x15, 0x52, 0x65, 0x6d, 0x6f, 0x74, 0x65, 0x53, 0x74, 0x6f, 0x72, 0x61, 0x67,
+	0x65, 0x4c, 0x6f, 0x63, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x12, 0x12, 0x0a, 0x04, 0x6e, 0x61, 0x6d,
+	0x65, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x04, 0x6e, 0x61, 0x6d, 0x65, 0x12, 0x16, 0x0a,
+	0x06, 0x62, 0x75, 0x63, 0x6b, 0x65, 0x74, 0x18, 0x02, 0x20, 0x01, 0x28, 0x09, 0x52, 0x06, 0x62,
+	0x75, 0x63, 0x6b, 0x65, 0x74, 0x12, 0x12, 0x0a, 0x04, 0x70, 0x61, 0x74, 0x68, 0x18, 0x03, 0x20,
+	0x01, 0x28, 0x09, 0x52, 0x04, 0x70, 0x61, 0x74, 0x68, 0x42, 0x50, 0x0a, 0x10, 0x73, 0x65, 0x61,
+	0x77, 0x65, 0x65, 0x64, 0x66, 0x73, 0x2e, 0x63, 0x6c, 0x69, 0x65, 0x6e, 0x74, 0x42, 0x0a, 0x46,
+	0x69, 0x6c, 0x65, 0x72, 0x50, 0x72, 0x6f, 0x74, 0x6f, 0x5a, 0x30, 0x67, 0x69, 0x74, 0x68, 0x75,
+	0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x63, 0x68, 0x72, 0x69, 0x73, 0x6c, 0x75, 0x73, 0x66, 0x2f,
+	0x73, 0x65, 0x61, 0x77, 0x65, 0x65, 0x64, 0x66, 0x73, 0x2f, 0x77, 0x65, 0x65, 0x64, 0x2f, 0x70,
+	0x62, 0x2f, 0x72, 0x65, 0x6d, 0x6f, 0x74, 0x65, 0x5f, 0x70, 0x62, 0x62, 0x06, 0x70, 0x72, 0x6f,
+	0x74, 0x6f, 0x33,
+}
+
+var (
+	file_remote_proto_rawDescOnce sync.Once
+	file_remote_proto_rawDescData = file_remote_proto_rawDesc
+)
+
+func file_remote_proto_rawDescGZIP() []byte {
+	file_remote_proto_rawDescOnce.Do(func() {
+		file_remote_proto_rawDescData = protoimpl.X.CompressGZIP(file_remote_proto_rawDescData)
+	})
+	return file_remote_proto_rawDescData
+}
+
+var file_remote_proto_msgTypes = make([]protoimpl.MessageInfo, 4)
+var file_remote_proto_goTypes = []interface{}{
+	(*RemoteConf)(nil),            // 0: remote_pb.RemoteConf
+	(*RemoteStorageMapping)(nil),  // 1: remote_pb.RemoteStorageMapping
+	(*RemoteStorageLocation)(nil), // 2: remote_pb.RemoteStorageLocation
+	nil,                           // 3: remote_pb.RemoteStorageMapping.MappingsEntry
+}
+var file_remote_proto_depIdxs = []int32{
+	3, // 0: remote_pb.RemoteStorageMapping.mappings:type_name -> remote_pb.RemoteStorageMapping.MappingsEntry
+	2, // 1: remote_pb.RemoteStorageMapping.MappingsEntry.value:type_name -> remote_pb.RemoteStorageLocation
+	2, // [2:2] is the sub-list for method output_type
+	2, // [2:2] is the sub-list for method input_type
+	2, // [2:2] is the sub-list for extension type_name
+	2, // [2:2] is the sub-list for extension extendee
+	0, // [0:2] is the sub-list for field type_name
+}
+
+func init() { file_remote_proto_init() }
+func file_remote_proto_init() {
+	if File_remote_proto != nil {
+		return
+	}
+	if !protoimpl.UnsafeEnabled {
+		file_remote_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*RemoteConf); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_remote_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*RemoteStorageMapping); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_remote_proto_msgTypes[2].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*RemoteStorageLocation); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_remote_proto_rawDesc,
+			NumEnums:      0,
+			NumMessages:   4,
+			NumExtensions: 0,
+			NumServices:   0,
+		},
+		GoTypes:           file_remote_proto_goTypes,
+		DependencyIndexes: file_remote_proto_depIdxs,
+		MessageInfos:      file_remote_proto_msgTypes,
+	}.Build()
+	File_remote_proto = out.File
+	file_remote_proto_rawDesc = nil
+	file_remote_proto_goTypes = nil
+	file_remote_proto_depIdxs = nil
+}
diff --git a/weed/pb/remote_pb/remote_pb_helper.go b/weed/pb/remote_pb/remote_pb_helper.go
new file mode 100644
index 000000000..03a635e60
--- /dev/null
+++ b/weed/pb/remote_pb/remote_pb_helper.go
@@ -0,0 +1,8 @@
+package remote_pb
+
+import "github.com/golang/protobuf/proto"
+
+func (fp *RemoteStorageLocation) Key() interface{} {
+	key, _ := proto.Marshal(fp)
+	return string(key)
+}
diff --git a/weed/pb/volume_server.proto b/weed/pb/volume_server.proto
index c255be488..18662b804 100644
--- a/weed/pb/volume_server.proto
+++ b/weed/pb/volume_server.proto
@@ -3,6 +3,8 @@ syntax = "proto3";
 package volume_server_pb;
 option go_package = "github.com/chrislusf/seaweedfs/weed/pb/volume_server_pb";
 
+import "remote.proto";
+
 //////////////////////////////////////////////////
 
 service VolumeServer {
@@ -260,6 +262,7 @@ message CopyFileRequest {
 }
 message CopyFileResponse {
     bytes file_content = 1;
+    int64 modified_ts_ns = 2;
 }
 
 message ReadNeedleBlobRequest {
@@ -472,15 +475,15 @@ message FetchAndWriteNeedleRequest {
     uint32 cookie = 3;
     int64 offset = 4;
     int64 size = 5;
+    message Replica {
+        string url = 1;
+        string public_url = 2;
+    }
+    repeated Replica replicas = 6;
+    string auth = 7;
     // remote conf
-    string remote_type = 6;
-    string remote_name = 7;
-    string s3_access_key = 8;
-    string s3_secret_key = 9;
-    string s3_region = 10;
-    string s3_endpoint = 11;
-    string remote_bucket = 12;
-    string remote_path = 13;
+    remote_pb.RemoteConf remote_conf = 15;
+    remote_pb.RemoteStorageLocation remote_location = 16;
 }
 message FetchAndWriteNeedleResponse {
 }
diff --git a/weed/pb/volume_server_pb/volume_server.pb.go b/weed/pb/volume_server_pb/volume_server.pb.go
index aea7e7c2c..a63a5a450 100644
--- a/weed/pb/volume_server_pb/volume_server.pb.go
+++ b/weed/pb/volume_server_pb/volume_server.pb.go
@@ -8,6 +8,7 @@ package volume_server_pb
 
 import (
 	context "context"
+	remote_pb "github.com/chrislusf/seaweedfs/weed/pb/remote_pb"
 	proto "github.com/golang/protobuf/proto"
 	grpc "google.golang.org/grpc"
 	codes "google.golang.org/grpc/codes"
@@ -1931,7 +1932,8 @@ type CopyFileResponse struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	FileContent []byte `protobuf:"bytes,1,opt,name=file_content,json=fileContent,proto3" json:"file_content,omitempty"`
+	FileContent  []byte `protobuf:"bytes,1,opt,name=file_content,json=fileContent,proto3" json:"file_content,omitempty"`
+	ModifiedTsNs int64  `protobuf:"varint,2,opt,name=modified_ts_ns,json=modifiedTsNs,proto3" json:"modified_ts_ns,omitempty"`
 }
 
 func (x *CopyFileResponse) Reset() {
@@ -1973,6 +1975,13 @@ func (x *CopyFileResponse) GetFileContent() []byte {
 	return nil
 }
 
+func (x *CopyFileResponse) GetModifiedTsNs() int64 {
+	if x != nil {
+		return x.ModifiedTsNs
+	}
+	return 0
+}
+
 type ReadNeedleBlobRequest struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -4321,20 +4330,16 @@ type FetchAndWriteNeedleRequest struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	VolumeId uint32 `protobuf:"varint,1,opt,name=volume_id,json=volumeId,proto3" json:"volume_id,omitempty"`
-	NeedleId uint64 `protobuf:"varint,2,opt,name=needle_id,json=needleId,proto3" json:"needle_id,omitempty"`
-	Cookie   uint32 `protobuf:"varint,3,opt,name=cookie,proto3" json:"cookie,omitempty"`
-	Offset   int64  `protobuf:"varint,4,opt,name=offset,proto3" json:"offset,omitempty"`
-	Size     int64  `protobuf:"varint,5,opt,name=size,proto3" json:"size,omitempty"`
+	VolumeId uint32                                `protobuf:"varint,1,opt,name=volume_id,json=volumeId,proto3" json:"volume_id,omitempty"`
+	NeedleId uint64                                `protobuf:"varint,2,opt,name=needle_id,json=needleId,proto3" json:"needle_id,omitempty"`
+	Cookie   uint32                                `protobuf:"varint,3,opt,name=cookie,proto3" json:"cookie,omitempty"`
+	Offset   int64                                 `protobuf:"varint,4,opt,name=offset,proto3" json:"offset,omitempty"`
+	Size     int64                                 `protobuf:"varint,5,opt,name=size,proto3" json:"size,omitempty"`
+	Replicas []*FetchAndWriteNeedleRequest_Replica `protobuf:"bytes,6,rep,name=replicas,proto3" json:"replicas,omitempty"`
+	Auth     string                                `protobuf:"bytes,7,opt,name=auth,proto3" json:"auth,omitempty"`
 	// remote conf
-	RemoteType   string `protobuf:"bytes,6,opt,name=remote_type,json=remoteType,proto3" json:"remote_type,omitempty"`
-	RemoteName   string `protobuf:"bytes,7,opt,name=remote_name,json=remoteName,proto3" json:"remote_name,omitempty"`
-	S3AccessKey  string `protobuf:"bytes,8,opt,name=s3_access_key,json=s3AccessKey,proto3" json:"s3_access_key,omitempty"`
-	S3SecretKey  string `protobuf:"bytes,9,opt,name=s3_secret_key,json=s3SecretKey,proto3" json:"s3_secret_key,omitempty"`
-	S3Region     string `protobuf:"bytes,10,opt,name=s3_region,json=s3Region,proto3" json:"s3_region,omitempty"`
-	S3Endpoint   string `protobuf:"bytes,11,opt,name=s3_endpoint,json=s3Endpoint,proto3" json:"s3_endpoint,omitempty"`
-	RemoteBucket string `protobuf:"bytes,12,opt,name=remote_bucket,json=remoteBucket,proto3" json:"remote_bucket,omitempty"`
-	RemotePath   string `protobuf:"bytes,13,opt,name=remote_path,json=remotePath,proto3" json:"remote_path,omitempty"`
+	RemoteConf     *remote_pb.RemoteConf            `protobuf:"bytes,15,opt,name=remote_conf,json=remoteConf,proto3" json:"remote_conf,omitempty"`
+	RemoteLocation *remote_pb.RemoteStorageLocation `protobuf:"bytes,16,opt,name=remote_location,json=remoteLocation,proto3" json:"remote_location,omitempty"`
 }
 
 func (x *FetchAndWriteNeedleRequest) Reset() {
@@ -4404,60 +4409,32 @@ func (x *FetchAndWriteNeedleRequest) GetSize() int64 {
 	return 0
 }
 
-func (x *FetchAndWriteNeedleRequest) GetRemoteType() string {
-	if x != nil {
-		return x.RemoteType
-	}
-	return ""
-}
-
-func (x *FetchAndWriteNeedleRequest) GetRemoteName() string {
-	if x != nil {
-		return x.RemoteName
-	}
-	return ""
-}
-
-func (x *FetchAndWriteNeedleRequest) GetS3AccessKey() string {
+func (x *FetchAndWriteNeedleRequest) GetReplicas() []*FetchAndWriteNeedleRequest_Replica {
 	if x != nil {
-		return x.S3AccessKey
+		return x.Replicas
 	}
-	return ""
-}
-
-func (x *FetchAndWriteNeedleRequest) GetS3SecretKey() string {
-	if x != nil {
-		return x.S3SecretKey
-	}
-	return ""
-}
-
-func (x *FetchAndWriteNeedleRequest) GetS3Region() string {
-	if x != nil {
-		return x.S3Region
-	}
-	return ""
+	return nil
 }
 
-func (x *FetchAndWriteNeedleRequest) GetS3Endpoint() string {
+func (x *FetchAndWriteNeedleRequest) GetAuth() string {
 	if x != nil {
-		return x.S3Endpoint
+		return x.Auth
 	}
 	return ""
 }
 
-func (x *FetchAndWriteNeedleRequest) GetRemoteBucket() string {
+func (x *FetchAndWriteNeedleRequest) GetRemoteConf() *remote_pb.RemoteConf {
 	if x != nil {
-		return x.RemoteBucket
+		return x.RemoteConf
 	}
-	return ""
+	return nil
 }
 
-func (x *FetchAndWriteNeedleRequest) GetRemotePath() string {
+func (x *FetchAndWriteNeedleRequest) GetRemoteLocation() *remote_pb.RemoteStorageLocation {
 	if x != nil {
-		return x.RemotePath
+		return x.RemoteLocation
 	}
-	return ""
+	return nil
 }
 
 type FetchAndWriteNeedleResponse struct {
@@ -4767,6 +4744,61 @@ func (x *VolumeNeedleStatusResponse) GetTtl() string {
 	return ""
 }
 
+type FetchAndWriteNeedleRequest_Replica struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Url       string `protobuf:"bytes,1,opt,name=url,proto3" json:"url,omitempty"`
+	PublicUrl string `protobuf:"bytes,2,opt,name=public_url,json=publicUrl,proto3" json:"public_url,omitempty"`
+}
+
+func (x *FetchAndWriteNeedleRequest_Replica) Reset() {
+	*x = FetchAndWriteNeedleRequest_Replica{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_volume_server_proto_msgTypes[84]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *FetchAndWriteNeedleRequest_Replica) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*FetchAndWriteNeedleRequest_Replica) ProtoMessage() {}
+
+func (x *FetchAndWriteNeedleRequest_Replica) ProtoReflect() protoreflect.Message {
+	mi := &file_volume_server_proto_msgTypes[84]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use FetchAndWriteNeedleRequest_Replica.ProtoReflect.Descriptor instead.
+func (*FetchAndWriteNeedleRequest_Replica) Descriptor() ([]byte, []int) {
+	return file_volume_server_proto_rawDescGZIP(), []int{78, 0}
+}
+
+func (x *FetchAndWriteNeedleRequest_Replica) GetUrl() string {
+	if x != nil {
+		return x.Url
+	}
+	return ""
+}
+
+func (x *FetchAndWriteNeedleRequest_Replica) GetPublicUrl() string {
+	if x != nil {
+		return x.PublicUrl
+	}
+	return ""
+}
+
 type QueryRequest_Filter struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -4780,7 +4812,7 @@ type QueryRequest_Filter struct {
 func (x *QueryRequest_Filter) Reset() {
 	*x = QueryRequest_Filter{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_volume_server_proto_msgTypes[84]
+		mi := &file_volume_server_proto_msgTypes[85]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -4793,7 +4825,7 @@ func (x *QueryRequest_Filter) String() string {
 func (*QueryRequest_Filter) ProtoMessage() {}
 
 func (x *QueryRequest_Filter) ProtoReflect() protoreflect.Message {
-	mi := &file_volume_server_proto_msgTypes[84]
+	mi := &file_volume_server_proto_msgTypes[85]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -4845,7 +4877,7 @@ type QueryRequest_InputSerialization struct {
 func (x *QueryRequest_InputSerialization) Reset() {
 	*x = QueryRequest_InputSerialization{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_volume_server_proto_msgTypes[85]
+		mi := &file_volume_server_proto_msgTypes[86]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -4858,7 +4890,7 @@ func (x *QueryRequest_InputSerialization) String() string {
 func (*QueryRequest_InputSerialization) ProtoMessage() {}
 
 func (x *QueryRequest_InputSerialization) ProtoReflect() protoreflect.Message {
-	mi := &file_volume_server_proto_msgTypes[85]
+	mi := &file_volume_server_proto_msgTypes[86]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -4914,7 +4946,7 @@ type QueryRequest_OutputSerialization struct {
 func (x *QueryRequest_OutputSerialization) Reset() {
 	*x = QueryRequest_OutputSerialization{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_volume_server_proto_msgTypes[86]
+		mi := &file_volume_server_proto_msgTypes[87]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -4927,7 +4959,7 @@ func (x *QueryRequest_OutputSerialization) String() string {
 func (*QueryRequest_OutputSerialization) ProtoMessage() {}
 
 func (x *QueryRequest_OutputSerialization) ProtoReflect() protoreflect.Message {
-	mi := &file_volume_server_proto_msgTypes[86]
+	mi := &file_volume_server_proto_msgTypes[87]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -4975,7 +5007,7 @@ type QueryRequest_InputSerialization_CSVInput struct {
 func (x *QueryRequest_InputSerialization_CSVInput) Reset() {
 	*x = QueryRequest_InputSerialization_CSVInput{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_volume_server_proto_msgTypes[87]
+		mi := &file_volume_server_proto_msgTypes[88]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -4988,7 +5020,7 @@ func (x *QueryRequest_InputSerialization_CSVInput) String() string {
 func (*QueryRequest_InputSerialization_CSVInput) ProtoMessage() {}
 
 func (x *QueryRequest_InputSerialization_CSVInput) ProtoReflect() protoreflect.Message {
-	mi := &file_volume_server_proto_msgTypes[87]
+	mi := &file_volume_server_proto_msgTypes[88]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -5064,7 +5096,7 @@ type QueryRequest_InputSerialization_JSONInput struct {
 func (x *QueryRequest_InputSerialization_JSONInput) Reset() {
 	*x = QueryRequest_InputSerialization_JSONInput{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_volume_server_proto_msgTypes[88]
+		mi := &file_volume_server_proto_msgTypes[89]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -5077,7 +5109,7 @@ func (x *QueryRequest_InputSerialization_JSONInput) String() string {
 func (*QueryRequest_InputSerialization_JSONInput) ProtoMessage() {}
 
 func (x *QueryRequest_InputSerialization_JSONInput) ProtoReflect() protoreflect.Message {
-	mi := &file_volume_server_proto_msgTypes[88]
+	mi := &file_volume_server_proto_msgTypes[89]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -5109,7 +5141,7 @@ type QueryRequest_InputSerialization_ParquetInput struct {
 func (x *QueryRequest_InputSerialization_ParquetInput) Reset() {
 	*x = QueryRequest_InputSerialization_ParquetInput{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_volume_server_proto_msgTypes[89]
+		mi := &file_volume_server_proto_msgTypes[90]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -5122,7 +5154,7 @@ func (x *QueryRequest_InputSerialization_ParquetInput) String() string {
 func (*QueryRequest_InputSerialization_ParquetInput) ProtoMessage() {}
 
 func (x *QueryRequest_InputSerialization_ParquetInput) ProtoReflect() protoreflect.Message {
-	mi := &file_volume_server_proto_msgTypes[89]
+	mi := &file_volume_server_proto_msgTypes[90]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -5153,7 +5185,7 @@ type QueryRequest_OutputSerialization_CSVOutput struct {
 func (x *QueryRequest_OutputSerialization_CSVOutput) Reset() {
 	*x = QueryRequest_OutputSerialization_CSVOutput{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_volume_server_proto_msgTypes[90]
+		mi := &file_volume_server_proto_msgTypes[91]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -5166,7 +5198,7 @@ func (x *QueryRequest_OutputSerialization_CSVOutput) String() string {
 func (*QueryRequest_OutputSerialization_CSVOutput) ProtoMessage() {}
 
 func (x *QueryRequest_OutputSerialization_CSVOutput) ProtoReflect() protoreflect.Message {
-	mi := &file_volume_server_proto_msgTypes[90]
+	mi := &file_volume_server_proto_msgTypes[91]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -5228,7 +5260,7 @@ type QueryRequest_OutputSerialization_JSONOutput struct {
 func (x *QueryRequest_OutputSerialization_JSONOutput) Reset() {
 	*x = QueryRequest_OutputSerialization_JSONOutput{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_volume_server_proto_msgTypes[91]
+		mi := &file_volume_server_proto_msgTypes[92]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -5241,7 +5273,7 @@ func (x *QueryRequest_OutputSerialization_JSONOutput) String() string {
 func (*QueryRequest_OutputSerialization_JSONOutput) ProtoMessage() {}
 
 func (x *QueryRequest_OutputSerialization_JSONOutput) ProtoReflect() protoreflect.Message {
-	mi := &file_volume_server_proto_msgTypes[91]
+	mi := &file_volume_server_proto_msgTypes[92]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -5269,578 +5301,546 @@ var File_volume_server_proto protoreflect.FileDescriptor
 var file_volume_server_proto_rawDesc = []byte{
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 }
 
 var (
@@ -6168,7 +6204,7 @@ func file_volume_server_proto_rawDescGZIP() []byte {
 	return file_volume_server_proto_rawDescData
 }
 
-var file_volume_server_proto_msgTypes = make([]protoimpl.MessageInfo, 92)
+var file_volume_server_proto_msgTypes = make([]protoimpl.MessageInfo, 93)
 var file_volume_server_proto_goTypes = []interface{}{
 	(*BatchDeleteRequest)(nil),                           // 0: volume_server_pb.BatchDeleteRequest
 	(*BatchDeleteResponse)(nil),                          // 1: volume_server_pb.BatchDeleteResponse
@@ -6254,111 +6290,117 @@ var file_volume_server_proto_goTypes = []interface{}{
 	(*QueriedStripe)(nil),                                // 81: volume_server_pb.QueriedStripe
 	(*VolumeNeedleStatusRequest)(nil),                    // 82: volume_server_pb.VolumeNeedleStatusRequest
 	(*VolumeNeedleStatusResponse)(nil),                   // 83: volume_server_pb.VolumeNeedleStatusResponse
-	(*QueryRequest_Filter)(nil),                          // 84: volume_server_pb.QueryRequest.Filter
-	(*QueryRequest_InputSerialization)(nil),              // 85: volume_server_pb.QueryRequest.InputSerialization
-	(*QueryRequest_OutputSerialization)(nil),             // 86: volume_server_pb.QueryRequest.OutputSerialization
-	(*QueryRequest_InputSerialization_CSVInput)(nil),     // 87: volume_server_pb.QueryRequest.InputSerialization.CSVInput
-	(*QueryRequest_InputSerialization_JSONInput)(nil),    // 88: volume_server_pb.QueryRequest.InputSerialization.JSONInput
-	(*QueryRequest_InputSerialization_ParquetInput)(nil), // 89: volume_server_pb.QueryRequest.InputSerialization.ParquetInput
-	(*QueryRequest_OutputSerialization_CSVOutput)(nil),   // 90: volume_server_pb.QueryRequest.OutputSerialization.CSVOutput
-	(*QueryRequest_OutputSerialization_JSONOutput)(nil),  // 91: volume_server_pb.QueryRequest.OutputSerialization.JSONOutput
+	(*FetchAndWriteNeedleRequest_Replica)(nil),           // 84: volume_server_pb.FetchAndWriteNeedleRequest.Replica
+	(*QueryRequest_Filter)(nil),                          // 85: volume_server_pb.QueryRequest.Filter
+	(*QueryRequest_InputSerialization)(nil),              // 86: volume_server_pb.QueryRequest.InputSerialization
+	(*QueryRequest_OutputSerialization)(nil),             // 87: volume_server_pb.QueryRequest.OutputSerialization
+	(*QueryRequest_InputSerialization_CSVInput)(nil),     // 88: volume_server_pb.QueryRequest.InputSerialization.CSVInput
+	(*QueryRequest_InputSerialization_JSONInput)(nil),    // 89: volume_server_pb.QueryRequest.InputSerialization.JSONInput
+	(*QueryRequest_InputSerialization_ParquetInput)(nil), // 90: volume_server_pb.QueryRequest.InputSerialization.ParquetInput
+	(*QueryRequest_OutputSerialization_CSVOutput)(nil),   // 91: volume_server_pb.QueryRequest.OutputSerialization.CSVOutput
+	(*QueryRequest_OutputSerialization_JSONOutput)(nil),  // 92: volume_server_pb.QueryRequest.OutputSerialization.JSONOutput
+	(*remote_pb.RemoteConf)(nil),                         // 93: remote_pb.RemoteConf
+	(*remote_pb.RemoteStorageLocation)(nil),              // 94: remote_pb.RemoteStorageLocation
 }
 var file_volume_server_proto_depIdxs = []int32{
 	2,  // 0: volume_server_pb.BatchDeleteResponse.results:type_name -> volume_server_pb.DeleteResult
 	68, // 1: volume_server_pb.VolumeInfo.files:type_name -> volume_server_pb.RemoteFile
 	66, // 2: volume_server_pb.VolumeServerStatusResponse.disk_statuses:type_name -> volume_server_pb.DiskStatus
 	67, // 3: volume_server_pb.VolumeServerStatusResponse.memory_status:type_name -> volume_server_pb.MemStatus
-	84, // 4: volume_server_pb.QueryRequest.filter:type_name -> volume_server_pb.QueryRequest.Filter
-	85, // 5: volume_server_pb.QueryRequest.input_serialization:type_name -> volume_server_pb.QueryRequest.InputSerialization
-	86, // 6: volume_server_pb.QueryRequest.output_serialization:type_name -> volume_server_pb.QueryRequest.OutputSerialization
-	87, // 7: volume_server_pb.QueryRequest.InputSerialization.csv_input:type_name -> volume_server_pb.QueryRequest.InputSerialization.CSVInput
-	88, // 8: volume_server_pb.QueryRequest.InputSerialization.json_input:type_name -> volume_server_pb.QueryRequest.InputSerialization.JSONInput
-	89, // 9: volume_server_pb.QueryRequest.InputSerialization.parquet_input:type_name -> volume_server_pb.QueryRequest.InputSerialization.ParquetInput
-	90, // 10: volume_server_pb.QueryRequest.OutputSerialization.csv_output:type_name -> volume_server_pb.QueryRequest.OutputSerialization.CSVOutput
-	91, // 11: volume_server_pb.QueryRequest.OutputSerialization.json_output:type_name -> volume_server_pb.QueryRequest.OutputSerialization.JSONOutput
-	0,  // 12: volume_server_pb.VolumeServer.BatchDelete:input_type -> volume_server_pb.BatchDeleteRequest
-	4,  // 13: volume_server_pb.VolumeServer.VacuumVolumeCheck:input_type -> volume_server_pb.VacuumVolumeCheckRequest
-	6,  // 14: volume_server_pb.VolumeServer.VacuumVolumeCompact:input_type -> volume_server_pb.VacuumVolumeCompactRequest
-	8,  // 15: volume_server_pb.VolumeServer.VacuumVolumeCommit:input_type -> volume_server_pb.VacuumVolumeCommitRequest
-	10, // 16: volume_server_pb.VolumeServer.VacuumVolumeCleanup:input_type -> volume_server_pb.VacuumVolumeCleanupRequest
-	12, // 17: volume_server_pb.VolumeServer.DeleteCollection:input_type -> volume_server_pb.DeleteCollectionRequest
-	14, // 18: volume_server_pb.VolumeServer.AllocateVolume:input_type -> volume_server_pb.AllocateVolumeRequest
-	16, // 19: volume_server_pb.VolumeServer.VolumeSyncStatus:input_type -> volume_server_pb.VolumeSyncStatusRequest
-	18, // 20: volume_server_pb.VolumeServer.VolumeIncrementalCopy:input_type -> volume_server_pb.VolumeIncrementalCopyRequest
-	20, // 21: volume_server_pb.VolumeServer.VolumeMount:input_type -> volume_server_pb.VolumeMountRequest
-	22, // 22: volume_server_pb.VolumeServer.VolumeUnmount:input_type -> volume_server_pb.VolumeUnmountRequest
-	24, // 23: volume_server_pb.VolumeServer.VolumeDelete:input_type -> volume_server_pb.VolumeDeleteRequest
-	26, // 24: volume_server_pb.VolumeServer.VolumeMarkReadonly:input_type -> volume_server_pb.VolumeMarkReadonlyRequest
-	28, // 25: volume_server_pb.VolumeServer.VolumeMarkWritable:input_type -> volume_server_pb.VolumeMarkWritableRequest
-	30, // 26: volume_server_pb.VolumeServer.VolumeConfigure:input_type -> volume_server_pb.VolumeConfigureRequest
-	32, // 27: volume_server_pb.VolumeServer.VolumeStatus:input_type -> volume_server_pb.VolumeStatusRequest
-	34, // 28: volume_server_pb.VolumeServer.VolumeCopy:input_type -> volume_server_pb.VolumeCopyRequest
-	64, // 29: volume_server_pb.VolumeServer.ReadVolumeFileStatus:input_type -> volume_server_pb.ReadVolumeFileStatusRequest
-	36, // 30: volume_server_pb.VolumeServer.CopyFile:input_type -> volume_server_pb.CopyFileRequest
-	38, // 31: volume_server_pb.VolumeServer.ReadNeedleBlob:input_type -> volume_server_pb.ReadNeedleBlobRequest
-	40, // 32: volume_server_pb.VolumeServer.WriteNeedleBlob:input_type -> volume_server_pb.WriteNeedleBlobRequest
-	42, // 33: volume_server_pb.VolumeServer.VolumeTailSender:input_type -> volume_server_pb.VolumeTailSenderRequest
-	44, // 34: volume_server_pb.VolumeServer.VolumeTailReceiver:input_type -> volume_server_pb.VolumeTailReceiverRequest
-	46, // 35: volume_server_pb.VolumeServer.VolumeEcShardsGenerate:input_type -> volume_server_pb.VolumeEcShardsGenerateRequest
-	48, // 36: volume_server_pb.VolumeServer.VolumeEcShardsRebuild:input_type -> volume_server_pb.VolumeEcShardsRebuildRequest
-	50, // 37: volume_server_pb.VolumeServer.VolumeEcShardsCopy:input_type -> volume_server_pb.VolumeEcShardsCopyRequest
-	52, // 38: volume_server_pb.VolumeServer.VolumeEcShardsDelete:input_type -> volume_server_pb.VolumeEcShardsDeleteRequest
-	54, // 39: volume_server_pb.VolumeServer.VolumeEcShardsMount:input_type -> volume_server_pb.VolumeEcShardsMountRequest
-	56, // 40: volume_server_pb.VolumeServer.VolumeEcShardsUnmount:input_type -> volume_server_pb.VolumeEcShardsUnmountRequest
-	58, // 41: volume_server_pb.VolumeServer.VolumeEcShardRead:input_type -> volume_server_pb.VolumeEcShardReadRequest
-	60, // 42: volume_server_pb.VolumeServer.VolumeEcBlobDelete:input_type -> volume_server_pb.VolumeEcBlobDeleteRequest
-	62, // 43: volume_server_pb.VolumeServer.VolumeEcShardsToVolume:input_type -> volume_server_pb.VolumeEcShardsToVolumeRequest
-	70, // 44: volume_server_pb.VolumeServer.VolumeTierMoveDatToRemote:input_type -> volume_server_pb.VolumeTierMoveDatToRemoteRequest
-	72, // 45: volume_server_pb.VolumeServer.VolumeTierMoveDatFromRemote:input_type -> volume_server_pb.VolumeTierMoveDatFromRemoteRequest
-	74, // 46: volume_server_pb.VolumeServer.VolumeServerStatus:input_type -> volume_server_pb.VolumeServerStatusRequest
-	76, // 47: volume_server_pb.VolumeServer.VolumeServerLeave:input_type -> volume_server_pb.VolumeServerLeaveRequest
-	78, // 48: volume_server_pb.VolumeServer.FetchAndWriteNeedle:input_type -> volume_server_pb.FetchAndWriteNeedleRequest
-	80, // 49: volume_server_pb.VolumeServer.Query:input_type -> volume_server_pb.QueryRequest
-	82, // 50: volume_server_pb.VolumeServer.VolumeNeedleStatus:input_type -> volume_server_pb.VolumeNeedleStatusRequest
-	1,  // 51: volume_server_pb.VolumeServer.BatchDelete:output_type -> volume_server_pb.BatchDeleteResponse
-	5,  // 52: volume_server_pb.VolumeServer.VacuumVolumeCheck:output_type -> volume_server_pb.VacuumVolumeCheckResponse
-	7,  // 53: volume_server_pb.VolumeServer.VacuumVolumeCompact:output_type -> volume_server_pb.VacuumVolumeCompactResponse
-	9,  // 54: volume_server_pb.VolumeServer.VacuumVolumeCommit:output_type -> volume_server_pb.VacuumVolumeCommitResponse
-	11, // 55: volume_server_pb.VolumeServer.VacuumVolumeCleanup:output_type -> volume_server_pb.VacuumVolumeCleanupResponse
-	13, // 56: volume_server_pb.VolumeServer.DeleteCollection:output_type -> volume_server_pb.DeleteCollectionResponse
-	15, // 57: volume_server_pb.VolumeServer.AllocateVolume:output_type -> volume_server_pb.AllocateVolumeResponse
-	17, // 58: volume_server_pb.VolumeServer.VolumeSyncStatus:output_type -> volume_server_pb.VolumeSyncStatusResponse
-	19, // 59: volume_server_pb.VolumeServer.VolumeIncrementalCopy:output_type -> volume_server_pb.VolumeIncrementalCopyResponse
-	21, // 60: volume_server_pb.VolumeServer.VolumeMount:output_type -> volume_server_pb.VolumeMountResponse
-	23, // 61: volume_server_pb.VolumeServer.VolumeUnmount:output_type -> volume_server_pb.VolumeUnmountResponse
-	25, // 62: volume_server_pb.VolumeServer.VolumeDelete:output_type -> volume_server_pb.VolumeDeleteResponse
-	27, // 63: volume_server_pb.VolumeServer.VolumeMarkReadonly:output_type -> volume_server_pb.VolumeMarkReadonlyResponse
-	29, // 64: volume_server_pb.VolumeServer.VolumeMarkWritable:output_type -> volume_server_pb.VolumeMarkWritableResponse
-	31, // 65: volume_server_pb.VolumeServer.VolumeConfigure:output_type -> volume_server_pb.VolumeConfigureResponse
-	33, // 66: volume_server_pb.VolumeServer.VolumeStatus:output_type -> volume_server_pb.VolumeStatusResponse
-	35, // 67: volume_server_pb.VolumeServer.VolumeCopy:output_type -> volume_server_pb.VolumeCopyResponse
-	65, // 68: volume_server_pb.VolumeServer.ReadVolumeFileStatus:output_type -> volume_server_pb.ReadVolumeFileStatusResponse
-	37, // 69: volume_server_pb.VolumeServer.CopyFile:output_type -> volume_server_pb.CopyFileResponse
-	39, // 70: volume_server_pb.VolumeServer.ReadNeedleBlob:output_type -> volume_server_pb.ReadNeedleBlobResponse
-	41, // 71: volume_server_pb.VolumeServer.WriteNeedleBlob:output_type -> volume_server_pb.WriteNeedleBlobResponse
-	43, // 72: volume_server_pb.VolumeServer.VolumeTailSender:output_type -> volume_server_pb.VolumeTailSenderResponse
-	45, // 73: volume_server_pb.VolumeServer.VolumeTailReceiver:output_type -> volume_server_pb.VolumeTailReceiverResponse
-	47, // 74: volume_server_pb.VolumeServer.VolumeEcShardsGenerate:output_type -> volume_server_pb.VolumeEcShardsGenerateResponse
-	49, // 75: volume_server_pb.VolumeServer.VolumeEcShardsRebuild:output_type -> volume_server_pb.VolumeEcShardsRebuildResponse
-	51, // 76: volume_server_pb.VolumeServer.VolumeEcShardsCopy:output_type -> volume_server_pb.VolumeEcShardsCopyResponse
-	53, // 77: volume_server_pb.VolumeServer.VolumeEcShardsDelete:output_type -> volume_server_pb.VolumeEcShardsDeleteResponse
-	55, // 78: volume_server_pb.VolumeServer.VolumeEcShardsMount:output_type -> volume_server_pb.VolumeEcShardsMountResponse
-	57, // 79: volume_server_pb.VolumeServer.VolumeEcShardsUnmount:output_type -> volume_server_pb.VolumeEcShardsUnmountResponse
-	59, // 80: volume_server_pb.VolumeServer.VolumeEcShardRead:output_type -> volume_server_pb.VolumeEcShardReadResponse
-	61, // 81: volume_server_pb.VolumeServer.VolumeEcBlobDelete:output_type -> volume_server_pb.VolumeEcBlobDeleteResponse
-	63, // 82: volume_server_pb.VolumeServer.VolumeEcShardsToVolume:output_type -> volume_server_pb.VolumeEcShardsToVolumeResponse
-	71, // 83: volume_server_pb.VolumeServer.VolumeTierMoveDatToRemote:output_type -> volume_server_pb.VolumeTierMoveDatToRemoteResponse
-	73, // 84: volume_server_pb.VolumeServer.VolumeTierMoveDatFromRemote:output_type -> volume_server_pb.VolumeTierMoveDatFromRemoteResponse
-	75, // 85: volume_server_pb.VolumeServer.VolumeServerStatus:output_type -> volume_server_pb.VolumeServerStatusResponse
-	77, // 86: volume_server_pb.VolumeServer.VolumeServerLeave:output_type -> volume_server_pb.VolumeServerLeaveResponse
-	79, // 87: volume_server_pb.VolumeServer.FetchAndWriteNeedle:output_type -> volume_server_pb.FetchAndWriteNeedleResponse
-	81, // 88: volume_server_pb.VolumeServer.Query:output_type -> volume_server_pb.QueriedStripe
-	83, // 89: volume_server_pb.VolumeServer.VolumeNeedleStatus:output_type -> volume_server_pb.VolumeNeedleStatusResponse
-	51, // [51:90] is the sub-list for method output_type
-	12, // [12:51] is the sub-list for method input_type
-	12, // [12:12] is the sub-list for extension type_name
-	12, // [12:12] is the sub-list for extension extendee
-	0,  // [0:12] is the sub-list for field type_name
+	84, // 4: volume_server_pb.FetchAndWriteNeedleRequest.replicas:type_name -> volume_server_pb.FetchAndWriteNeedleRequest.Replica
+	93, // 5: volume_server_pb.FetchAndWriteNeedleRequest.remote_conf:type_name -> remote_pb.RemoteConf
+	94, // 6: volume_server_pb.FetchAndWriteNeedleRequest.remote_location:type_name -> remote_pb.RemoteStorageLocation
+	85, // 7: volume_server_pb.QueryRequest.filter:type_name -> volume_server_pb.QueryRequest.Filter
+	86, // 8: volume_server_pb.QueryRequest.input_serialization:type_name -> volume_server_pb.QueryRequest.InputSerialization
+	87, // 9: volume_server_pb.QueryRequest.output_serialization:type_name -> volume_server_pb.QueryRequest.OutputSerialization
+	88, // 10: volume_server_pb.QueryRequest.InputSerialization.csv_input:type_name -> volume_server_pb.QueryRequest.InputSerialization.CSVInput
+	89, // 11: volume_server_pb.QueryRequest.InputSerialization.json_input:type_name -> volume_server_pb.QueryRequest.InputSerialization.JSONInput
+	90, // 12: volume_server_pb.QueryRequest.InputSerialization.parquet_input:type_name -> volume_server_pb.QueryRequest.InputSerialization.ParquetInput
+	91, // 13: volume_server_pb.QueryRequest.OutputSerialization.csv_output:type_name -> volume_server_pb.QueryRequest.OutputSerialization.CSVOutput
+	92, // 14: volume_server_pb.QueryRequest.OutputSerialization.json_output:type_name -> volume_server_pb.QueryRequest.OutputSerialization.JSONOutput
+	0,  // 15: volume_server_pb.VolumeServer.BatchDelete:input_type -> volume_server_pb.BatchDeleteRequest
+	4,  // 16: volume_server_pb.VolumeServer.VacuumVolumeCheck:input_type -> volume_server_pb.VacuumVolumeCheckRequest
+	6,  // 17: volume_server_pb.VolumeServer.VacuumVolumeCompact:input_type -> volume_server_pb.VacuumVolumeCompactRequest
+	8,  // 18: volume_server_pb.VolumeServer.VacuumVolumeCommit:input_type -> volume_server_pb.VacuumVolumeCommitRequest
+	10, // 19: volume_server_pb.VolumeServer.VacuumVolumeCleanup:input_type -> volume_server_pb.VacuumVolumeCleanupRequest
+	12, // 20: volume_server_pb.VolumeServer.DeleteCollection:input_type -> volume_server_pb.DeleteCollectionRequest
+	14, // 21: volume_server_pb.VolumeServer.AllocateVolume:input_type -> volume_server_pb.AllocateVolumeRequest
+	16, // 22: volume_server_pb.VolumeServer.VolumeSyncStatus:input_type -> volume_server_pb.VolumeSyncStatusRequest
+	18, // 23: volume_server_pb.VolumeServer.VolumeIncrementalCopy:input_type -> volume_server_pb.VolumeIncrementalCopyRequest
+	20, // 24: volume_server_pb.VolumeServer.VolumeMount:input_type -> volume_server_pb.VolumeMountRequest
+	22, // 25: volume_server_pb.VolumeServer.VolumeUnmount:input_type -> volume_server_pb.VolumeUnmountRequest
+	24, // 26: volume_server_pb.VolumeServer.VolumeDelete:input_type -> volume_server_pb.VolumeDeleteRequest
+	26, // 27: volume_server_pb.VolumeServer.VolumeMarkReadonly:input_type -> volume_server_pb.VolumeMarkReadonlyRequest
+	28, // 28: volume_server_pb.VolumeServer.VolumeMarkWritable:input_type -> volume_server_pb.VolumeMarkWritableRequest
+	30, // 29: volume_server_pb.VolumeServer.VolumeConfigure:input_type -> volume_server_pb.VolumeConfigureRequest
+	32, // 30: volume_server_pb.VolumeServer.VolumeStatus:input_type -> volume_server_pb.VolumeStatusRequest
+	34, // 31: volume_server_pb.VolumeServer.VolumeCopy:input_type -> volume_server_pb.VolumeCopyRequest
+	64, // 32: volume_server_pb.VolumeServer.ReadVolumeFileStatus:input_type -> volume_server_pb.ReadVolumeFileStatusRequest
+	36, // 33: volume_server_pb.VolumeServer.CopyFile:input_type -> volume_server_pb.CopyFileRequest
+	38, // 34: volume_server_pb.VolumeServer.ReadNeedleBlob:input_type -> volume_server_pb.ReadNeedleBlobRequest
+	40, // 35: volume_server_pb.VolumeServer.WriteNeedleBlob:input_type -> volume_server_pb.WriteNeedleBlobRequest
+	42, // 36: volume_server_pb.VolumeServer.VolumeTailSender:input_type -> volume_server_pb.VolumeTailSenderRequest
+	44, // 37: volume_server_pb.VolumeServer.VolumeTailReceiver:input_type -> volume_server_pb.VolumeTailReceiverRequest
+	46, // 38: volume_server_pb.VolumeServer.VolumeEcShardsGenerate:input_type -> volume_server_pb.VolumeEcShardsGenerateRequest
+	48, // 39: volume_server_pb.VolumeServer.VolumeEcShardsRebuild:input_type -> volume_server_pb.VolumeEcShardsRebuildRequest
+	50, // 40: volume_server_pb.VolumeServer.VolumeEcShardsCopy:input_type -> volume_server_pb.VolumeEcShardsCopyRequest
+	52, // 41: volume_server_pb.VolumeServer.VolumeEcShardsDelete:input_type -> volume_server_pb.VolumeEcShardsDeleteRequest
+	54, // 42: volume_server_pb.VolumeServer.VolumeEcShardsMount:input_type -> volume_server_pb.VolumeEcShardsMountRequest
+	56, // 43: volume_server_pb.VolumeServer.VolumeEcShardsUnmount:input_type -> volume_server_pb.VolumeEcShardsUnmountRequest
+	58, // 44: volume_server_pb.VolumeServer.VolumeEcShardRead:input_type -> volume_server_pb.VolumeEcShardReadRequest
+	60, // 45: volume_server_pb.VolumeServer.VolumeEcBlobDelete:input_type -> volume_server_pb.VolumeEcBlobDeleteRequest
+	62, // 46: volume_server_pb.VolumeServer.VolumeEcShardsToVolume:input_type -> volume_server_pb.VolumeEcShardsToVolumeRequest
+	70, // 47: volume_server_pb.VolumeServer.VolumeTierMoveDatToRemote:input_type -> volume_server_pb.VolumeTierMoveDatToRemoteRequest
+	72, // 48: volume_server_pb.VolumeServer.VolumeTierMoveDatFromRemote:input_type -> volume_server_pb.VolumeTierMoveDatFromRemoteRequest
+	74, // 49: volume_server_pb.VolumeServer.VolumeServerStatus:input_type -> volume_server_pb.VolumeServerStatusRequest
+	76, // 50: volume_server_pb.VolumeServer.VolumeServerLeave:input_type -> volume_server_pb.VolumeServerLeaveRequest
+	78, // 51: volume_server_pb.VolumeServer.FetchAndWriteNeedle:input_type -> volume_server_pb.FetchAndWriteNeedleRequest
+	80, // 52: volume_server_pb.VolumeServer.Query:input_type -> volume_server_pb.QueryRequest
+	82, // 53: volume_server_pb.VolumeServer.VolumeNeedleStatus:input_type -> volume_server_pb.VolumeNeedleStatusRequest
+	1,  // 54: volume_server_pb.VolumeServer.BatchDelete:output_type -> volume_server_pb.BatchDeleteResponse
+	5,  // 55: volume_server_pb.VolumeServer.VacuumVolumeCheck:output_type -> volume_server_pb.VacuumVolumeCheckResponse
+	7,  // 56: volume_server_pb.VolumeServer.VacuumVolumeCompact:output_type -> volume_server_pb.VacuumVolumeCompactResponse
+	9,  // 57: volume_server_pb.VolumeServer.VacuumVolumeCommit:output_type -> volume_server_pb.VacuumVolumeCommitResponse
+	11, // 58: volume_server_pb.VolumeServer.VacuumVolumeCleanup:output_type -> volume_server_pb.VacuumVolumeCleanupResponse
+	13, // 59: volume_server_pb.VolumeServer.DeleteCollection:output_type -> volume_server_pb.DeleteCollectionResponse
+	15, // 60: volume_server_pb.VolumeServer.AllocateVolume:output_type -> volume_server_pb.AllocateVolumeResponse
+	17, // 61: volume_server_pb.VolumeServer.VolumeSyncStatus:output_type -> volume_server_pb.VolumeSyncStatusResponse
+	19, // 62: volume_server_pb.VolumeServer.VolumeIncrementalCopy:output_type -> volume_server_pb.VolumeIncrementalCopyResponse
+	21, // 63: volume_server_pb.VolumeServer.VolumeMount:output_type -> volume_server_pb.VolumeMountResponse
+	23, // 64: volume_server_pb.VolumeServer.VolumeUnmount:output_type -> volume_server_pb.VolumeUnmountResponse
+	25, // 65: volume_server_pb.VolumeServer.VolumeDelete:output_type -> volume_server_pb.VolumeDeleteResponse
+	27, // 66: volume_server_pb.VolumeServer.VolumeMarkReadonly:output_type -> volume_server_pb.VolumeMarkReadonlyResponse
+	29, // 67: volume_server_pb.VolumeServer.VolumeMarkWritable:output_type -> volume_server_pb.VolumeMarkWritableResponse
+	31, // 68: volume_server_pb.VolumeServer.VolumeConfigure:output_type -> volume_server_pb.VolumeConfigureResponse
+	33, // 69: volume_server_pb.VolumeServer.VolumeStatus:output_type -> volume_server_pb.VolumeStatusResponse
+	35, // 70: volume_server_pb.VolumeServer.VolumeCopy:output_type -> volume_server_pb.VolumeCopyResponse
+	65, // 71: volume_server_pb.VolumeServer.ReadVolumeFileStatus:output_type -> volume_server_pb.ReadVolumeFileStatusResponse
+	37, // 72: volume_server_pb.VolumeServer.CopyFile:output_type -> volume_server_pb.CopyFileResponse
+	39, // 73: volume_server_pb.VolumeServer.ReadNeedleBlob:output_type -> volume_server_pb.ReadNeedleBlobResponse
+	41, // 74: volume_server_pb.VolumeServer.WriteNeedleBlob:output_type -> volume_server_pb.WriteNeedleBlobResponse
+	43, // 75: volume_server_pb.VolumeServer.VolumeTailSender:output_type -> volume_server_pb.VolumeTailSenderResponse
+	45, // 76: volume_server_pb.VolumeServer.VolumeTailReceiver:output_type -> volume_server_pb.VolumeTailReceiverResponse
+	47, // 77: volume_server_pb.VolumeServer.VolumeEcShardsGenerate:output_type -> volume_server_pb.VolumeEcShardsGenerateResponse
+	49, // 78: volume_server_pb.VolumeServer.VolumeEcShardsRebuild:output_type -> volume_server_pb.VolumeEcShardsRebuildResponse
+	51, // 79: volume_server_pb.VolumeServer.VolumeEcShardsCopy:output_type -> volume_server_pb.VolumeEcShardsCopyResponse
+	53, // 80: volume_server_pb.VolumeServer.VolumeEcShardsDelete:output_type -> volume_server_pb.VolumeEcShardsDeleteResponse
+	55, // 81: volume_server_pb.VolumeServer.VolumeEcShardsMount:output_type -> volume_server_pb.VolumeEcShardsMountResponse
+	57, // 82: volume_server_pb.VolumeServer.VolumeEcShardsUnmount:output_type -> volume_server_pb.VolumeEcShardsUnmountResponse
+	59, // 83: volume_server_pb.VolumeServer.VolumeEcShardRead:output_type -> volume_server_pb.VolumeEcShardReadResponse
+	61, // 84: volume_server_pb.VolumeServer.VolumeEcBlobDelete:output_type -> volume_server_pb.VolumeEcBlobDeleteResponse
+	63, // 85: volume_server_pb.VolumeServer.VolumeEcShardsToVolume:output_type -> volume_server_pb.VolumeEcShardsToVolumeResponse
+	71, // 86: volume_server_pb.VolumeServer.VolumeTierMoveDatToRemote:output_type -> volume_server_pb.VolumeTierMoveDatToRemoteResponse
+	73, // 87: volume_server_pb.VolumeServer.VolumeTierMoveDatFromRemote:output_type -> volume_server_pb.VolumeTierMoveDatFromRemoteResponse
+	75, // 88: volume_server_pb.VolumeServer.VolumeServerStatus:output_type -> volume_server_pb.VolumeServerStatusResponse
+	77, // 89: volume_server_pb.VolumeServer.VolumeServerLeave:output_type -> volume_server_pb.VolumeServerLeaveResponse
+	79, // 90: volume_server_pb.VolumeServer.FetchAndWriteNeedle:output_type -> volume_server_pb.FetchAndWriteNeedleResponse
+	81, // 91: volume_server_pb.VolumeServer.Query:output_type -> volume_server_pb.QueriedStripe
+	83, // 92: volume_server_pb.VolumeServer.VolumeNeedleStatus:output_type -> volume_server_pb.VolumeNeedleStatusResponse
+	54, // [54:93] is the sub-list for method output_type
+	15, // [15:54] is the sub-list for method input_type
+	15, // [15:15] is the sub-list for extension type_name
+	15, // [15:15] is the sub-list for extension extendee
+	0,  // [0:15] is the sub-list for field type_name
 }
 
 func init() { file_volume_server_proto_init() }
@@ -7376,7 +7418,7 @@ func file_volume_server_proto_init() {
 			}
 		}
 		file_volume_server_proto_msgTypes[84].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*QueryRequest_Filter); i {
+			switch v := v.(*FetchAndWriteNeedleRequest_Replica); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -7388,7 +7430,7 @@ func file_volume_server_proto_init() {
 			}
 		}
 		file_volume_server_proto_msgTypes[85].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*QueryRequest_InputSerialization); i {
+			switch v := v.(*QueryRequest_Filter); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -7400,7 +7442,7 @@ func file_volume_server_proto_init() {
 			}
 		}
 		file_volume_server_proto_msgTypes[86].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*QueryRequest_OutputSerialization); i {
+			switch v := v.(*QueryRequest_InputSerialization); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -7412,7 +7454,7 @@ func file_volume_server_proto_init() {
 			}
 		}
 		file_volume_server_proto_msgTypes[87].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*QueryRequest_InputSerialization_CSVInput); i {
+			switch v := v.(*QueryRequest_OutputSerialization); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -7424,7 +7466,7 @@ func file_volume_server_proto_init() {
 			}
 		}
 		file_volume_server_proto_msgTypes[88].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*QueryRequest_InputSerialization_JSONInput); i {
+			switch v := v.(*QueryRequest_InputSerialization_CSVInput); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -7436,7 +7478,7 @@ func file_volume_server_proto_init() {
 			}
 		}
 		file_volume_server_proto_msgTypes[89].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*QueryRequest_InputSerialization_ParquetInput); i {
+			switch v := v.(*QueryRequest_InputSerialization_JSONInput); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -7448,7 +7490,7 @@ func file_volume_server_proto_init() {
 			}
 		}
 		file_volume_server_proto_msgTypes[90].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*QueryRequest_OutputSerialization_CSVOutput); i {
+			switch v := v.(*QueryRequest_InputSerialization_ParquetInput); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -7460,6 +7502,18 @@ func file_volume_server_proto_init() {
 			}
 		}
 		file_volume_server_proto_msgTypes[91].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*QueryRequest_OutputSerialization_CSVOutput); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_volume_server_proto_msgTypes[92].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*QueryRequest_OutputSerialization_JSONOutput); i {
 			case 0:
 				return &v.state
@@ -7478,7 +7532,7 @@ func file_volume_server_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_volume_server_proto_rawDesc,
 			NumEnums:      0,
-			NumMessages:   92,
+			NumMessages:   93,
 			NumExtensions: 0,
 			NumServices:   1,
 		},
diff --git a/weed/remote_storage/azure/azure_highlevel.go b/weed/remote_storage/azure/azure_highlevel.go
new file mode 100644
index 000000000..9b735c2cb
--- /dev/null
+++ b/weed/remote_storage/azure/azure_highlevel.go
@@ -0,0 +1,120 @@
+package azure
+
+import (
+	"context"
+	"crypto/rand"
+	"encoding/base64"
+	"errors"
+	"fmt"
+	"github.com/Azure/azure-pipeline-go/pipeline"
+	. "github.com/Azure/azure-storage-blob-go/azblob"
+	"io"
+	"sync"
+)
+
+// copied from https://github.com/Azure/azure-storage-blob-go/blob/master/azblob/highlevel.go#L73:6
+// uploadReaderAtToBlockBlob was not public
+
+// uploadReaderAtToBlockBlob uploads a buffer in blocks to a block blob.
+func uploadReaderAtToBlockBlob(ctx context.Context, reader io.ReaderAt, readerSize int64,
+	blockBlobURL BlockBlobURL, o UploadToBlockBlobOptions) (CommonResponse, error) {
+	if o.BlockSize == 0 {
+		// If bufferSize > (BlockBlobMaxStageBlockBytes * BlockBlobMaxBlocks), then error
+		if readerSize > BlockBlobMaxStageBlockBytes*BlockBlobMaxBlocks {
+			return nil, errors.New("buffer is too large to upload to a block blob")
+		}
+		// If bufferSize <= BlockBlobMaxUploadBlobBytes, then Upload should be used with just 1 I/O request
+		if readerSize <= BlockBlobMaxUploadBlobBytes {
+			o.BlockSize = BlockBlobMaxUploadBlobBytes // Default if unspecified
+		} else {
+			o.BlockSize = readerSize / BlockBlobMaxBlocks   // buffer / max blocks = block size to use all 50,000 blocks
+			if o.BlockSize < BlobDefaultDownloadBlockSize { // If the block size is smaller than 4MB, round up to 4MB
+				o.BlockSize = BlobDefaultDownloadBlockSize
+			}
+			// StageBlock will be called with blockSize blocks and a Parallelism of (BufferSize / BlockSize).
+		}
+	}
+
+	if readerSize <= BlockBlobMaxUploadBlobBytes {
+		// If the size can fit in 1 Upload call, do it this way
+		var body io.ReadSeeker = io.NewSectionReader(reader, 0, readerSize)
+		if o.Progress != nil {
+			body = pipeline.NewRequestBodyProgress(body, o.Progress)
+		}
+		return blockBlobURL.Upload(ctx, body, o.BlobHTTPHeaders, o.Metadata, o.AccessConditions, o.BlobAccessTier, o.BlobTagsMap, o.ClientProvidedKeyOptions)
+	}
+
+	var numBlocks = uint16(((readerSize - 1) / o.BlockSize) + 1)
+
+	blockIDList := make([]string, numBlocks) // Base-64 encoded block IDs
+	progress := int64(0)
+	progressLock := &sync.Mutex{}
+
+	err := DoBatchTransfer(ctx, BatchTransferOptions{
+		OperationName: "uploadReaderAtToBlockBlob",
+		TransferSize:  readerSize,
+		ChunkSize:     o.BlockSize,
+		Parallelism:   o.Parallelism,
+		Operation: func(offset int64, count int64, ctx context.Context) error {
+			// This function is called once per block.
+			// It is passed this block's offset within the buffer and its count of bytes
+			// Prepare to read the proper block/section of the buffer
+			var body io.ReadSeeker = io.NewSectionReader(reader, offset, count)
+			blockNum := offset / o.BlockSize
+			if o.Progress != nil {
+				blockProgress := int64(0)
+				body = pipeline.NewRequestBodyProgress(body,
+					func(bytesTransferred int64) {
+						diff := bytesTransferred - blockProgress
+						blockProgress = bytesTransferred
+						progressLock.Lock() // 1 goroutine at a time gets a progress report
+						progress += diff
+						o.Progress(progress)
+						progressLock.Unlock()
+					})
+			}
+
+			// Block IDs are unique values to avoid issue if 2+ clients are uploading blocks
+			// at the same time causing PutBlockList to get a mix of blocks from all the clients.
+			blockIDList[blockNum] = base64.StdEncoding.EncodeToString(newUUID().bytes())
+			_, err := blockBlobURL.StageBlock(ctx, blockIDList[blockNum], body, o.AccessConditions.LeaseAccessConditions, nil, o.ClientProvidedKeyOptions)
+			return err
+		},
+	})
+	if err != nil {
+		return nil, err
+	}
+	// All put blocks were successful, call Put Block List to finalize the blob
+	return blockBlobURL.CommitBlockList(ctx, blockIDList, o.BlobHTTPHeaders, o.Metadata, o.AccessConditions, o.BlobAccessTier, o.BlobTagsMap, o.ClientProvidedKeyOptions)
+}
+
+// The UUID reserved variants.
+const (
+	reservedNCS       byte = 0x80
+	reservedRFC4122   byte = 0x40
+	reservedMicrosoft byte = 0x20
+	reservedFuture    byte = 0x00
+)
+
+type uuid [16]byte
+
+// NewUUID returns a new uuid using RFC 4122 algorithm.
+func newUUID() (u uuid) {
+	u = uuid{}
+	// Set all bits to randomly (or pseudo-randomly) chosen values.
+	rand.Read(u[:])
+	u[8] = (u[8] | reservedRFC4122) & 0x7F // u.setVariant(ReservedRFC4122)
+
+	var version byte = 4
+	u[6] = (u[6] & 0xF) | (version << 4) // u.setVersion(4)
+	return
+}
+
+// String returns an unparsed version of the generated UUID sequence.
+func (u uuid) String() string {
+	return fmt.Sprintf("%x-%x-%x-%x-%x", u[0:4], u[4:6], u[6:8], u[8:10], u[10:])
+}
+
+func (u uuid) bytes() []byte {
+	return u[:]
+}
diff --git a/weed/remote_storage/azure/azure_storage_client.go b/weed/remote_storage/azure/azure_storage_client.go
new file mode 100644
index 000000000..2fab3adb7
--- /dev/null
+++ b/weed/remote_storage/azure/azure_storage_client.go
@@ -0,0 +1,252 @@
+package azure
+
+import (
+	"context"
+	"fmt"
+	"github.com/Azure/azure-storage-blob-go/azblob"
+	"github.com/chrislusf/seaweedfs/weed/filer"
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/remote_pb"
+	"github.com/chrislusf/seaweedfs/weed/remote_storage"
+	"github.com/chrislusf/seaweedfs/weed/util"
+	"io"
+	"io/ioutil"
+	"net/url"
+	"os"
+	"reflect"
+)
+
+func init() {
+	remote_storage.RemoteStorageClientMakers["azure"] = new(azureRemoteStorageMaker)
+}
+
+type azureRemoteStorageMaker struct{}
+
+func (s azureRemoteStorageMaker) HasBucket() bool {
+	return true
+}
+
+func (s azureRemoteStorageMaker) Make(conf *remote_pb.RemoteConf) (remote_storage.RemoteStorageClient, error) {
+
+	client := &azureRemoteStorageClient{
+		conf: conf,
+	}
+
+	accountName, accountKey := conf.AzureAccountName, conf.AzureAccountKey
+	if len(accountName) == 0 || len(accountKey) == 0 {
+		accountName, accountKey = os.Getenv("AZURE_STORAGE_ACCOUNT"), os.Getenv("AZURE_STORAGE_ACCESS_KEY")
+		if len(accountName) == 0 || len(accountKey) == 0 {
+			return nil, fmt.Errorf("either AZURE_STORAGE_ACCOUNT or AZURE_STORAGE_ACCESS_KEY environment variable is not set")
+		}
+	}
+
+	// Use your Storage account's name and key to create a credential object.
+	credential, err := azblob.NewSharedKeyCredential(accountName, accountKey)
+	if err != nil {
+		return nil, fmt.Errorf("invalid Azure credential with account name:%s: %v", accountName, err)
+	}
+
+	// Create a request pipeline that is used to process HTTP(S) requests and responses.
+	p := azblob.NewPipeline(credential, azblob.PipelineOptions{})
+
+	// Create an ServiceURL object that wraps the service URL and a request pipeline.
+	u, _ := url.Parse(fmt.Sprintf("https://%s.blob.core.windows.net", accountName))
+	client.serviceURL = azblob.NewServiceURL(*u, p)
+
+	return client, nil
+}
+
+type azureRemoteStorageClient struct {
+	conf       *remote_pb.RemoteConf
+	serviceURL azblob.ServiceURL
+}
+
+var _ = remote_storage.RemoteStorageClient(&azureRemoteStorageClient{})
+
+func (az *azureRemoteStorageClient) Traverse(loc *remote_pb.RemoteStorageLocation, visitFn remote_storage.VisitFunc) (err error) {
+
+	pathKey := loc.Path[1:]
+	containerURL := az.serviceURL.NewContainerURL(loc.Bucket)
+
+	// List the container that we have created above
+	for marker := (azblob.Marker{}); marker.NotDone(); {
+		// Get a result segment starting with the blob indicated by the current Marker.
+		listBlob, err := containerURL.ListBlobsFlatSegment(context.Background(), marker, azblob.ListBlobsSegmentOptions{
+			Prefix: pathKey,
+		})
+		if err != nil {
+			return fmt.Errorf("azure traverse %s%s: %v", loc.Bucket, loc.Path, err)
+		}
+
+		// ListBlobs returns the start of the next segment; you MUST use this to get
+		// the next segment (after processing the current result segment).
+		marker = listBlob.NextMarker
+
+		// Process the blobs returned in this result segment (if the segment is empty, the loop body won't execute)
+		for _, blobInfo := range listBlob.Segment.BlobItems {
+			key := blobInfo.Name
+			key = "/" + key
+			dir, name := util.FullPath(key).DirAndName()
+			err = visitFn(dir, name, false, &filer_pb.RemoteEntry{
+				RemoteMtime: blobInfo.Properties.LastModified.Unix(),
+				RemoteSize:  *blobInfo.Properties.ContentLength,
+				RemoteETag:  string(blobInfo.Properties.Etag),
+				StorageName: az.conf.Name,
+			})
+			if err != nil {
+				return fmt.Errorf("azure processing %s%s: %v", loc.Bucket, loc.Path, err)
+			}
+		}
+	}
+
+	return
+}
+func (az *azureRemoteStorageClient) ReadFile(loc *remote_pb.RemoteStorageLocation, offset int64, size int64) (data []byte, err error) {
+
+	key := loc.Path[1:]
+	containerURL := az.serviceURL.NewContainerURL(loc.Bucket)
+	blobURL := containerURL.NewBlockBlobURL(key)
+
+	downloadResponse, readErr := blobURL.Download(context.Background(), offset, size, azblob.BlobAccessConditions{}, false, azblob.ClientProvidedKeyOptions{})
+	if readErr != nil {
+		return nil, readErr
+	}
+	// NOTE: automatically retries are performed if the connection fails
+	bodyStream := downloadResponse.Body(azblob.RetryReaderOptions{MaxRetryRequests: 20})
+	defer bodyStream.Close()
+
+	data, err = ioutil.ReadAll(bodyStream)
+
+	if err != nil {
+		return nil, fmt.Errorf("failed to download file %s%s: %v", loc.Bucket, loc.Path, err)
+	}
+
+	return
+}
+
+func (az *azureRemoteStorageClient) WriteDirectory(loc *remote_pb.RemoteStorageLocation, entry *filer_pb.Entry) (err error) {
+	return nil
+}
+
+func (az *azureRemoteStorageClient) RemoveDirectory(loc *remote_pb.RemoteStorageLocation) (err error) {
+	return nil
+}
+
+func (az *azureRemoteStorageClient) WriteFile(loc *remote_pb.RemoteStorageLocation, entry *filer_pb.Entry, reader io.Reader) (remoteEntry *filer_pb.RemoteEntry, err error) {
+
+	key := loc.Path[1:]
+	containerURL := az.serviceURL.NewContainerURL(loc.Bucket)
+	blobURL := containerURL.NewBlockBlobURL(key)
+
+	readerAt, ok := reader.(io.ReaderAt)
+	if !ok {
+		return nil, fmt.Errorf("unexpected reader: readerAt expected")
+	}
+	fileSize := int64(filer.FileSize(entry))
+
+	_, err = uploadReaderAtToBlockBlob(context.Background(), readerAt, fileSize, blobURL, azblob.UploadToBlockBlobOptions{
+		BlockSize:   4 * 1024 * 1024,
+		Parallelism: 16})
+	if err != nil {
+		return nil, fmt.Errorf("azure upload to %s%s: %v", loc.Bucket, loc.Path, err)
+	}
+
+	metadata := toMetadata(entry.Extended)
+	if len(metadata) > 0 {
+		_, err = blobURL.SetMetadata(context.Background(), metadata, azblob.BlobAccessConditions{}, azblob.ClientProvidedKeyOptions{})
+		if err != nil {
+			return nil, fmt.Errorf("azure set metadata on %s%s: %v", loc.Bucket, loc.Path, err)
+		}
+	}
+
+	// read back the remote entry
+	return az.readFileRemoteEntry(loc)
+
+}
+
+func (az *azureRemoteStorageClient) readFileRemoteEntry(loc *remote_pb.RemoteStorageLocation) (*filer_pb.RemoteEntry, error) {
+	key := loc.Path[1:]
+	containerURL := az.serviceURL.NewContainerURL(loc.Bucket)
+	blobURL := containerURL.NewBlockBlobURL(key)
+
+	attr, err := blobURL.GetProperties(context.Background(), azblob.BlobAccessConditions{}, azblob.ClientProvidedKeyOptions{})
+
+	if err != nil {
+		return nil, err
+	}
+
+	return &filer_pb.RemoteEntry{
+		RemoteMtime: attr.LastModified().Unix(),
+		RemoteSize:  attr.ContentLength(),
+		RemoteETag:  string(attr.ETag()),
+		StorageName: az.conf.Name,
+	}, nil
+
+}
+
+func toMetadata(attributes map[string][]byte) map[string]string {
+	metadata := make(map[string]string)
+	for k, v := range attributes {
+		metadata[k] = string(v)
+	}
+	return metadata
+}
+
+func (az *azureRemoteStorageClient) UpdateFileMetadata(loc *remote_pb.RemoteStorageLocation, oldEntry *filer_pb.Entry, newEntry *filer_pb.Entry) (err error) {
+	if reflect.DeepEqual(oldEntry.Extended, newEntry.Extended) {
+		return nil
+	}
+	metadata := toMetadata(newEntry.Extended)
+
+	key := loc.Path[1:]
+	containerURL := az.serviceURL.NewContainerURL(loc.Bucket)
+
+	_, err = containerURL.NewBlobURL(key).SetMetadata(context.Background(), metadata, azblob.BlobAccessConditions{}, azblob.ClientProvidedKeyOptions{})
+
+	return
+}
+
+func (az *azureRemoteStorageClient) DeleteFile(loc *remote_pb.RemoteStorageLocation) (err error) {
+	key := loc.Path[1:]
+	containerURL := az.serviceURL.NewContainerURL(loc.Bucket)
+	if _, err = containerURL.NewBlobURL(key).Delete(context.Background(),
+		azblob.DeleteSnapshotsOptionInclude, azblob.BlobAccessConditions{}); err != nil {
+		return fmt.Errorf("azure delete %s%s: %v", loc.Bucket, loc.Path, err)
+	}
+	return
+}
+
+func (az *azureRemoteStorageClient) ListBuckets() (buckets []*remote_storage.Bucket, err error) {
+	ctx := context.Background()
+	for containerMarker := (azblob.Marker{}); containerMarker.NotDone(); {
+		listContainer, err := az.serviceURL.ListContainersSegment(ctx, containerMarker, azblob.ListContainersSegmentOptions{})
+		if err == nil {
+			for _, v := range listContainer.ContainerItems {
+				buckets = append(buckets, &remote_storage.Bucket{
+					Name:      v.Name,
+					CreatedAt: v.Properties.LastModified,
+				})
+			}
+		} else {
+			return buckets, err
+		}
+		containerMarker = listContainer.NextMarker
+	}
+	return
+}
+
+func (az *azureRemoteStorageClient) CreateBucket(name string) (err error) {
+	containerURL := az.serviceURL.NewContainerURL(name)
+	if _, err = containerURL.Create(context.Background(), azblob.Metadata{}, azblob.PublicAccessNone); err != nil {
+		return fmt.Errorf("create bucket %s: %v", name, err)
+	}
+	return
+}
+
+func (az *azureRemoteStorageClient) DeleteBucket(name string) (err error) {
+	containerURL := az.serviceURL.NewContainerURL(name)
+	if _, err = containerURL.Delete(context.Background(), azblob.ContainerAccessConditions{}); err != nil {
+		return fmt.Errorf("delete bucket %s: %v", name, err)
+	}
+	return
+}
diff --git a/weed/remote_storage/gcs/gcs_storage_client.go b/weed/remote_storage/gcs/gcs_storage_client.go
new file mode 100644
index 000000000..fce7ba945
--- /dev/null
+++ b/weed/remote_storage/gcs/gcs_storage_client.go
@@ -0,0 +1,238 @@
+package gcs
+
+import (
+	"cloud.google.com/go/storage"
+	"context"
+	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/remote_pb"
+	"github.com/chrislusf/seaweedfs/weed/remote_storage"
+	"github.com/chrislusf/seaweedfs/weed/util"
+	"google.golang.org/api/iterator"
+	"google.golang.org/api/option"
+	"io"
+	"io/ioutil"
+	"os"
+	"reflect"
+)
+
+func init() {
+	remote_storage.RemoteStorageClientMakers["gcs"] = new(gcsRemoteStorageMaker)
+}
+
+type gcsRemoteStorageMaker struct{}
+
+func (s gcsRemoteStorageMaker) HasBucket() bool {
+	return true
+}
+
+func (s gcsRemoteStorageMaker) Make(conf *remote_pb.RemoteConf) (remote_storage.RemoteStorageClient, error) {
+	client := &gcsRemoteStorageClient{
+		conf: conf,
+	}
+
+	googleApplicationCredentials := conf.GcsGoogleApplicationCredentials
+
+	if googleApplicationCredentials == "" {
+		found := false
+		googleApplicationCredentials, found = os.LookupEnv("GOOGLE_APPLICATION_CREDENTIALS")
+		if !found {
+			return nil, fmt.Errorf("need to specific GOOGLE_APPLICATION_CREDENTIALS env variable")
+		}
+	}
+
+	projectID := conf.GcsProjectId
+	if projectID == "" {
+		found := false
+		projectID, found = os.LookupEnv("GOOGLE_CLOUD_PROJECT")
+		if !found {
+			glog.Warningf("need to specific GOOGLE_CLOUD_PROJECT env variable")
+		}
+	}
+
+	googleApplicationCredentials = util.ResolvePath(googleApplicationCredentials)
+
+	c, err := storage.NewClient(context.Background(), option.WithCredentialsFile(googleApplicationCredentials))
+	if err != nil {
+		return nil, fmt.Errorf("failed to create client: %v", err)
+	}
+
+	client.client = c
+	client.projectID = projectID
+	return client, nil
+}
+
+type gcsRemoteStorageClient struct {
+	conf      *remote_pb.RemoteConf
+	client    *storage.Client
+	projectID string
+}
+
+var _ = remote_storage.RemoteStorageClient(&gcsRemoteStorageClient{})
+
+func (gcs *gcsRemoteStorageClient) Traverse(loc *remote_pb.RemoteStorageLocation, visitFn remote_storage.VisitFunc) (err error) {
+
+	pathKey := loc.Path[1:]
+
+	objectIterator := gcs.client.Bucket(loc.Bucket).Objects(context.Background(), &storage.Query{
+		Delimiter: "",
+		Prefix:    pathKey,
+		Versions:  false,
+	})
+
+	var objectAttr *storage.ObjectAttrs
+	for err == nil {
+		objectAttr, err = objectIterator.Next()
+		if err != nil {
+			if err == iterator.Done {
+				return nil
+			}
+			return err
+		}
+
+		key := objectAttr.Name
+		key = "/" + key
+		dir, name := util.FullPath(key).DirAndName()
+		err = visitFn(dir, name, false, &filer_pb.RemoteEntry{
+			RemoteMtime: objectAttr.Updated.Unix(),
+			RemoteSize:  objectAttr.Size,
+			RemoteETag:  objectAttr.Etag,
+			StorageName: gcs.conf.Name,
+		})
+	}
+	return
+}
+func (gcs *gcsRemoteStorageClient) ReadFile(loc *remote_pb.RemoteStorageLocation, offset int64, size int64) (data []byte, err error) {
+
+	key := loc.Path[1:]
+	rangeReader, readErr := gcs.client.Bucket(loc.Bucket).Object(key).NewRangeReader(context.Background(), offset, size)
+	if readErr != nil {
+		return nil, readErr
+	}
+	data, err = ioutil.ReadAll(rangeReader)
+
+	if err != nil {
+		return nil, fmt.Errorf("failed to download file %s%s: %v", loc.Bucket, loc.Path, err)
+	}
+
+	return
+}
+
+func (gcs *gcsRemoteStorageClient) WriteDirectory(loc *remote_pb.RemoteStorageLocation, entry *filer_pb.Entry) (err error) {
+	return nil
+}
+
+func (gcs *gcsRemoteStorageClient) RemoveDirectory(loc *remote_pb.RemoteStorageLocation) (err error) {
+	return nil
+}
+
+func (gcs *gcsRemoteStorageClient) WriteFile(loc *remote_pb.RemoteStorageLocation, entry *filer_pb.Entry, reader io.Reader) (remoteEntry *filer_pb.RemoteEntry, err error) {
+
+	key := loc.Path[1:]
+
+	metadata := toMetadata(entry.Extended)
+	wc := gcs.client.Bucket(loc.Bucket).Object(key).NewWriter(context.Background())
+	wc.Metadata = metadata
+	if _, err = io.Copy(wc, reader); err != nil {
+		return nil, fmt.Errorf("upload to gcs %s/%s%s: %v", loc.Name, loc.Bucket, loc.Path, err)
+	}
+	if err = wc.Close(); err != nil {
+		return nil, fmt.Errorf("close gcs %s/%s%s: %v", loc.Name, loc.Bucket, loc.Path, err)
+	}
+
+	// read back the remote entry
+	return gcs.readFileRemoteEntry(loc)
+
+}
+
+func (gcs *gcsRemoteStorageClient) readFileRemoteEntry(loc *remote_pb.RemoteStorageLocation) (*filer_pb.RemoteEntry, error) {
+	key := loc.Path[1:]
+	attr, err := gcs.client.Bucket(loc.Bucket).Object(key).Attrs(context.Background())
+
+	if err != nil {
+		return nil, err
+	}
+
+	return &filer_pb.RemoteEntry{
+		RemoteMtime: attr.Updated.Unix(),
+		RemoteSize:  attr.Size,
+		RemoteETag:  attr.Etag,
+		StorageName: gcs.conf.Name,
+	}, nil
+
+}
+
+func toMetadata(attributes map[string][]byte) map[string]string {
+	metadata := make(map[string]string)
+	for k, v := range attributes {
+		metadata[k] = string(v)
+	}
+	return metadata
+}
+
+func (gcs *gcsRemoteStorageClient) UpdateFileMetadata(loc *remote_pb.RemoteStorageLocation, oldEntry *filer_pb.Entry, newEntry *filer_pb.Entry) (err error) {
+	if reflect.DeepEqual(oldEntry.Extended, newEntry.Extended) {
+		return nil
+	}
+	metadata := toMetadata(newEntry.Extended)
+
+	key := loc.Path[1:]
+
+	if len(metadata) > 0 {
+		_, err = gcs.client.Bucket(loc.Bucket).Object(key).Update(context.Background(), storage.ObjectAttrsToUpdate{
+			Metadata: metadata,
+		})
+	} else {
+		// no way to delete the metadata yet
+	}
+
+	return
+}
+func (gcs *gcsRemoteStorageClient) DeleteFile(loc *remote_pb.RemoteStorageLocation) (err error) {
+	key := loc.Path[1:]
+	if err = gcs.client.Bucket(loc.Bucket).Object(key).Delete(context.Background()); err != nil {
+		return fmt.Errorf("gcs delete %s%s: %v", loc.Bucket, key, err)
+	}
+	return
+}
+
+func (gcs *gcsRemoteStorageClient) ListBuckets() (buckets []*remote_storage.Bucket, err error) {
+	if gcs.projectID == "" {
+		return nil, fmt.Errorf("gcs project id or GOOGLE_CLOUD_PROJECT env variable not set")
+	}
+	iter := gcs.client.Buckets(context.Background(), gcs.projectID)
+	for {
+		b, err := iter.Next()
+		if err == iterator.Done {
+			break
+		}
+		if err != nil {
+			return buckets, err
+		}
+		buckets = append(buckets, &remote_storage.Bucket{
+			Name:      b.Name,
+			CreatedAt: b.Created,
+		})
+	}
+	return
+}
+
+func (gcs *gcsRemoteStorageClient) CreateBucket(name string) (err error) {
+	if gcs.projectID == "" {
+		return fmt.Errorf("gcs project id or GOOGLE_CLOUD_PROJECT env variable not set")
+	}
+	err = gcs.client.Bucket(name).Create(context.Background(), gcs.projectID, &storage.BucketAttrs{})
+	if err != nil {
+		return fmt.Errorf("create bucket %s: %v", name, err)
+	}
+	return
+}
+
+func (gcs *gcsRemoteStorageClient) DeleteBucket(name string) (err error) {
+	err = gcs.client.Bucket(name).Delete(context.Background())
+	if err != nil {
+		return fmt.Errorf("delete bucket %s: %v", name, err)
+	}
+	return
+}
diff --git a/weed/remote_storage/hdfs/hdfs_kerberos.go b/weed/remote_storage/hdfs/hdfs_kerberos.go
new file mode 100644
index 000000000..50abc0ad5
--- /dev/null
+++ b/weed/remote_storage/hdfs/hdfs_kerberos.go
@@ -0,0 +1,55 @@
+package hdfs
+
+import (
+	"fmt"
+	"os"
+	"os/user"
+	"strings"
+
+	krb "github.com/jcmturner/gokrb5/v8/client"
+	"github.com/jcmturner/gokrb5/v8/config"
+	"github.com/jcmturner/gokrb5/v8/credentials"
+)
+
+// copy-paste from https://github.com/colinmarc/hdfs/blob/master/cmd/hdfs/kerberos.go
+func getKerberosClient() (*krb.Client, error) {
+	configPath := os.Getenv("KRB5_CONFIG")
+	if configPath == "" {
+		configPath = "/etc/krb5.conf"
+	}
+
+	cfg, err := config.Load(configPath)
+	if err != nil {
+		return nil, err
+	}
+
+	// Determine the ccache location from the environment, falling back to the
+	// default location.
+	ccachePath := os.Getenv("KRB5CCNAME")
+	if strings.Contains(ccachePath, ":") {
+		if strings.HasPrefix(ccachePath, "FILE:") {
+			ccachePath = strings.SplitN(ccachePath, ":", 2)[1]
+		} else {
+			return nil, fmt.Errorf("unusable ccache: %s", ccachePath)
+		}
+	} else if ccachePath == "" {
+		u, err := user.Current()
+		if err != nil {
+			return nil, err
+		}
+
+		ccachePath = fmt.Sprintf("/tmp/krb5cc_%s", u.Uid)
+	}
+
+	ccache, err := credentials.LoadCCache(ccachePath)
+	if err != nil {
+		return nil, err
+	}
+
+	client, err := krb.NewFromCCache(ccache, cfg)
+	if err != nil {
+		return nil, err
+	}
+
+	return client, nil
+}
diff --git a/weed/remote_storage/hdfs/hdfs_storage_client.go b/weed/remote_storage/hdfs/hdfs_storage_client.go
new file mode 100644
index 000000000..4d76ac0ba
--- /dev/null
+++ b/weed/remote_storage/hdfs/hdfs_storage_client.go
@@ -0,0 +1,191 @@
+package hdfs
+
+import (
+	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/remote_pb"
+	"github.com/chrislusf/seaweedfs/weed/remote_storage"
+	"github.com/chrislusf/seaweedfs/weed/util"
+	"github.com/colinmarc/hdfs/v2"
+	"io"
+	"os"
+	"path"
+)
+
+func init() {
+	remote_storage.RemoteStorageClientMakers["hdfs"] = new(hdfsRemoteStorageMaker)
+}
+
+type hdfsRemoteStorageMaker struct{}
+
+func (s hdfsRemoteStorageMaker) HasBucket() bool {
+	return false
+}
+
+func (s hdfsRemoteStorageMaker) Make(conf *remote_pb.RemoteConf) (remote_storage.RemoteStorageClient, error) {
+	client := &hdfsRemoteStorageClient{
+		conf: conf,
+	}
+
+	options := hdfs.ClientOptions{
+		Addresses:           conf.HdfsNamenodes,
+		UseDatanodeHostname: false,
+	}
+
+	if conf.HdfsServicePrincipalName != "" {
+		var err error
+		options.KerberosClient, err = getKerberosClient()
+		if err != nil {
+			return nil, fmt.Errorf("get kerberos authentication: %s", err)
+		}
+		options.KerberosServicePrincipleName = conf.HdfsServicePrincipalName
+
+		if conf.HdfsDataTransferProtection != "" {
+			options.DataTransferProtection = conf.HdfsDataTransferProtection
+		}
+	} else {
+		options.User = conf.HdfsUsername
+	}
+
+	c, err := hdfs.NewClient(options)
+	if err != nil {
+		return nil, err
+	}
+
+	client.client = c
+	return client, nil
+}
+
+type hdfsRemoteStorageClient struct {
+	conf   *remote_pb.RemoteConf
+	client *hdfs.Client
+}
+
+var _ = remote_storage.RemoteStorageClient(&hdfsRemoteStorageClient{})
+
+func (c *hdfsRemoteStorageClient) Traverse(loc *remote_pb.RemoteStorageLocation, visitFn remote_storage.VisitFunc) (err error) {
+
+	return remote_storage.TraverseBfs(func(parentDir util.FullPath, visitFn remote_storage.VisitFunc) error {
+		children, err := c.client.ReadDir(string(parentDir))
+		if err != nil {
+			return err
+		}
+		for _, child := range children {
+			if err := visitFn(string(parentDir), child.Name(), child.IsDir(), &filer_pb.RemoteEntry{
+				StorageName:       c.conf.Name,
+				LastLocalSyncTsNs: 0,
+				RemoteETag:        "",
+				RemoteMtime:       child.ModTime().Unix(),
+				RemoteSize:        child.Size(),
+			}); err != nil {
+				return nil
+			}
+		}
+		return nil
+	}, util.FullPath(loc.Path), visitFn)
+
+}
+func (c *hdfsRemoteStorageClient) ReadFile(loc *remote_pb.RemoteStorageLocation, offset int64, size int64) (data []byte, err error) {
+
+	f, err := c.client.Open(loc.Path)
+	if err != nil {
+		return
+	}
+	defer f.Close()
+	data = make([]byte, size)
+	_, err = f.ReadAt(data, offset)
+
+	return
+
+}
+
+func (c *hdfsRemoteStorageClient) WriteDirectory(loc *remote_pb.RemoteStorageLocation, entry *filer_pb.Entry) (err error) {
+	return c.client.MkdirAll(loc.Path, os.FileMode(entry.Attributes.FileMode))
+}
+
+func (c *hdfsRemoteStorageClient) RemoveDirectory(loc *remote_pb.RemoteStorageLocation) (err error) {
+	return c.client.RemoveAll(loc.Path)
+}
+
+func (c *hdfsRemoteStorageClient) WriteFile(loc *remote_pb.RemoteStorageLocation, entry *filer_pb.Entry, reader io.Reader) (remoteEntry *filer_pb.RemoteEntry, err error) {
+
+	dirname := path.Dir(loc.Path)
+
+	// ensure parent directory
+	if err = c.client.MkdirAll(dirname, 0755); err != nil {
+		return
+	}
+
+	// remove existing file
+	info, err := c.client.Stat(loc.Path)
+	if err == nil {
+		err = c.client.Remove(loc.Path)
+		if err != nil {
+			return
+		}
+	}
+
+	// create new file
+	out, err := c.client.Create(loc.Path)
+	if err != nil {
+		return
+	}
+
+	cleanup := func() {
+		if removeErr := c.client.Remove(loc.Path); removeErr != nil {
+			glog.Errorf("clean up %s%s: %v", loc.Name, loc.Path, removeErr)
+		}
+	}
+
+	if _, err = io.Copy(out, reader); err != nil {
+		cleanup()
+		return
+	}
+
+	if err = out.Close(); err != nil {
+		cleanup()
+		return
+	}
+
+	info, err = c.client.Stat(loc.Path)
+	if err != nil {
+		return
+	}
+
+	return &filer_pb.RemoteEntry{
+		RemoteMtime: info.ModTime().Unix(),
+		RemoteSize:  info.Size(),
+		RemoteETag:  "",
+		StorageName: c.conf.Name,
+	}, nil
+
+}
+
+func (c *hdfsRemoteStorageClient) UpdateFileMetadata(loc *remote_pb.RemoteStorageLocation, oldEntry *filer_pb.Entry, newEntry *filer_pb.Entry) error {
+	if oldEntry.Attributes.FileMode != newEntry.Attributes.FileMode {
+		if err := c.client.Chmod(loc.Path, os.FileMode(newEntry.Attributes.FileMode)); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (c *hdfsRemoteStorageClient) DeleteFile(loc *remote_pb.RemoteStorageLocation) (err error) {
+	if err = c.client.Remove(loc.Path); err != nil {
+		return fmt.Errorf("hdfs delete %s: %v", loc.Path, err)
+	}
+	return
+}
+
+func (c *hdfsRemoteStorageClient) ListBuckets() (buckets []*remote_storage.Bucket, err error) {
+	return
+}
+
+func (c *hdfsRemoteStorageClient) CreateBucket(name string) (err error) {
+	return
+}
+
+func (c *hdfsRemoteStorageClient) DeleteBucket(name string) (err error) {
+	return
+}
diff --git a/weed/remote_storage/remote_storage.go b/weed/remote_storage/remote_storage.go
index bbc3eaa5b..d8d1e1f5c 100644
--- a/weed/remote_storage/remote_storage.go
+++ b/weed/remote_storage/remote_storage.go
@@ -3,13 +3,28 @@ package remote_storage
 import (
 	"fmt"
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/remote_pb"
+	"github.com/golang/protobuf/proto"
 	"io"
+	"sort"
 	"strings"
 	"sync"
+	"time"
 )
 
-func ParseLocation(remote string) (loc *filer_pb.RemoteStorageLocation) {
-	loc = &filer_pb.RemoteStorageLocation{}
+func ParseLocationName(remote string) (locationName string) {
+	if strings.HasSuffix(string(remote), "/") {
+		remote = remote[:len(remote)-1]
+	}
+	parts := strings.SplitN(string(remote), "/", 2)
+	if len(parts) >= 1 {
+		return parts[0]
+	}
+	return
+}
+
+func parseBucketLocation(remote string) (loc *remote_pb.RemoteStorageLocation) {
+	loc = &remote_pb.RemoteStorageLocation{}
 	if strings.HasSuffix(string(remote), "/") {
 		remote = remote[:len(remote)-1]
 	}
@@ -27,28 +42,98 @@ func ParseLocation(remote string) (loc *filer_pb.RemoteStorageLocation) {
 	return
 }
 
+func parseNoBucketLocation(remote string) (loc *remote_pb.RemoteStorageLocation) {
+	loc = &remote_pb.RemoteStorageLocation{}
+	if strings.HasSuffix(string(remote), "/") {
+		remote = remote[:len(remote)-1]
+	}
+	parts := strings.SplitN(string(remote), "/", 2)
+	if len(parts) >= 1 {
+		loc.Name = parts[0]
+	}
+	loc.Path = string(remote[len(loc.Name):])
+	if loc.Path == "" {
+		loc.Path = "/"
+	}
+	return
+}
+
+func FormatLocation(loc *remote_pb.RemoteStorageLocation) string {
+	if loc.Bucket == "" {
+		return fmt.Sprintf("%s%s", loc.Name, loc.Path)
+	}
+	return fmt.Sprintf("%s/%s%s", loc.Name, loc.Bucket, loc.Path)
+}
+
 type VisitFunc func(dir string, name string, isDirectory bool, remoteEntry *filer_pb.RemoteEntry) error
 
+type Bucket struct {
+	Name      string
+	CreatedAt time.Time
+}
+
 type RemoteStorageClient interface {
-	Traverse(loc *filer_pb.RemoteStorageLocation, visitFn VisitFunc) error
-	ReadFile(loc *filer_pb.RemoteStorageLocation, offset int64, size int64) (data []byte, err error)
-	WriteDirectory(loc *filer_pb.RemoteStorageLocation, entry *filer_pb.Entry) (err error)
-	WriteFile(loc *filer_pb.RemoteStorageLocation, entry *filer_pb.Entry, reader io.Reader) (remoteEntry *filer_pb.RemoteEntry, err error)
-	UpdateFileMetadata(loc *filer_pb.RemoteStorageLocation, entry *filer_pb.Entry) (err error)
-	DeleteFile(loc *filer_pb.RemoteStorageLocation) (err error)
+	Traverse(loc *remote_pb.RemoteStorageLocation, visitFn VisitFunc) error
+	ReadFile(loc *remote_pb.RemoteStorageLocation, offset int64, size int64) (data []byte, err error)
+	WriteDirectory(loc *remote_pb.RemoteStorageLocation, entry *filer_pb.Entry) (err error)
+	RemoveDirectory(loc *remote_pb.RemoteStorageLocation) (err error)
+	WriteFile(loc *remote_pb.RemoteStorageLocation, entry *filer_pb.Entry, reader io.Reader) (remoteEntry *filer_pb.RemoteEntry, err error)
+	UpdateFileMetadata(loc *remote_pb.RemoteStorageLocation, oldEntry *filer_pb.Entry, newEntry *filer_pb.Entry) (err error)
+	DeleteFile(loc *remote_pb.RemoteStorageLocation) (err error)
+	ListBuckets() ([]*Bucket, error)
+	CreateBucket(name string) (err error)
+	DeleteBucket(name string) (err error)
 }
 
 type RemoteStorageClientMaker interface {
-	Make(remoteConf *filer_pb.RemoteConf) (RemoteStorageClient, error)
+	Make(remoteConf *remote_pb.RemoteConf) (RemoteStorageClient, error)
+	HasBucket() bool
+}
+
+type CachedRemoteStorageClient struct {
+	*remote_pb.RemoteConf
+	RemoteStorageClient
 }
 
 var (
 	RemoteStorageClientMakers = make(map[string]RemoteStorageClientMaker)
-	remoteStorageClients      = make(map[string]RemoteStorageClient)
+	remoteStorageClients      = make(map[string]CachedRemoteStorageClient)
 	remoteStorageClientsLock  sync.Mutex
 )
 
-func makeRemoteStorageClient(remoteConf *filer_pb.RemoteConf) (RemoteStorageClient, error) {
+func GetAllRemoteStorageNames() string {
+	var storageNames []string
+	for k := range RemoteStorageClientMakers {
+		storageNames = append(storageNames, k)
+	}
+	sort.Strings(storageNames)
+	return strings.Join(storageNames, "|")
+}
+
+func GetRemoteStorageNamesHasBucket() string {
+	var storageNames []string
+	for k, m := range RemoteStorageClientMakers {
+		if m.HasBucket() {
+			storageNames = append(storageNames, k)
+		}
+	}
+	sort.Strings(storageNames)
+	return strings.Join(storageNames, "|")
+}
+
+func ParseRemoteLocation(remoteConfType string, remote string) (remoteStorageLocation *remote_pb.RemoteStorageLocation, err error) {
+	maker, found := RemoteStorageClientMakers[remoteConfType]
+	if !found {
+		return nil, fmt.Errorf("remote storage type %s not found", remoteConfType)
+	}
+
+	if !maker.HasBucket() {
+		return parseNoBucketLocation(remote), nil
+	}
+	return parseBucketLocation(remote), nil
+}
+
+func makeRemoteStorageClient(remoteConf *remote_pb.RemoteConf) (RemoteStorageClient, error) {
 	maker, found := RemoteStorageClientMakers[remoteConf.Type]
 	if !found {
 		return nil, fmt.Errorf("remote storage type %s not found", remoteConf.Type)
@@ -56,13 +141,13 @@ func makeRemoteStorageClient(remoteConf *filer_pb.RemoteConf) (RemoteStorageClie
 	return maker.Make(remoteConf)
 }
 
-func GetRemoteStorage(remoteConf *filer_pb.RemoteConf) (RemoteStorageClient, error) {
+func GetRemoteStorage(remoteConf *remote_pb.RemoteConf) (RemoteStorageClient, error) {
 	remoteStorageClientsLock.Lock()
 	defer remoteStorageClientsLock.Unlock()
 
 	existingRemoteStorageClient, found := remoteStorageClients[remoteConf.Name]
-	if found {
-		return existingRemoteStorageClient, nil
+	if found && proto.Equal(existingRemoteStorageClient.RemoteConf, remoteConf) {
+		return existingRemoteStorageClient.RemoteStorageClient, nil
 	}
 
 	newRemoteStorageClient, err := makeRemoteStorageClient(remoteConf)
@@ -70,7 +155,10 @@ func GetRemoteStorage(remoteConf *filer_pb.RemoteConf) (RemoteStorageClient, err
 		return nil, fmt.Errorf("make remote storage client %s: %v", remoteConf.Name, err)
 	}
 
-	remoteStorageClients[remoteConf.Name] = newRemoteStorageClient
+	remoteStorageClients[remoteConf.Name] = CachedRemoteStorageClient{
+		RemoteConf:          remoteConf,
+		RemoteStorageClient: newRemoteStorageClient,
+	}
 
 	return newRemoteStorageClient, nil
 }
diff --git a/weed/remote_storage/s3/aliyun.go b/weed/remote_storage/s3/aliyun.go
new file mode 100644
index 000000000..864e4d5d0
--- /dev/null
+++ b/weed/remote_storage/s3/aliyun.go
@@ -0,0 +1,49 @@
+package s3
+
+import (
+	"fmt"
+	"github.com/aws/aws-sdk-go/aws"
+	"github.com/aws/aws-sdk-go/aws/credentials"
+	"github.com/aws/aws-sdk-go/aws/session"
+	"github.com/aws/aws-sdk-go/service/s3"
+	"github.com/chrislusf/seaweedfs/weed/pb/remote_pb"
+	"github.com/chrislusf/seaweedfs/weed/remote_storage"
+	"github.com/chrislusf/seaweedfs/weed/util"
+	"os"
+)
+
+func init() {
+	remote_storage.RemoteStorageClientMakers["aliyun"] = new(AliyunRemoteStorageMaker)
+}
+
+type AliyunRemoteStorageMaker struct{}
+
+func (s AliyunRemoteStorageMaker) HasBucket() bool {
+	return true
+}
+
+func (s AliyunRemoteStorageMaker) Make(conf *remote_pb.RemoteConf) (remote_storage.RemoteStorageClient, error) {
+	client := &s3RemoteStorageClient{
+		conf: conf,
+	}
+	accessKey := util.Nvl(conf.AliyunAccessKey, os.Getenv("ALICLOUD_ACCESS_KEY_ID"))
+	secretKey := util.Nvl(conf.AliyunSecretKey, os.Getenv("ALICLOUD_ACCESS_KEY_SECRET"))
+
+	config := &aws.Config{
+		Endpoint:                      aws.String(conf.AliyunEndpoint),
+		Region:                        aws.String(conf.AliyunRegion),
+		S3ForcePathStyle:              aws.Bool(false),
+		S3DisableContentMD5Validation: aws.Bool(true),
+	}
+	if accessKey != "" && secretKey != "" {
+		config.Credentials = credentials.NewStaticCredentials(accessKey, secretKey, "")
+	}
+
+	sess, err := session.NewSession(config)
+	if err != nil {
+		return nil, fmt.Errorf("create aliyun session: %v", err)
+	}
+	sess.Handlers.Build.PushFront(skipSha256PayloadSigning)
+	client.conn = s3.New(sess)
+	return client, nil
+}
diff --git a/weed/remote_storage/s3/backblaze.go b/weed/remote_storage/s3/backblaze.go
new file mode 100644
index 000000000..ca24e85d2
--- /dev/null
+++ b/weed/remote_storage/s3/backblaze.go
@@ -0,0 +1,44 @@
+package s3
+
+import (
+	"fmt"
+	"github.com/aws/aws-sdk-go/aws"
+	"github.com/aws/aws-sdk-go/aws/credentials"
+	"github.com/aws/aws-sdk-go/aws/session"
+	"github.com/aws/aws-sdk-go/service/s3"
+	"github.com/chrislusf/seaweedfs/weed/pb/remote_pb"
+	"github.com/chrislusf/seaweedfs/weed/remote_storage"
+)
+
+func init() {
+	remote_storage.RemoteStorageClientMakers["b2"] = new(BackBlazeRemoteStorageMaker)
+}
+
+type BackBlazeRemoteStorageMaker struct{}
+
+func (s BackBlazeRemoteStorageMaker) HasBucket() bool {
+	return true
+}
+
+func (s BackBlazeRemoteStorageMaker) Make(conf *remote_pb.RemoteConf) (remote_storage.RemoteStorageClient, error) {
+	client := &s3RemoteStorageClient{
+		conf: conf,
+	}
+	config := &aws.Config{
+		Endpoint:                      aws.String(conf.BackblazeEndpoint),
+		Region:                        aws.String("us-west-002"),
+		S3ForcePathStyle:              aws.Bool(true),
+		S3DisableContentMD5Validation: aws.Bool(true),
+	}
+	if conf.BackblazeKeyId != "" && conf.BackblazeApplicationKey != "" {
+		config.Credentials = credentials.NewStaticCredentials(conf.BackblazeKeyId, conf.BackblazeApplicationKey, "")
+	}
+
+	sess, err := session.NewSession(config)
+	if err != nil {
+		return nil, fmt.Errorf("create backblaze session: %v", err)
+	}
+	sess.Handlers.Build.PushFront(skipSha256PayloadSigning)
+	client.conn = s3.New(sess)
+	return client, nil
+}
diff --git a/weed/remote_storage/s3/baidu.go b/weed/remote_storage/s3/baidu.go
new file mode 100644
index 000000000..6021c9330
--- /dev/null
+++ b/weed/remote_storage/s3/baidu.go
@@ -0,0 +1,49 @@
+package s3
+
+import (
+	"fmt"
+	"github.com/aws/aws-sdk-go/aws"
+	"github.com/aws/aws-sdk-go/aws/credentials"
+	"github.com/aws/aws-sdk-go/aws/session"
+	"github.com/aws/aws-sdk-go/service/s3"
+	"github.com/chrislusf/seaweedfs/weed/pb/remote_pb"
+	"github.com/chrislusf/seaweedfs/weed/remote_storage"
+	"github.com/chrislusf/seaweedfs/weed/util"
+	"os"
+)
+
+func init() {
+	remote_storage.RemoteStorageClientMakers["baidu"] = new(BaiduRemoteStorageMaker)
+}
+
+type BaiduRemoteStorageMaker struct{}
+
+func (s BaiduRemoteStorageMaker) HasBucket() bool {
+	return true
+}
+
+func (s BaiduRemoteStorageMaker) Make(conf *remote_pb.RemoteConf) (remote_storage.RemoteStorageClient, error) {
+	client := &s3RemoteStorageClient{
+		conf: conf,
+	}
+	accessKey := util.Nvl(conf.BaiduAccessKey, os.Getenv("BDCLOUD_ACCESS_KEY"))
+	secretKey := util.Nvl(conf.BaiduSecretKey, os.Getenv("BDCLOUD_SECRET_KEY"))
+
+	config := &aws.Config{
+		Endpoint:                      aws.String(conf.BaiduEndpoint),
+		Region:                        aws.String(conf.BaiduRegion),
+		S3ForcePathStyle:              aws.Bool(true),
+		S3DisableContentMD5Validation: aws.Bool(true),
+	}
+	if accessKey != "" && secretKey != "" {
+		config.Credentials = credentials.NewStaticCredentials(accessKey, secretKey, "")
+	}
+
+	sess, err := session.NewSession(config)
+	if err != nil {
+		return nil, fmt.Errorf("create baidu session: %v", err)
+	}
+	sess.Handlers.Build.PushFront(skipSha256PayloadSigning)
+	client.conn = s3.New(sess)
+	return client, nil
+}
diff --git a/weed/remote_storage/s3/filebase.go b/weed/remote_storage/s3/filebase.go
new file mode 100644
index 000000000..fd5200f1a
--- /dev/null
+++ b/weed/remote_storage/s3/filebase.go
@@ -0,0 +1,51 @@
+package s3
+
+import (
+	"fmt"
+	"github.com/aws/aws-sdk-go/aws"
+	"github.com/aws/aws-sdk-go/aws/credentials"
+	"github.com/aws/aws-sdk-go/aws/session"
+	v4 "github.com/aws/aws-sdk-go/aws/signer/v4"
+	"github.com/aws/aws-sdk-go/service/s3"
+	"github.com/chrislusf/seaweedfs/weed/pb/remote_pb"
+	"github.com/chrislusf/seaweedfs/weed/remote_storage"
+	"github.com/chrislusf/seaweedfs/weed/util"
+	"os"
+)
+
+func init() {
+	remote_storage.RemoteStorageClientMakers["filebase"] = new(FilebaseRemoteStorageMaker)
+}
+
+type FilebaseRemoteStorageMaker struct{}
+
+func (s FilebaseRemoteStorageMaker) HasBucket() bool {
+	return true
+}
+
+func (s FilebaseRemoteStorageMaker) Make(conf *remote_pb.RemoteConf) (remote_storage.RemoteStorageClient, error) {
+	client := &s3RemoteStorageClient{
+		conf: conf,
+	}
+	accessKey := util.Nvl(conf.FilebaseAccessKey, os.Getenv("AWS_ACCESS_KEY_ID"))
+	secretKey := util.Nvl(conf.FilebaseSecretKey, os.Getenv("AWS_SECRET_ACCESS_KEY"))
+
+	config := &aws.Config{
+		Endpoint:                      aws.String(conf.FilebaseEndpoint),
+		Region:                        aws.String("us-east-1"),
+		S3ForcePathStyle:              aws.Bool(true),
+		S3DisableContentMD5Validation: aws.Bool(true),
+	}
+	if accessKey != "" && secretKey != "" {
+		config.Credentials = credentials.NewStaticCredentials(accessKey, secretKey, "")
+	}
+
+	sess, err := session.NewSession(config)
+	if err != nil {
+		return nil, fmt.Errorf("create filebase session: %v", err)
+	}
+	sess.Handlers.Sign.PushBackNamed(v4.SignRequestHandler)
+	sess.Handlers.Build.PushFront(skipSha256PayloadSigning)
+	client.conn = s3.New(sess)
+	return client, nil
+}
diff --git a/weed/remote_storage/s3/s3_storage_client.go b/weed/remote_storage/s3/s3_storage_client.go
index 7c4d895ec..fc00bcfe5 100644
--- a/weed/remote_storage/s3/s3_storage_client.go
+++ b/weed/remote_storage/s3/s3_storage_client.go
@@ -4,15 +4,19 @@ import (
 	"fmt"
 	"github.com/aws/aws-sdk-go/aws"
 	"github.com/aws/aws-sdk-go/aws/credentials"
+	"github.com/aws/aws-sdk-go/aws/request"
 	"github.com/aws/aws-sdk-go/aws/session"
+	v4 "github.com/aws/aws-sdk-go/aws/signer/v4"
 	"github.com/aws/aws-sdk-go/service/s3"
 	"github.com/aws/aws-sdk-go/service/s3/s3iface"
 	"github.com/aws/aws-sdk-go/service/s3/s3manager"
 	"github.com/chrislusf/seaweedfs/weed/filer"
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/remote_pb"
 	"github.com/chrislusf/seaweedfs/weed/remote_storage"
 	"github.com/chrislusf/seaweedfs/weed/util"
 	"io"
+	"reflect"
 )
 
 func init() {
@@ -21,14 +25,19 @@ func init() {
 
 type s3RemoteStorageMaker struct{}
 
-func (s s3RemoteStorageMaker) Make(conf *filer_pb.RemoteConf) (remote_storage.RemoteStorageClient, error) {
+func (s s3RemoteStorageMaker) HasBucket() bool {
+	return true
+}
+
+func (s s3RemoteStorageMaker) Make(conf *remote_pb.RemoteConf) (remote_storage.RemoteStorageClient, error) {
 	client := &s3RemoteStorageClient{
 		conf: conf,
 	}
 	config := &aws.Config{
-		Region:           aws.String(conf.S3Region),
-		Endpoint:         aws.String(conf.S3Endpoint),
-		S3ForcePathStyle: aws.Bool(true),
+		Region:                        aws.String(conf.S3Region),
+		Endpoint:                      aws.String(conf.S3Endpoint),
+		S3ForcePathStyle:              aws.Bool(conf.S3ForcePathStyle),
+		S3DisableContentMD5Validation: aws.Bool(true),
 	}
 	if conf.S3AccessKey != "" && conf.S3SecretKey != "" {
 		config.Credentials = credentials.NewStaticCredentials(conf.S3AccessKey, conf.S3SecretKey, "")
@@ -38,18 +47,25 @@ func (s s3RemoteStorageMaker) Make(conf *filer_pb.RemoteConf) (remote_storage.Re
 	if err != nil {
 		return nil, fmt.Errorf("create aws session: %v", err)
 	}
+	if conf.S3V4Signature {
+		sess.Handlers.Sign.PushBackNamed(v4.SignRequestHandler)
+	}
+	sess.Handlers.Build.PushBack(func(r *request.Request) {
+		r.HTTPRequest.Header.Set("User-Agent", "SeaweedFS/"+util.VERSION_NUMBER)
+	})
+	sess.Handlers.Build.PushFront(skipSha256PayloadSigning)
 	client.conn = s3.New(sess)
 	return client, nil
 }
 
 type s3RemoteStorageClient struct {
-	conf *filer_pb.RemoteConf
+	conf *remote_pb.RemoteConf
 	conn s3iface.S3API
 }
 
 var _ = remote_storage.RemoteStorageClient(&s3RemoteStorageClient{})
 
-func (s *s3RemoteStorageClient) Traverse(remote *filer_pb.RemoteStorageLocation, visitFn remote_storage.VisitFunc) (err error) {
+func (s *s3RemoteStorageClient) Traverse(remote *remote_pb.RemoteStorageLocation, visitFn remote_storage.VisitFunc) (err error) {
 
 	pathKey := remote.Path[1:]
 
@@ -91,7 +107,7 @@ func (s *s3RemoteStorageClient) Traverse(remote *filer_pb.RemoteStorageLocation,
 	}
 	return
 }
-func (s *s3RemoteStorageClient) ReadFile(loc *filer_pb.RemoteStorageLocation, offset int64, size int64) (data []byte, err error) {
+func (s *s3RemoteStorageClient) ReadFile(loc *remote_pb.RemoteStorageLocation, offset int64, size int64) (data []byte, err error) {
 	downloader := s3manager.NewDownloaderWithClient(s.conn, func(u *s3manager.Downloader) {
 		u.PartSize = int64(4 * 1024 * 1024)
 		u.Concurrency = 1
@@ -112,11 +128,15 @@ func (s *s3RemoteStorageClient) ReadFile(loc *filer_pb.RemoteStorageLocation, of
 	return writerAt.Bytes(), nil
 }
 
-func (s *s3RemoteStorageClient) WriteDirectory(loc *filer_pb.RemoteStorageLocation, entry *filer_pb.Entry) (err error) {
+func (s *s3RemoteStorageClient) WriteDirectory(loc *remote_pb.RemoteStorageLocation, entry *filer_pb.Entry) (err error) {
+	return nil
+}
+
+func (s *s3RemoteStorageClient) RemoveDirectory(loc *remote_pb.RemoteStorageLocation) (err error) {
 	return nil
 }
 
-func (s *s3RemoteStorageClient) WriteFile(loc *filer_pb.RemoteStorageLocation, entry *filer_pb.Entry, reader io.Reader) (remoteEntry *filer_pb.RemoteEntry, err error) {
+func (s *s3RemoteStorageClient) WriteFile(loc *remote_pb.RemoteStorageLocation, entry *filer_pb.Entry, reader io.Reader) (remoteEntry *filer_pb.RemoteEntry, err error) {
 
 	fileSize := int64(filer.FileSize(entry))
 
@@ -128,7 +148,7 @@ func (s *s3RemoteStorageClient) WriteFile(loc *filer_pb.RemoteStorageLocation, e
 	// Create an uploader with the session and custom options
 	uploader := s3manager.NewUploaderWithClient(s.conn, func(u *s3manager.Uploader) {
 		u.PartSize = partSize
-		u.Concurrency = 5
+		u.Concurrency = 1
 	})
 
 	// process tagging
@@ -142,18 +162,16 @@ func (s *s3RemoteStorageClient) WriteFile(loc *filer_pb.RemoteStorageLocation, e
 
 	// Upload the file to S3.
 	_, err = uploader.Upload(&s3manager.UploadInput{
-		Bucket:               aws.String(loc.Bucket),
-		Key:                  aws.String(loc.Path[1:]),
-		Body:                 reader,
-		ACL:                  aws.String("private"),
-		ServerSideEncryption: aws.String("AES256"),
-		StorageClass:         aws.String("STANDARD_IA"),
-		Tagging:              aws.String(tags),
+		Bucket:       aws.String(loc.Bucket),
+		Key:          aws.String(loc.Path[1:]),
+		Body:         reader,
+		Tagging:      aws.String(tags),
+		StorageClass: aws.String(s.conf.S3StorageClass),
 	})
 
 	//in case it fails to upload
 	if err != nil {
-		return nil, fmt.Errorf("upload to s3 %s/%s%s: %v", loc.Name, loc.Bucket, loc.Path, err)
+		return nil, fmt.Errorf("upload to %s/%s%s: %v", loc.Name, loc.Bucket, loc.Path, err)
 	}
 
 	// read back the remote entry
@@ -172,7 +190,7 @@ func toTagging(attributes map[string][]byte) *s3.Tagging {
 	return tagging
 }
 
-func (s *s3RemoteStorageClient) readFileRemoteEntry(loc *filer_pb.RemoteStorageLocation) (*filer_pb.RemoteEntry, error) {
+func (s *s3RemoteStorageClient) readFileRemoteEntry(loc *remote_pb.RemoteStorageLocation) (*filer_pb.RemoteEntry, error) {
 	resp, err := s.conn.HeadObject(&s3.HeadObjectInput{
 		Bucket: aws.String(loc.Bucket),
 		Key:    aws.String(loc.Path[1:]),
@@ -190,13 +208,16 @@ func (s *s3RemoteStorageClient) readFileRemoteEntry(loc *filer_pb.RemoteStorageL
 
 }
 
-func (s *s3RemoteStorageClient) UpdateFileMetadata(loc *filer_pb.RemoteStorageLocation, entry *filer_pb.Entry) (err error) {
-	tagging := toTagging(entry.Extended)
+func (s *s3RemoteStorageClient) UpdateFileMetadata(loc *remote_pb.RemoteStorageLocation, oldEntry *filer_pb.Entry, newEntry *filer_pb.Entry) (err error) {
+	if reflect.DeepEqual(oldEntry.Extended, newEntry.Extended) {
+		return nil
+	}
+	tagging := toTagging(newEntry.Extended)
 	if len(tagging.TagSet) > 0 {
 		_, err = s.conn.PutObjectTagging(&s3.PutObjectTaggingInput{
 			Bucket:  aws.String(loc.Bucket),
 			Key:     aws.String(loc.Path[1:]),
-			Tagging: toTagging(entry.Extended),
+			Tagging: toTagging(newEntry.Extended),
 		})
 	} else {
 		_, err = s.conn.DeleteObjectTagging(&s3.DeleteObjectTaggingInput{
@@ -206,10 +227,52 @@ func (s *s3RemoteStorageClient) UpdateFileMetadata(loc *filer_pb.RemoteStorageLo
 	}
 	return
 }
-func (s *s3RemoteStorageClient) DeleteFile(loc *filer_pb.RemoteStorageLocation) (err error) {
+func (s *s3RemoteStorageClient) DeleteFile(loc *remote_pb.RemoteStorageLocation) (err error) {
 	_, err = s.conn.DeleteObject(&s3.DeleteObjectInput{
 		Bucket: aws.String(loc.Bucket),
 		Key:    aws.String(loc.Path[1:]),
 	})
 	return
 }
+
+func (s *s3RemoteStorageClient) ListBuckets() (buckets []*remote_storage.Bucket, err error) {
+	resp, err := s.conn.ListBuckets(&s3.ListBucketsInput{})
+	if err != nil {
+		return nil, fmt.Errorf("list buckets: %v", err)
+	}
+	for _, b := range resp.Buckets {
+		buckets = append(buckets, &remote_storage.Bucket{
+			Name:      *b.Name,
+			CreatedAt: *b.CreationDate,
+		})
+	}
+	return
+}
+
+func (s *s3RemoteStorageClient) CreateBucket(name string) (err error) {
+	_, err = s.conn.CreateBucket(&s3.CreateBucketInput{
+		ACL:                        nil,
+		Bucket:                     aws.String(name),
+		CreateBucketConfiguration:  nil,
+		GrantFullControl:           nil,
+		GrantRead:                  nil,
+		GrantReadACP:               nil,
+		GrantWrite:                 nil,
+		GrantWriteACP:              nil,
+		ObjectLockEnabledForBucket: nil,
+	})
+	if err != nil {
+		return fmt.Errorf("%s create bucket %s: %v", s.conf.Name, name, err)
+	}
+	return
+}
+
+func (s *s3RemoteStorageClient) DeleteBucket(name string) (err error) {
+	_, err = s.conn.DeleteBucket(&s3.DeleteBucketInput{
+		Bucket:                     aws.String(name),
+	})
+	if err != nil {
+		return fmt.Errorf("delete bucket %s: %v", name, err)
+	}
+	return
+}
diff --git a/weed/remote_storage/s3/storj.go b/weed/remote_storage/s3/storj.go
new file mode 100644
index 000000000..9e902515a
--- /dev/null
+++ b/weed/remote_storage/s3/storj.go
@@ -0,0 +1,49 @@
+package s3
+
+import (
+	"fmt"
+	"github.com/aws/aws-sdk-go/aws"
+	"github.com/aws/aws-sdk-go/aws/credentials"
+	"github.com/aws/aws-sdk-go/aws/session"
+	"github.com/aws/aws-sdk-go/service/s3"
+	"github.com/chrislusf/seaweedfs/weed/pb/remote_pb"
+	"github.com/chrislusf/seaweedfs/weed/remote_storage"
+	"github.com/chrislusf/seaweedfs/weed/util"
+	"os"
+)
+
+func init() {
+	remote_storage.RemoteStorageClientMakers["storj"] = new(StorjRemoteStorageMaker)
+}
+
+type StorjRemoteStorageMaker struct{}
+
+func (s StorjRemoteStorageMaker) HasBucket() bool {
+	return true
+}
+
+func (s StorjRemoteStorageMaker) Make(conf *remote_pb.RemoteConf) (remote_storage.RemoteStorageClient, error) {
+	client := &s3RemoteStorageClient{
+		conf: conf,
+	}
+	accessKey := util.Nvl(conf.StorjAccessKey, os.Getenv("AWS_ACCESS_KEY_ID"))
+	secretKey := util.Nvl(conf.StorjSecretKey, os.Getenv("AWS_SECRET_ACCESS_KEY"))
+
+	config := &aws.Config{
+		Endpoint:                      aws.String(conf.StorjEndpoint),
+		Region:                        aws.String("us-west-2"),
+		S3ForcePathStyle:              aws.Bool(true),
+		S3DisableContentMD5Validation: aws.Bool(true),
+	}
+	if accessKey != "" && secretKey != "" {
+		config.Credentials = credentials.NewStaticCredentials(accessKey, secretKey, "")
+	}
+
+	sess, err := session.NewSession(config)
+	if err != nil {
+		return nil, fmt.Errorf("create storj session: %v", err)
+	}
+	sess.Handlers.Build.PushFront(skipSha256PayloadSigning)
+	client.conn = s3.New(sess)
+	return client, nil
+}
diff --git a/weed/remote_storage/s3/tencent.go b/weed/remote_storage/s3/tencent.go
new file mode 100644
index 000000000..b7711b956
--- /dev/null
+++ b/weed/remote_storage/s3/tencent.go
@@ -0,0 +1,49 @@
+package s3
+
+import (
+	"fmt"
+	"github.com/aws/aws-sdk-go/aws"
+	"github.com/aws/aws-sdk-go/aws/credentials"
+	"github.com/aws/aws-sdk-go/aws/session"
+	"github.com/aws/aws-sdk-go/service/s3"
+	"github.com/chrislusf/seaweedfs/weed/pb/remote_pb"
+	"github.com/chrislusf/seaweedfs/weed/remote_storage"
+	"github.com/chrislusf/seaweedfs/weed/util"
+	"os"
+)
+
+func init() {
+	remote_storage.RemoteStorageClientMakers["tencent"] = new(TencentRemoteStorageMaker)
+}
+
+type TencentRemoteStorageMaker struct{}
+
+func (s TencentRemoteStorageMaker) HasBucket() bool {
+	return true
+}
+
+func (s TencentRemoteStorageMaker) Make(conf *remote_pb.RemoteConf) (remote_storage.RemoteStorageClient, error) {
+	client := &s3RemoteStorageClient{
+		conf: conf,
+	}
+	accessKey := util.Nvl(conf.TencentSecretId, os.Getenv("COS_SECRETID"))
+	secretKey := util.Nvl(conf.TencentSecretKey, os.Getenv("COS_SECRETKEY"))
+
+	config := &aws.Config{
+		Endpoint:                      aws.String(conf.TencentEndpoint),
+		Region:                        aws.String("us-west-2"),
+		S3ForcePathStyle:              aws.Bool(true),
+		S3DisableContentMD5Validation: aws.Bool(true),
+	}
+	if accessKey != "" && secretKey != "" {
+		config.Credentials = credentials.NewStaticCredentials(accessKey, secretKey, "")
+	}
+
+	sess, err := session.NewSession(config)
+	if err != nil {
+		return nil, fmt.Errorf("create tencent session: %v", err)
+	}
+	sess.Handlers.Build.PushFront(skipSha256PayloadSigning)
+	client.conn = s3.New(sess)
+	return client, nil
+}
diff --git a/weed/remote_storage/s3/wasabi.go b/weed/remote_storage/s3/wasabi.go
new file mode 100644
index 000000000..29cdf7395
--- /dev/null
+++ b/weed/remote_storage/s3/wasabi.go
@@ -0,0 +1,61 @@
+package s3
+
+import (
+	"fmt"
+	"github.com/aws/aws-sdk-go/aws"
+	"github.com/aws/aws-sdk-go/aws/credentials"
+	"github.com/aws/aws-sdk-go/aws/request"
+	"github.com/aws/aws-sdk-go/aws/session"
+	"github.com/aws/aws-sdk-go/service/s3"
+	"github.com/chrislusf/seaweedfs/weed/pb/remote_pb"
+	"github.com/chrislusf/seaweedfs/weed/remote_storage"
+	"github.com/chrislusf/seaweedfs/weed/util"
+)
+
+func init() {
+	remote_storage.RemoteStorageClientMakers["wasabi"] = new(WasabiRemoteStorageMaker)
+}
+
+type WasabiRemoteStorageMaker struct{}
+
+func (s WasabiRemoteStorageMaker) HasBucket() bool {
+	return true
+}
+
+func (s WasabiRemoteStorageMaker) Make(conf *remote_pb.RemoteConf) (remote_storage.RemoteStorageClient, error) {
+	client := &s3RemoteStorageClient{
+		conf: conf,
+	}
+	accessKey := util.Nvl(conf.WasabiAccessKey)
+	secretKey := util.Nvl(conf.WasabiSecretKey)
+
+	config := &aws.Config{
+		Endpoint:                      aws.String(conf.WasabiEndpoint),
+		Region:                        aws.String(conf.WasabiRegion),
+		S3ForcePathStyle:              aws.Bool(true),
+		S3DisableContentMD5Validation: aws.Bool(true),
+	}
+	if accessKey != "" && secretKey != "" {
+		config.Credentials = credentials.NewStaticCredentials(accessKey, secretKey, "")
+	}
+
+	sess, err := session.NewSession(config)
+	if err != nil {
+		return nil, fmt.Errorf("create wasabi session: %v", err)
+	}
+	sess.Handlers.Build.PushFront(skipSha256PayloadSigning)
+	client.conn = s3.New(sess)
+	return client, nil
+}
+
+var skipSha256PayloadSigning = func(r *request.Request) {
+	// see https://github.com/ceph/ceph/pull/15965/files
+	if r.ClientInfo.ServiceID != "S3" {
+		return
+	}
+	if r.Operation.Name == "PutObject" || r.Operation.Name == "UploadPart" {
+		if len(r.HTTPRequest.Header.Get("X-Amz-Content-Sha256")) == 0 {
+			r.HTTPRequest.Header.Set("X-Amz-Content-Sha256", "UNSIGNED-PAYLOAD")
+		}
+	}
+}
diff --git a/weed/remote_storage/track_sync_offset.go b/weed/remote_storage/track_sync_offset.go
new file mode 100644
index 000000000..2dfb6d784
--- /dev/null
+++ b/weed/remote_storage/track_sync_offset.go
@@ -0,0 +1,73 @@
+package remote_storage
+
+import (
+	"context"
+	"errors"
+	"github.com/chrislusf/seaweedfs/weed/pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/util"
+	"google.golang.org/grpc"
+)
+
+const (
+	SyncKeyPrefix = "remote.sync."
+)
+
+func GetSyncOffset(grpcDialOption grpc.DialOption, filer string, dir string) (lastOffsetTsNs int64, readErr error) {
+
+	dirHash := uint32(util.HashStringToLong(dir))
+
+	readErr = pb.WithFilerClient(filer, grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
+		syncKey := []byte(SyncKeyPrefix + "____")
+		util.Uint32toBytes(syncKey[len(SyncKeyPrefix):len(SyncKeyPrefix)+4], dirHash)
+
+		resp, err := client.KvGet(context.Background(), &filer_pb.KvGetRequest{Key: syncKey})
+		if err != nil {
+			return err
+		}
+
+		if len(resp.Error) != 0 {
+			return errors.New(resp.Error)
+		}
+		if len(resp.Value) < 8 {
+			return nil
+		}
+
+		lastOffsetTsNs = int64(util.BytesToUint64(resp.Value))
+
+		return nil
+	})
+
+	return
+
+}
+
+func SetSyncOffset(grpcDialOption grpc.DialOption, filer string, dir string, offsetTsNs int64) error {
+
+	dirHash := uint32(util.HashStringToLong(dir))
+
+	return pb.WithFilerClient(filer, grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
+
+		syncKey := []byte(SyncKeyPrefix + "____")
+		util.Uint32toBytes(syncKey[len(SyncKeyPrefix):len(SyncKeyPrefix)+4], dirHash)
+
+		valueBuf := make([]byte, 8)
+		util.Uint64toBytes(valueBuf, uint64(offsetTsNs))
+
+		resp, err := client.KvPut(context.Background(), &filer_pb.KvPutRequest{
+			Key:   syncKey,
+			Value: valueBuf,
+		})
+		if err != nil {
+			return err
+		}
+
+		if len(resp.Error) != 0 {
+			return errors.New(resp.Error)
+		}
+
+		return nil
+
+	})
+
+}
diff --git a/weed/remote_storage/traverse_bfs.go b/weed/remote_storage/traverse_bfs.go
new file mode 100644
index 000000000..a73a1d5fd
--- /dev/null
+++ b/weed/remote_storage/traverse_bfs.go
@@ -0,0 +1,62 @@
+package remote_storage
+
+import (
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/util"
+	"sync"
+	"time"
+)
+
+type ListDirectoryFunc func(parentDir util.FullPath, visitFn VisitFunc) error
+
+func TraverseBfs(listDirFn ListDirectoryFunc, parentPath util.FullPath, visitFn VisitFunc) (err error) {
+	K := 5
+
+	var dirQueueWg sync.WaitGroup
+	dirQueue := util.NewQueue()
+	dirQueueWg.Add(1)
+	dirQueue.Enqueue(parentPath)
+	var isTerminating bool
+
+	for i := 0; i < K; i++ {
+		go func() {
+			for {
+				if isTerminating {
+					break
+				}
+				t := dirQueue.Dequeue()
+				if t == nil {
+					time.Sleep(329 * time.Millisecond)
+					continue
+				}
+				dir := t.(util.FullPath)
+				processErr := processOneDirectory(listDirFn, dir, visitFn, dirQueue, &dirQueueWg)
+				if processErr != nil {
+					err = processErr
+				}
+				dirQueueWg.Done()
+			}
+		}()
+	}
+
+	dirQueueWg.Wait()
+	isTerminating = true
+	return
+
+}
+
+func processOneDirectory(listDirFn ListDirectoryFunc, parentPath util.FullPath, visitFn VisitFunc, dirQueue *util.Queue, dirQueueWg *sync.WaitGroup) error {
+
+	return listDirFn(parentPath, func(dir string, name string, isDirectory bool, remoteEntry *filer_pb.RemoteEntry) error {
+		if err := visitFn(dir, name, isDirectory, remoteEntry); err != nil {
+			return err
+		}
+		if !isDirectory {
+			return nil
+		}
+		dirQueueWg.Add(1)
+		dirQueue.Enqueue(parentPath.Child(name))
+		return nil
+	})
+
+}
diff --git a/weed/replication/sink/azuresink/azure_sink.go b/weed/replication/sink/azuresink/azure_sink.go
index 0ac32b5c1..3b944e5b7 100644
--- a/weed/replication/sink/azuresink/azure_sink.go
+++ b/weed/replication/sink/azuresink/azure_sink.go
@@ -62,7 +62,7 @@ func (g *AzureSink) initialize(accountName, accountKey, container, dir string) e
 	// Use your Storage account's name and key to create a credential object.
 	credential, err := azblob.NewSharedKeyCredential(accountName, accountKey)
 	if err != nil {
-		glog.Fatalf("failed to create Azure credential with account name:%s key:%s", accountName, accountKey)
+		glog.Fatalf("failed to create Azure credential with account name:%s: %v", accountName, err)
 	}
 
 	// Create a request pipeline that is used to process HTTP(S) requests and responses.
@@ -109,13 +109,13 @@ func (g *AzureSink) CreateEntry(key string, entry *filer_pb.Entry, signatures []
 	// Azure Storage account's container.
 	appendBlobURL := g.containerURL.NewAppendBlobURL(key)
 
-	_, err := appendBlobURL.Create(context.Background(), azblob.BlobHTTPHeaders{}, azblob.Metadata{}, azblob.BlobAccessConditions{})
+	_, err := appendBlobURL.Create(context.Background(), azblob.BlobHTTPHeaders{}, azblob.Metadata{}, azblob.BlobAccessConditions{}, azblob.BlobTagsMap{}, azblob.ClientProvidedKeyOptions{})
 	if err != nil {
 		return err
 	}
 
 	writeFunc := func(data []byte) error {
-		_, writeErr := appendBlobURL.AppendBlock(context.Background(), bytes.NewReader(data), azblob.AppendBlobAccessConditions{}, nil)
+		_, writeErr := appendBlobURL.AppendBlock(context.Background(), bytes.NewReader(data), azblob.AppendBlobAccessConditions{}, nil, azblob.ClientProvidedKeyOptions{})
 		return writeErr
 	}
 
diff --git a/weed/replication/sink/filersink/fetch_write.go b/weed/replication/sink/filersink/fetch_write.go
index b5ea3e2cb..e253eb96c 100644
--- a/weed/replication/sink/filersink/fetch_write.go
+++ b/weed/replication/sink/filersink/fetch_write.go
@@ -107,7 +107,16 @@ func (fs *FilerSink) fetchAndWrite(sourceChunk *filer_pb.FileChunk, path string)
 	glog.V(4).Infof("replicating %s to %s header:%+v", filename, fileUrl, header)
 
 	// fetch data as is, regardless whether it is encrypted or not
-	uploadResult, err, _ := operation.Upload(fileUrl, filename, false, resp.Body, "gzip" == header.Get("Content-Encoding"), header.Get("Content-Type"), nil, auth)
+	uploadOption := &operation.UploadOption{
+		UploadUrl:         fileUrl,
+		Filename:          filename,
+		Cipher:            false,
+		IsInputCompressed: "gzip" == header.Get("Content-Encoding"),
+		MimeType:          header.Get("Content-Type"),
+		PairMap:           nil,
+		Jwt:               auth,
+	}
+	uploadResult, err, _ := operation.Upload(resp.Body, uploadOption)
 	if err != nil {
 		glog.V(0).Infof("upload source data %v to %s: %v", sourceChunk.GetFileIdString(), fileUrl, err)
 		return "", fmt.Errorf("upload data: %v", err)
diff --git a/weed/replication/sink/s3sink/s3_sink.go b/weed/replication/sink/s3sink/s3_sink.go
index 6fbef31e9..c3da1ee3f 100644
--- a/weed/replication/sink/s3sink/s3_sink.go
+++ b/weed/replication/sink/s3sink/s3_sink.go
@@ -74,9 +74,10 @@ func (s3sink *S3Sink) initialize(awsAccessKeyId, awsSecretAccessKey, region, buc
 	s3sink.endpoint = endpoint
 
 	config := &aws.Config{
-		Region:           aws.String(s3sink.region),
-		Endpoint:         aws.String(s3sink.endpoint),
-		S3ForcePathStyle: aws.Bool(true),
+		Region:                        aws.String(s3sink.region),
+		Endpoint:                      aws.String(s3sink.endpoint),
+		S3ForcePathStyle:              aws.Bool(true),
+		S3DisableContentMD5Validation: aws.Bool(true),
 	}
 	if awsAccessKeyId != "" && awsSecretAccessKey != "" {
 		config.Credentials = credentials.NewStaticCredentials(awsAccessKeyId, awsSecretAccessKey, "")
diff --git a/weed/replication/sub/notification_aws_sqs.go b/weed/replication/sub/notification_aws_sqs.go
index 642834c72..08133533f 100644
--- a/weed/replication/sub/notification_aws_sqs.go
+++ b/weed/replication/sub/notification_aws_sqs.go
@@ -41,7 +41,8 @@ func (k *AwsSqsInput) Initialize(configuration util.Configuration, prefix string
 func (k *AwsSqsInput) initialize(awsAccessKeyId, awsSecretAccessKey, region, queueName string) (err error) {
 
 	config := &aws.Config{
-		Region: aws.String(region),
+		Region:                        aws.String(region),
+		S3DisableContentMD5Validation: aws.Bool(true),
 	}
 	if awsAccessKeyId != "" && awsSecretAccessKey != "" {
 		config.Credentials = credentials.NewStaticCredentials(awsAccessKeyId, awsSecretAccessKey, "")
diff --git a/weed/s3api/s3api_object_copy_handlers.go b/weed/s3api/s3api_object_copy_handlers.go
index 60dd54152..3cda1da53 100644
--- a/weed/s3api/s3api_object_copy_handlers.go
+++ b/weed/s3api/s3api_object_copy_handlers.go
@@ -33,11 +33,13 @@ func (s3a *S3ApiServer) CopyObjectHandler(w http.ResponseWriter, r *http.Request
 		entry, err := s3a.getEntry(dir, name)
 		if err != nil {
 			s3err.WriteErrorResponse(w, s3err.ErrInvalidCopySource, r)
+			return
 		}
 		entry.Extended = weed_server.SaveAmzMetaData(r, entry.Extended, isReplace(r))
 		err = s3a.touch(dir, name, entry)
 		if err != nil {
 			s3err.WriteErrorResponse(w, s3err.ErrInvalidCopySource, r)
+			return
 		}
 		writeSuccessResponseXML(w, CopyObjectResult{
 			ETag:         fmt.Sprintf("%x", entry.Attributes.Md5),
@@ -51,6 +53,13 @@ func (s3a *S3ApiServer) CopyObjectHandler(w http.ResponseWriter, r *http.Request
 		s3err.WriteErrorResponse(w, s3err.ErrInvalidCopySource, r)
 		return
 	}
+	srcPath := util.FullPath(fmt.Sprintf("%s/%s%s", s3a.option.BucketsPath, srcBucket, srcObject))
+	dir, name := srcPath.DirAndName()
+	_, err = s3a.getEntry(dir, name)
+	if err != nil {
+		s3err.WriteErrorResponse(w, s3err.ErrInvalidCopySource, r)
+		return
+	}
 
 	if srcBucket == dstBucket && srcObject == dstObject {
 		s3err.WriteErrorResponse(w, s3err.ErrInvalidCopyDest, r)
diff --git a/weed/sequence/etcd_sequencer.go b/weed/sequence/etcd_sequencer.go
index 1fc378640..a9f2bb97f 100644
--- a/weed/sequence/etcd_sequencer.go
+++ b/weed/sequence/etcd_sequencer.go
@@ -10,6 +10,7 @@ Note :
 import (
 	"context"
 	"fmt"
+	"go.etcd.io/etcd/client"
 	"sync"
 	"time"
 
@@ -19,7 +20,6 @@ import (
 	"strings"
 
 	"github.com/chrislusf/seaweedfs/weed/glog"
-	"go.etcd.io/etcd/client"
 )
 
 const (
diff --git a/weed/server/common.go b/weed/server/common.go
index 2cd2276eb..2054e1a84 100644
--- a/weed/server/common.go
+++ b/weed/server/common.go
@@ -33,7 +33,24 @@ func init() {
 	go serverStats.Start()
 }
 
+// bodyAllowedForStatus is a copy of http.bodyAllowedForStatus non-exported function.
+func bodyAllowedForStatus(status int) bool {
+	switch {
+	case status >= 100 && status <= 199:
+		return false
+	case status == http.StatusNoContent:
+		return false
+	case status == http.StatusNotModified:
+		return false
+	}
+	return true
+}
+
 func writeJson(w http.ResponseWriter, r *http.Request, httpStatus int, obj interface{}) (err error) {
+	if !bodyAllowedForStatus(httpStatus) {
+		return
+	}
+
 	var bytes []byte
 	if obj != nil {
 		if r.FormValue("pretty") != "" {
@@ -144,7 +161,16 @@ func submitForClientHandler(w http.ResponseWriter, r *http.Request, masterFn ope
 	}
 
 	debug("upload file to store", url)
-	uploadResult, err := operation.UploadData(url, pu.FileName, false, pu.Data, pu.IsGzipped, pu.MimeType, pu.PairMap, assignResult.Auth)
+	uploadOption := &operation.UploadOption{
+		UploadUrl:         url,
+		Filename:          pu.FileName,
+		Cipher:            false,
+		IsInputCompressed: pu.IsGzipped,
+		MimeType:          pu.MimeType,
+		PairMap:           pu.PairMap,
+		Jwt:               assignResult.Auth,
+	}
+	uploadResult, err := operation.UploadData(pu.Data, uploadOption)
 	if err != nil {
 		writeJsonError(w, r, http.StatusInternalServerError, err)
 		return
diff --git a/weed/server/filer_grpc_server.go b/weed/server/filer_grpc_server.go
index 08b01dd09..6a7df0f87 100644
--- a/weed/server/filer_grpc_server.go
+++ b/weed/server/filer_grpc_server.go
@@ -384,6 +384,8 @@ func (fs *FilerServer) Statistics(ctx context.Context, req *filer_pb.StatisticsR
 
 func (fs *FilerServer) GetFilerConfiguration(ctx context.Context, req *filer_pb.GetFilerConfigurationRequest) (resp *filer_pb.GetFilerConfigurationResponse, err error) {
 
+	clusterId, _ := fs.filer.Store.KvGet(context.Background(), []byte("clusterId"))
+
 	t := &filer_pb.GetFilerConfigurationResponse{
 		Masters:            fs.option.Masters,
 		Collection:         fs.option.Collection,
@@ -395,6 +397,7 @@ func (fs *FilerServer) GetFilerConfiguration(ctx context.Context, req *filer_pb.
 		MetricsAddress:     fs.metricsAddress,
 		MetricsIntervalSec: int32(fs.metricsIntervalSec),
 		Version:            util.Version(),
+		ClusterId:          string(clusterId),
 	}
 
 	glog.V(4).Infof("GetFilerConfiguration: %v", t)
@@ -409,7 +412,7 @@ func (fs *FilerServer) KeepConnected(stream filer_pb.SeaweedFiler_KeepConnectedS
 		return err
 	}
 
-	clientName := fmt.Sprintf("%s:%d", req.Name, req.GrpcPort)
+	clientName := util.JoinHostPort(req.Name, int(req.GrpcPort))
 	m := make(map[string]bool)
 	for _, tp := range req.Resources {
 		m[tp] = true
diff --git a/weed/server/filer_grpc_server_remote.go b/weed/server/filer_grpc_server_remote.go
index 6d77e310a..c47356a8e 100644
--- a/weed/server/filer_grpc_server_remote.go
+++ b/weed/server/filer_grpc_server_remote.go
@@ -6,11 +6,13 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/filer"
 	"github.com/chrislusf/seaweedfs/weed/operation"
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/remote_pb"
 	"github.com/chrislusf/seaweedfs/weed/pb/volume_server_pb"
 	"github.com/chrislusf/seaweedfs/weed/storage/needle"
 	"github.com/chrislusf/seaweedfs/weed/util"
 	"github.com/golang/protobuf/proto"
 	"strings"
+	"sync"
 	"time"
 )
 
@@ -27,7 +29,7 @@ func (fs *FilerServer) DownloadToLocal(ctx context.Context, req *filer_pb.Downlo
 	}
 
 	// find mapping
-	var remoteStorageMountedLocation *filer_pb.RemoteStorageLocation
+	var remoteStorageMountedLocation *remote_pb.RemoteStorageLocation
 	var localMountedDir string
 	for k, loc := range mappings.Mappings {
 		if strings.HasPrefix(req.Directory, k) {
@@ -43,7 +45,7 @@ func (fs *FilerServer) DownloadToLocal(ctx context.Context, req *filer_pb.Downlo
 	if err != nil {
 		return nil, err
 	}
-	storageConf := &filer_pb.RemoteConf{}
+	storageConf := &remote_pb.RemoteConf{}
 	if unMarshalErr := proto.Unmarshal(storageConfEntry.Content, storageConf); unMarshalErr != nil {
 		return nil, fmt.Errorf("unmarshal remote storage conf %s/%s: %v", filer.DirectoryEtcRemote, remoteStorageMountedLocation.Name+filer.REMOTE_STORAGE_CONF_SUFFIX, unMarshalErr)
 	}
@@ -60,8 +62,7 @@ func (fs *FilerServer) DownloadToLocal(ctx context.Context, req *filer_pb.Downlo
 	}
 
 	// detect storage option
-	// replication level is set to "000" to ensure only need to ask one volume server to fetch the data.
-	so, err := fs.detectStorageOption(req.Directory, "", "000", 0, "", "", "")
+	so, err := fs.detectStorageOption(req.Directory, "", "", 0, "", "", "")
 	if err != nil {
 		return resp, err
 	}
@@ -79,12 +80,15 @@ func (fs *FilerServer) DownloadToLocal(ctx context.Context, req *filer_pb.Downlo
 
 	var chunks []*filer_pb.FileChunk
 	var fetchAndWriteErr error
+	var wg sync.WaitGroup
 
 	limitedConcurrentExecutor := util.NewLimitedConcurrentExecutor(8)
 	for offset := int64(0); offset < entry.Remote.RemoteSize; offset += chunkSize {
 		localOffset := offset
 
+		wg.Add(1)
 		limitedConcurrentExecutor.Execute(func() {
+			defer wg.Done()
 			size := chunkSize
 			if localOffset+chunkSize > entry.Remote.RemoteSize {
 				size = entry.Remote.RemoteSize - localOffset
@@ -106,22 +110,30 @@ func (fs *FilerServer) DownloadToLocal(ctx context.Context, req *filer_pb.Downlo
 				return
 			}
 
+			var replicas []*volume_server_pb.FetchAndWriteNeedleRequest_Replica
+			for _, r := range assignResult.Replicas {
+				replicas = append(replicas, &volume_server_pb.FetchAndWriteNeedleRequest_Replica{
+					Url:       r.Url,
+					PublicUrl: r.PublicUrl,
+				})
+			}
+
 			// tell filer to tell volume server to download into needles
 			err = operation.WithVolumeServerClient(assignResult.Url, fs.grpcDialOption, func(volumeServerClient volume_server_pb.VolumeServerClient) error {
 				_, fetchAndWriteErr := volumeServerClient.FetchAndWriteNeedle(context.Background(), &volume_server_pb.FetchAndWriteNeedleRequest{
-					VolumeId:     uint32(fileId.VolumeId),
-					NeedleId:     uint64(fileId.Key),
-					Cookie:       uint32(fileId.Cookie),
-					Offset:       localOffset,
-					Size:         size,
-					RemoteType:   storageConf.Type,
-					RemoteName:   storageConf.Name,
-					S3AccessKey:  storageConf.S3AccessKey,
-					S3SecretKey:  storageConf.S3SecretKey,
-					S3Region:     storageConf.S3Region,
-					S3Endpoint:   storageConf.S3Endpoint,
-					RemoteBucket: remoteStorageMountedLocation.Bucket,
-					RemotePath:   string(dest),
+					VolumeId:   uint32(fileId.VolumeId),
+					NeedleId:   uint64(fileId.Key),
+					Cookie:     uint32(fileId.Cookie),
+					Offset:     localOffset,
+					Size:       size,
+					Replicas:   replicas,
+					Auth:       string(assignResult.Auth),
+					RemoteConf: storageConf,
+					RemoteLocation: &remote_pb.RemoteStorageLocation{
+						Name:   remoteStorageMountedLocation.Name,
+						Bucket: remoteStorageMountedLocation.Bucket,
+						Path:   string(dest),
+					},
 				})
 				if fetchAndWriteErr != nil {
 					return fmt.Errorf("volume server %s fetchAndWrite %s: %v", assignResult.Url, dest, fetchAndWriteErr)
@@ -129,7 +141,7 @@ func (fs *FilerServer) DownloadToLocal(ctx context.Context, req *filer_pb.Downlo
 				return nil
 			})
 
-			if err != nil {
+			if err != nil && fetchAndWriteErr == nil {
 				fetchAndWriteErr = err
 				return
 			}
@@ -148,6 +160,11 @@ func (fs *FilerServer) DownloadToLocal(ctx context.Context, req *filer_pb.Downlo
 		})
 	}
 
+	wg.Wait()
+	if fetchAndWriteErr != nil {
+		return nil, fetchAndWriteErr
+	}
+
 	garbage := entry.Chunks
 
 	newEntry := entry.ShallowClone()
diff --git a/weed/server/filer_grpc_server_sub_meta.go b/weed/server/filer_grpc_server_sub_meta.go
index 3fdac1b26..a900275b9 100644
--- a/weed/server/filer_grpc_server_sub_meta.go
+++ b/weed/server/filer_grpc_server_sub_meta.go
@@ -201,14 +201,18 @@ func (fs *FilerServer) eachEventNotificationFn(req *filer_pb.SubscribeMetadataRe
 			return nil
 		}
 
-		if !strings.HasPrefix(fullpath, req.PathPrefix) {
-			if eventNotification.NewParentPath != "" {
-				newFullPath := util.Join(eventNotification.NewParentPath, entryName)
-				if !strings.HasPrefix(newFullPath, req.PathPrefix) {
+		if hasPrefixIn(fullpath, req.PathPrefixes) {
+			// good
+		} else {
+			if !strings.HasPrefix(fullpath, req.PathPrefix) {
+				if eventNotification.NewParentPath != "" {
+					newFullPath := util.Join(eventNotification.NewParentPath, entryName)
+					if !strings.HasPrefix(newFullPath, req.PathPrefix) {
+						return nil
+					}
+				} else {
 					return nil
 				}
-			} else {
-				return nil
 			}
 		}
 
@@ -227,6 +231,15 @@ func (fs *FilerServer) eachEventNotificationFn(req *filer_pb.SubscribeMetadataRe
 	}
 }
 
+func hasPrefixIn(text string, prefixes []string) bool {
+	for _, p := range prefixes {
+		if strings.HasPrefix(text, p) {
+			return true
+		}
+	}
+	return false
+}
+
 func (fs *FilerServer) addClient(clientType string, clientAddress string) (clientName string) {
 	clientName = clientType + "@" + clientAddress
 	glog.V(0).Infof("+ listener %v", clientName)
diff --git a/weed/server/filer_server.go b/weed/server/filer_server.go
index 534bc4840..7e5e98660 100644
--- a/weed/server/filer_server.go
+++ b/weed/server/filer_server.go
@@ -143,7 +143,7 @@ func NewFilerServer(defaultMux, readonlyMux *http.ServeMux, option *FilerOption)
 		readonlyMux.HandleFunc("/", fs.readonlyFilerHandler)
 	}
 
-	fs.filer.AggregateFromPeers(fmt.Sprintf("%s:%d", option.Host, option.Port), option.Filers)
+	fs.filer.AggregateFromPeers(util.JoinHostPort(option.Host, int(option.Port)), option.Filers)
 
 	fs.filer.LoadBuckets()
 
diff --git a/weed/server/filer_server_handlers_read.go b/weed/server/filer_server_handlers_read.go
index fc9cacf39..054a1bd00 100644
--- a/weed/server/filer_server_handlers_read.go
+++ b/weed/server/filer_server_handlers_read.go
@@ -142,6 +142,9 @@ func (fs *FilerServer) GetOrHeadHandler(w http.ResponseWriter, r *http.Request)
 
 	if rangeReq := r.Header.Get("Range"); rangeReq == "" {
 		ext := filepath.Ext(filename)
+		if len(ext) > 0 {
+			ext = strings.ToLower(ext)
+		}
 		width, height, mode, shouldResize := shouldResizeImages(ext, r)
 		if shouldResize {
 			data, err := filer.ReadAll(fs.filer.MasterClient, entry.Chunks)
diff --git a/weed/server/filer_server_handlers_read_dir.go b/weed/server/filer_server_handlers_read_dir.go
index 307c411b6..f67e90d38 100644
--- a/weed/server/filer_server_handlers_read_dir.go
+++ b/weed/server/filer_server_handlers_read_dir.go
@@ -2,9 +2,6 @@ package weed_server
 
 import (
 	"context"
-	"encoding/base64"
-	"fmt"
-	"github.com/skip2/go-qrcode"
 	"net/http"
 	"strconv"
 	"strings"
@@ -72,12 +69,6 @@ func (fs *FilerServer) listDirectoryHandler(w http.ResponseWriter, r *http.Reque
 		return
 	}
 
-	var qrImageString string
-	img, err := qrcode.Encode(fmt.Sprintf("http://%s:%d%s", fs.option.Host, fs.option.Port, r.URL.Path), qrcode.Medium, 128)
-	if err == nil {
-		qrImageString = base64.StdEncoding.EncodeToString(img)
-	}
-
 	ui.StatusTpl.Execute(w, struct {
 		Path                  string
 		Breadcrumbs           []ui.Breadcrumb
@@ -85,7 +76,6 @@ func (fs *FilerServer) listDirectoryHandler(w http.ResponseWriter, r *http.Reque
 		Limit                 int
 		LastFileName          string
 		ShouldDisplayLoadMore bool
-		QrImage               string
 	}{
 		path,
 		ui.ToBreadcrumb(path),
@@ -93,6 +83,5 @@ func (fs *FilerServer) listDirectoryHandler(w http.ResponseWriter, r *http.Reque
 		limit,
 		lastFileName,
 		shouldDisplayLoadMore,
-		qrImageString,
 	})
 }
diff --git a/weed/server/filer_server_handlers_write_autochunk.go b/weed/server/filer_server_handlers_write_autochunk.go
index a42e0fc97..6323d1589 100644
--- a/weed/server/filer_server_handlers_write_autochunk.go
+++ b/weed/server/filer_server_handlers_write_autochunk.go
@@ -241,7 +241,16 @@ func (fs *FilerServer) saveAsChunk(so *operation.StorageOption) filer.SaveDataAs
 		}
 
 		// upload the chunk to the volume server
-		uploadResult, uploadErr, _ := operation.Upload(urlLocation, name, fs.option.Cipher, reader, false, "", nil, auth)
+		uploadOption := &operation.UploadOption{
+			UploadUrl:         urlLocation,
+			Filename:          name,
+			Cipher:            fs.option.Cipher,
+			IsInputCompressed: false,
+			MimeType:          "",
+			PairMap:           nil,
+			Jwt:               auth,
+		}
+		uploadResult, uploadErr, _ := operation.Upload(reader, uploadOption)
 		if uploadErr != nil {
 			return nil, "", "", uploadErr
 		}
diff --git a/weed/server/filer_server_handlers_write_cipher.go b/weed/server/filer_server_handlers_write_cipher.go
index acaa8f5ab..14fa10e2c 100644
--- a/weed/server/filer_server_handlers_write_cipher.go
+++ b/weed/server/filer_server_handlers_write_cipher.go
@@ -44,7 +44,16 @@ func (fs *FilerServer) encrypt(ctx context.Context, w http.ResponseWriter, r *ht
 		// println("detect2 mimetype to", pu.MimeType)
 	}
 
-	uploadResult, uploadError := operation.UploadData(urlLocation, pu.FileName, true, uncompressedData, false, pu.MimeType, pu.PairMap, auth)
+	uploadOption := &operation.UploadOption{
+		UploadUrl:         urlLocation,
+		Filename:          pu.FileName,
+		Cipher:            true,
+		IsInputCompressed: false,
+		MimeType:          pu.MimeType,
+		PairMap:           pu.PairMap,
+		Jwt:               auth,
+	}
+	uploadResult, uploadError := operation.UploadData(uncompressedData, uploadOption)
 	if uploadError != nil {
 		return nil, fmt.Errorf("upload to volume server: %v", uploadError)
 	}
diff --git a/weed/server/filer_server_handlers_write_upload.go b/weed/server/filer_server_handlers_write_upload.go
index 2275ff1bc..196d7638e 100644
--- a/weed/server/filer_server_handlers_write_upload.go
+++ b/weed/server/filer_server_handlers_write_upload.go
@@ -127,7 +127,16 @@ func (fs *FilerServer) doUpload(urlLocation string, limitedReader io.Reader, fil
 		stats.FilerRequestHistogram.WithLabelValues("chunkUpload").Observe(time.Since(start).Seconds())
 	}()
 
-	uploadResult, err, data := operation.Upload(urlLocation, fileName, fs.option.Cipher, limitedReader, false, contentType, pairMap, auth)
+	uploadOption := &operation.UploadOption{
+		UploadUrl:         urlLocation,
+		Filename:          fileName,
+		Cipher:            fs.option.Cipher,
+		IsInputCompressed: false,
+		MimeType:          contentType,
+		PairMap:           pairMap,
+		Jwt:               auth,
+	}
+	uploadResult, err, data := operation.Upload(limitedReader, uploadOption)
 	if uploadResult != nil && uploadResult.RetryCount > 0 {
 		stats.FilerRequestCounter.WithLabelValues("chunkUploadRetry").Add(float64(uploadResult.RetryCount))
 	}
diff --git a/weed/server/filer_server_rocksdb.go b/weed/server/filer_server_rocksdb.go
index 5fcc7e88f..75965e761 100644
--- a/weed/server/filer_server_rocksdb.go
+++ b/weed/server/filer_server_rocksdb.go
@@ -1,3 +1,4 @@
+//go:build rocksdb
 // +build rocksdb
 
 package weed_server
diff --git a/weed/server/filer_ui/filer.html b/weed/server/filer_ui/filer.html
index 84dc4d4d6..6f57c25d8 100644
--- a/weed/server/filer_ui/filer.html
+++ b/weed/server/filer_ui/filer.html
@@ -36,11 +36,6 @@
             display: none;
         }
 
-        .qrImage {
-            display: block;
-            margin-left: auto;
-            margin-right: auto;
-        }
     </style>
 </head>
 <body>
@@ -115,10 +110,6 @@
     <br/>
     <br/>
 
-    <div class="navbar navbar-fixed-bottom">
-        <img src="data:image/png;base64,{{.QrImage}}" class="qrImage"/>
-    </div>
-
 </div>
 </body>
 <script type="text/javascript">
diff --git a/weed/server/master_grpc_server.go b/weed/server/master_grpc_server.go
index afd479b21..94e050259 100644
--- a/weed/server/master_grpc_server.go
+++ b/weed/server/master_grpc_server.go
@@ -2,8 +2,8 @@ package weed_server
 
 import (
 	"context"
-	"fmt"
 	"github.com/chrislusf/seaweedfs/weed/storage/backend"
+	"github.com/chrislusf/seaweedfs/weed/util"
 	"net"
 	"strings"
 	"time"
@@ -22,7 +22,11 @@ func (ms *MasterServer) SendHeartbeat(stream master_pb.Seaweed_SendHeartbeatServ
 
 	defer func() {
 		if dn != nil {
-
+			dn.Counter--
+			if dn.Counter >  0 {
+				glog.V(0).Infof("disconnect phantom volume server %s:%d remaining %d", dn.Ip, dn.Port, dn.Counter)
+				return
+			}
 			// if the volume server disconnects and reconnects quickly
 			//  the unregister and register can race with each other
 			ms.Topo.UnRegisterDataNode(dn)
@@ -46,7 +50,6 @@ func (ms *MasterServer) SendHeartbeat(stream master_pb.Seaweed_SendHeartbeatServ
 				}
 				ms.clientChansLock.RUnlock()
 			}
-
 		}
 	}()
 
@@ -68,13 +71,14 @@ func (ms *MasterServer) SendHeartbeat(stream master_pb.Seaweed_SendHeartbeatServ
 			dc := ms.Topo.GetOrCreateDataCenter(dcName)
 			rack := dc.GetOrCreateRack(rackName)
 			dn = rack.GetOrCreateDataNode(heartbeat.Ip, int(heartbeat.Port), heartbeat.PublicUrl, heartbeat.MaxVolumeCounts)
-			glog.V(0).Infof("added volume server %v:%d", heartbeat.GetIp(), heartbeat.GetPort())
+			glog.V(0).Infof("added volume server %d: %v:%d", dn.Counter, heartbeat.GetIp(), heartbeat.GetPort())
 			if err := stream.Send(&master_pb.HeartbeatResponse{
 				VolumeSizeLimit: uint64(ms.option.VolumeSizeLimitMB) * 1024 * 1024,
 			}); err != nil {
 				glog.Warningf("SendHeartbeat.Send volume size to %s:%d %v", dn.Ip, dn.Port, err)
 				return err
 			}
+			dn.Counter++
 		}
 
 		dn.AdjustMaxVolumeCounts(heartbeat.MaxVolumeCounts)
@@ -284,7 +288,7 @@ func findClientAddress(ctx context.Context, grpcPort uint32) string {
 	}
 	if tcpAddr, ok := pr.Addr.(*net.TCPAddr); ok {
 		externalIP := tcpAddr.IP
-		return fmt.Sprintf("%s:%d", externalIP, grpcPort)
+		return util.JoinHostPort(externalIP.String(), int(grpcPort))
 	}
 	return pr.Addr.String()
 
diff --git a/weed/server/master_grpc_server_volume.go b/weed/server/master_grpc_server_volume.go
index 4b975a0c4..3a92889d2 100644
--- a/weed/server/master_grpc_server_volume.go
+++ b/weed/server/master_grpc_server_volume.go
@@ -147,14 +147,23 @@ func (ms *MasterServer) Assign(ctx context.Context, req *master_pb.AssignRequest
 	)
 
 	for time.Now().Sub(startTime) < maxTimeout {
-		fid, count, dn, err := ms.Topo.PickForWrite(req.Count, option)
+		fid, count, dnList, err := ms.Topo.PickForWrite(req.Count, option)
 		if err == nil {
+			dn := dnList.Head()
+			var replicas []*master_pb.AssignResponse_Replica
+			for _, r := range dnList.Rest() {
+				replicas = append(replicas, &master_pb.AssignResponse_Replica{
+					Url:       r.Url(),
+					PublicUrl: r.PublicUrl,
+				})
+			}
 			return &master_pb.AssignResponse{
 				Fid:       fid,
 				Url:       dn.Url(),
 				PublicUrl: dn.PublicUrl,
 				Count:     count,
 				Auth:      string(security.GenJwt(ms.guard.SigningKey, ms.guard.ExpiresAfterSec, fid)),
+				Replicas:  replicas,
 			}, nil
 		}
 		//glog.V(4).Infoln("waiting for volume growing...")
diff --git a/weed/server/master_server.go b/weed/server/master_server.go
index d2edeb6cb..7c78be379 100644
--- a/weed/server/master_server.go
+++ b/weed/server/master_server.go
@@ -224,7 +224,7 @@ func (ms *MasterServer) startAdminScripts() {
 		scriptLines = append(scriptLines, "unlock")
 	}
 
-	masterAddress := fmt.Sprintf("%s:%d", ms.option.Host, ms.option.Port)
+	masterAddress := util.JoinHostPort(ms.option.Host, ms.option.Port)
 
 	var shellOptions shell.ShellOptions
 	shellOptions.GrpcDialOption = security.LoadClientTLS(v, "grpc.master")
@@ -299,7 +299,7 @@ func (ms *MasterServer) createSequencer(option *MasterOption) sequence.Sequencer
 	case "snowflake":
 		var err error
 		snowflakeId := v.GetInt(SequencerSnowflakeId)
-		seq, err = sequence.NewSnowflakeSequencer(fmt.Sprintf("%s:%d", option.Host, option.Port), snowflakeId)
+		seq, err = sequence.NewSnowflakeSequencer(util.JoinHostPort(option.Host, option.Port), snowflakeId)
 		if err != nil {
 			glog.Error(err)
 			seq = nil
diff --git a/weed/server/master_server_handlers.go b/weed/server/master_server_handlers.go
index 2a1f6d523..36c4239fb 100644
--- a/weed/server/master_server_handlers.go
+++ b/weed/server/master_server_handlers.go
@@ -130,9 +130,10 @@ func (ms *MasterServer) dirAssignHandler(w http.ResponseWriter, r *http.Request)
 			return
 		}
 	}
-	fid, count, dn, err := ms.Topo.PickForWrite(requestedCount, option)
+	fid, count, dnList, err := ms.Topo.PickForWrite(requestedCount, option)
 	if err == nil {
 		ms.maybeAddJwtAuthorization(w, fid, true)
+		dn := dnList.Head()
 		writeJsonQuiet(w, r, http.StatusOK, operation.AssignResult{Fid: fid, Url: dn.Url(), PublicUrl: dn.PublicUrl, Count: count})
 	} else {
 		writeJsonQuiet(w, r, http.StatusNotAcceptable, operation.AssignResult{Error: err.Error()})
diff --git a/weed/server/volume_grpc_client_to_master.go b/weed/server/volume_grpc_client_to_master.go
index f8875169f..770abdab7 100644
--- a/weed/server/volume_grpc_client_to_master.go
+++ b/weed/server/volume_grpc_client_to_master.go
@@ -24,8 +24,7 @@ func (vs *VolumeServer) GetMaster() string {
 }
 
 func (vs *VolumeServer) checkWithMaster() (err error) {
-	isConnected := false
-	for !isConnected {
+	for {
 		for _, master := range vs.SeedMasterNodes {
 			err = operation.WithMasterServerClient(master, vs.grpcDialOption, func(masterClient master_pb.SeaweedClient) error {
 				resp, err := masterClient.GetMasterConfiguration(context.Background(), &master_pb.GetMasterConfigurationRequest{})
@@ -44,7 +43,6 @@ func (vs *VolumeServer) checkWithMaster() (err error) {
 		}
 		time.Sleep(1790 * time.Millisecond)
 	}
-	return
 }
 
 func (vs *VolumeServer) heartbeat() {
@@ -128,6 +126,7 @@ func (vs *VolumeServer) doHeartbeat(masterNode, masterGrpcAddress string, grpcDi
 				if vs.store.MaybeAdjustVolumeMax() {
 					if err = stream.Send(vs.store.CollectHeartbeat()); err != nil {
 						glog.V(0).Infof("Volume Server Failed to talk with master %s: %v", vs.currentMaster, err)
+						return
 					}
 				}
 			}
@@ -161,7 +160,7 @@ func (vs *VolumeServer) doHeartbeat(masterNode, masterGrpcAddress string, grpcDi
 					&volumeMessage,
 				},
 			}
-			glog.V(1).Infof("volume server %s:%d adds volume %d", vs.store.Ip, vs.store.Port, volumeMessage.Id)
+			glog.V(0).Infof("volume server %s:%d adds volume %d", vs.store.Ip, vs.store.Port, volumeMessage.Id)
 			if err = stream.Send(deltaBeat); err != nil {
 				glog.V(0).Infof("Volume Server Failed to update to master %s: %v", masterNode, err)
 				return "", err
@@ -172,7 +171,7 @@ func (vs *VolumeServer) doHeartbeat(masterNode, masterGrpcAddress string, grpcDi
 					&ecShardMessage,
 				},
 			}
-			glog.V(1).Infof("volume server %s:%d adds ec shard %d:%d", vs.store.Ip, vs.store.Port, ecShardMessage.Id,
+			glog.V(0).Infof("volume server %s:%d adds ec shard %d:%d", vs.store.Ip, vs.store.Port, ecShardMessage.Id,
 				erasure_coding.ShardBits(ecShardMessage.EcIndexBits).ShardIds())
 			if err = stream.Send(deltaBeat); err != nil {
 				glog.V(0).Infof("Volume Server Failed to update to master %s: %v", masterNode, err)
@@ -184,7 +183,7 @@ func (vs *VolumeServer) doHeartbeat(masterNode, masterGrpcAddress string, grpcDi
 					&volumeMessage,
 				},
 			}
-			glog.V(1).Infof("volume server %s:%d deletes volume %d", vs.store.Ip, vs.store.Port, volumeMessage.Id)
+			glog.V(0).Infof("volume server %s:%d deletes volume %d", vs.store.Ip, vs.store.Port, volumeMessage.Id)
 			if err = stream.Send(deltaBeat); err != nil {
 				glog.V(0).Infof("Volume Server Failed to update to master %s: %v", masterNode, err)
 				return "", err
@@ -195,7 +194,7 @@ func (vs *VolumeServer) doHeartbeat(masterNode, masterGrpcAddress string, grpcDi
 					&ecShardMessage,
 				},
 			}
-			glog.V(1).Infof("volume server %s:%d deletes ec shard %d:%d", vs.store.Ip, vs.store.Port, ecShardMessage.Id,
+			glog.V(0).Infof("volume server %s:%d deletes ec shard %d:%d", vs.store.Ip, vs.store.Port, ecShardMessage.Id,
 				erasure_coding.ShardBits(ecShardMessage.EcIndexBits).ShardIds())
 			if err = stream.Send(deltaBeat); err != nil {
 				glog.V(0).Infof("Volume Server Failed to update to master %s: %v", masterNode, err)
diff --git a/weed/server/volume_grpc_copy.go b/weed/server/volume_grpc_copy.go
index 2ad77a7ff..53ee3df0a 100644
--- a/weed/server/volume_grpc_copy.go
+++ b/weed/server/volume_grpc_copy.go
@@ -79,17 +79,27 @@ func (vs *VolumeServer) VolumeCopy(ctx context.Context, req *volume_server_pb.Vo
 		}()
 
 		// println("source:", volFileInfoResp.String())
-		if err = vs.doCopyFile(client, false, req.Collection, req.VolumeId, volFileInfoResp.CompactionRevision, volFileInfoResp.DatFileSize, dataBaseFileName, ".dat", false, true); err != nil {
+		var modifiedTsNs int64
+		if modifiedTsNs, err = vs.doCopyFile(client, false, req.Collection, req.VolumeId, volFileInfoResp.CompactionRevision, volFileInfoResp.DatFileSize, dataBaseFileName, ".dat", false, true); err != nil {
 			return err
 		}
+		if modifiedTsNs > 0 {
+			os.Chtimes(dataBaseFileName+".dat", time.Unix(0, modifiedTsNs), time.Unix(0, modifiedTsNs))
+		}
 
-		if err = vs.doCopyFile(client, false, req.Collection, req.VolumeId, volFileInfoResp.CompactionRevision, volFileInfoResp.IdxFileSize, indexBaseFileName, ".idx", false, false); err != nil {
+		if modifiedTsNs, err = vs.doCopyFile(client, false, req.Collection, req.VolumeId, volFileInfoResp.CompactionRevision, volFileInfoResp.IdxFileSize, indexBaseFileName, ".idx", false, false); err != nil {
 			return err
 		}
+		if modifiedTsNs > 0 {
+			os.Chtimes(indexBaseFileName+".idx", time.Unix(0, modifiedTsNs), time.Unix(0, modifiedTsNs))
+		}
 
-		if err = vs.doCopyFile(client, false, req.Collection, req.VolumeId, volFileInfoResp.CompactionRevision, volFileInfoResp.DatFileSize, dataBaseFileName, ".vif", false, true); err != nil {
+		if modifiedTsNs, err = vs.doCopyFile(client, false, req.Collection, req.VolumeId, volFileInfoResp.CompactionRevision, volFileInfoResp.DatFileSize, dataBaseFileName, ".vif", false, true); err != nil {
 			return err
 		}
+		if modifiedTsNs > 0 {
+			os.Chtimes(dataBaseFileName+".vif", time.Unix(0, modifiedTsNs), time.Unix(0, modifiedTsNs))
+		}
 
 		os.Remove(dataBaseFileName + ".note")
 
@@ -129,7 +139,7 @@ func (vs *VolumeServer) VolumeCopy(ctx context.Context, req *volume_server_pb.Vo
 	}, err
 }
 
-func (vs *VolumeServer) doCopyFile(client volume_server_pb.VolumeServerClient, isEcVolume bool, collection string, vid, compactRevision uint32, stopOffset uint64, baseFileName, ext string, isAppend, ignoreSourceFileNotFound bool) error {
+func (vs *VolumeServer) doCopyFile(client volume_server_pb.VolumeServerClient, isEcVolume bool, collection string, vid, compactRevision uint32, stopOffset uint64, baseFileName, ext string, isAppend, ignoreSourceFileNotFound bool) (modifiedTsNs int64, err error) {
 
 	copyFileClient, err := client.CopyFile(context.Background(), &volume_server_pb.CopyFileRequest{
 		VolumeId:                 vid,
@@ -141,15 +151,15 @@ func (vs *VolumeServer) doCopyFile(client volume_server_pb.VolumeServerClient, i
 		IgnoreSourceFileNotFound: ignoreSourceFileNotFound,
 	})
 	if err != nil {
-		return fmt.Errorf("failed to start copying volume %d %s file: %v", vid, ext, err)
+		return modifiedTsNs, fmt.Errorf("failed to start copying volume %d %s file: %v", vid, ext, err)
 	}
 
-	err = writeToFile(copyFileClient, baseFileName+ext, util.NewWriteThrottler(vs.compactionBytePerSecond), isAppend)
+	modifiedTsNs, err = writeToFile(copyFileClient, baseFileName+ext, util.NewWriteThrottler(vs.compactionBytePerSecond), isAppend)
 	if err != nil {
-		return fmt.Errorf("failed to copy %s file: %v", baseFileName+ext, err)
+		return modifiedTsNs, fmt.Errorf("failed to copy %s file: %v", baseFileName+ext, err)
 	}
 
-	return nil
+	return modifiedTsNs, nil
 
 }
 
@@ -178,7 +188,7 @@ func checkCopyFiles(originFileInf *volume_server_pb.ReadVolumeFileStatusResponse
 	return nil
 }
 
-func writeToFile(client volume_server_pb.VolumeServer_CopyFileClient, fileName string, wt *util.WriteThrottler, isAppend bool) error {
+func writeToFile(client volume_server_pb.VolumeServer_CopyFileClient, fileName string, wt *util.WriteThrottler, isAppend bool) (modifiedTsNs int64, err error) {
 	glog.V(4).Infof("writing to %s", fileName)
 	flags := os.O_WRONLY | os.O_CREATE | os.O_TRUNC
 	if isAppend {
@@ -186,7 +196,7 @@ func writeToFile(client volume_server_pb.VolumeServer_CopyFileClient, fileName s
 	}
 	dst, err := os.OpenFile(fileName, flags, 0644)
 	if err != nil {
-		return nil
+		return modifiedTsNs, nil
 	}
 	defer dst.Close()
 
@@ -195,13 +205,16 @@ func writeToFile(client volume_server_pb.VolumeServer_CopyFileClient, fileName s
 		if receiveErr == io.EOF {
 			break
 		}
+		if resp.ModifiedTsNs != 0 {
+			modifiedTsNs = resp.ModifiedTsNs
+		}
 		if receiveErr != nil {
-			return fmt.Errorf("receiving %s: %v", fileName, receiveErr)
+			return modifiedTsNs, fmt.Errorf("receiving %s: %v", fileName, receiveErr)
 		}
 		dst.Write(resp.FileContent)
 		wt.MaybeSlowdown(int64(len(resp.FileContent)))
 	}
-	return nil
+	return modifiedTsNs, nil
 }
 
 func (vs *VolumeServer) ReadVolumeFileStatus(ctx context.Context, req *volume_server_pb.ReadVolumeFileStatusRequest) (*volume_server_pb.ReadVolumeFileStatusResponse, error) {
@@ -271,6 +284,12 @@ func (vs *VolumeServer) CopyFile(req *volume_server_pb.CopyFileRequest, stream v
 	}
 	defer file.Close()
 
+	fileInfo, err := file.Stat()
+	if err != nil {
+		return err
+	}
+	fileModTsNs := fileInfo.ModTime().UnixNano()
+
 	buffer := make([]byte, BufferSizeLimit)
 
 	for bytesToRead > 0 {
@@ -290,12 +309,14 @@ func (vs *VolumeServer) CopyFile(req *volume_server_pb.CopyFileRequest, stream v
 			bytesread = int(bytesToRead)
 		}
 		err = stream.Send(&volume_server_pb.CopyFileResponse{
-			FileContent: buffer[:bytesread],
+			FileContent:  buffer[:bytesread],
+			ModifiedTsNs: fileModTsNs,
 		})
 		if err != nil {
 			// println("sending", bytesread, "bytes err", err.Error())
 			return err
 		}
+		fileModTsNs = 0 // only send once
 
 		bytesToRead -= int64(bytesread)
 
diff --git a/weed/server/volume_grpc_erasure_coding.go b/weed/server/volume_grpc_erasure_coding.go
index 452c2766e..364045d9b 100644
--- a/weed/server/volume_grpc_erasure_coding.go
+++ b/weed/server/volume_grpc_erasure_coding.go
@@ -3,6 +3,7 @@ package weed_server
 import (
 	"context"
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/storage/volume_info"
 	"io"
 	"io/ioutil"
 	"math"
@@ -12,7 +13,6 @@ import (
 
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/operation"
-	"github.com/chrislusf/seaweedfs/weed/pb"
 	"github.com/chrislusf/seaweedfs/weed/pb/volume_server_pb"
 	"github.com/chrislusf/seaweedfs/weed/storage"
 	"github.com/chrislusf/seaweedfs/weed/storage/erasure_coding"
@@ -49,6 +49,17 @@ func (vs *VolumeServer) VolumeEcShardsGenerate(ctx context.Context, req *volume_
 		return nil, fmt.Errorf("existing collection:%v unexpected input: %v", v.Collection, req.Collection)
 	}
 
+	shouldCleanup := true
+	defer func() {
+		if !shouldCleanup {
+			return
+		}
+		for i := 0; i < erasure_coding.TotalShardsCount; i++ {
+			os.Remove(fmt.Sprintf("%s.ec%2d", baseFileName, i))
+		}
+		os.Remove(v.IndexFileName() + ".ecx")
+	}()
+
 	// write .ec00 ~ .ec13 files
 	if err := erasure_coding.WriteEcFiles(baseFileName); err != nil {
 		return nil, fmt.Errorf("WriteEcFiles %s: %v", baseFileName, err)
@@ -60,10 +71,12 @@ func (vs *VolumeServer) VolumeEcShardsGenerate(ctx context.Context, req *volume_
 	}
 
 	// write .vif files
-	if err := pb.SaveVolumeInfo(baseFileName+".vif", &volume_server_pb.VolumeInfo{Version: uint32(v.Version())}); err != nil {
+	if err := volume_info.SaveVolumeInfo(baseFileName+".vif", &volume_server_pb.VolumeInfo{Version: uint32(v.Version())}); err != nil {
 		return nil, fmt.Errorf("WriteEcFiles %s: %v", baseFileName, err)
 	}
 
+	shouldCleanup = false
+
 	return &volume_server_pb.VolumeEcShardsGenerateResponse{}, nil
 }
 
@@ -117,7 +130,7 @@ func (vs *VolumeServer) VolumeEcShardsCopy(ctx context.Context, req *volume_serv
 
 		// copy ec data slices
 		for _, shardId := range req.ShardIds {
-			if err := vs.doCopyFile(client, true, req.Collection, req.VolumeId, math.MaxUint32, math.MaxInt64, dataBaseFileName, erasure_coding.ToExt(int(shardId)), false, false); err != nil {
+			if _, err := vs.doCopyFile(client, true, req.Collection, req.VolumeId, math.MaxUint32, math.MaxInt64, dataBaseFileName, erasure_coding.ToExt(int(shardId)), false, false); err != nil {
 				return err
 			}
 		}
@@ -125,7 +138,7 @@ func (vs *VolumeServer) VolumeEcShardsCopy(ctx context.Context, req *volume_serv
 		if req.CopyEcxFile {
 
 			// copy ecx file
-			if err := vs.doCopyFile(client, true, req.Collection, req.VolumeId, math.MaxUint32, math.MaxInt64, indexBaseFileName, ".ecx", false, false); err != nil {
+			if _, err := vs.doCopyFile(client, true, req.Collection, req.VolumeId, math.MaxUint32, math.MaxInt64, indexBaseFileName, ".ecx", false, false); err != nil {
 				return err
 			}
 			return nil
@@ -133,14 +146,14 @@ func (vs *VolumeServer) VolumeEcShardsCopy(ctx context.Context, req *volume_serv
 
 		if req.CopyEcjFile {
 			// copy ecj file
-			if err := vs.doCopyFile(client, true, req.Collection, req.VolumeId, math.MaxUint32, math.MaxInt64, indexBaseFileName, ".ecj", true, true); err != nil {
+			if _, err := vs.doCopyFile(client, true, req.Collection, req.VolumeId, math.MaxUint32, math.MaxInt64, indexBaseFileName, ".ecj", true, true); err != nil {
 				return err
 			}
 		}
 
 		if req.CopyVifFile {
 			// copy vif file
-			if err := vs.doCopyFile(client, true, req.Collection, req.VolumeId, math.MaxUint32, math.MaxInt64, dataBaseFileName, ".vif", false, true); err != nil {
+			if _, err := vs.doCopyFile(client, true, req.Collection, req.VolumeId, math.MaxUint32, math.MaxInt64, dataBaseFileName, ".vif", false, true); err != nil {
 				return err
 			}
 		}
diff --git a/weed/server/volume_grpc_remote.go b/weed/server/volume_grpc_remote.go
index 5ca6619bd..aff57e52b 100644
--- a/weed/server/volume_grpc_remote.go
+++ b/weed/server/volume_grpc_remote.go
@@ -3,11 +3,14 @@ package weed_server
 import (
 	"context"
 	"fmt"
-	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/operation"
 	"github.com/chrislusf/seaweedfs/weed/pb/volume_server_pb"
 	"github.com/chrislusf/seaweedfs/weed/remote_storage"
+	"github.com/chrislusf/seaweedfs/weed/security"
 	"github.com/chrislusf/seaweedfs/weed/storage/needle"
 	"github.com/chrislusf/seaweedfs/weed/storage/types"
+	"sync"
+	"time"
 )
 
 func (vs *VolumeServer) FetchAndWriteNeedle(ctx context.Context, req *volume_server_pb.FetchAndWriteNeedleRequest) (resp *volume_server_pb.FetchAndWriteNeedleResponse, err error) {
@@ -17,40 +20,64 @@ func (vs *VolumeServer) FetchAndWriteNeedle(ctx context.Context, req *volume_ser
 		return nil, fmt.Errorf("not found volume id %d", req.VolumeId)
 	}
 
-	remoteConf := &filer_pb.RemoteConf{
-		Type:        req.RemoteType,
-		Name:        req.RemoteName,
-		S3AccessKey: req.S3AccessKey,
-		S3SecretKey: req.S3SecretKey,
-		S3Region:    req.S3Region,
-		S3Endpoint:  req.S3Endpoint,
-	}
+	remoteConf := req.RemoteConf
 
 	client, getClientErr := remote_storage.GetRemoteStorage(remoteConf)
 	if getClientErr != nil {
 		return nil, fmt.Errorf("get remote client: %v", getClientErr)
 	}
 
-	remoteStorageLocation := &filer_pb.RemoteStorageLocation{
-		Name:   req.RemoteName,
-		Bucket: req.RemoteBucket,
-		Path:   req.RemotePath,
-	}
+	remoteStorageLocation := req.RemoteLocation
+
 	data, ReadRemoteErr := client.ReadFile(remoteStorageLocation, req.Offset, req.Size)
 	if ReadRemoteErr != nil {
 		return nil, fmt.Errorf("read from remote %+v: %v", remoteStorageLocation, ReadRemoteErr)
 	}
 
-	n := new(needle.Needle)
-	n.Id = types.NeedleId(req.NeedleId)
-	n.Cookie = types.Cookie(req.Cookie)
-	n.Data, n.DataSize = data, uint32(len(data))
-	// copied from *Needle.prepareWriteBuffer()
-	n.Size = 4 + types.Size(n.DataSize) + 1
-	n.Checksum = needle.NewCRC(n.Data)
-	if _, err = vs.store.WriteVolumeNeedle(v.Id, n, true, false); err != nil {
-		return nil, fmt.Errorf("write needle %d size %d: %v", req.NeedleId, req.Size, err)
+	var wg sync.WaitGroup
+	wg.Add(1)
+	go func() {
+		defer wg.Done()
+		n := new(needle.Needle)
+		n.Id = types.NeedleId(req.NeedleId)
+		n.Cookie = types.Cookie(req.Cookie)
+		n.Data, n.DataSize = data, uint32(len(data))
+		// copied from *Needle.prepareWriteBuffer()
+		n.Size = 4 + types.Size(n.DataSize) + 1
+		n.Checksum = needle.NewCRC(n.Data)
+		n.LastModified = uint64(time.Now().Unix())
+		n.SetHasLastModifiedDate()
+		if _, localWriteErr := vs.store.WriteVolumeNeedle(v.Id, n, true, false); localWriteErr != nil {
+			if err == nil {
+				err = fmt.Errorf("local write needle %d size %d: %v", req.NeedleId, req.Size, err)
+			}
+		}
+	}()
+	if len(req.Replicas)>0{
+		fileId := needle.NewFileId(v.Id, req.NeedleId, req.Cookie)
+		for _, replica := range req.Replicas {
+			wg.Add(1)
+			go func(targetVolumeServer string) {
+				defer wg.Done()
+				uploadOption := &operation.UploadOption{
+					UploadUrl:         fmt.Sprintf("http://%s/%s?type=replicate", targetVolumeServer, fileId.String()),
+					Filename:          "",
+					Cipher:            false,
+					IsInputCompressed: false,
+					MimeType:          "",
+					PairMap:           nil,
+					Jwt:               security.EncodedJwt(req.Auth),
+				}
+				if _, replicaWriteErr := operation.UploadData(data, uploadOption); replicaWriteErr != nil {
+					if err == nil {
+						err = fmt.Errorf("remote write needle %d size %d: %v", req.NeedleId, req.Size, err)
+					}
+				}
+			}(replica.Url)
+		}
 	}
 
-	return resp, nil
+	wg.Wait()
+
+	return resp, err
 }
diff --git a/weed/server/volume_server.go b/weed/server/volume_server.go
index 034521b4b..9406b5601 100644
--- a/weed/server/volume_server.go
+++ b/weed/server/volume_server.go
@@ -1,7 +1,6 @@
 package weed_server
 
 import (
-	"fmt"
 	"github.com/chrislusf/seaweedfs/weed/storage/types"
 	"net/http"
 	"sync"
@@ -113,7 +112,7 @@ func NewVolumeServer(adminMux, publicMux *http.ServeMux, ip string,
 	}
 
 	go vs.heartbeat()
-	go stats.LoopPushingMetric("volumeServer", fmt.Sprintf("%s:%d", ip, port), vs.metricsAddress, vs.metricsIntervalSec)
+	go stats.LoopPushingMetric("volumeServer", util.JoinHostPort(ip, port), vs.metricsAddress, vs.metricsIntervalSec)
 
 	return vs
 }
diff --git a/weed/server/webdav_server.go b/weed/server/webdav_server.go
index 68c1f3233..e99d4a358 100644
--- a/weed/server/webdav_server.go
+++ b/weed/server/webdav_server.go
@@ -413,7 +413,16 @@ func (f *WebDavFile) saveDataAsChunk(reader io.Reader, name string, offset int64
 	}
 
 	fileUrl := fmt.Sprintf("http://%s/%s", host, fileId)
-	uploadResult, flushErr, _ := operation.Upload(fileUrl, f.name, f.fs.option.Cipher, reader, false, "", nil, auth)
+	uploadOption := &operation.UploadOption{
+		UploadUrl:         fileUrl,
+		Filename:          f.name,
+		Cipher:            f.fs.option.Cipher,
+		IsInputCompressed: false,
+		MimeType:          "",
+		PairMap:           nil,
+		Jwt:               auth,
+	}
+	uploadResult, flushErr, _ := operation.Upload(reader, uploadOption)
 	if flushErr != nil {
 		glog.V(0).Infof("upload data %v to %s: %v", f.name, fileUrl, flushErr)
 		return nil, f.collection, f.replication, fmt.Errorf("upload data: %v", flushErr)
diff --git a/weed/shell/command_fs_cat.go b/weed/shell/command_fs_cat.go
index 3c5e13663..a5731240d 100644
--- a/weed/shell/command_fs_cat.go
+++ b/weed/shell/command_fs_cat.go
@@ -52,6 +52,11 @@ func (c *commandFsCat) Do(args []string, commandEnv *CommandEnv, writer io.Write
 			return err
 		}
 
+		if len(respLookupEntry.Entry.Content) > 0 {
+			_, err = writer.Write(respLookupEntry.Entry.Content)
+			return err
+		}
+
 		return filer.StreamContent(commandEnv.MasterClient, writer, respLookupEntry.Entry.Chunks, 0, math.MaxInt64)
 
 	})
diff --git a/weed/shell/command_fs_meta_save.go b/weed/shell/command_fs_meta_save.go
index b6f2a9172..d7cc2efef 100644
--- a/weed/shell/command_fs_meta_save.go
+++ b/weed/shell/command_fs_meta_save.go
@@ -3,6 +3,7 @@ package shell
 import (
 	"flag"
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/filer"
 	"io"
 	"os"
 	"path/filepath"
@@ -125,6 +126,10 @@ func doTraverseBfsAndSaving(filerClient filer_pb.FilerClient, writer io.Writer,
 
 	err := filer_pb.TraverseBfs(filerClient, util.FullPath(path), func(parentPath util.FullPath, entry *filer_pb.Entry) {
 
+		if strings.HasPrefix(string(parentPath), filer.SystemLogDir) {
+			return
+		}
+
 		protoMessage := &filer_pb.FullEntry{
 			Dir:   string(parentPath),
 			Entry: entry,
diff --git a/weed/shell/command_remote_cache.go b/weed/shell/command_remote_cache.go
index 21c479258..58b6d7b5e 100644
--- a/weed/shell/command_remote_cache.go
+++ b/weed/shell/command_remote_cache.go
@@ -5,8 +5,10 @@ import (
 	"fmt"
 	"github.com/chrislusf/seaweedfs/weed/filer"
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/remote_pb"
 	"github.com/chrislusf/seaweedfs/weed/util"
 	"io"
+	"sync"
 )
 
 func init() {
@@ -32,11 +34,14 @@ func (c *commandRemoteCache) Help() string {
 	remote.cache -dir=/xxx
 	remote.cache -dir=/xxx/some/sub/dir
 	remote.cache -dir=/xxx/some/sub/dir -include=*.pdf
+	remote.cache -dir=/xxx/some/sub/dir -exclude=*.txt
+	remote.cache -maxSize=1024000    # cache files smaller than 100K
+	remote.cache -maxAge=3600        # cache files less than 1 hour old
 
 	This is designed to run regularly. So you can add it to some cronjob.
 	If a file is already synchronized with the remote copy, the file will be skipped to avoid unnecessary copy.
 
-	The actual data copying goes through volume severs.
+	The actual data copying goes through volume severs in parallel.
 
 `
 }
@@ -45,21 +50,45 @@ func (c *commandRemoteCache) Do(args []string, commandEnv *CommandEnv, writer io
 
 	remoteMountCommand := flag.NewFlagSet(c.Name(), flag.ContinueOnError)
 
-	dir := remoteMountCommand.String("dir", "", "a directory in filer")
+	dir := remoteMountCommand.String("dir", "", "a mounted directory or one of its sub folders in filer")
+	concurrency := remoteMountCommand.Int("concurrent", 32, "concurrent file downloading")
 	fileFiler := newFileFilter(remoteMountCommand)
 
 	if err = remoteMountCommand.Parse(args); err != nil {
 		return nil
 	}
 
-	localMountedDir, remoteStorageMountedLocation, remoteStorageConf, detectErr := detectMountInfo(commandEnv, writer, *dir)
-	if detectErr != nil{
+	if *dir != "" {
+		if err := c.doCacheOneDirectory(commandEnv, writer, *dir, fileFiler, *concurrency); err != nil {
+			return err
+		}
+		return nil
+	}
+
+	mappings, err := filer.ReadMountMappings(commandEnv.option.GrpcDialOption, commandEnv.option.FilerAddress)
+	if err != nil {
+		return err
+	}
+
+	for key, _ := range mappings.Mappings {
+		if err := c.doCacheOneDirectory(commandEnv, writer, key, fileFiler, *concurrency); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func (c *commandRemoteCache) doCacheOneDirectory(commandEnv *CommandEnv, writer io.Writer, dir string, fileFiler *FileFilter, concurrency int) (error) {
+	mappings, localMountedDir, remoteStorageMountedLocation, remoteStorageConf, detectErr := detectMountInfo(commandEnv, writer, dir)
+	if detectErr != nil {
+		jsonPrintln(writer, mappings)
 		return detectErr
 	}
 
 	// pull content from remote
-	if err = c.cacheContentData(commandEnv, writer, util.FullPath(localMountedDir), remoteStorageMountedLocation, util.FullPath(*dir), fileFiler, remoteStorageConf); err != nil {
-		return fmt.Errorf("cache content data: %v", err)
+	if err := c.cacheContentData(commandEnv, writer, util.FullPath(localMountedDir), remoteStorageMountedLocation, util.FullPath(dir), fileFiler, remoteStorageConf, concurrency); err != nil {
+		return fmt.Errorf("cache content data on %s: %v", localMountedDir, err)
 	}
 
 	return nil
@@ -106,32 +135,53 @@ func mayHaveCachedToLocal(entry *filer_pb.Entry) bool {
 	if entry.RemoteEntry == nil {
 		return false // should not uncache an entry that is not in remote
 	}
-	if entry.RemoteEntry.LastLocalSyncTsNs > 0 && len(entry.Chunks) > 0 {
+	if entry.RemoteEntry.LastLocalSyncTsNs > 0 {
 		return true
 	}
 	return false
 }
 
-func (c *commandRemoteCache) cacheContentData(commandEnv *CommandEnv, writer io.Writer, localMountedDir util.FullPath, remoteMountedLocation *filer_pb.RemoteStorageLocation, dirToCache util.FullPath, fileFilter *FileFilter, remoteConf *filer_pb.RemoteConf) error {
+func (c *commandRemoteCache) cacheContentData(commandEnv *CommandEnv, writer io.Writer, localMountedDir util.FullPath, remoteMountedLocation *remote_pb.RemoteStorageLocation, dirToCache util.FullPath, fileFilter *FileFilter, remoteConf *remote_pb.RemoteConf, concurrency int) error {
+
+	var wg sync.WaitGroup
+	limitedConcurrentExecutor := util.NewLimitedConcurrentExecutor(concurrency)
+	var executionErr error
 
-	return recursivelyTraverseDirectory(commandEnv, dirToCache, func(dir util.FullPath, entry *filer_pb.Entry) bool {
+	traverseErr := recursivelyTraverseDirectory(commandEnv, dirToCache, func(dir util.FullPath, entry *filer_pb.Entry) bool {
 		if !shouldCacheToLocal(entry) {
 			return true // true means recursive traversal should continue
 		}
 
-		if fileFilter.matches(entry) {
+		if !fileFilter.matches(entry) {
 			return true
 		}
 
-		println(dir, entry.Name)
+		wg.Add(1)
+		limitedConcurrentExecutor.Execute(func() {
+			defer wg.Done()
+			fmt.Fprintf(writer, "Cache %+v ...\n", dir.Child(entry.Name))
 
-		remoteLocation := filer.MapFullPathToRemoteStorageLocation(localMountedDir, remoteMountedLocation, dir.Child(entry.Name))
+			remoteLocation := filer.MapFullPathToRemoteStorageLocation(localMountedDir, remoteMountedLocation, dir.Child(entry.Name))
 
-		if err := filer.DownloadToLocal(commandEnv, remoteConf, remoteLocation, dir, entry); err != nil {
-			fmt.Fprintf(writer, "DownloadToLocal %+v: %v\n", remoteLocation, err)
-			return false
-		}
+			if err := filer.DownloadToLocal(commandEnv, remoteConf, remoteLocation, dir, entry); err != nil {
+				fmt.Fprintf(writer, "DownloadToLocal %+v: %v\n", remoteLocation, err)
+				if executionErr == nil {
+					executionErr = fmt.Errorf("DownloadToLocal %+v: %v\n", remoteLocation, err)
+				}
+				return
+			}
+			fmt.Fprintf(writer, "Cache %+v Done\n", dir.Child(entry.Name))
+		})
 
 		return true
 	})
+	wg.Wait()
+
+	if traverseErr != nil {
+		return traverseErr
+	}
+	if executionErr != nil {
+		return executionErr
+	}
+	return nil
 }
diff --git a/weed/shell/command_remote_configure.go b/weed/shell/command_remote_configure.go
index 7a9ad1f65..3fa905237 100644
--- a/weed/shell/command_remote_configure.go
+++ b/weed/shell/command_remote_configure.go
@@ -6,6 +6,8 @@ import (
 	"fmt"
 	"github.com/chrislusf/seaweedfs/weed/filer"
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/remote_pb"
+	"github.com/chrislusf/seaweedfs/weed/remote_storage"
 	"github.com/chrislusf/seaweedfs/weed/util"
 	"github.com/golang/protobuf/jsonpb"
 	"github.com/golang/protobuf/proto"
@@ -32,7 +34,14 @@ func (c *commandRemoteConfigure) Help() string {
 	remote.configure
 
 	# set or update a configuration
-	remote.configure -name=cloud1 -type=s3 -access_key=xxx -secret_key=yyy
+	remote.configure -name=cloud1 -type=s3 -s3.access_key=xxx -s3.secret_key=yyy -s3.region=us-east-2
+	remote.configure -name=cloud2 -type=gcs -gcs.appCredentialsFile=~/service-account-file.json -gcs.projectId=yyy
+	remote.configure -name=cloud3 -type=azure -azure.account_name=xxx -azure.account_key=yyy
+	remote.configure -name=cloud4 -type=aliyun -aliyun.access_key=xxx -aliyun.secret_key=yyy -aliyun.endpoint=oss-cn-shenzhen.aliyuncs.com -aliyun.region=cn-sehnzhen
+	remote.configure -name=cloud5 -type=tencent -tencent.secret_id=xxx -tencent.secret_key=yyy -tencent.endpoint=cos.ap-guangzhou.myqcloud.com
+	remote.configure -name=cloud6 -type=wasabi -wasabi.access_key=xxx -wasabi.secret_key=yyy -wasabi.endpoint=s3.us-west-1.wasabisys.com -wasabi.region=us-west-1
+	remote.configure -name=cloud7 -type=storj -storj.access_key=xxx -storj.secret_key=yyy -storj.endpoint=https://gateway.us1.storjshare.io
+	remote.configure -name=cloud8 -type=filebase -filebase.access_key=xxx -filebase.secret_key=yyy -filebase.endpoint=https://s3.filebase.com
 
 	# delete one configuration
 	remote.configure -delete -name=cloud1
@@ -46,23 +55,79 @@ var (
 
 func (c *commandRemoteConfigure) Do(args []string, commandEnv *CommandEnv, writer io.Writer) (err error) {
 
-	conf := &filer_pb.RemoteConf{}
+	conf := &remote_pb.RemoteConf{}
 
 	remoteConfigureCommand := flag.NewFlagSet(c.Name(), flag.ContinueOnError)
 	isDelete := remoteConfigureCommand.Bool("delete", false, "delete one remote storage by its name")
 
 	remoteConfigureCommand.StringVar(&conf.Name, "name", "", "a short name to identify the remote storage")
-	remoteConfigureCommand.StringVar(&conf.Type, "type", "s3", "storage type, currently only support s3")
+	remoteConfigureCommand.StringVar(&conf.Type, "type", "s3", fmt.Sprintf("[%s] storage type", remote_storage.GetAllRemoteStorageNames()))
 
 	remoteConfigureCommand.StringVar(&conf.S3AccessKey, "s3.access_key", "", "s3 access key")
 	remoteConfigureCommand.StringVar(&conf.S3SecretKey, "s3.secret_key", "", "s3 secret key")
 	remoteConfigureCommand.StringVar(&conf.S3Region, "s3.region", "us-east-2", "s3 region")
 	remoteConfigureCommand.StringVar(&conf.S3Endpoint, "s3.endpoint", "", "endpoint for s3-compatible local object store")
+	remoteConfigureCommand.StringVar(&conf.S3StorageClass, "s3.storage_class", "", "s3 storage class")
+	remoteConfigureCommand.BoolVar(&conf.S3ForcePathStyle, "s3.force_path_style", true, "s3 force path style")
+	remoteConfigureCommand.BoolVar(&conf.S3V4Signature, "s3.v4_signature", false, "s3 V4 signature")
+
+	remoteConfigureCommand.StringVar(&conf.GcsGoogleApplicationCredentials, "gcs.appCredentialsFile", "", "google cloud storage credentials file, default to use env GOOGLE_APPLICATION_CREDENTIALS")
+	remoteConfigureCommand.StringVar(&conf.GcsProjectId, "gcs.projectId", "", "google cloud storage project id, default to use env GOOGLE_CLOUD_PROJECT")
+
+	remoteConfigureCommand.StringVar(&conf.AzureAccountName, "azure.account_name", "", "azure account name, default to use env AZURE_STORAGE_ACCOUNT")
+	remoteConfigureCommand.StringVar(&conf.AzureAccountKey, "azure.account_key", "", "azure account name, default to use env AZURE_STORAGE_ACCESS_KEY")
+
+	remoteConfigureCommand.StringVar(&conf.BackblazeKeyId, "b2.key_id", "", "backblaze keyID")
+	remoteConfigureCommand.StringVar(&conf.BackblazeApplicationKey, "b2.application_key", "", "backblaze applicationKey. Note that your Master Application Key will not work with the S3 Compatible API. You must create a new key that is eligible for use. For more information: https://help.backblaze.com/hc/en-us/articles/360047425453")
+	remoteConfigureCommand.StringVar(&conf.BackblazeEndpoint, "b2.endpoint", "", "backblaze endpoint")
+
+	remoteConfigureCommand.StringVar(&conf.AliyunAccessKey, "aliyun.access_key", "", "Aliyun access key, default to use env ALICLOUD_ACCESS_KEY_ID")
+	remoteConfigureCommand.StringVar(&conf.AliyunSecretKey, "aliyun.secret_key", "", "Aliyun secret key, default to use env ALICLOUD_ACCESS_KEY_SECRET")
+	remoteConfigureCommand.StringVar(&conf.AliyunEndpoint, "aliyun.endpoint", "", "Aliyun endpoint")
+	remoteConfigureCommand.StringVar(&conf.AliyunRegion, "aliyun.region", "", "Aliyun region")
+
+	remoteConfigureCommand.StringVar(&conf.TencentSecretId, "tencent.secret_id", "", "Tencent Secret Id, default to use env COS_SECRETID")
+	remoteConfigureCommand.StringVar(&conf.TencentSecretKey, "tencent.secret_key", "", "Tencent secret key, default to use env COS_SECRETKEY")
+	remoteConfigureCommand.StringVar(&conf.TencentEndpoint, "tencent.endpoint", "", "Tencent endpoint")
+
+	remoteConfigureCommand.StringVar(&conf.BaiduAccessKey, "baidu.access_key", "", "Baidu access key, default to use env BDCLOUD_ACCESS_KEY")
+	remoteConfigureCommand.StringVar(&conf.BaiduSecretKey, "baidu.secret_key", "", "Baidu secret key, default to use env BDCLOUD_SECRET_KEY")
+	remoteConfigureCommand.StringVar(&conf.BaiduEndpoint, "baidu.endpoint", "", "Baidu endpoint")
+	remoteConfigureCommand.StringVar(&conf.BaiduRegion, "baidu.region", "", "Baidu region")
+
+	remoteConfigureCommand.StringVar(&conf.WasabiAccessKey, "wasabi.access_key", "", "Wasabi access key")
+	remoteConfigureCommand.StringVar(&conf.WasabiSecretKey, "wasabi.secret_key", "", "Wasabi secret key")
+	remoteConfigureCommand.StringVar(&conf.WasabiEndpoint, "wasabi.endpoint", "", "Wasabi endpoint, see https://wasabi.com/wp-content/themes/wasabi/docs/API_Guide/index.html#t=topics%2Fapidiff-intro.htm")
+	remoteConfigureCommand.StringVar(&conf.WasabiRegion, "wasabi.region", "", "Wasabi region")
+
+	remoteConfigureCommand.StringVar(&conf.FilebaseAccessKey, "filebase.access_key", "", "Filebase access key")
+	remoteConfigureCommand.StringVar(&conf.FilebaseSecretKey, "filebase.secret_key", "", "Filebase secret key")
+	remoteConfigureCommand.StringVar(&conf.FilebaseEndpoint, "filebase.endpoint", "", "Filebase endpoint, https://s3.filebase.com")
+
+	remoteConfigureCommand.StringVar(&conf.StorjAccessKey, "storj.access_key", "", "Storj access key")
+	remoteConfigureCommand.StringVar(&conf.StorjSecretKey, "storj.secret_key", "", "Storj secret key")
+	remoteConfigureCommand.StringVar(&conf.StorjEndpoint, "storj.endpoint", "", "Storj endpoint")
+
+	var namenodes arrayFlags
+	remoteConfigureCommand.Var(&namenodes, "hdfs.namenodes", "hdfs name node and port, example: namenode1:8020,namenode2:8020")
+	remoteConfigureCommand.StringVar(&conf.HdfsUsername, "hdfs.username", "", "hdfs user name")
+	remoteConfigureCommand.StringVar(&conf.HdfsServicePrincipalName, "hdfs.servicePrincipalName", "", `Kerberos service principal name for the namenode
+
+Example: hdfs/namenode.hadoop.docker
+Namenode running as service 'hdfs' with FQDN 'namenode.hadoop.docker'.
+`)
+	remoteConfigureCommand.StringVar(&conf.HdfsDataTransferProtection, "hdfs.dataTransferProtection", "", "[authentication|integrity|privacy] Kerberos data transfer protection")
 
 	if err = remoteConfigureCommand.Parse(args); err != nil {
 		return nil
 	}
 
+	if conf.Type != "s3" {
+		// clear out the default values
+		conf.S3Region = ""
+		conf.S3ForcePathStyle = false
+	}
+
 	if conf.Name == "" {
 		return c.listExistingRemoteStorages(commandEnv, writer)
 	}
@@ -89,13 +154,20 @@ func (c *commandRemoteConfigure) listExistingRemoteStorages(commandEnv *CommandE
 		if !strings.HasSuffix(entry.Name, filer.REMOTE_STORAGE_CONF_SUFFIX) {
 			return nil
 		}
-		conf := &filer_pb.RemoteConf{}
+		conf := &remote_pb.RemoteConf{}
 
 		if err := proto.Unmarshal(entry.Content, conf); err != nil {
 			return fmt.Errorf("unmarshal %s/%s: %v", filer.DirectoryEtcRemote, entry.Name, err)
 		}
 
-		conf.S3SecretKey = ""
+		// change secret key to stars
+		conf.S3SecretKey = strings.Repeat("*", len(conf.S3SecretKey))
+		conf.AliyunSecretKey = strings.Repeat("*", len(conf.AliyunSecretKey))
+		conf.BaiduAccessKey = strings.Repeat("*", len(conf.BaiduAccessKey))
+		conf.FilebaseSecretKey = strings.Repeat("*", len(conf.FilebaseSecretKey))
+		conf.StorjSecretKey = strings.Repeat("*", len(conf.StorjSecretKey))
+		conf.TencentSecretKey = strings.Repeat("*", len(conf.TencentSecretKey))
+		conf.WasabiSecretKey = strings.Repeat("*", len(conf.WasabiSecretKey))
 
 		m := jsonpb.Marshaler{
 			EmitDefaults: false,
@@ -135,7 +207,7 @@ func (c *commandRemoteConfigure) deleteRemoteStorage(commandEnv *CommandEnv, wri
 
 }
 
-func (c *commandRemoteConfigure) saveRemoteStorage(commandEnv *CommandEnv, writer io.Writer, conf *filer_pb.RemoteConf) error {
+func (c *commandRemoteConfigure) saveRemoteStorage(commandEnv *CommandEnv, writer io.Writer, conf *remote_pb.RemoteConf) error {
 
 	data, err := proto.Marshal(conf)
 	if err != nil {
@@ -151,3 +223,14 @@ func (c *commandRemoteConfigure) saveRemoteStorage(commandEnv *CommandEnv, write
 	return nil
 
 }
+
+type arrayFlags []string
+
+func (i *arrayFlags) String() string {
+	return "my string representation"
+}
+
+func (i *arrayFlags) Set(value string) error {
+	*i = append(*i, value)
+	return nil
+}
diff --git a/weed/shell/command_remote_meta_sync.go b/weed/shell/command_remote_meta_sync.go
index b6fb15a62..5dbf55987 100644
--- a/weed/shell/command_remote_meta_sync.go
+++ b/weed/shell/command_remote_meta_sync.go
@@ -6,10 +6,10 @@ import (
 	"fmt"
 	"github.com/chrislusf/seaweedfs/weed/filer"
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/remote_pb"
 	"github.com/chrislusf/seaweedfs/weed/remote_storage"
 	"github.com/chrislusf/seaweedfs/weed/util"
 	"io"
-	"strings"
 )
 
 func init() {
@@ -54,55 +54,29 @@ func (c *commandRemoteMetaSync) Do(args []string, commandEnv *CommandEnv, writer
 		return nil
 	}
 
-	localMountedDir, remoteStorageMountedLocation, remoteStorageConf, detectErr := detectMountInfo(commandEnv, writer, *dir)
-	if detectErr != nil{
+	mappings, localMountedDir, remoteStorageMountedLocation, remoteStorageConf, detectErr := detectMountInfo(commandEnv, writer, *dir)
+	if detectErr != nil {
+		jsonPrintln(writer, mappings)
 		return detectErr
 	}
 
 	// pull metadata from remote
 	if err = pullMetadata(commandEnv, writer, util.FullPath(localMountedDir), remoteStorageMountedLocation, util.FullPath(*dir), remoteStorageConf); err != nil {
-		return fmt.Errorf("cache content data: %v", err)
+		return fmt.Errorf("cache meta data: %v", err)
 	}
 
 	return nil
 }
 
-func detectMountInfo(commandEnv *CommandEnv, writer io.Writer, dir string) (string, *filer_pb.RemoteStorageLocation, *filer_pb.RemoteConf, error) {
-	mappings, listErr := filer.ReadMountMappings(commandEnv.option.GrpcDialOption, commandEnv.option.FilerAddress)
-	if listErr != nil {
-		return "", nil, nil, listErr
-	}
-	if dir == "" {
-		jsonPrintln(writer, mappings)
-		return "", nil, nil, fmt.Errorf("need to specify '-dir' option")
-	}
-
-	var localMountedDir string
-	var remoteStorageMountedLocation *filer_pb.RemoteStorageLocation
-	for k, loc := range mappings.Mappings {
-		if strings.HasPrefix(dir, k) {
-			localMountedDir, remoteStorageMountedLocation = k, loc
-		}
-	}
-	if localMountedDir == "" {
-		jsonPrintln(writer, mappings)
-		return "", nil, nil, fmt.Errorf("%s is not mounted", dir)
-	}
-
-	// find remote storage configuration
-	remoteStorageConf, err := filer.ReadRemoteStorageConf(commandEnv.option.GrpcDialOption, commandEnv.option.FilerAddress, remoteStorageMountedLocation.Name)
-	if err != nil {
-		return "", nil, nil, err
-	}
-
-	return localMountedDir, remoteStorageMountedLocation, remoteStorageConf, nil
+func detectMountInfo(commandEnv *CommandEnv, writer io.Writer, dir string) (*remote_pb.RemoteStorageMapping, string, *remote_pb.RemoteStorageLocation, *remote_pb.RemoteConf, error) {
+	return filer.DetectMountInfo(commandEnv.option.GrpcDialOption, commandEnv.option.FilerAddress, dir)
 }
 
 /*
   This function update entry.RemoteEntry if the remote has any changes.
 
   To pull remote updates, or created for the first time, the criteria is:
-    entry == nil or (entry.RemoteEntry != nil and entry.RemoteEntry.RemoteTag != remote.RemoteTag)
+    entry == nil or (entry.RemoteEntry != nil and (entry.RemoteEntry.RemoteTag != remote.RemoteTag or entry.RemoteEntry.RemoteMTime < remote.RemoteMTime ))
   After the meta pull, the entry.RemoteEntry will have:
     remoteEntry.LastLocalSyncTsNs == 0
     Attributes.FileSize = uint64(remoteEntry.RemoteSize)
@@ -132,8 +106,8 @@ func detectMountInfo(commandEnv *CommandEnv, writer io.Writer, dir string) (stri
   If entry.RemoteEntry.RemoteTag != remoteEntry.RemoteTag {
     the remote version is updated, need to pull meta
   }
- */
-func pullMetadata(commandEnv *CommandEnv, writer io.Writer, localMountedDir util.FullPath, remoteMountedLocation *filer_pb.RemoteStorageLocation, dirToCache util.FullPath, remoteConf *filer_pb.RemoteConf) error {
+*/
+func pullMetadata(commandEnv *CommandEnv, writer io.Writer, localMountedDir util.FullPath, remoteMountedLocation *remote_pb.RemoteStorageLocation, dirToCache util.FullPath, remoteConf *remote_pb.RemoteConf) error {
 
 	// visit remote storage
 	remoteStorage, err := remote_storage.GetRemoteStorage(remoteConf)
@@ -184,7 +158,7 @@ func pullMetadata(commandEnv *CommandEnv, writer io.Writer, localMountedDir util
 					fmt.Fprintln(writer, " (skip)")
 					return nil
 				}
-				if existingEntry.RemoteEntry.RemoteETag != remoteEntry.RemoteETag {
+				if existingEntry.RemoteEntry.RemoteETag != remoteEntry.RemoteETag || existingEntry.RemoteEntry.RemoteMtime < remoteEntry.RemoteMtime {
 					// the remote version is updated, need to pull meta
 					fmt.Fprintln(writer, " (update)")
 					return doSaveRemoteEntry(client, string(localDir), existingEntry, remoteEntry)
diff --git a/weed/shell/command_remote_mount.go b/weed/shell/command_remote_mount.go
index 077c64e94..c2d9ec6ba 100644
--- a/weed/shell/command_remote_mount.go
+++ b/weed/shell/command_remote_mount.go
@@ -6,11 +6,15 @@ import (
 	"fmt"
 	"github.com/chrislusf/seaweedfs/weed/filer"
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/remote_pb"
 	"github.com/chrislusf/seaweedfs/weed/remote_storage"
 	"github.com/chrislusf/seaweedfs/weed/util"
 	"github.com/golang/protobuf/jsonpb"
 	"github.com/golang/protobuf/proto"
 	"io"
+	"os"
+	"strings"
+	"time"
 )
 
 func init() {
@@ -58,29 +62,31 @@ func (c *commandRemoteMount) Do(args []string, commandEnv *CommandEnv, writer io
 		return err
 	}
 
-	remoteStorageLocation := remote_storage.ParseLocation(*remote)
-
 	// find configuration for remote storage
-	// remotePath is /<bucket>/path/to/dir
-	remoteConf, err := c.findRemoteStorageConfiguration(commandEnv, writer, remoteStorageLocation)
+	remoteConf, err := filer.ReadRemoteStorageConf(commandEnv.option.GrpcDialOption, commandEnv.option.FilerAddress, remote_storage.ParseLocationName(*remote))
 	if err != nil {
 		return fmt.Errorf("find configuration for %s: %v", *remote, err)
 	}
 
+	remoteStorageLocation, err := remote_storage.ParseRemoteLocation(remoteConf.Type, *remote)
+	if err != nil {
+		return err
+	}
+
 	// sync metadata from remote
-	if err = c.syncMetadata(commandEnv, writer, *dir, *nonEmpty, remoteConf, remoteStorageLocation); err != nil {
+	if err = syncMetadata(commandEnv, writer, *dir, *nonEmpty, remoteConf, remoteStorageLocation); err != nil {
 		return fmt.Errorf("pull metadata: %v", err)
 	}
 
 	// store a mount configuration in filer
-	if err = c.saveMountMapping(commandEnv, writer, *dir, remoteStorageLocation); err != nil {
+	if err = filer.InsertMountMapping(commandEnv, *dir, remoteStorageLocation); err != nil {
 		return fmt.Errorf("save mount mapping: %v", err)
 	}
 
 	return nil
 }
 
-func listExistingRemoteStorageMounts(commandEnv *CommandEnv, writer io.Writer) (mappings *filer_pb.RemoteStorageMapping, err error) {
+func listExistingRemoteStorageMounts(commandEnv *CommandEnv, writer io.Writer) (mappings *remote_pb.RemoteStorageMapping, err error) {
 
 	// read current mapping
 	mappings, err = filer.ReadMountMappings(commandEnv.option.GrpcDialOption, commandEnv.option.FilerAddress)
@@ -95,6 +101,9 @@ func listExistingRemoteStorageMounts(commandEnv *CommandEnv, writer io.Writer) (
 }
 
 func jsonPrintln(writer io.Writer, message proto.Message) error {
+	if message == nil {
+		return nil
+	}
 	m := jsonpb.Marshaler{
 		EmitDefaults: false,
 		Indent:       "  ",
@@ -105,13 +114,7 @@ func jsonPrintln(writer io.Writer, message proto.Message) error {
 	return err
 }
 
-func (c *commandRemoteMount) findRemoteStorageConfiguration(commandEnv *CommandEnv, writer io.Writer, remote *filer_pb.RemoteStorageLocation) (conf *filer_pb.RemoteConf, err error) {
-
-	return filer.ReadRemoteStorageConf(commandEnv.option.GrpcDialOption, commandEnv.option.FilerAddress, remote.Name)
-
-}
-
-func (c *commandRemoteMount) syncMetadata(commandEnv *CommandEnv, writer io.Writer, dir string, nonEmpty bool, remoteConf *filer_pb.RemoteConf, remote *filer_pb.RemoteStorageLocation) error {
+func syncMetadata(commandEnv *CommandEnv, writer io.Writer, dir string, nonEmpty bool, remoteConf *remote_pb.RemoteConf, remote *remote_pb.RemoteStorageLocation) error {
 
 	// find existing directory, and ensure the directory is empty
 	err := commandEnv.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
@@ -121,7 +124,24 @@ func (c *commandRemoteMount) syncMetadata(commandEnv *CommandEnv, writer io.Writ
 			Name:      name,
 		})
 		if lookupErr != nil {
-			return fmt.Errorf("lookup %s: %v", dir, lookupErr)
+			if strings.Contains(lookupErr.Error(), filer_pb.ErrNotFound.Error()) {
+				_, createErr := client.CreateEntry(context.Background(), &filer_pb.CreateEntryRequest{
+					Directory: parent,
+					Entry: &filer_pb.Entry{
+						Name:        name,
+						IsDirectory: true,
+						Attributes: &filer_pb.FuseAttributes{
+							Mtime:    time.Now().Unix(),
+							Crtime:   time.Now().Unix(),
+							FileMode: uint32(0644 | os.ModeDir),
+						},
+						RemoteEntry: &filer_pb.RemoteEntry{
+							StorageName: remoteConf.Name,
+						},
+					},
+				})
+				return createErr
+			}
 		}
 
 		mountToDirIsEmpty := true
@@ -148,38 +168,7 @@ func (c *commandRemoteMount) syncMetadata(commandEnv *CommandEnv, writer io.Writ
 
 	// pull metadata from remote
 	if err = pullMetadata(commandEnv, writer, util.FullPath(dir), remote, util.FullPath(dir), remoteConf); err != nil {
-		return fmt.Errorf("cache content data: %v", err)
-	}
-
-	return nil
-}
-
-func (c *commandRemoteMount) saveMountMapping(commandEnv *CommandEnv, writer io.Writer, dir string, remoteStorageLocation *filer_pb.RemoteStorageLocation) (err error) {
-
-	// read current mapping
-	var oldContent, newContent []byte
-	err = commandEnv.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
-		oldContent, err = filer.ReadInsideFiler(client, filer.DirectoryEtcRemote, filer.REMOTE_STORAGE_MOUNT_FILE)
-		return err
-	})
-	if err != nil {
-		if err != filer_pb.ErrNotFound {
-			return fmt.Errorf("read existing mapping: %v", err)
-		}
-	}
-
-	// add new mapping
-	newContent, err = filer.AddRemoteStorageMapping(oldContent, dir, remoteStorageLocation)
-	if err != nil {
-		return fmt.Errorf("add mapping %s~%s: %v", dir, remoteStorageLocation, err)
-	}
-
-	// save back
-	err = commandEnv.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
-		return filer.SaveInsideFiler(client, filer.DirectoryEtcRemote, filer.REMOTE_STORAGE_MOUNT_FILE, newContent)
-	})
-	if err != nil {
-		return fmt.Errorf("save mapping: %v", err)
+		return fmt.Errorf("cache metadata: %v", err)
 	}
 
 	return nil
diff --git a/weed/shell/command_remote_mount_buckets.go b/weed/shell/command_remote_mount_buckets.go
new file mode 100644
index 000000000..f76629193
--- /dev/null
+++ b/weed/shell/command_remote_mount_buckets.go
@@ -0,0 +1,121 @@
+package shell
+
+import (
+	"flag"
+	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/filer"
+	"github.com/chrislusf/seaweedfs/weed/pb/remote_pb"
+	"github.com/chrislusf/seaweedfs/weed/remote_storage"
+	"github.com/chrislusf/seaweedfs/weed/util"
+	"io"
+	"path/filepath"
+	"regexp"
+)
+
+func init() {
+	Commands = append(Commands, &commandRemoteMountBuckets{})
+}
+
+type commandRemoteMountBuckets struct {
+}
+
+func (c *commandRemoteMountBuckets) Name() string {
+	return "remote.mount.buckets"
+}
+
+func (c *commandRemoteMountBuckets) Help() string {
+	return `mount all buckets in remote storage and pull its metadata
+
+	# assume a remote storage is configured to name "cloud1"
+	remote.configure -name=cloud1 -type=s3 -access_key=xxx -secret_key=yyy
+
+	# mount all buckets
+	remote.mount.buckets -remote=cloud1
+
+	# after mount, start a separate process to write updates to remote storage
+	weed filer.remote.sync -filer=<filerHost>:<filerPort> -createBucketAt=cloud1
+
+`
+}
+
+func (c *commandRemoteMountBuckets) Do(args []string, commandEnv *CommandEnv, writer io.Writer) (err error) {
+
+	remoteMountBucketsCommand := flag.NewFlagSet(c.Name(), flag.ContinueOnError)
+
+	remote := remoteMountBucketsCommand.String("remote", "", "an already configured storage name")
+	bucketPattern := remoteMountBucketsCommand.String("bucketPattern", "", "match existing bucket name with wildcard characters '*' and '?'")
+	trimBucketSuffix := remoteMountBucketsCommand.Bool("trimBucketSuffix", true, "remote suffix auto generated by 'weed filer.remote.sync'")
+	apply := remoteMountBucketsCommand.Bool("apply", false, "apply the mount for listed buckets")
+
+	if err = remoteMountBucketsCommand.Parse(args); err != nil {
+		return nil
+	}
+
+	if *remote == "" {
+		_, err = listExistingRemoteStorageMounts(commandEnv, writer)
+		return err
+	}
+
+	// find configuration for remote storage
+	remoteConf, err := filer.ReadRemoteStorageConf(commandEnv.option.GrpcDialOption, commandEnv.option.FilerAddress, *remote)
+	if err != nil {
+		return fmt.Errorf("find configuration for %s: %v", *remote, err)
+	}
+
+	// get storage client
+	remoteStorageClient, err := remote_storage.GetRemoteStorage(remoteConf)
+	if err != nil {
+		return fmt.Errorf("get storage client for %s: %v", *remote, err)
+	}
+
+	buckets, err := remoteStorageClient.ListBuckets()
+	if err != nil {
+		return fmt.Errorf("list buckets on %s: %v", *remote, err)
+	}
+
+	fillerBucketsPath, err := readFilerBucketsPath(commandEnv)
+	if err != nil {
+		return fmt.Errorf("read filer buckets path: %v", err)
+	}
+
+	hasSuffixPattern, _ := regexp.Compile(".+-[0-9][0-9][0-9][0-9]")
+
+	for _, bucket := range buckets {
+		if *bucketPattern != "" {
+			if matched, _ := filepath.Match(*bucketPattern, bucket.Name); !matched {
+				continue
+			}
+		}
+
+		fmt.Fprintf(writer, "bucket %s\n", bucket.Name)
+		localBucketName := bucket.Name
+		if *trimBucketSuffix {
+			if hasSuffixPattern.MatchString(localBucketName) {
+				localBucketName = localBucketName[:len(localBucketName)-5]
+				fmt.Fprintf(writer, "  mount bucket %s as %s\n", bucket.Name, localBucketName)
+			}
+		}
+		if *apply {
+
+			dir := util.FullPath(fillerBucketsPath).Child(localBucketName)
+			remoteStorageLocation := &remote_pb.RemoteStorageLocation{
+				Name:   *remote,
+				Bucket: bucket.Name,
+				Path:   "/",
+			}
+
+			// sync metadata from remote
+			if err = syncMetadata(commandEnv, writer, string(dir), true, remoteConf, remoteStorageLocation); err != nil {
+				return fmt.Errorf("pull metadata on %+v: %v", remoteStorageLocation, err)
+			}
+
+			// store a mount configuration in filer
+			if err = filer.InsertMountMapping(commandEnv, string(dir), remoteStorageLocation); err != nil {
+				return fmt.Errorf("save mount mapping %s to %+v: %v", dir, remoteStorageLocation, err)
+			}
+
+		}
+	}
+
+	return nil
+}
diff --git a/weed/shell/command_remote_uncache.go b/weed/shell/command_remote_uncache.go
index 0e5152f78..0d4e0cf7d 100644
--- a/weed/shell/command_remote_uncache.go
+++ b/weed/shell/command_remote_uncache.go
@@ -33,6 +33,8 @@ func (c *commandRemoteUncache) Help() string {
 	remote.uncache -dir=/xxx/some/sub/dir
 	remote.uncache -dir=/xxx/some/sub/dir -include=*.pdf
 	remote.uncache -dir=/xxx/some/sub/dir -exclude=*.txt
+	remote.uncache -minSize=1024000    # uncache files larger than 100K
+	remote.uncache -minAge=3600        # uncache files older than 1 hour
 
 `
 }
@@ -52,27 +54,30 @@ func (c *commandRemoteUncache) Do(args []string, commandEnv *CommandEnv, writer
 	if listErr != nil {
 		return listErr
 	}
-	if *dir == "" {
-		jsonPrintln(writer, mappings)
-		fmt.Fprintln(writer, "need to specify '-dir' option")
-		return nil
-	}
+	if *dir != "" {
+		var localMountedDir string
+		for k := range mappings.Mappings {
+			if strings.HasPrefix(*dir, k) {
+				localMountedDir = k
+			}
+		}
+		if localMountedDir == "" {
+			jsonPrintln(writer, mappings)
+			fmt.Fprintf(writer, "%s is not mounted\n", *dir)
+			return nil
+		}
 
-	var localMountedDir string
-	for k := range mappings.Mappings {
-		if strings.HasPrefix(*dir, k) {
-			localMountedDir = k
+		// pull content from remote
+		if err = c.uncacheContentData(commandEnv, writer, util.FullPath(*dir), fileFiler); err != nil {
+			return fmt.Errorf("uncache content data: %v", err)
 		}
-	}
-	if localMountedDir == "" {
-		jsonPrintln(writer, mappings)
-		fmt.Fprintf(writer, "%s is not mounted\n", *dir)
 		return nil
 	}
 
-	// pull content from remote
-	if err = c.uncacheContentData(commandEnv, writer, util.FullPath(*dir), fileFiler); err != nil {
-		return fmt.Errorf("cache content data: %v", err)
+	for key, _ := range mappings.Mappings {
+		if err := c.uncacheContentData(commandEnv, writer, util.FullPath(key), fileFiler); err != nil {
+			return err
+		}
 	}
 
 	return nil
@@ -81,11 +86,12 @@ func (c *commandRemoteUncache) Do(args []string, commandEnv *CommandEnv, writer
 func (c *commandRemoteUncache) uncacheContentData(commandEnv *CommandEnv, writer io.Writer, dirToCache util.FullPath, fileFilter *FileFilter) error {
 
 	return recursivelyTraverseDirectory(commandEnv, dirToCache, func(dir util.FullPath, entry *filer_pb.Entry) bool {
+
 		if !mayHaveCachedToLocal(entry) {
 			return true // true means recursive traversal should continue
 		}
 
-		if fileFilter.matches(entry) {
+		if !fileFilter.matches(entry) {
 			return true
 		}
 
@@ -96,7 +102,7 @@ func (c *commandRemoteUncache) uncacheContentData(commandEnv *CommandEnv, writer
 		entry.RemoteEntry.LastLocalSyncTsNs = 0
 		entry.Chunks = nil
 
-		println(dir, entry.Name)
+		fmt.Fprintf(writer, "Uncache %+v ... ", dir.Child(entry.Name))
 
 		err := commandEnv.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
 			_, updateErr := client.UpdateEntry(context.Background(), &filer_pb.UpdateEntryRequest{
@@ -109,6 +115,7 @@ func (c *commandRemoteUncache) uncacheContentData(commandEnv *CommandEnv, writer
 			fmt.Fprintf(writer, "uncache %+v: %v\n", dir.Child(entry.Name), err)
 			return false
 		}
+		fmt.Fprintf(writer, "Done\n")
 
 		return true
 	})
@@ -137,12 +144,12 @@ func newFileFilter(remoteMountCommand *flag.FlagSet) (ff *FileFilter) {
 func (ff *FileFilter) matches(entry *filer_pb.Entry) bool {
 	if *ff.include != "" {
 		if ok, _ := filepath.Match(*ff.include, entry.Name); !ok {
-			return true
+			return false
 		}
 	}
 	if *ff.exclude != "" {
 		if ok, _ := filepath.Match(*ff.exclude, entry.Name); ok {
-			return true
+			return false
 		}
 	}
 	if *ff.minSize != -1 {
@@ -165,5 +172,5 @@ func (ff *FileFilter) matches(entry *filer_pb.Entry) bool {
 			return false
 		}
 	}
-	return false
+	return true
 }
diff --git a/weed/shell/command_remote_unmount.go b/weed/shell/command_remote_unmount.go
index b65d125aa..04fd5e388 100644
--- a/weed/shell/command_remote_unmount.go
+++ b/weed/shell/command_remote_unmount.go
@@ -6,8 +6,10 @@ import (
 	"fmt"
 	"github.com/chrislusf/seaweedfs/weed/filer"
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/remote_storage"
 	"github.com/chrislusf/seaweedfs/weed/util"
 	"io"
+	"time"
 )
 
 func init() {
@@ -58,25 +60,26 @@ func (c *commandRemoteUnmount) Do(args []string, commandEnv *CommandEnv, writer
 		return fmt.Errorf("directory %s is not mounted", *dir)
 	}
 
+	// store a mount configuration in filer
+	fmt.Fprintf(writer, "deleting mount for %s ...\n", *dir)
+	if err = filer.DeleteMountMapping(commandEnv, *dir); err != nil {
+		return fmt.Errorf("delete mount mapping: %v", err)
+	}
+
 	// purge mounted data
+	fmt.Fprintf(writer, "purge %s ...\n", *dir)
 	if err = c.purgeMountedData(commandEnv, *dir); err != nil {
 		return fmt.Errorf("purge mounted data: %v", err)
 	}
 
-	// store a mount configuration in filer
-	if err = c.deleteMountMapping(commandEnv, *dir); err != nil {
-		return fmt.Errorf("delete mount mapping: %v", err)
+	// reset remote sync offset in case the folder is mounted again
+	if err = remote_storage.SetSyncOffset(commandEnv.option.GrpcDialOption, commandEnv.option.FilerAddress, *dir, time.Now().UnixNano()); err != nil {
+		return fmt.Errorf("reset remote.sync offset for %s: %v", *dir, err)
 	}
 
 	return nil
 }
 
-func (c *commandRemoteUnmount) findRemoteStorageConfiguration(commandEnv *CommandEnv, writer io.Writer, remote *filer_pb.RemoteStorageLocation) (conf *filer_pb.RemoteConf, err error) {
-
-	return filer.ReadRemoteStorageConf(commandEnv.option.GrpcDialOption, commandEnv.option.FilerAddress, remote.Name)
-
-}
-
 func (c *commandRemoteUnmount) purgeMountedData(commandEnv *CommandEnv, dir string) error {
 
 	// find existing directory, and ensure the directory is empty
@@ -100,6 +103,8 @@ func (c *commandRemoteUnmount) purgeMountedData(commandEnv *CommandEnv, dir stri
 		mkdirErr := filer_pb.DoMkdir(client, parent, name, func(entry *filer_pb.Entry) {
 			entry.Attributes = oldEntry.Attributes
 			entry.Extended = oldEntry.Extended
+			entry.Attributes.Crtime = time.Now().Unix()
+			entry.Attributes.Mtime = time.Now().Unix()
 		})
 		if mkdirErr != nil {
 			return fmt.Errorf("mkdir %s: %v", dir, mkdirErr)
@@ -114,33 +119,3 @@ func (c *commandRemoteUnmount) purgeMountedData(commandEnv *CommandEnv, dir stri
 	return nil
 }
 
-func (c *commandRemoteUnmount) deleteMountMapping(commandEnv *CommandEnv, dir string) (err error) {
-
-	// read current mapping
-	var oldContent, newContent []byte
-	err = commandEnv.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
-		oldContent, err = filer.ReadInsideFiler(client, filer.DirectoryEtcRemote, filer.REMOTE_STORAGE_MOUNT_FILE)
-		return err
-	})
-	if err != nil {
-		if err != filer_pb.ErrNotFound {
-			return fmt.Errorf("read existing mapping: %v", err)
-		}
-	}
-
-	// add new mapping
-	newContent, err = filer.RemoveRemoteStorageMapping(oldContent, dir)
-	if err != nil {
-		return fmt.Errorf("delete mount %s: %v", dir, err)
-	}
-
-	// save back
-	err = commandEnv.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
-		return filer.SaveInsideFiler(client, filer.DirectoryEtcRemote, filer.REMOTE_STORAGE_MOUNT_FILE, newContent)
-	})
-	if err != nil {
-		return fmt.Errorf("save mapping: %v", err)
-	}
-
-	return nil
-}
diff --git a/weed/shell/command_volume_fix_replication.go b/weed/shell/command_volume_fix_replication.go
index 20d004c6b..efd5ae5de 100644
--- a/weed/shell/command_volume_fix_replication.go
+++ b/weed/shell/command_volume_fix_replication.go
@@ -29,7 +29,7 @@ func (c *commandVolumeFixReplication) Name() string {
 }
 
 func (c *commandVolumeFixReplication) Help() string {
-	return `add replicas to volumes that are missing replicas
+	return `add or remove replicas to volumes that are missing replicas or over-replicated
 
 	This command finds all over-replicated volumes. If found, it will purge the oldest copies and stop.
 
diff --git a/weed/shell/commands.go b/weed/shell/commands.go
index 5497e89cc..aef71b419 100644
--- a/weed/shell/commands.go
+++ b/weed/shell/commands.go
@@ -98,7 +98,7 @@ var _ = filer_pb.FilerClient(&CommandEnv{})
 
 func (ce *CommandEnv) WithFilerClient(fn func(filer_pb.SeaweedFilerClient) error) error {
 
-	filerGrpcAddress := fmt.Sprintf("%s:%d", ce.option.FilerHost, ce.option.FilerPort+10000)
+	filerGrpcAddress := util.JoinHostPort(ce.option.FilerHost, int(ce.option.FilerPort+10000))
 	return pb.WithGrpcFilerClient(filerGrpcAddress, ce.option.GrpcDialOption, fn)
 
 }
diff --git a/weed/shell/shell_liner.go b/weed/shell/shell_liner.go
index 765b0efda..db9e815ff 100644
--- a/weed/shell/shell_liner.go
+++ b/weed/shell/shell_liner.go
@@ -1,7 +1,9 @@
 package shell
 
 import (
+	"context"
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
 	"github.com/chrislusf/seaweedfs/weed/util/grace"
 	"io"
 	"os"
@@ -45,6 +47,24 @@ func RunShell(options ShellOptions) {
 	go commandEnv.MasterClient.KeepConnectedToMaster()
 	commandEnv.MasterClient.WaitUntilConnected()
 
+	if commandEnv.option.FilerAddress != "" {
+		commandEnv.WithFilerClient(func(filerClient filer_pb.SeaweedFilerClient) error {
+			resp, err := filerClient.GetFilerConfiguration(context.Background(), &filer_pb.GetFilerConfigurationRequest{})
+			if err != nil {
+				return err
+			}
+			if resp.ClusterId != "" {
+				fmt.Printf(`
+---
+Free Monitoring Data URL:
+https://cloud.seaweedfs.com/ui/%s
+---
+`, resp.ClusterId)
+			}
+			return nil
+		})
+	}
+
 	for {
 		cmd, err := line.Prompt("> ")
 		if err != nil {
@@ -64,10 +84,12 @@ func RunShell(options ShellOptions) {
 
 func processEachCmd(reg *regexp.Regexp, cmd string, commandEnv *CommandEnv) bool {
 	cmds := reg.FindAllString(cmd, -1)
+
+	line.AppendHistory(cmd)
+
 	if len(cmds) == 0 {
 		return false
 	} else {
-		line.AppendHistory(cmd)
 
 		args := make([]string, len(cmds[1:]))
 
diff --git a/weed/stats/disk_notsupported.go b/weed/stats/disk_notsupported.go
index 3d99e6ce7..2bc24a2f0 100644
--- a/weed/stats/disk_notsupported.go
+++ b/weed/stats/disk_notsupported.go
@@ -1,3 +1,4 @@
+//go:build openbsd || netbsd || plan9 || solaris
 // +build openbsd netbsd plan9 solaris
 
 package stats
diff --git a/weed/stats/disk_supported.go b/weed/stats/disk_supported.go
index dff580b5b..e698b0095 100644
--- a/weed/stats/disk_supported.go
+++ b/weed/stats/disk_supported.go
@@ -1,3 +1,4 @@
+//go:build !windows && !openbsd && !netbsd && !plan9 && !solaris
 // +build !windows,!openbsd,!netbsd,!plan9,!solaris
 
 package stats
diff --git a/weed/stats/memory_notsupported.go b/weed/stats/memory_notsupported.go
index 2bed95266..2508b561b 100644
--- a/weed/stats/memory_notsupported.go
+++ b/weed/stats/memory_notsupported.go
@@ -1,3 +1,4 @@
+//go:build !linux
 // +build !linux
 
 package stats
diff --git a/weed/stats/memory_supported.go b/weed/stats/memory_supported.go
index 91fdd005b..55ad4c6bb 100644
--- a/weed/stats/memory_supported.go
+++ b/weed/stats/memory_supported.go
@@ -1,3 +1,4 @@
+//go:build linux
 // +build linux
 
 package stats
diff --git a/weed/stats/metrics.go b/weed/stats/metrics.go
index 48d964418..1e1681f9a 100644
--- a/weed/stats/metrics.go
+++ b/weed/stats/metrics.go
@@ -3,8 +3,10 @@ package stats
 import (
 	"fmt"
 	"log"
+	"net"
 	"net/http"
 	"os"
+	"strconv"
 	"strings"
 	"time"
 
@@ -180,5 +182,5 @@ func SourceName(port uint32) string {
 	if err != nil {
 		return "unknown"
 	}
-	return fmt.Sprintf("%s:%d", hostname, port)
+	return net.JoinHostPort(hostname, strconv.Itoa(int(port)))
 }
diff --git a/weed/storage/backend/memory_map/memory_map_other.go b/weed/storage/backend/memory_map/memory_map_other.go
index e06a0b59a..63c168f6a 100644
--- a/weed/storage/backend/memory_map/memory_map_other.go
+++ b/weed/storage/backend/memory_map/memory_map_other.go
@@ -1,3 +1,4 @@
+//go:build !windows
 // +build !windows
 
 package memory_map
diff --git a/weed/storage/backend/memory_map/memory_map_windows.go b/weed/storage/backend/memory_map/memory_map_windows.go
index 7eb713442..4a1a48f99 100644
--- a/weed/storage/backend/memory_map/memory_map_windows.go
+++ b/weed/storage/backend/memory_map/memory_map_windows.go
@@ -1,3 +1,4 @@
+//go:build windows
 // +build windows
 
 package memory_map
diff --git a/weed/storage/backend/s3_backend/s3_sessions.go b/weed/storage/backend/s3_backend/s3_sessions.go
index b8378c379..be10ad8e5 100644
--- a/weed/storage/backend/s3_backend/s3_sessions.go
+++ b/weed/storage/backend/s3_backend/s3_sessions.go
@@ -34,9 +34,10 @@ func createSession(awsAccessKeyId, awsSecretAccessKey, region, endpoint string)
 	}
 
 	config := &aws.Config{
-		Region:           aws.String(region),
-		Endpoint:         aws.String(endpoint),
-		S3ForcePathStyle: aws.Bool(true),
+		Region:                        aws.String(region),
+		Endpoint:                      aws.String(endpoint),
+		S3ForcePathStyle:              aws.Bool(true),
+		S3DisableContentMD5Validation: aws.Bool(true),
 	}
 	if awsAccessKeyId != "" && awsSecretAccessKey != "" {
 		config.Credentials = credentials.NewStaticCredentials(awsAccessKeyId, awsSecretAccessKey, "")
diff --git a/weed/storage/backend/volume_create.go b/weed/storage/backend/volume_create.go
index d4bd8e40f..93719198b 100644
--- a/weed/storage/backend/volume_create.go
+++ b/weed/storage/backend/volume_create.go
@@ -1,3 +1,4 @@
+//go:build !linux && !windows
 // +build !linux,!windows
 
 package backend
diff --git a/weed/storage/backend/volume_create_linux.go b/weed/storage/backend/volume_create_linux.go
index 260c2c2a3..9b03dcda2 100644
--- a/weed/storage/backend/volume_create_linux.go
+++ b/weed/storage/backend/volume_create_linux.go
@@ -1,3 +1,4 @@
+//go:build linux
 // +build linux
 
 package backend
diff --git a/weed/storage/backend/volume_create_windows.go b/weed/storage/backend/volume_create_windows.go
index 7d40ec0d7..0bbb4959b 100644
--- a/weed/storage/backend/volume_create_windows.go
+++ b/weed/storage/backend/volume_create_windows.go
@@ -1,3 +1,4 @@
+//go:build windows
 // +build windows
 
 package backend
diff --git a/weed/storage/disk_location.go b/weed/storage/disk_location.go
index 33dd272ce..f16963356 100644
--- a/weed/storage/disk_location.go
+++ b/weed/storage/disk_location.go
@@ -247,13 +247,15 @@ func (l *DiskLocation) LoadVolume(vid needle.VolumeId, needleMapKind NeedleMapKi
 	return false
 }
 
+var ErrVolumeNotFound = fmt.Errorf("volume not found")
+
 func (l *DiskLocation) DeleteVolume(vid needle.VolumeId) error {
 	l.volumesLock.Lock()
 	defer l.volumesLock.Unlock()
 
 	_, ok := l.volumes[vid]
 	if !ok {
-		return fmt.Errorf("Volume not found, VolumeId: %d", vid)
+		return ErrVolumeNotFound
 	}
 	_, err := l.deleteVolumeById(vid)
 	return err
@@ -265,7 +267,7 @@ func (l *DiskLocation) UnloadVolume(vid needle.VolumeId) error {
 
 	v, ok := l.volumes[vid]
 	if !ok {
-		return fmt.Errorf("Volume not loaded, VolumeId: %d", vid)
+		return ErrVolumeNotFound
 	}
 	v.Close()
 	delete(l.volumes, vid)
diff --git a/weed/storage/erasure_coding/ec_volume.go b/weed/storage/erasure_coding/ec_volume.go
index 171db92a4..a6e880350 100644
--- a/weed/storage/erasure_coding/ec_volume.go
+++ b/weed/storage/erasure_coding/ec_volume.go
@@ -3,13 +3,13 @@ package erasure_coding
 import (
 	"errors"
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/storage/volume_info"
 	"math"
 	"os"
 	"sort"
 	"sync"
 	"time"
 
-	"github.com/chrislusf/seaweedfs/weed/pb"
 	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
 	"github.com/chrislusf/seaweedfs/weed/pb/volume_server_pb"
 	"github.com/chrislusf/seaweedfs/weed/storage/idx"
@@ -63,10 +63,10 @@ func NewEcVolume(diskType types.DiskType, dir string, dirIdx string, collection
 
 	// read volume info
 	ev.Version = needle.Version3
-	if volumeInfo, _, found, _ := pb.MaybeLoadVolumeInfo(dataBaseFileName + ".vif"); found {
+	if volumeInfo, _, found, _ := volume_info.MaybeLoadVolumeInfo(dataBaseFileName + ".vif"); found {
 		ev.Version = needle.Version(volumeInfo.Version)
 	} else {
-		pb.SaveVolumeInfo(dataBaseFileName+".vif", &volume_server_pb.VolumeInfo{Version: uint32(ev.Version)})
+		volume_info.SaveVolumeInfo(dataBaseFileName+".vif", &volume_server_pb.VolumeInfo{Version: uint32(ev.Version)})
 	}
 
 	ev.ShardLocations = make(map[ShardId][]string)
diff --git a/weed/storage/needle/crc.go b/weed/storage/needle/crc.go
index 4476631c2..b7d3edd83 100644
--- a/weed/storage/needle/crc.go
+++ b/weed/storage/needle/crc.go
@@ -4,7 +4,7 @@ import (
 	"fmt"
 	"io"
 
-	"github.com/klauspost/crc32"
+	"hash/crc32"
 
 	"github.com/chrislusf/seaweedfs/weed/util"
 )
diff --git a/weed/storage/needle/needle_read_write.go b/weed/storage/needle/needle_read_write.go
index 3b9eb7237..4f9e7f661 100644
--- a/weed/storage/needle/needle_read_write.go
+++ b/weed/storage/needle/needle_read_write.go
@@ -205,7 +205,7 @@ func ReadNeedleBlob(r backend.BackendStorageFile, offset int64, size Size, versi
 	}
 	if err != nil {
 		fileSize, _, _ := r.GetStat()
-		println("n", n, "dataSize", dataSize, "offset", offset, "fileSize", fileSize)
+		glog.Errorf("%s read %d dataSize %d offset %d fileSize %d: %v", r.Name(), n, dataSize, offset, fileSize, err)
 	}
 	return dataSlice, err
 
diff --git a/weed/storage/needle_map/compact_map_cases_test.go b/weed/storage/needle_map/compact_map_cases_test.go
index 305925699..83376e3e8 100644
--- a/weed/storage/needle_map/compact_map_cases_test.go
+++ b/weed/storage/needle_map/compact_map_cases_test.go
@@ -1,3 +1,4 @@
+//go:build 5BytesOffset
 // +build 5BytesOffset
 
 package needle_map
diff --git a/weed/storage/needle_map_metric.go b/weed/storage/needle_map_metric.go
index 3618dada9..0bdfdcedc 100644
--- a/weed/storage/needle_map_metric.go
+++ b/weed/storage/needle_map_metric.go
@@ -7,7 +7,7 @@ import (
 
 	"github.com/chrislusf/seaweedfs/weed/storage/idx"
 	. "github.com/chrislusf/seaweedfs/weed/storage/types"
-	"github.com/willf/bloom"
+	"github.com/tylertreat/BoomFilters"
 )
 
 type mapMetric struct {
@@ -93,10 +93,10 @@ func (mm *mapMetric) MaybeSetMaxFileKey(key NeedleId) {
 
 func newNeedleMapMetricFromIndexFile(r *os.File) (mm *mapMetric, err error) {
 	mm = &mapMetric{}
-	var bf *bloom.BloomFilter
+	var bf *boom.BloomFilter
 	buf := make([]byte, NeedleIdSize)
 	err = reverseWalkIndexFile(r, func(entryCount int64) {
-		bf = bloom.NewWithEstimates(uint(entryCount), 0.001)
+		bf = boom.NewBloomFilter(uint(entryCount), 0.001)
 	}, func(key NeedleId, offset Offset, size Size) error {
 
 		mm.MaybeSetMaxFileKey(key)
@@ -105,9 +105,8 @@ func newNeedleMapMetricFromIndexFile(r *os.File) (mm *mapMetric, err error) {
 			mm.FileByteCounter += uint64(size)
 		}
 
-		if !bf.Test(buf) {
+		if !bf.TestAndAdd(buf) {
 			mm.FileCounter++
-			bf.Add(buf)
 		} else {
 			// deleted file
 			mm.DeletionCounter++
diff --git a/weed/storage/store.go b/weed/storage/store.go
index fe3ec1912..b5f8f9c4b 100644
--- a/weed/storage/store.go
+++ b/weed/storage/store.go
@@ -2,6 +2,7 @@ package storage
 
 import (
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/storage/volume_info"
 	"github.com/chrislusf/seaweedfs/weed/util"
 	"path/filepath"
 	"strings"
@@ -10,7 +11,6 @@ import (
 	"google.golang.org/grpc"
 
 	"github.com/chrislusf/seaweedfs/weed/glog"
-	"github.com/chrislusf/seaweedfs/weed/pb"
 	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
 	"github.com/chrislusf/seaweedfs/weed/stats"
 	"github.com/chrislusf/seaweedfs/weed/storage/erasure_coding"
@@ -428,7 +428,7 @@ func (s *Store) UnmountVolume(i needle.VolumeId) error {
 	}
 
 	for _, location := range s.Locations {
-		if err := location.UnloadVolume(i); err == nil {
+		if err := location.UnloadVolume(i); err == nil || err == ErrVolumeNotFound {
 			glog.V(0).Infof("UnmountVolume %d", i)
 			s.DeletedVolumesChan <- message
 			return nil
@@ -452,7 +452,7 @@ func (s *Store) DeleteVolume(i needle.VolumeId) error {
 		DiskType:         string(v.location.DiskType),
 	}
 	for _, location := range s.Locations {
-		if err := location.DeleteVolume(i); err == nil {
+		if err := location.DeleteVolume(i); err == nil || err == ErrVolumeNotFound {
 			glog.V(0).Infof("DeleteVolume %d", i)
 			s.DeletedVolumesChan <- message
 			return nil
@@ -474,12 +474,12 @@ func (s *Store) ConfigureVolume(i needle.VolumeId, replication string) error {
 		// load, modify, save
 		baseFileName := strings.TrimSuffix(fileInfo.Name(), filepath.Ext(fileInfo.Name()))
 		vifFile := filepath.Join(location.Directory, baseFileName+".vif")
-		volumeInfo, _, _, err := pb.MaybeLoadVolumeInfo(vifFile)
+		volumeInfo, _, _, err := volume_info.MaybeLoadVolumeInfo(vifFile)
 		if err != nil {
 			return fmt.Errorf("volume %d fail to load vif", i)
 		}
 		volumeInfo.Replication = replication
-		err = pb.SaveVolumeInfo(vifFile, volumeInfo)
+		err = volume_info.SaveVolumeInfo(vifFile, volumeInfo)
 		if err != nil {
 			return fmt.Errorf("volume %d fail to save vif", i)
 		}
diff --git a/weed/storage/types/offset_4bytes.go b/weed/storage/types/offset_4bytes.go
index 5348d5b36..5835b24d7 100644
--- a/weed/storage/types/offset_4bytes.go
+++ b/weed/storage/types/offset_4bytes.go
@@ -1,3 +1,4 @@
+//go:build !5BytesOffset
 // +build !5BytesOffset
 
 package types
diff --git a/weed/storage/types/offset_5bytes.go b/weed/storage/types/offset_5bytes.go
index b6181fc11..4b16bd822 100644
--- a/weed/storage/types/offset_5bytes.go
+++ b/weed/storage/types/offset_5bytes.go
@@ -1,3 +1,4 @@
+//go:build 5BytesOffset
 // +build 5BytesOffset
 
 package types
diff --git a/weed/pb/volume_info.go b/weed/storage/volume_info/volume_info.go
index cae9e018f..b7ef75171 100644
--- a/weed/pb/volume_info.go
+++ b/weed/storage/volume_info/volume_info.go
@@ -1,4 +1,4 @@
-package pb
+package volume_info
 
 import (
 	"bytes"
diff --git a/weed/storage/volume_tier.go b/weed/storage/volume_tier.go
index 23160906b..190775b74 100644
--- a/weed/storage/volume_tier.go
+++ b/weed/storage/volume_tier.go
@@ -2,11 +2,11 @@ package storage
 
 import (
 	"github.com/chrislusf/seaweedfs/weed/glog"
-	"github.com/chrislusf/seaweedfs/weed/pb"
 	"github.com/chrislusf/seaweedfs/weed/pb/volume_server_pb"
 	"github.com/chrislusf/seaweedfs/weed/storage/backend"
 	_ "github.com/chrislusf/seaweedfs/weed/storage/backend/s3_backend"
 	"github.com/chrislusf/seaweedfs/weed/storage/needle"
+	volume_info "github.com/chrislusf/seaweedfs/weed/storage/volume_info"
 )
 
 func (v *Volume) GetVolumeInfo() *volume_server_pb.VolumeInfo {
@@ -16,7 +16,7 @@ func (v *Volume) GetVolumeInfo() *volume_server_pb.VolumeInfo {
 func (v *Volume) maybeLoadVolumeInfo() (found bool) {
 
 	var err error
-	v.volumeInfo, v.hasRemoteFile, found, err = pb.MaybeLoadVolumeInfo(v.FileName(".vif"))
+	v.volumeInfo, v.hasRemoteFile, found, err = volume_info.MaybeLoadVolumeInfo(v.FileName(".vif"))
 
 	if v.volumeInfo.Version == 0 {
 		v.volumeInfo.Version = uint32(needle.CurrentVersion)
@@ -56,6 +56,6 @@ func (v *Volume) SaveVolumeInfo() error {
 
 	tierFileName := v.FileName(".vif")
 
-	return pb.SaveVolumeInfo(tierFileName, v.volumeInfo)
+	return volume_info.SaveVolumeInfo(tierFileName, v.volumeInfo)
 
 }
diff --git a/weed/topology/data_node.go b/weed/topology/data_node.go
index 2813f7b45..cd3249c98 100644
--- a/weed/topology/data_node.go
+++ b/weed/topology/data_node.go
@@ -2,14 +2,12 @@ package topology
 
 import (
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
+	"github.com/chrislusf/seaweedfs/weed/storage"
 	"github.com/chrislusf/seaweedfs/weed/storage/needle"
 	"github.com/chrislusf/seaweedfs/weed/storage/types"
 	"github.com/chrislusf/seaweedfs/weed/util"
-	"strconv"
-
-	"github.com/chrislusf/seaweedfs/weed/glog"
-	"github.com/chrislusf/seaweedfs/weed/storage"
 )
 
 type DataNode struct {
@@ -18,6 +16,7 @@ type DataNode struct {
 	Port      int
 	PublicUrl string
 	LastSeen  int64 // unix time in seconds
+	Counter   int   // in race condition, the previous dataNode was not dead
 }
 
 func NewDataNode(id string) *DataNode {
@@ -206,7 +205,7 @@ func (dn *DataNode) MatchLocation(ip string, port int) bool {
 }
 
 func (dn *DataNode) Url() string {
-	return dn.Ip + ":" + strconv.Itoa(dn.Port)
+	return util.JoinHostPort(dn.Ip, dn.Port)
 }
 
 func (dn *DataNode) ToMap() interface{} {
diff --git a/weed/topology/rack.go b/weed/topology/rack.go
index 8eb2a717c..9c77285c3 100644
--- a/weed/topology/rack.go
+++ b/weed/topology/rack.go
@@ -3,7 +3,7 @@ package topology
 import (
 	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
 	"github.com/chrislusf/seaweedfs/weed/storage/types"
-	"strconv"
+	"github.com/chrislusf/seaweedfs/weed/util"
 	"time"
 )
 
@@ -38,7 +38,7 @@ func (r *Rack) GetOrCreateDataNode(ip string, port int, publicUrl string, maxVol
 			return dn
 		}
 	}
-	dn := NewDataNode(ip + ":" + strconv.Itoa(port))
+	dn := NewDataNode(util.JoinHostPort(ip, port))
 	dn.Ip = ip
 	dn.Port = port
 	dn.PublicUrl = publicUrl
diff --git a/weed/topology/store_replicate.go b/weed/topology/store_replicate.go
index b114b468d..85c3a48ab 100644
--- a/weed/topology/store_replicate.go
+++ b/weed/topology/store_replicate.go
@@ -83,7 +83,16 @@ func ReplicatedWrite(masterFn operation.GetMasterFn, grpcDialOption grpc.DialOpt
 
 			// volume server do not know about encryption
 			// TODO optimize here to compress data only once
-			_, err := operation.UploadData(u.String(), string(n.Name), false, n.Data, n.IsCompressed(), string(n.Mime), pairMap, jwt)
+			uploadOption := &operation.UploadOption{
+				UploadUrl:         u.String(),
+				Filename:          string(n.Name),
+				Cipher:            false,
+				IsInputCompressed: n.IsCompressed(),
+				MimeType:          string(n.Mime),
+				PairMap:           pairMap,
+				Jwt:               jwt,
+			}
+			_, err := operation.UploadData(n.Data, uploadOption)
 			return err
 		}); err != nil {
 			err = fmt.Errorf("failed to write to replicas for volume %d: %v", volumeId, err)
@@ -170,7 +179,7 @@ func getWritableRemoteReplications(s *storage.Store, grpcDialOption grpc.DialOpt
 	// not on local store, or has replications
 	lookupResult, lookupErr := operation.LookupVolumeId(masterFn, grpcDialOption, volumeId.String())
 	if lookupErr == nil {
-		selfUrl := s.Ip + ":" + strconv.Itoa(s.Port)
+		selfUrl := util.JoinHostPort(s.Ip, s.Port)
 		for _, location := range lookupResult.Locations {
 			if location.Url != selfUrl {
 				remoteLocations = append(remoteLocations, location)
diff --git a/weed/topology/topology.go b/weed/topology/topology.go
index 4cbe22a42..39fc7dcad 100644
--- a/weed/topology/topology.go
+++ b/weed/topology/topology.go
@@ -136,7 +136,7 @@ func (t *Topology) HasWritableVolume(option *VolumeGrowOption) bool {
 	return active > 0
 }
 
-func (t *Topology) PickForWrite(count uint64, option *VolumeGrowOption) (string, uint64, *DataNode, error) {
+func (t *Topology) PickForWrite(count uint64, option *VolumeGrowOption) (string, uint64, *VolumeLocationList, error) {
 	vid, count, datanodes, err := t.GetVolumeLayout(option.Collection, option.ReplicaPlacement, option.Ttl, option.DiskType).PickForWrite(count, option)
 	if err != nil {
 		return "", 0, nil, fmt.Errorf("failed to find writable volumes for collection:%s replication:%s ttl:%s error: %v", option.Collection, option.ReplicaPlacement.String(), option.Ttl.String(), err)
@@ -145,7 +145,7 @@ func (t *Topology) PickForWrite(count uint64, option *VolumeGrowOption) (string,
 		return "", 0, nil, fmt.Errorf("no writable volumes available for collection:%s replication:%s ttl:%s", option.Collection, option.ReplicaPlacement.String(), option.Ttl.String())
 	}
 	fileId := t.Sequence.NextFileId(count)
-	return needle.NewFileId(*vid, fileId, rand.Uint32()).String(), count, datanodes.Head(), nil
+	return needle.NewFileId(*vid, fileId, rand.Uint32()).String(), count, datanodes, nil
 }
 
 func (t *Topology) GetVolumeLayout(collectionName string, rp *super_block.ReplicaPlacement, ttl *needle.TTL, diskType types.DiskType) *VolumeLayout {
diff --git a/weed/topology/volume_location_list.go b/weed/topology/volume_location_list.go
index 548c4cd25..03580ae5b 100644
--- a/weed/topology/volume_location_list.go
+++ b/weed/topology/volume_location_list.go
@@ -31,6 +31,11 @@ func (dnll *VolumeLocationList) Head() *DataNode {
 	return dnll.list[0]
 }
 
+func (dnll *VolumeLocationList) Rest() []*DataNode {
+	//mark first node as master volume
+	return dnll.list[1:]
+}
+
 func (dnll *VolumeLocationList) Length() int {
 	if dnll == nil {
 		return 0
diff --git a/weed/util/compression.go b/weed/util/compression.go
index 8699a8117..8158b9ba5 100644
--- a/weed/util/compression.go
+++ b/weed/util/compression.go
@@ -2,10 +2,7 @@ package util
 
 import (
 	"bytes"
-	"compress/flate"
-	"compress/gzip"
 	"fmt"
-	"io/ioutil"
 	"strings"
 
 	"github.com/chrislusf/seaweedfs/weed/glog"
@@ -42,17 +39,21 @@ func MaybeDecompressData(input []byte) []byte {
 }
 
 func GzipData(input []byte) ([]byte, error) {
-	buf := new(bytes.Buffer)
-	w, _ := gzip.NewWriterLevel(buf, flate.BestSpeed)
-	if _, err := w.Write(input); err != nil {
-		glog.V(2).Infof("error gzip data: %v", err)
+	w := new(bytes.Buffer)
+	_, err := GzipStream(w, bytes.NewReader(input))
+	if err != nil {
 		return nil, err
 	}
-	if err := w.Close(); err != nil {
-		glog.V(2).Infof("error closing gzipped data: %v", err)
+	return w.Bytes(), nil
+}
+
+func ungzipData(input []byte) ([]byte, error) {
+	w := new(bytes.Buffer)
+	_, err := GunzipStream(w, bytes.NewReader(input))
+	if err != nil {
 		return nil, err
 	}
-	return buf.Bytes(), nil
+	return w.Bytes(), nil
 }
 
 func DecompressData(input []byte) ([]byte, error) {
@@ -67,17 +68,6 @@ func DecompressData(input []byte) ([]byte, error) {
 	return input, UnsupportedCompression
 }
 
-func ungzipData(input []byte) ([]byte, error) {
-	buf := bytes.NewBuffer(input)
-	r, _ := gzip.NewReader(buf)
-	defer r.Close()
-	output, err := ioutil.ReadAll(r)
-	if err != nil {
-		glog.V(2).Infof("error ungzip data: %v", err)
-	}
-	return output, err
-}
-
 func IsGzippedContent(data []byte) bool {
 	if len(data) < 2 {
 		return false
diff --git a/weed/util/compression_stream.go b/weed/util/compression_stream.go
new file mode 100644
index 000000000..390100c80
--- /dev/null
+++ b/weed/util/compression_stream.go
@@ -0,0 +1,53 @@
+package util
+
+import (
+	"compress/gzip"
+	"fmt"
+	"io"
+	"sync"
+)
+
+var (
+	gzipReaderPool = sync.Pool{
+		New: func() interface{} {
+			return new(gzip.Reader)
+			//return gzip.NewReader()
+		},
+	}
+
+	gzipWriterPool = sync.Pool{
+		New: func() interface{} {
+			w, _ := gzip.NewWriterLevel(nil, gzip.BestSpeed)
+			return w
+		},
+	}
+)
+
+func GzipStream(w io.Writer, r io.Reader) (int64, error) {
+	gw, ok := gzipWriterPool.Get().(*gzip.Writer)
+	if !ok {
+		return 0, fmt.Errorf("gzip: new writer error")
+	}
+	gw.Reset(w)
+	defer func() {
+		gw.Close()
+		gzipWriterPool.Put(gw)
+	}()
+	return io.Copy(gw, r)
+}
+
+func GunzipStream(w io.Writer, r io.Reader) (int64, error) {
+	gr, ok := gzipReaderPool.Get().(*gzip.Reader)
+	if !ok {
+		return 0, fmt.Errorf("gzip: new reader error")
+	}
+
+	if err := gr.Reset(r); err != nil {
+		return 0, err
+	}
+	defer func() {
+		gr.Close()
+		gzipReaderPool.Put(gr)
+	}()
+	return io.Copy(w, gr)
+}
diff --git a/weed/util/compression_test.go b/weed/util/compression_test.go
deleted file mode 100644
index b515e8988..000000000
--- a/weed/util/compression_test.go
+++ /dev/null
@@ -1,21 +0,0 @@
-package util
-
-import (
-	"testing"
-
-	"golang.org/x/tools/godoc/util"
-)
-
-func TestIsGzippable(t *testing.T) {
-	buf := make([]byte, 1024)
-
-	isText := util.IsText(buf)
-
-	if isText {
-		t.Error("buf with zeros are not text")
-	}
-
-	compressed, _ := GzipData(buf)
-
-	t.Logf("compressed size %d\n", len(compressed))
-}
diff --git a/weed/util/constants.go b/weed/util/constants.go
index c16df39fc..852284e16 100644
--- a/weed/util/constants.go
+++ b/weed/util/constants.go
@@ -5,8 +5,9 @@ import (
 )
 
 var (
-	VERSION = fmt.Sprintf("%s %.02f", sizeLimit, 2.62)
-	COMMIT  = ""
+	VERSION_NUMBER = fmt.Sprintf("%.02f", 2.67)
+	VERSION        = sizeLimit + " " + VERSION_NUMBER
+	COMMIT         = ""
 )
 
 func Version() string {
diff --git a/weed/util/constants_4bytes.go b/weed/util/constants_4bytes.go
index a29d9d3b0..187e33909 100644
--- a/weed/util/constants_4bytes.go
+++ b/weed/util/constants_4bytes.go
@@ -1,3 +1,4 @@
+//go:build !5BytesOffset
 // +build !5BytesOffset
 
 package util
diff --git a/weed/util/constants_5bytes.go b/weed/util/constants_5bytes.go
index 91ce4066f..7c6a158cf 100644
--- a/weed/util/constants_5bytes.go
+++ b/weed/util/constants_5bytes.go
@@ -1,3 +1,4 @@
+//go:build 5BytesOffset
 // +build 5BytesOffset
 
 package util
diff --git a/weed/util/file_util_non_posix.go b/weed/util/file_util_non_posix.go
index ffcfef6d5..29aecffa6 100644
--- a/weed/util/file_util_non_posix.go
+++ b/weed/util/file_util_non_posix.go
@@ -1,3 +1,4 @@
+//go:build linux || darwin || freebsd || netbsd || openbsd || plan9 || solaris || zos
 // +build linux darwin freebsd netbsd openbsd plan9 solaris zos
 
 package util
diff --git a/weed/util/file_util_posix.go b/weed/util/file_util_posix.go
index 22ca60b3b..0bec8abad 100644
--- a/weed/util/file_util_posix.go
+++ b/weed/util/file_util_posix.go
@@ -1,3 +1,4 @@
+//go:build windows
 // +build windows
 
 package util
diff --git a/weed/util/grace/signal_handling.go b/weed/util/grace/signal_handling.go
index 7cca46764..fc7afcad9 100644
--- a/weed/util/grace/signal_handling.go
+++ b/weed/util/grace/signal_handling.go
@@ -1,3 +1,4 @@
+//go:build !plan9
 // +build !plan9
 
 package grace
diff --git a/weed/util/grace/signal_handling_notsupported.go b/weed/util/grace/signal_handling_notsupported.go
index 5335915a1..de898159a 100644
--- a/weed/util/grace/signal_handling_notsupported.go
+++ b/weed/util/grace/signal_handling_notsupported.go
@@ -1,3 +1,4 @@
+//go:build plan9
 // +build plan9
 
 package grace
diff --git a/weed/util/network.go b/weed/util/network.go
index 55a123667..43b4a794d 100644
--- a/weed/util/network.go
+++ b/weed/util/network.go
@@ -2,6 +2,8 @@ package util
 
 import (
 	"net"
+	"strconv"
+	"strings"
 
 	"github.com/chrislusf/seaweedfs/weed/glog"
 )
@@ -13,6 +15,18 @@ func DetectedHostAddress() string {
 		return ""
 	}
 
+	if v4Address := selectIpV4(netInterfaces, true); v4Address != ""{
+		return v4Address
+	}
+
+	if v6Address := selectIpV4(netInterfaces, false); v6Address != ""{
+		return v6Address
+	}
+
+	return "localhost"
+}
+
+func selectIpV4(netInterfaces []net.Interface, isIpV4 bool) string {
 	for _, netInterface := range netInterfaces {
 		if (netInterface.Flags & net.FlagUp) == 0 {
 			continue
@@ -24,12 +38,25 @@ func DetectedHostAddress() string {
 
 		for _, a := range addrs {
 			if ipNet, ok := a.(*net.IPNet); ok && !ipNet.IP.IsLoopback() {
-				if ipNet.IP.To4() != nil {
-					return ipNet.IP.String()
+				if isIpV4 {
+					if ipNet.IP.To4() != nil {
+						return ipNet.IP.String()
+					}
+				} else {
+					if ipNet.IP.To16() != nil {
+						return ipNet.IP.String()
+					}
 				}
 			}
 		}
 	}
-
-	return "localhost"
+	return ""
 }
+
+func JoinHostPort(host string, port int) string {
+	portStr := strconv.Itoa(port)
+	if strings.HasPrefix(host, "[") && strings.HasSuffix(host, "]") {
+		return host + ":" + portStr
+	}
+	return net.JoinHostPort(host, portStr)
+}
\ No newline at end of file
diff --git a/weed/util/retry.go b/weed/util/retry.go
index 7b0f2d3c3..b7cd278b3 100644
--- a/weed/util/retry.go
+++ b/weed/util/retry.go
@@ -32,6 +32,27 @@ func Retry(name string, job func() error) (err error) {
 	return err
 }
 
+func RetryForever(name string, job func() error, onErrFn func(err error) bool) {
+	waitTime := time.Second
+	for {
+		err := job()
+		if err == nil {
+			waitTime = time.Second
+			break
+		}
+		if onErrFn(err) {
+			if strings.Contains(err.Error(), "transport") {
+				glog.V(0).Infof("retry %s: err: %v", name, err)
+			}
+			time.Sleep(waitTime)
+			if waitTime < RetryWaitTime {
+				waitTime += waitTime / 2
+			}
+			continue
+		}
+	}
+}
+
 // return the first non empty string
 func Nvl(values ...string) string {
 	for _, s := range values {
diff --git a/weed/wdclient/net2/ip.go b/weed/wdclient/net2/ip.go
deleted file mode 100644
index ff5e3b24e..000000000
--- a/weed/wdclient/net2/ip.go
+++ /dev/null
@@ -1,177 +0,0 @@
-package net2
-
-import (
-	"fmt"
-	"log"
-	"net"
-	"os"
-	"strings"
-	"sync"
-)
-
-var myHostname string
-var myHostnameOnce sync.Once
-
-// Like os.Hostname but caches first successful result, making it cheap to call it
-// over and over.
-// It will also crash whole process if fetching Hostname fails!
-func MyHostname() string {
-	myHostnameOnce.Do(func() {
-		var err error
-		myHostname, err = os.Hostname()
-		if err != nil {
-			log.Fatal(err)
-		}
-	})
-	return myHostname
-}
-
-var myIp4 *net.IPAddr
-var myIp4Once sync.Once
-
-// Resolves `MyHostname()` to an Ip4 address. Caches first successful result, making it
-// cheap to call it over and over.
-// It will also crash whole process if resolving the IP fails!
-func MyIp4() *net.IPAddr {
-	myIp4Once.Do(func() {
-		var err error
-		myIp4, err = net.ResolveIPAddr("ip4", MyHostname())
-		if err != nil {
-			log.Fatal(err)
-		}
-	})
-	return myIp4
-}
-
-var myIp6 *net.IPAddr
-var myIp6Once sync.Once
-
-// Resolves `MyHostname()` to an Ip6 address. Caches first successful result, making it
-// cheap to call it over and over.
-// It will also crash whole process if resolving the IP fails!
-func MyIp6() *net.IPAddr {
-	myIp6Once.Do(func() {
-		var err error
-		myIp6, err = net.ResolveIPAddr("ip6", MyHostname())
-		if err != nil {
-			log.Fatal(err)
-		}
-	})
-	return myIp6
-}
-
-// This returns the list of local ip addresses which other hosts can connect
-// to (NOTE: Loopback ip is ignored).
-// Also resolves Hostname to an address and adds it to the list too, so
-// IPs from /etc/hosts can work too.
-func GetLocalIPs() ([]*net.IP, error) {
-	hostname, err := os.Hostname()
-	if err != nil {
-		return nil, fmt.Errorf("Failed to lookup hostname: %v", err)
-	}
-	// Resolves IP Address from Hostname, this way overrides in /etc/hosts
-	// can work too for IP resolution.
-	ipInfo, err := net.ResolveIPAddr("ip4", hostname)
-	if err != nil {
-		return nil, fmt.Errorf("Failed to resolve ip: %v", err)
-	}
-	ips := []*net.IP{&ipInfo.IP}
-
-	// TODO(zviad): Is rest of the code really necessary?
-	addrs, err := net.InterfaceAddrs()
-	if err != nil {
-		return nil, fmt.Errorf("Failed to get interface addresses: %v", err)
-	}
-	for _, addr := range addrs {
-		ipnet, ok := addr.(*net.IPNet)
-		if !ok {
-			continue
-		}
-
-		if ipnet.IP.IsLoopback() {
-			continue
-		}
-
-		ips = append(ips, &ipnet.IP)
-	}
-	return ips, nil
-}
-
-var localhostIPNets []*net.IPNet
-
-func init() {
-	for _, mask := range []string{"127.0.0.1/8", "::1/128"} {
-		_, ipnet, err := net.ParseCIDR(mask)
-		if err != nil {
-			panic(err)
-		}
-		localhostIPNets = append(localhostIPNets, ipnet)
-	}
-}
-
-func IsLocalhostIp(ipStr string) bool {
-	ip := net.ParseIP(ipStr)
-	if ip == nil {
-		return false
-	}
-	for _, ipnet := range localhostIPNets {
-		if ipnet.Contains(ip) {
-			return true
-		}
-	}
-	return false
-}
-
-// Given a host string, return true if the host is an ip (v4/v6) localhost.
-func IsLocalhost(host string) bool {
-	return IsLocalhostIp(host) ||
-		host == "localhost" ||
-		host == "ip6-localhost" ||
-		host == "ipv6-localhost"
-}
-
-// Resolves hostnames in addresses to actual IP4 addresses. Skips all invalid addresses
-// and all addresses that can't be resolved.
-// `addrs` are assumed to be of form: ["<hostname>:<port>", ...]
-// Returns an error in addition to resolved addresses if not all resolutions succeed.
-func ResolveIP4s(addrs []string) ([]string, error) {
-	resolvedAddrs := make([]string, 0, len(addrs))
-	var lastErr error
-
-	for _, server := range addrs {
-		hostPort := strings.Split(server, ":")
-		if len(hostPort) != 2 {
-			lastErr = fmt.Errorf("Skipping invalid address: %s", server)
-			continue
-		}
-
-		ip, err := net.ResolveIPAddr("ip4", hostPort[0])
-		if err != nil {
-			lastErr = err
-			continue
-		}
-		resolvedAddrs = append(resolvedAddrs, ip.IP.String()+":"+hostPort[1])
-	}
-	return resolvedAddrs, lastErr
-}
-
-func LookupValidAddrs() (map[string]bool, error) {
-	hostName, err := os.Hostname()
-	if err != nil {
-		return nil, err
-	}
-	addrs, err := net.LookupHost(hostName)
-	if err != nil {
-		return nil, err
-	}
-	validAddrs := make(map[string]bool)
-	validAddrs[hostName] = true
-	for _, addr := range addrs {
-		validAddrs[addr] = true
-	}
-	// Special case localhost/127.0.0.1 so that this works on devVMs. It should
-	// have no affect in production.
-	validAddrs["127.0.0.1"] = true
-	validAddrs["localhost"] = true
-	return validAddrs, nil
-}