Merge pull request #23 from chrislusf/master

sync

58 files changed, 1137 insertions, 478 deletions

diff --git a/weed/command/benchmark.go b/weed/command/benchmark.go
index 4a9a9619a..8bb585d91 100644
--- a/weed/command/benchmark.go
+++ b/weed/command/benchmark.go
@@ -282,14 +282,19 @@ func readFiles(fileIdLineChan chan string, s *stat) {
 		start := time.Now()
 		var bytesRead int
 		var err error
-		url, err := b.masterClient.LookupFileId(fid)
+		urls, err := b.masterClient.LookupFileId(fid)
 		if err != nil {
 			s.failed++
 			println("!!!! ", fid, " location not found!!!!!")
 			continue
 		}
 		var bytes []byte
-		bytes, err = util.Get(url)
+		for _, url := range urls {
+			bytes, err = util.Get(url)
+			if err == nil {
+				break
+			}
+		}
 		bytesRead = len(bytes)
 		if err == nil {
 			s.completed++
diff --git a/weed/command/filer.go b/weed/command/filer.go
index 7ff9fcd9a..e885eafc4 100644
--- a/weed/command/filer.go
+++ b/weed/command/filer.go
@@ -1,6 +1,7 @@
 package command
 
 import (
+	"fmt"
 	"net/http"
 	"strconv"
 	"strings"
@@ -18,7 +19,9 @@ import (
 )
 
 var (
-	f FilerOptions
+	f              FilerOptions
+	filerStartS3   *bool
+	filerS3Options S3Options
 )
 
 type FilerOptions struct {
@@ -51,7 +54,7 @@ func init() {
 	f.bindIp = cmdFiler.Flag.String("ip.bind", "0.0.0.0", "ip address to bind to")
 	f.port = cmdFiler.Flag.Int("port", 8888, "filer server http listen port")
 	f.publicPort = cmdFiler.Flag.Int("port.readonly", 0, "readonly port opened to public")
-	f.defaultReplicaPlacement = cmdFiler.Flag.String("defaultReplicaPlacement", "000", "default replication type if not specified")
+	f.defaultReplicaPlacement = cmdFiler.Flag.String("defaultReplicaPlacement", "", "default replication type. If not specified, use master setting.")
 	f.disableDirListing = cmdFiler.Flag.Bool("disableDirListing", false, "turn off directory listing")
 	f.maxMB = cmdFiler.Flag.Int("maxMB", 32, "split files larger than the limit")
 	f.dirListingLimit = cmdFiler.Flag.Int("dirListLimit", 100000, "limit sub dir listing size")
@@ -60,6 +63,14 @@ func init() {
 	f.cipher = cmdFiler.Flag.Bool("encryptVolumeData", false, "encrypt data on volume servers")
 	f.peers = cmdFiler.Flag.String("peers", "", "all filers sharing the same filer store in comma separated ip:port list")
 	f.metricsHttpPort = cmdFiler.Flag.Int("metricsPort", 0, "Prometheus metrics listen port")
+
+	// start s3 on filer
+	filerStartS3 = cmdFiler.Flag.Bool("s3", false, "whether to start S3 gateway")
+	filerS3Options.port = cmdFiler.Flag.Int("s3.port", 8333, "s3 server http listen port")
+	filerS3Options.domainName = cmdFiler.Flag.String("s3.domainName", "", "suffix of the host name, {bucket}.{domainName}")
+	filerS3Options.tlsPrivateKey = cmdFiler.Flag.String("s3.key.file", "", "path to the TLS private key file")
+	filerS3Options.tlsCertificate = cmdFiler.Flag.String("s3.cert.file", "", "path to the TLS certificate file")
+	filerS3Options.config = cmdFiler.Flag.String("s3.config", "", "path to the config file")
 }
 
 var cmdFiler = &Command{
@@ -89,6 +100,15 @@ func runFiler(cmd *Command, args []string) bool {
 
 	go stats_collect.StartMetricsServer(*f.metricsHttpPort)
 
+	if *filerStartS3 {
+		filerAddress := fmt.Sprintf("%s:%d", *f.ip, *f.port)
+		filerS3Options.filer = &filerAddress
+		go func() {
+			time.Sleep(2 * time.Second)
+			filerS3Options.startS3Server()
+		}()
+	}
+
 	f.startFiler()
 
 	return true
diff --git a/weed/command/master.go b/weed/command/master.go
index 144962f63..bf5f83875 100644
--- a/weed/command/master.go
+++ b/weed/command/master.go
@@ -1,15 +1,16 @@
 package command
 
 import (
+	"github.com/chrislusf/raft/protobuf"
+	"github.com/gorilla/mux"
+	"google.golang.org/grpc/reflection"
 	"net/http"
 	"os"
 	"runtime"
+	"sort"
 	"strconv"
 	"strings"
-
-	"github.com/chrislusf/raft/protobuf"
-	"github.com/gorilla/mux"
-	"google.golang.org/grpc/reflection"
+	"time"
 
 	"github.com/chrislusf/seaweedfs/weed/util/grace"
 
@@ -41,6 +42,7 @@ type MasterOptions struct {
 	disableHttp        *bool
 	metricsAddress     *string
 	metricsIntervalSec *int
+	raftResumeState    *bool
 }
 
 func init() {
@@ -59,6 +61,7 @@ func init() {
 	m.disableHttp = cmdMaster.Flag.Bool("disableHttp", false, "disable http requests, only gRPC operations are allowed.")
 	m.metricsAddress = cmdMaster.Flag.String("metrics.address", "", "Prometheus gateway address <host>:<port>")
 	m.metricsIntervalSec = cmdMaster.Flag.Int("metrics.intervalSeconds", 15, "Prometheus push interval in seconds")
+	m.raftResumeState = cmdMaster.Flag.Bool("resumeState", false, "resume previous state on start master server")
 }
 
 var cmdMaster = &Command{
@@ -118,10 +121,10 @@ func startMaster(masterOption MasterOptions, masterWhiteList []string) {
 		glog.Fatalf("Master startup error: %v", e)
 	}
 	// start raftServer
-	raftServer := weed_server.NewRaftServer(security.LoadClientTLS(util.GetViper(), "grpc.master"),
-		peers, myMasterAddress, util.ResolvePath(*masterOption.metaFolder), ms.Topo, 5)
+	raftServer, err := weed_server.NewRaftServer(security.LoadClientTLS(util.GetViper(), "grpc.master"),
+		peers, myMasterAddress, util.ResolvePath(*masterOption.metaFolder), ms.Topo, 5, *masterOption.raftResumeState)
 	if raftServer == nil {
-		glog.Fatalf("please verify %s is writable, see https://github.com/chrislusf/seaweedfs/issues/717", *masterOption.metaFolder)
+		glog.Fatalf("please verify %s is writable, see https://github.com/chrislusf/seaweedfs/issues/717: %s", *masterOption.metaFolder, err)
 	}
 	ms.SetRaftServer(raftServer)
 	r.HandleFunc("/cluster/status", raftServer.StatusHandler).Methods("GET")
@@ -139,6 +142,15 @@ func startMaster(masterOption MasterOptions, masterWhiteList []string) {
 	glog.V(0).Infof("Start Seaweed Master %s grpc server at %s:%d", util.Version(), *masterOption.ipBind, grpcPort)
 	go grpcS.Serve(grpcL)
 
+	go func() {
+		time.Sleep(1500 * time.Millisecond)
+		if ms.Topo.RaftServer.Leader() == "" && ms.Topo.RaftServer.IsLogEmpty() && isTheFirstOne(myMasterAddress, peers) {
+			if ms.MasterClient.FindLeader(myMasterAddress) == "" {
+				raftServer.DoJoinCommand()
+			}
+		}
+	}()
+
 	go ms.MasterClient.KeepConnectedToMaster()
 
 	// start http server
@@ -172,6 +184,14 @@ func checkPeers(masterIp string, masterPort int, peers string) (masterAddress st
 	return
 }
 
+func isTheFirstOne(self string, peers []string) bool {
+	sort.Strings(peers)
+	if len(peers) <= 0 {
+		return true
+	}
+	return self == peers[0]
+}
+
 func (m *MasterOptions) toMasterOption(whiteList []string) *weed_server.MasterOption {
 	return &weed_server.MasterOption{
 		Host:              *m.ip,
diff --git a/weed/command/mount_std.go b/weed/command/mount_std.go
index 7c0f56d3a..14374eb5c 100644
--- a/weed/command/mount_std.go
+++ b/weed/command/mount_std.go
@@ -7,6 +7,7 @@ import (
 	"fmt"
 	"github.com/chrislusf/seaweedfs/weed/filesys/meta_cache"
 	"os"
+	"os/user"
 	"path"
 	"runtime"
 	"strconv"
@@ -92,6 +93,29 @@ func RunMount(option *MountOptions, umask os.FileMode) bool {
 	}
 	fileInfo, err := os.Stat(dir)
 
+	uid, gid := uint32(0), uint32(0)
+	mountMode := os.ModeDir | 0777
+	if err == nil {
+		mountMode = os.ModeDir | fileInfo.Mode()
+		uid, gid = util.GetFileUidGid(fileInfo)
+		fmt.Printf("mount point owner uid=%d gid=%d mode=%s\n", uid, gid, fileInfo.Mode())
+	} else {
+		fmt.Printf("can not stat %s\n", dir)
+		return false
+	}
+
+	if uid == 0 {
+		if u, err := user.Current(); err == nil {
+			if parsedId, pe := strconv.ParseUint(u.Uid, 10, 32); pe == nil {
+				uid = uint32(parsedId)
+			}
+			if parsedId, pe := strconv.ParseUint(u.Gid, 10, 32); pe == nil {
+				gid = uint32(parsedId)
+			}
+			fmt.Printf("current uid=%d gid=%d\n", uid, gid)
+		}
+	}
+
 	// mapping uid, gid
 	uidGidMapper, err := meta_cache.NewUidGidMapper(*option.uidMap, *option.gidMap)
 	if err != nil {
@@ -150,6 +174,9 @@ func RunMount(option *MountOptions, umask os.FileMode) bool {
 		CacheSizeMB:                 *option.cacheSizeMB,
 		DataCenter:                  *option.dataCenter,
 		EntryCacheTtl:               3 * time.Second,
+		MountUid:                    uid,
+		MountGid:                    gid,
+		MountMode:                   mountMode,
 		MountCtime:                  fileInfo.ModTime(),
 		MountMtime:                  time.Now(),
 		Umask:                       umask,
diff --git a/weed/command/s3.go b/weed/command/s3.go
index e94decaf3..7d0954c0c 100644
--- a/weed/command/s3.go
+++ b/weed/command/s3.go
@@ -54,7 +54,13 @@ var cmdS3 = &Command{
 {
   "identities": [
     {
-      "name": "some_name",
+      "name": "anonymous",
+      "actions": [
+        "Read"
+      ]
+    },
+    {
+      "name": "some_admin_user",
       "credentials": [
         {
           "accessKey": "some_access_key1",
@@ -64,6 +70,8 @@ var cmdS3 = &Command{
       "actions": [
         "Admin",
         "Read",
+        "List",
+        "Tagging",
         "Write"
       ]
     },
@@ -89,6 +97,8 @@ var cmdS3 = &Command{
       ],
       "actions": [
         "Read",
+        "List",
+        "Tagging",
         "Write"
       ]
     },
@@ -102,6 +112,8 @@ var cmdS3 = &Command{
       ],
       "actions": [
         "Read:bucket1",
+        "List:bucket1",
+        "Tagging:bucket1",
         "Write:bucket1"
       ]
     }
diff --git a/weed/command/scaffold.go b/weed/command/scaffold.go
index dd12f12a2..c36e4a25f 100644
--- a/weed/command/scaffold.go
+++ b/weed/command/scaffold.go
@@ -140,6 +140,8 @@ keyspace="seaweedfs"
 hosts=[
 	"localhost:9042",
 ]
+username=""
+password=""
 
 [redis2]
 enabled = false
diff --git a/weed/command/server.go b/weed/command/server.go
index 91d8d22c6..80fb14600 100644
--- a/weed/command/server.go
+++ b/weed/command/server.go
@@ -81,11 +81,12 @@ func init() {
 	masterOptions.garbageThreshold = cmdServer.Flag.Float64("garbageThreshold", 0.3, "threshold to vacuum and reclaim spaces")
 	masterOptions.metricsAddress = cmdServer.Flag.String("metrics.address", "", "Prometheus gateway address")
 	masterOptions.metricsIntervalSec = cmdServer.Flag.Int("metrics.intervalSeconds", 15, "Prometheus push interval in seconds")
+	masterOptions.raftResumeState = cmdServer.Flag.Bool("resumeState", false, "resume previous state on start master server")
 
 	filerOptions.collection = cmdServer.Flag.String("filer.collection", "", "all data will be stored in this collection")
 	filerOptions.port = cmdServer.Flag.Int("filer.port", 8888, "filer server http listen port")
 	filerOptions.publicPort = cmdServer.Flag.Int("filer.port.public", 0, "filer server public http listen port")
-	filerOptions.defaultReplicaPlacement = cmdServer.Flag.String("filer.defaultReplicaPlacement", "", "Default replication type if not specified during runtime.")
+	filerOptions.defaultReplicaPlacement = cmdServer.Flag.String("filer.defaultReplicaPlacement", "", "default replication type. If not specified, use master setting.")
 	filerOptions.disableDirListing = cmdServer.Flag.Bool("filer.disableDirListing", false, "turn off directory listing")
 	filerOptions.maxMB = cmdServer.Flag.Int("filer.maxMB", 32, "split files larger than the limit")
 	filerOptions.dirListingLimit = cmdServer.Flag.Int("filer.dirListLimit", 1000, "limit sub dir listing size")
@@ -165,10 +166,6 @@ func runServer(cmd *Command, args []string) bool {
 	s3Options.filer = &filerAddress
 	msgBrokerOptions.filer = &filerAddress
 
-	if *filerOptions.defaultReplicaPlacement == "" {
-		*filerOptions.defaultReplicaPlacement = *masterOptions.defaultReplication
-	}
-
 	runtime.GOMAXPROCS(runtime.NumCPU())
 	go stats_collect.StartMetricsServer(*serverMetricsHttpPort)
 
diff --git a/weed/command/volume.go b/weed/command/volume.go
index dfc649ba5..d73c24ed1 100644
--- a/weed/command/volume.go
+++ b/weed/command/volume.go
@@ -138,6 +138,11 @@ func (v VolumeServerOptions) startVolumeServer(volumeFolders, maxVolumeCounts, v
 			glog.Fatalf("The max specified in -max not a valid number %s", maxString)
 		}
 	}
+	if len(v.folderMaxLimits) == 1 && len(v.folders) > 1 {
+		for i := 0; i < len(v.folders)-1; i++ {
+			v.folderMaxLimits = append(v.folderMaxLimits, v.folderMaxLimits[0])
+		}
+	}
 	if len(v.folders) != len(v.folderMaxLimits) {
 		glog.Fatalf("%d directories by -dir, but only %d max is set by -max", len(v.folders), len(v.folderMaxLimits))
 	}
diff --git a/weed/filer/filechunk_manifest.go b/weed/filer/filechunk_manifest.go
index 37b172357..9e53e008f 100644
--- a/weed/filer/filechunk_manifest.go
+++ b/weed/filer/filechunk_manifest.go
@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"io"
 	"math"
+	"time"
 
 	"github.com/golang/protobuf/proto"
 
@@ -84,21 +85,40 @@ func ResolveOneChunkManifest(lookupFileIdFn LookupFileIdFunctionType, chunk *fil
 
 // TODO fetch from cache for weed mount?
 func fetchChunk(lookupFileIdFn LookupFileIdFunctionType, fileId string, cipherKey []byte, isGzipped bool) ([]byte, error) {
-	urlString, err := lookupFileIdFn(fileId)
+	urlStrings, err := lookupFileIdFn(fileId)
 	if err != nil {
 		glog.Errorf("operation LookupFileId %s failed, err: %v", fileId, err)
 		return nil, err
 	}
+	return retriedFetchChunkData(urlStrings, cipherKey, isGzipped, true, 0, 0)
+}
+
+func retriedFetchChunkData(urlStrings []string, cipherKey []byte, isGzipped bool, isFullChunk bool, offset int64, size int) ([]byte, error) {
+
+	var err error
 	var buffer bytes.Buffer
-	err = util.ReadUrlAsStream(urlString, cipherKey, isGzipped, true, 0, 0, func(data []byte) {
-		buffer.Write(data)
-	})
-	if err != nil {
-		glog.V(0).Infof("read %s failed, err: %v", fileId, err)
-		return nil, err
+
+	for waitTime := time.Second; waitTime < 10*time.Second; waitTime += waitTime / 2 {
+		for _, urlString := range urlStrings {
+			err = util.ReadUrlAsStream(urlString, cipherKey, isGzipped, isFullChunk, offset, size, func(data []byte) {
+				buffer.Write(data)
+			})
+			if err != nil {
+				glog.V(0).Infof("read %s failed, err: %v", urlString, err)
+				buffer.Reset()
+			} else {
+				break
+			}
+		}
+		if err != nil {
+			glog.V(0).Infof("sleep for %v before retrying reading", waitTime)
+			time.Sleep(waitTime)
+		} else {
+			break
+		}
 	}
 
-	return buffer.Bytes(), nil
+	return buffer.Bytes(), err
 }
 
 func MaybeManifestize(saveFunc SaveDataAsChunkFunctionType, inputChunks []*filer_pb.FileChunk) (chunks []*filer_pb.FileChunk, err error) {
diff --git a/weed/filer/filechunks.go b/weed/filer/filechunks.go
index db55eec00..c75a35f79 100644
--- a/weed/filer/filechunks.go
+++ b/weed/filer/filechunks.go
@@ -1,13 +1,15 @@
 package filer
 
 import (
+	"bytes"
+	"encoding/hex"
 	"fmt"
-	"hash/fnv"
 	"math"
 	"sort"
 	"sync"
 
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/util"
 )
 
 func TotalSize(chunks []*filer_pb.FileChunk) (size uint64) {
@@ -42,12 +44,12 @@ func ETagChunks(chunks []*filer_pb.FileChunk) (etag string) {
 	if len(chunks) == 1 {
 		return chunks[0].ETag
 	}
-
-	h := fnv.New32a()
+	md5_digests := [][]byte{}
 	for _, c := range chunks {
-		h.Write([]byte(c.ETag))
+		md5_decoded, _ := hex.DecodeString(c.ETag)
+		md5_digests = append(md5_digests, md5_decoded)
 	}
-	return fmt.Sprintf("%x", h.Sum32())
+	return fmt.Sprintf("%x-%d", util.Md5(bytes.Join(md5_digests, nil)), len(chunks))
 }
 
 func CompactFileChunks(lookupFileIdFn LookupFileIdFunctionType, chunks []*filer_pb.FileChunk) (compacted, garbage []*filer_pb.FileChunk) {
diff --git a/weed/filer/filer_delete_entry.go b/weed/filer/filer_delete_entry.go
index 6c9ff56d3..69219fbfa 100644
--- a/weed/filer/filer_delete_entry.go
+++ b/weed/filer/filer_delete_entry.go
@@ -77,7 +77,7 @@ func (f *Filer) doBatchDeleteFolderMetaAndData(ctx context.Context, entry *Entry
 		if lastFileName == "" && !isRecursive && len(entries) > 0 {
 			// only for first iteration in the loop
 			glog.Errorf("deleting a folder %s has children: %+v ...", entry.FullPath, entries[0].Name())
-			return nil, nil,fmt.Errorf("fail to delete non-empty folder: %s", entry.FullPath)
+			return nil, nil, fmt.Errorf("fail to delete non-empty folder: %s", entry.FullPath)
 		}
 
 		for _, sub := range entries {
diff --git a/weed/filer/reader_at.go b/weed/filer/reader_at.go
index 9f338782e..fa51df687 100644
--- a/weed/filer/reader_at.go
+++ b/weed/filer/reader_at.go
@@ -3,52 +3,72 @@ package filer
 import (
 	"context"
 	"fmt"
-	"io"
-	"sync"
-
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
 	"github.com/chrislusf/seaweedfs/weed/util/chunk_cache"
 	"github.com/chrislusf/seaweedfs/weed/wdclient"
+	"github.com/golang/groupcache/singleflight"
+	"io"
+	"math/rand"
+	"sync"
 )
 
 type ChunkReadAt struct {
 	masterClient *wdclient.MasterClient
 	chunkViews   []*ChunkView
-	lookupFileId func(fileId string) (targetUrl string, err error)
+	lookupFileId LookupFileIdFunctionType
 	readerLock   sync.Mutex
 	fileSize     int64
 
-	chunkCache chunk_cache.ChunkCache
+	fetchGroup      singleflight.Group
+	lastChunkFileId string
+	lastChunkData   []byte
+	chunkCache      chunk_cache.ChunkCache
 }
 
 // var _ = io.ReaderAt(&ChunkReadAt{})
 
-type LookupFileIdFunctionType func(fileId string) (targetUrl string, err error)
+type LookupFileIdFunctionType func(fileId string) (targetUrls []string, err error)
 
 func LookupFn(filerClient filer_pb.FilerClient) LookupFileIdFunctionType {
-	return func(fileId string) (targetUrl string, err error) {
-		err = filerClient.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
-			vid := VolumeId(fileId)
-			resp, err := client.LookupVolume(context.Background(), &filer_pb.LookupVolumeRequest{
-				VolumeIds: []string{vid},
-			})
-			if err != nil {
-				return err
-			}
 
-			locations := resp.LocationsMap[vid]
-			if locations == nil || len(locations.Locations) == 0 {
-				glog.V(0).Infof("failed to locate %s", fileId)
-				return fmt.Errorf("failed to locate %s", fileId)
-			}
+	vidCache := make(map[string]*filer_pb.Locations)
+	return func(fileId string) (targetUrls []string, err error) {
+		vid := VolumeId(fileId)
+		locations, found := vidCache[vid]
+
+		if !found {
+			// println("looking up volume", vid)
+			err = filerClient.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
+				resp, err := client.LookupVolume(context.Background(), &filer_pb.LookupVolumeRequest{
+					VolumeIds: []string{vid},
+				})
+				if err != nil {
+					return err
+				}
+
+				locations = resp.LocationsMap[vid]
+				if locations == nil || len(locations.Locations) == 0 {
+					glog.V(0).Infof("failed to locate %s", fileId)
+					return fmt.Errorf("failed to locate %s", fileId)
+				}
+				vidCache[vid] = locations
+
+				return nil
+			})
+		}
 
-			volumeServerAddress := filerClient.AdjustedUrl(locations.Locations[0].Url)
+		for _, loc := range locations.Locations {
+			volumeServerAddress := filerClient.AdjustedUrl(loc.Url)
+			targetUrl := fmt.Sprintf("http://%s/%s", volumeServerAddress, fileId)
+			targetUrls = append(targetUrls, targetUrl)
+		}
 
-			targetUrl = fmt.Sprintf("http://%s/%s", volumeServerAddress, fileId)
+		for i := len(targetUrls) - 1; i > 0; i-- {
+			j := rand.Intn(i + 1)
+			targetUrls[i], targetUrls[j] = targetUrls[j], targetUrls[i]
+		}
 
-			return nil
-		})
 		return
 	}
 }
@@ -76,10 +96,16 @@ func (c *ChunkReadAt) doReadAt(p []byte, offset int64) (n int, err error) {
 
 	var buffer []byte
 	startOffset, remaining := offset, int64(len(p))
+	var nextChunk *ChunkView
 	for i, chunk := range c.chunkViews {
 		if remaining <= 0 {
 			break
 		}
+		if i+1 < len(c.chunkViews) {
+			nextChunk = c.chunkViews[i+1]
+		} else {
+			nextChunk = nil
+		}
 		if startOffset < chunk.LogicOffset {
 			gap := int(chunk.LogicOffset - startOffset)
 			glog.V(4).Infof("zero [%d,%d)", startOffset, startOffset+int64(gap))
@@ -95,7 +121,7 @@ func (c *ChunkReadAt) doReadAt(p []byte, offset int64) (n int, err error) {
 			continue
 		}
 		glog.V(4).Infof("read [%d,%d), %d/%d chunk %s [%d,%d)", chunkStart, chunkStop, i, len(c.chunkViews), chunk.FileId, chunk.LogicOffset-chunk.Offset, chunk.LogicOffset-chunk.Offset+int64(chunk.Size))
-		buffer, err = c.readFromWholeChunkData(chunk)
+		buffer, err = c.readFromWholeChunkData(chunk, nextChunk)
 		if err != nil {
 			glog.Errorf("fetching chunk %+v: %v\n", chunk, err)
 			return
@@ -123,27 +149,63 @@ func (c *ChunkReadAt) doReadAt(p []byte, offset int64) (n int, err error) {
 
 }
 
-func (c *ChunkReadAt) readFromWholeChunkData(chunkView *ChunkView) (chunkData []byte, err error) {
+func (c *ChunkReadAt) readFromWholeChunkData(chunkView *ChunkView, nextChunkViews ...*ChunkView) (chunkData []byte, err error) {
 
-	glog.V(4).Infof("readFromWholeChunkData %s offset %d [%d,%d) size at least %d", chunkView.FileId, chunkView.Offset, chunkView.LogicOffset, chunkView.LogicOffset+int64(chunkView.Size), chunkView.ChunkSize)
+	if c.lastChunkFileId == chunkView.FileId {
+		return c.lastChunkData, nil
+	}
 
-	chunkData = c.chunkCache.GetChunk(chunkView.FileId, chunkView.ChunkSize)
-	if chunkData != nil {
-		glog.V(4).Infof("cache hit %s [%d,%d)", chunkView.FileId, chunkView.LogicOffset-chunkView.Offset, chunkView.LogicOffset-chunkView.Offset+int64(len(chunkData)))
-	} else {
-		glog.V(4).Infof("doFetchFullChunkData %s", chunkView.FileId)
-		chunkData, err = c.doFetchFullChunkData(chunkView.FileId, chunkView.CipherKey, chunkView.IsGzipped)
-		if err != nil {
-			return
+	v, doErr := c.readOneWholeChunk(chunkView)
+
+	if doErr != nil {
+		return nil, doErr
+	}
+
+	chunkData = v.([]byte)
+
+	c.lastChunkData = chunkData
+	c.lastChunkFileId = chunkView.FileId
+
+	for _, nextChunkView := range nextChunkViews {
+		if c.chunkCache != nil && nextChunkView != nil {
+			go c.readOneWholeChunk(nextChunkView)
 		}
-		c.chunkCache.SetChunk(chunkView.FileId, chunkData)
 	}
 
 	return
 }
 
-func (c *ChunkReadAt) doFetchFullChunkData(fileId string, cipherKey []byte, isGzipped bool) ([]byte, error) {
+func (c *ChunkReadAt) readOneWholeChunk(chunkView *ChunkView) (interface{}, error) {
+
+	var err error
+
+	return c.fetchGroup.Do(chunkView.FileId, func() (interface{}, error) {
+
+		glog.V(4).Infof("readFromWholeChunkData %s offset %d [%d,%d) size at least %d", chunkView.FileId, chunkView.Offset, chunkView.LogicOffset, chunkView.LogicOffset+int64(chunkView.Size), chunkView.ChunkSize)
+
+		data := c.chunkCache.GetChunk(chunkView.FileId, chunkView.ChunkSize)
+		if data != nil {
+			glog.V(4).Infof("cache hit %s [%d,%d)", chunkView.FileId, chunkView.LogicOffset-chunkView.Offset, chunkView.LogicOffset-chunkView.Offset+int64(len(data)))
+		} else {
+			var err error
+			data, err = c.doFetchFullChunkData(chunkView)
+			if err != nil {
+				return data, err
+			}
+			c.chunkCache.SetChunk(chunkView.FileId, data)
+		}
+		return data, err
+	})
+}
+
+func (c *ChunkReadAt) doFetchFullChunkData(chunkView *ChunkView) ([]byte, error) {
+
+	glog.V(4).Infof("+ doFetchFullChunkData %s", chunkView.FileId)
+
+	data, err := fetchChunk(c.lookupFileId, chunkView.FileId, chunkView.CipherKey, chunkView.IsGzipped)
+
+	glog.V(4).Infof("- doFetchFullChunkData %s", chunkView.FileId)
 
-	return fetchChunk(c.lookupFileId, fileId, cipherKey, isGzipped)
+	return data, err
 
 }
diff --git a/weed/filer/stream.go b/weed/filer/stream.go
index dc6e414ca..f6e2a7643 100644
--- a/weed/filer/stream.go
+++ b/weed/filer/stream.go
@@ -17,28 +17,28 @@ func StreamContent(masterClient *wdclient.MasterClient, w io.Writer, chunks []*f
 	// fmt.Printf("start to stream content for chunks: %+v\n", chunks)
 	chunkViews := ViewFromChunks(masterClient.LookupFileId, chunks, offset, size)
 
-	fileId2Url := make(map[string]string)
+	fileId2Url := make(map[string][]string)
 
 	for _, chunkView := range chunkViews {
 
-		urlString, err := masterClient.LookupFileId(chunkView.FileId)
+		urlStrings, err := masterClient.LookupFileId(chunkView.FileId)
 		if err != nil {
 			glog.V(1).Infof("operation LookupFileId %s failed, err: %v", chunkView.FileId, err)
 			return err
 		}
-		fileId2Url[chunkView.FileId] = urlString
+		fileId2Url[chunkView.FileId] = urlStrings
 	}
 
 	for _, chunkView := range chunkViews {
 
-		urlString := fileId2Url[chunkView.FileId]
-		err := util.ReadUrlAsStream(urlString, chunkView.CipherKey, chunkView.IsGzipped, chunkView.IsFullChunk(), chunkView.Offset, int(chunkView.Size), func(data []byte) {
-			w.Write(data)
-		})
-		if err != nil {
-			glog.V(1).Infof("read %s failed, err: %v", chunkView.FileId, err)
+		urlStrings := fileId2Url[chunkView.FileId]
+
+		data, err := retriedFetchChunkData(urlStrings, chunkView.CipherKey, chunkView.IsGzipped, chunkView.IsFullChunk(), chunkView.Offset, int(chunkView.Size))
+		if err == nil {
 			return err
 		}
+		w.Write(data)
+
 	}
 
 	return nil
@@ -51,25 +51,24 @@ func ReadAll(masterClient *wdclient.MasterClient, chunks []*filer_pb.FileChunk)
 
 	buffer := bytes.Buffer{}
 
-	lookupFileIdFn := func(fileId string) (targetUrl string, err error) {
+	lookupFileIdFn := func(fileId string) (targetUrls []string, err error) {
 		return masterClient.LookupFileId(fileId)
 	}
 
 	chunkViews := ViewFromChunks(lookupFileIdFn, chunks, 0, math.MaxInt64)
 
 	for _, chunkView := range chunkViews {
-		urlString, err := lookupFileIdFn(chunkView.FileId)
+		urlStrings, err := lookupFileIdFn(chunkView.FileId)
 		if err != nil {
 			glog.V(1).Infof("operation LookupFileId %s failed, err: %v", chunkView.FileId, err)
 			return nil, err
 		}
-		err = util.ReadUrlAsStream(urlString, chunkView.CipherKey, chunkView.IsGzipped, chunkView.IsFullChunk(), chunkView.Offset, int(chunkView.Size), func(data []byte) {
-			buffer.Write(data)
-		})
+
+		data, err := retriedFetchChunkData(urlStrings, chunkView.CipherKey, chunkView.IsGzipped, chunkView.IsFullChunk(), chunkView.Offset, int(chunkView.Size))
 		if err != nil {
-			glog.V(1).Infof("read %s failed, err: %v", chunkView.FileId, err)
 			return nil, err
 		}
+		buffer.Write(data)
 	}
 	return buffer.Bytes(), nil
 }
@@ -89,7 +88,7 @@ var _ = io.ReadSeeker(&ChunkStreamReader{})
 
 func NewChunkStreamReaderFromFiler(masterClient *wdclient.MasterClient, chunks []*filer_pb.FileChunk) *ChunkStreamReader {
 
-	lookupFileIdFn := func(fileId string) (targetUrl string, err error) {
+	lookupFileIdFn := func(fileId string) (targetUrl []string, err error) {
 		return masterClient.LookupFileId(fileId)
 	}
 
@@ -169,17 +168,24 @@ func (c *ChunkStreamReader) Seek(offset int64, whence int) (int64, error) {
 }
 
 func (c *ChunkStreamReader) fetchChunkToBuffer(chunkView *ChunkView) error {
-	urlString, err := c.lookupFileId(chunkView.FileId)
+	urlStrings, err := c.lookupFileId(chunkView.FileId)
 	if err != nil {
 		glog.V(1).Infof("operation LookupFileId %s failed, err: %v", chunkView.FileId, err)
 		return err
 	}
 	var buffer bytes.Buffer
-	err = util.ReadUrlAsStream(urlString, chunkView.CipherKey, chunkView.IsGzipped, chunkView.IsFullChunk(), chunkView.Offset, int(chunkView.Size), func(data []byte) {
-		buffer.Write(data)
-	})
+	for _, urlString := range urlStrings {
+		err = util.ReadUrlAsStream(urlString, chunkView.CipherKey, chunkView.IsGzipped, chunkView.IsFullChunk(), chunkView.Offset, int(chunkView.Size), func(data []byte) {
+			buffer.Write(data)
+		})
+		if err != nil {
+			glog.V(1).Infof("read %s failed, err: %v", chunkView.FileId, err)
+			buffer.Reset()
+		} else {
+			break
+		}
+	}
 	if err != nil {
-		glog.V(1).Infof("read %s failed, err: %v", chunkView.FileId, err)
 		return err
 	}
 	c.buffer = buffer.Bytes()
diff --git a/weed/filesys/dir.go b/weed/filesys/dir.go
index 7d93dbd9f..4dede3a8b 100644
--- a/weed/filesys/dir.go
+++ b/weed/filesys/dir.go
@@ -82,9 +82,9 @@ func (dir *Dir) Getxattr(ctx context.Context, req *fuse.GetxattrRequest, resp *f
 func (dir *Dir) setRootDirAttributes(attr *fuse.Attr) {
 	attr.Inode = 1 // filer2.FullPath(dir.Path).AsInode()
 	attr.Valid = time.Hour
-	attr.Uid = dir.entry.Attributes.Uid
-	attr.Gid = dir.entry.Attributes.Gid
-	attr.Mode = os.FileMode(dir.entry.Attributes.FileMode)
+	attr.Uid = dir.wfs.option.MountUid
+	attr.Gid = dir.wfs.option.MountGid
+	attr.Mode = dir.wfs.option.MountMode
 	attr.Crtime = dir.wfs.option.MountCtime
 	attr.Ctime = dir.wfs.option.MountCtime
 	attr.Mtime = dir.wfs.option.MountMtime
@@ -354,7 +354,8 @@ func (dir *Dir) removeOneFile(req *fuse.RemoveRequest) error {
 func (dir *Dir) removeFolder(req *fuse.RemoveRequest) error {
 
 	glog.V(3).Infof("remove directory entry: %v", req)
-	err := filer_pb.Remove(dir.wfs, dir.FullPath(), req.Name, true, false, false, false, []int32{dir.wfs.signature})
+	ignoreRecursiveErr := true // ignore recursion error since the OS should manage it
+	err := filer_pb.Remove(dir.wfs, dir.FullPath(), req.Name, true, false, ignoreRecursiveErr, false, []int32{dir.wfs.signature})
 	if err != nil {
 		glog.V(0).Infof("remove %s/%s: %v", dir.FullPath(), req.Name, err)
 		if strings.Contains(err.Error(), "non-empty") {
diff --git a/weed/filesys/dir_link.go b/weed/filesys/dir_link.go
index 368ded442..f6bc41b56 100644
--- a/weed/filesys/dir_link.go
+++ b/weed/filesys/dir_link.go
@@ -18,6 +18,10 @@ var _ = fs.NodeLinker(&Dir{})
 var _ = fs.NodeSymlinker(&Dir{})
 var _ = fs.NodeReadlinker(&File{})
 
+const (
+	HARD_LINK_MARKER = '\x01'
+)
+
 func (dir *Dir) Link(ctx context.Context, req *fuse.LinkRequest, old fs.Node) (fs.Node, error) {
 
 	oldFile, ok := old.(*File)
@@ -33,7 +37,7 @@ func (dir *Dir) Link(ctx context.Context, req *fuse.LinkRequest, old fs.Node) (f
 
 	// update old file to hardlink mode
 	if len(oldFile.entry.HardLinkId) == 0 {
-		oldFile.entry.HardLinkId = util.RandomBytes(16)
+		oldFile.entry.HardLinkId = append(util.RandomBytes(16), HARD_LINK_MARKER)
 		oldFile.entry.HardLinkCounter = 1
 	}
 	oldFile.entry.HardLinkCounter++
diff --git a/weed/filesys/wfs.go b/weed/filesys/wfs.go
index ef31a9258..57b4c3da5 100644
--- a/weed/filesys/wfs.go
+++ b/weed/filesys/wfs.go
@@ -37,6 +37,9 @@ type Option struct {
 	EntryCacheTtl      time.Duration
 	Umask              os.FileMode
 
+	MountUid   uint32
+	MountGid   uint32
+	MountMode  os.FileMode
 	MountCtime time.Time
 	MountMtime time.Time
 
@@ -86,7 +89,7 @@ func NewSeaweedFileSystem(option *Option) *WFS {
 	cacheDir := path.Join(option.CacheDir, cacheUniqueId)
 	if option.CacheSizeMB > 0 {
 		os.MkdirAll(cacheDir, os.FileMode(0777)&^option.Umask)
-		wfs.chunkCache = chunk_cache.NewTieredChunkCache(256, cacheDir, option.CacheSizeMB)
+		wfs.chunkCache = chunk_cache.NewTieredChunkCache(256, cacheDir, option.CacheSizeMB, 1024*1024)
 	}
 
 	wfs.metaCache = meta_cache.NewMetaCache(path.Join(cacheDir, "meta"), option.UidGidMapper)
diff --git a/weed/operation/submit.go b/weed/operation/submit.go
index e8bec382a..25843c892 100644
--- a/weed/operation/submit.go
+++ b/weed/operation/submit.go
@@ -170,6 +170,9 @@ func (fi FilePart) Upload(maxMB int, master string, usePublicUrl bool, jwt secur
 				}
 			}
 			fileUrl := "http://" + ret.Url + "/" + id
+			if usePublicUrl {
+				fileUrl = "http://" + ret.PublicUrl + "/" + id
+			}
 			count, e := upload_one_chunk(
 				baseName+"-"+strconv.FormatInt(i+1, 10),
 				io.LimitReader(fi.Reader, chunkSize),
diff --git a/weed/pb/master.proto b/weed/pb/master.proto
index e96582df9..96c3c75cc 100644
--- a/weed/pb/master.proto
+++ b/weed/pb/master.proto
@@ -274,6 +274,8 @@ message GetMasterConfigurationResponse {
     string metrics_address = 1;
     uint32 metrics_interval_seconds = 2;
     repeated StorageBackend storage_backends = 3;
+    string default_replication = 4;
+    string leader = 5;
 }
 
 message ListMasterClientsRequest {
diff --git a/weed/pb/master_pb/master.pb.go b/weed/pb/master_pb/master.pb.go
index 98e501db3..d23366ade 100644
--- a/weed/pb/master_pb/master.pb.go
+++ b/weed/pb/master_pb/master.pb.go
@@ -2279,6 +2279,8 @@ type GetMasterConfigurationResponse struct {
 	MetricsAddress         string            `protobuf:"bytes,1,opt,name=metrics_address,json=metricsAddress,proto3" json:"metrics_address,omitempty"`
 	MetricsIntervalSeconds uint32            `protobuf:"varint,2,opt,name=metrics_interval_seconds,json=metricsIntervalSeconds,proto3" json:"metrics_interval_seconds,omitempty"`
 	StorageBackends        []*StorageBackend `protobuf:"bytes,3,rep,name=storage_backends,json=storageBackends,proto3" json:"storage_backends,omitempty"`
+	DefaultReplication     string            `protobuf:"bytes,4,opt,name=default_replication,json=defaultReplication,proto3" json:"default_replication,omitempty"`
+	Leader                 string            `protobuf:"bytes,5,opt,name=leader,proto3" json:"leader,omitempty"`
 }
 
 func (x *GetMasterConfigurationResponse) Reset() {
@@ -2334,6 +2336,20 @@ func (x *GetMasterConfigurationResponse) GetStorageBackends() []*StorageBackend
 	return nil
 }
 
+func (x *GetMasterConfigurationResponse) GetDefaultReplication() string {
+	if x != nil {
+		return x.DefaultReplication
+	}
+	return ""
+}
+
+func (x *GetMasterConfigurationResponse) GetLeader() string {
+	if x != nil {
+		return x.Leader
+	}
+	return ""
+}
+
 type ListMasterClientsRequest struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -3197,7 +3213,7 @@ var file_master_proto_rawDesc = []byte{
 	0x70, 0x62, 0x2e, 0x4c, 0x6f, 0x63, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x52, 0x09, 0x6c, 0x6f, 0x63,
 	0x61, 0x74, 0x69, 0x6f, 0x6e, 0x73, 0x22, 0x1f, 0x0a, 0x1d, 0x47, 0x65, 0x74, 0x4d, 0x61, 0x73,
 	0x74, 0x65, 0x72, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x75, 0x72, 0x61, 0x74, 0x69, 0x6f, 0x6e,
-	0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x22, 0xc9, 0x01, 0x0a, 0x1e, 0x47, 0x65, 0x74, 0x4d,
+	0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x22, 0x92, 0x02, 0x0a, 0x1e, 0x47, 0x65, 0x74, 0x4d,
 	0x61, 0x73, 0x74, 0x65, 0x72, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x75, 0x72, 0x61, 0x74, 0x69,
 	0x6f, 0x6e, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x12, 0x27, 0x0a, 0x0f, 0x6d, 0x65,
 	0x74, 0x72, 0x69, 0x63, 0x73, 0x5f, 0x61, 0x64, 0x64, 0x72, 0x65, 0x73, 0x73, 0x18, 0x01, 0x20,
@@ -3210,115 +3226,119 @@ var file_master_proto_rawDesc = []byte{
 	0x73, 0x18, 0x03, 0x20, 0x03, 0x28, 0x0b, 0x32, 0x19, 0x2e, 0x6d, 0x61, 0x73, 0x74, 0x65, 0x72,
 	0x5f, 0x70, 0x62, 0x2e, 0x53, 0x74, 0x6f, 0x72, 0x61, 0x67, 0x65, 0x42, 0x61, 0x63, 0x6b, 0x65,
 	0x6e, 0x64, 0x52, 0x0f, 0x73, 0x74, 0x6f, 0x72, 0x61, 0x67, 0x65, 0x42, 0x61, 0x63, 0x6b, 0x65,
-	0x6e, 0x64, 0x73, 0x22, 0x3b, 0x0a, 0x18, 0x4c, 0x69, 0x73, 0x74, 0x4d, 0x61, 0x73, 0x74, 0x65,
-	0x72, 0x43, 0x6c, 0x69, 0x65, 0x6e, 0x74, 0x73, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x12,
-	0x1f, 0x0a, 0x0b, 0x63, 0x6c, 0x69, 0x65, 0x6e, 0x74, 0x5f, 0x74, 0x79, 0x70, 0x65, 0x18, 0x01,
-	0x20, 0x01, 0x28, 0x09, 0x52, 0x0a, 0x63, 0x6c, 0x69, 0x65, 0x6e, 0x74, 0x54, 0x79, 0x70, 0x65,
-	0x22, 0x42, 0x0a, 0x19, 0x4c, 0x69, 0x73, 0x74, 0x4d, 0x61, 0x73, 0x74, 0x65, 0x72, 0x43, 0x6c,
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-	0x01, 0x20, 0x03, 0x28, 0x09, 0x52, 0x0d, 0x67, 0x72, 0x70, 0x63, 0x41, 0x64, 0x64, 0x72, 0x65,
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+	0x5f, 0x70, 0x62, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
diff --git a/weed/replication/repl_util/replication_utli.go b/weed/replication/repl_util/replication_utli.go
new file mode 100644
index 000000000..9b18275b5
--- /dev/null
+++ b/weed/replication/repl_util/replication_utli.go
@@ -0,0 +1,40 @@
+package repl_util
+
+import (
+	"github.com/chrislusf/seaweedfs/weed/filer"
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/replication/source"
+	"github.com/chrislusf/seaweedfs/weed/util"
+)
+
+func CopyFromChunkViews(chunkViews []*filer.ChunkView, filerSource *source.FilerSource, writeFunc func(data []byte) error) error {
+
+	for _, chunk := range chunkViews {
+
+		fileUrls, err := filerSource.LookupFileId(chunk.FileId)
+		if err != nil {
+			return err
+		}
+
+		var writeErr error
+
+		for _, fileUrl := range fileUrls {
+			err = util.ReadUrlAsStream(fileUrl+"?readDeleted=true", nil, false, chunk.IsFullChunk(), chunk.Offset, int(chunk.Size), func(data []byte) {
+				writeErr = writeFunc(data)
+			})
+			if err != nil {
+				glog.V(1).Infof("read from %s: %v", fileUrl, err)
+			} else if writeErr != nil {
+				glog.V(1).Infof("copy from %s: %v", fileUrl, writeErr)
+			} else {
+				break
+			}
+		}
+
+		if err != nil {
+			return err
+		}
+
+	}
+	return nil
+}
diff --git a/weed/replication/sink/azuresink/azure_sink.go b/weed/replication/sink/azuresink/azure_sink.go
index dab5cf4f4..df70be64b 100644
--- a/weed/replication/sink/azuresink/azure_sink.go
+++ b/weed/replication/sink/azuresink/azure_sink.go
@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"context"
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/replication/repl_util"
 	"net/url"
 	"strings"
 
@@ -107,25 +108,13 @@ func (g *AzureSink) CreateEntry(key string, entry *filer_pb.Entry, signatures []
 		return err
 	}
 
-	for _, chunk := range chunkViews {
-
-		fileUrl, err := g.filerSource.LookupFileId(chunk.FileId)
-		if err != nil {
-			return err
-		}
-
-		var writeErr error
-		readErr := util.ReadUrlAsStream(fileUrl+"?readDeleted=true", nil, false, chunk.IsFullChunk(), chunk.Offset, int(chunk.Size), func(data []byte) {
-			_, writeErr = appendBlobURL.AppendBlock(context.Background(), bytes.NewReader(data), azblob.AppendBlobAccessConditions{}, nil)
-		})
-
-		if readErr != nil {
-			return readErr
-		}
-		if writeErr != nil {
-			return writeErr
-		}
+	writeFunc := func(data []byte) error {
+		_, writeErr := appendBlobURL.AppendBlock(context.Background(), bytes.NewReader(data), azblob.AppendBlobAccessConditions{}, nil)
+		return writeErr
+	}
 
+	if err := repl_util.CopyFromChunkViews(chunkViews, g.filerSource, writeFunc); err != nil {
+		return err
 	}
 
 	return nil
diff --git a/weed/replication/sink/b2sink/b2_sink.go b/weed/replication/sink/b2sink/b2_sink.go
index cf212f129..24f0ecbbc 100644
--- a/weed/replication/sink/b2sink/b2_sink.go
+++ b/weed/replication/sink/b2sink/b2_sink.go
@@ -2,6 +2,7 @@ package B2Sink
 
 import (
 	"context"
+	"github.com/chrislusf/seaweedfs/weed/replication/repl_util"
 	"strings"
 
 	"github.com/chrislusf/seaweedfs/weed/filer"
@@ -95,31 +96,18 @@ func (g *B2Sink) CreateEntry(key string, entry *filer_pb.Entry, signatures []int
 	targetObject := bucket.Object(key)
 	writer := targetObject.NewWriter(context.Background())
 
-	for _, chunk := range chunkViews {
-
-		fileUrl, err := g.filerSource.LookupFileId(chunk.FileId)
-		if err != nil {
-			return err
-		}
-
-		var writeErr error
-		readErr := util.ReadUrlAsStream(fileUrl+"?readDeleted=true", nil, false, chunk.IsFullChunk(), chunk.Offset, int(chunk.Size), func(data []byte) {
-			_, err := writer.Write(data)
-			if err != nil {
-				writeErr = err
-			}
-		})
+	writeFunc := func(data []byte) error {
+		_, writeErr := writer.Write(data)
+		return writeErr
+	}
 
-		if readErr != nil {
-			return readErr
-		}
-		if writeErr != nil {
-			return writeErr
-		}
+	defer writer.Close()
 
+	if err := repl_util.CopyFromChunkViews(chunkViews, g.filerSource, writeFunc); err != nil {
+		return err
 	}
 
-	return writer.Close()
+	return nil
 
 }
 
diff --git a/weed/replication/sink/gcssink/gcs_sink.go b/weed/replication/sink/gcssink/gcs_sink.go
index c6bfa212a..badabc32c 100644
--- a/weed/replication/sink/gcssink/gcs_sink.go
+++ b/weed/replication/sink/gcssink/gcs_sink.go
@@ -3,6 +3,7 @@ package gcssink
 import (
 	"context"
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/replication/repl_util"
 	"os"
 
 	"cloud.google.com/go/storage"
@@ -93,25 +94,14 @@ func (g *GcsSink) CreateEntry(key string, entry *filer_pb.Entry, signatures []in
 	chunkViews := filer.ViewFromChunks(g.filerSource.LookupFileId, entry.Chunks, 0, int64(totalSize))
 
 	wc := g.client.Bucket(g.bucket).Object(key).NewWriter(context.Background())
+	defer wc.Close()
 
-	for _, chunk := range chunkViews {
-
-		fileUrl, err := g.filerSource.LookupFileId(chunk.FileId)
-		if err != nil {
-			return err
-		}
-
-		err = util.ReadUrlAsStream(fileUrl+"?readDeleted=true", nil, false, chunk.IsFullChunk(), chunk.Offset, int(chunk.Size), func(data []byte) {
-			wc.Write(data)
-		})
-
-		if err != nil {
-			return err
-		}
-
+	writeFunc := func(data []byte) error {
+		_, writeErr := wc.Write(data)
+		return writeErr
 	}
 
-	if err := wc.Close(); err != nil {
+	if err := repl_util.CopyFromChunkViews(chunkViews, g.filerSource, writeFunc); err != nil {
 		return err
 	}
 
diff --git a/weed/replication/sink/s3sink/s3_write.go b/weed/replication/sink/s3sink/s3_write.go
index 8a8e7a92b..45265d1ba 100644
--- a/weed/replication/sink/s3sink/s3_write.go
+++ b/weed/replication/sink/s3sink/s3_write.go
@@ -157,11 +157,18 @@ func (s3sink *S3Sink) uploadPartCopy(key, uploadId string, partId int64, copySou
 }
 
 func (s3sink *S3Sink) buildReadSeeker(chunk *filer.ChunkView) (io.ReadSeeker, error) {
-	fileUrl, err := s3sink.filerSource.LookupFileId(chunk.FileId)
+	fileUrls, err := s3sink.filerSource.LookupFileId(chunk.FileId)
 	if err != nil {
 		return nil, err
 	}
 	buf := make([]byte, chunk.Size)
-	util.ReadUrl(fileUrl, nil, false, false, chunk.Offset, int(chunk.Size), buf)
+	for _, fileUrl := range fileUrls {
+		_, err = util.ReadUrl(fileUrl, nil, false, false, chunk.Offset, int(chunk.Size), buf)
+		if err != nil {
+			glog.V(1).Infof("read from %s: %v", fileUrl, err)
+		} else {
+			break
+		}
+	}
 	return bytes.NewReader(buf), nil
 }
diff --git a/weed/replication/source/filer_source.go b/weed/replication/source/filer_source.go
index 9106ee98b..c3ef8835c 100644
--- a/weed/replication/source/filer_source.go
+++ b/weed/replication/source/filer_source.go
@@ -41,7 +41,7 @@ func (fs *FilerSource) DoInitialize(grpcAddress string, dir string) (err error)
 	return nil
 }
 
-func (fs *FilerSource) LookupFileId(part string) (fileUrl string, err error) {
+func (fs *FilerSource) LookupFileId(part string) (fileUrls []string, err error) {
 
 	vid2Locations := make(map[string]*filer_pb.Locations)
 
@@ -64,29 +64,38 @@ func (fs *FilerSource) LookupFileId(part string) (fileUrl string, err error) {
 
 	if err != nil {
 		glog.V(1).Infof("LookupFileId volume id %s: %v", vid, err)
-		return "", fmt.Errorf("LookupFileId volume id %s: %v", vid, err)
+		return nil, fmt.Errorf("LookupFileId volume id %s: %v", vid, err)
 	}
 
 	locations := vid2Locations[vid]
 
 	if locations == nil || len(locations.Locations) == 0 {
 		glog.V(1).Infof("LookupFileId locate volume id %s: %v", vid, err)
-		return "", fmt.Errorf("LookupFileId locate volume id %s: %v", vid, err)
+		return nil, fmt.Errorf("LookupFileId locate volume id %s: %v", vid, err)
 	}
 
-	fileUrl = fmt.Sprintf("http://%s/%s", locations.Locations[0].Url, part)
+	for _, loc := range locations.Locations {
+		fileUrls = append(fileUrls, fmt.Sprintf("http://%s/%s", loc.Url, part))
+	}
 
 	return
 }
 
 func (fs *FilerSource) ReadPart(part string) (filename string, header http.Header, resp *http.Response, err error) {
 
-	fileUrl, err := fs.LookupFileId(part)
+	fileUrls, err := fs.LookupFileId(part)
 	if err != nil {
 		return "", nil, nil, err
 	}
 
-	filename, header, resp, err = util.DownloadFile(fileUrl)
+	for _, fileUrl := range fileUrls {
+		filename, header, resp, err = util.DownloadFile(fileUrl)
+		if err != nil {
+			glog.V(1).Infof("fail to read from %s: %v", fileUrl, err)
+		} else {
+			break
+		}
+	}
 
 	return filename, header, resp, err
 }
diff --git a/weed/s3api/auth_credentials.go b/weed/s3api/auth_credentials.go
index 31519e6e3..2b7666345 100644
--- a/weed/s3api/auth_credentials.go
+++ b/weed/s3api/auth_credentials.go
@@ -16,9 +16,11 @@ import (
 type Action string
 
 const (
-	ACTION_READ  = "Read"
-	ACTION_WRITE = "Write"
-	ACTION_ADMIN = "Admin"
+	ACTION_READ    = "Read"
+	ACTION_WRITE   = "Write"
+	ACTION_ADMIN   = "Admin"
+	ACTION_TAGGING = "Tagging"
+	ACTION_LIST    = "List"
 )
 
 type Iam interface {
diff --git a/weed/s3api/filer_util_tags.go b/weed/s3api/filer_util_tags.go
new file mode 100644
index 000000000..3d4da7825
--- /dev/null
+++ b/weed/s3api/filer_util_tags.go
@@ -0,0 +1,104 @@
+package s3api
+
+import (
+	"strings"
+
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+)
+
+const (
+	S3TAG_PREFIX = "s3-"
+)
+
+func (s3a *S3ApiServer) getTags(parentDirectoryPath string, entryName string) (tags map[string]string, err error) {
+
+	err = s3a.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
+
+		resp, err := filer_pb.LookupEntry(client, &filer_pb.LookupDirectoryEntryRequest{
+			Directory: parentDirectoryPath,
+			Name:      entryName,
+		})
+		if err != nil {
+			return err
+		}
+		tags = make(map[string]string)
+		for k, v := range resp.Entry.Extended {
+			if strings.HasPrefix(k, S3TAG_PREFIX) {
+				tags[k[len(S3TAG_PREFIX):]] = string(v)
+			}
+		}
+		return nil
+	})
+	return
+}
+
+func (s3a *S3ApiServer) setTags(parentDirectoryPath string, entryName string, tags map[string]string) (err error) {
+
+	return s3a.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
+
+		resp, err := filer_pb.LookupEntry(client, &filer_pb.LookupDirectoryEntryRequest{
+			Directory: parentDirectoryPath,
+			Name:      entryName,
+		})
+		if err != nil {
+			return err
+		}
+
+		for k, _ := range resp.Entry.Extended {
+			if strings.HasPrefix(k, S3TAG_PREFIX) {
+				delete(resp.Entry.Extended, k)
+			}
+		}
+
+		if resp.Entry.Extended == nil {
+			resp.Entry.Extended = make(map[string][]byte)
+		}
+		for k, v := range tags {
+			resp.Entry.Extended[S3TAG_PREFIX+k] = []byte(v)
+		}
+
+		return filer_pb.UpdateEntry(client, &filer_pb.UpdateEntryRequest{
+			Directory:          parentDirectoryPath,
+			Entry:              resp.Entry,
+			IsFromOtherCluster: false,
+			Signatures:         nil,
+		})
+
+	})
+
+}
+
+func (s3a *S3ApiServer) rmTags(parentDirectoryPath string, entryName string) (err error) {
+
+	return s3a.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
+
+		resp, err := filer_pb.LookupEntry(client, &filer_pb.LookupDirectoryEntryRequest{
+			Directory: parentDirectoryPath,
+			Name:      entryName,
+		})
+		if err != nil {
+			return err
+		}
+
+		hasDeletion := false
+		for k, _ := range resp.Entry.Extended {
+			if strings.HasPrefix(k, S3TAG_PREFIX) {
+				delete(resp.Entry.Extended, k)
+				hasDeletion = true
+			}
+		}
+
+		if !hasDeletion {
+			return nil
+		}
+
+		return filer_pb.UpdateEntry(client, &filer_pb.UpdateEntryRequest{
+			Directory:          parentDirectoryPath,
+			Entry:              resp.Entry,
+			IsFromOtherCluster: false,
+			Signatures:         nil,
+		})
+
+	})
+
+}
diff --git a/weed/s3api/s3api_object_tagging_handlers.go b/weed/s3api/s3api_object_tagging_handlers.go
new file mode 100644
index 000000000..94719834c
--- /dev/null
+++ b/weed/s3api/s3api_object_tagging_handlers.go
@@ -0,0 +1,117 @@
+package s3api
+
+import (
+	"encoding/xml"
+	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/s3api/s3err"
+	"github.com/chrislusf/seaweedfs/weed/util"
+	"io"
+	"io/ioutil"
+	"net/http"
+)
+
+// GetObjectTaggingHandler - GET object tagging
+// API reference: https://docs.aws.amazon.com/AmazonS3/latest/API/API_GetObjectTagging.html
+func (s3a *S3ApiServer) GetObjectTaggingHandler(w http.ResponseWriter, r *http.Request) {
+
+	bucket, object := getBucketAndObject(r)
+
+	target := util.FullPath(fmt.Sprintf("%s/%s%s", s3a.option.BucketsPath, bucket, object))
+	dir, name := target.DirAndName()
+
+	tags, err := s3a.getTags(dir, name)
+	if err != nil {
+		if err == filer_pb.ErrNotFound {
+			glog.Errorf("GetObjectTaggingHandler %s: %v", r.URL, err)
+			writeErrorResponse(w, s3err.ErrNoSuchKey, r.URL)
+		} else {
+			glog.Errorf("GetObjectTaggingHandler %s: %v", r.URL, err)
+			writeErrorResponse(w, s3err.ErrInternalError, r.URL)
+		}
+		return
+	}
+
+	writeSuccessResponseXML(w, encodeResponse(FromTags(tags)))
+
+}
+
+// PutObjectTaggingHandler Put object tagging
+// API reference: https://docs.aws.amazon.com/AmazonS3/latest/API/API_PutObjectTagging.html
+func (s3a *S3ApiServer) PutObjectTaggingHandler(w http.ResponseWriter, r *http.Request) {
+
+	bucket, object := getBucketAndObject(r)
+
+	target := util.FullPath(fmt.Sprintf("%s/%s%s", s3a.option.BucketsPath, bucket, object))
+	dir, name := target.DirAndName()
+
+	tagging := &Tagging{}
+	input, err := ioutil.ReadAll(io.LimitReader(r.Body, r.ContentLength))
+	if err != nil {
+		glog.Errorf("PutObjectTaggingHandler read input %s: %v", r.URL, err)
+		writeErrorResponse(w, s3err.ErrInternalError, r.URL)
+		return
+	}
+	if err = xml.Unmarshal(input, tagging); err != nil {
+		glog.Errorf("PutObjectTaggingHandler Unmarshal %s: %v", r.URL, err)
+		writeErrorResponse(w, s3err.ErrMalformedXML, r.URL)
+		return
+	}
+	tags := tagging.ToTags()
+	if len(tags) > 10 {
+		glog.Errorf("PutObjectTaggingHandler tags %s: %d tags more than 10", r.URL, len(tags))
+		writeErrorResponse(w, s3err.ErrInvalidTag, r.URL)
+		return
+	}
+	for k, v := range tags {
+		if len(k) > 128 {
+			glog.Errorf("PutObjectTaggingHandler tags %s: tag key %s longer than 128", r.URL, k)
+			writeErrorResponse(w, s3err.ErrInvalidTag, r.URL)
+			return
+		}
+		if len(v) > 256 {
+			glog.Errorf("PutObjectTaggingHandler tags %s: tag value %s longer than 256", r.URL, v)
+			writeErrorResponse(w, s3err.ErrInvalidTag, r.URL)
+			return
+		}
+	}
+
+	if err = s3a.setTags(dir, name, tagging.ToTags()); err != nil {
+		if err == filer_pb.ErrNotFound {
+			glog.Errorf("PutObjectTaggingHandler setTags %s: %v", r.URL, err)
+			writeErrorResponse(w, s3err.ErrNoSuchKey, r.URL)
+		} else {
+			glog.Errorf("PutObjectTaggingHandler setTags %s: %v", r.URL, err)
+			writeErrorResponse(w, s3err.ErrInternalError, r.URL)
+		}
+		return
+	}
+
+	w.WriteHeader(http.StatusNoContent)
+
+}
+
+// DeleteObjectTaggingHandler Delete object tagging
+// API reference: https://docs.aws.amazon.com/AmazonS3/latest/API/API_DeleteObjectTagging.html
+func (s3a *S3ApiServer) DeleteObjectTaggingHandler(w http.ResponseWriter, r *http.Request) {
+
+	bucket, object := getBucketAndObject(r)
+
+	target := util.FullPath(fmt.Sprintf("%s/%s%s", s3a.option.BucketsPath, bucket, object))
+	dir, name := target.DirAndName()
+
+	err := s3a.rmTags(dir, name)
+	if err != nil {
+		if err == filer_pb.ErrNotFound {
+			glog.Errorf("DeleteObjectTaggingHandler %s: %v", r.URL, err)
+			writeErrorResponse(w, s3err.ErrNoSuchKey, r.URL)
+		} else {
+			glog.Errorf("DeleteObjectTaggingHandler %s: %v", r.URL, err)
+			writeErrorResponse(w, s3err.ErrInternalError, r.URL)
+		}
+		return
+	}
+
+	w.WriteHeader(http.StatusNoContent)
+}
diff --git a/weed/s3api/s3api_server.go b/weed/s3api/s3api_server.go
index 5ddfdafd0..1ab80c3ee 100644
--- a/weed/s3api/s3api_server.go
+++ b/weed/s3api/s3api_server.go
@@ -64,9 +64,16 @@ func (s3a *S3ApiServer) registerRouter(router *mux.Router) {
 		// AbortMultipartUpload
 		bucket.Methods("DELETE").Path("/{object:.+}").HandlerFunc(track(s3a.iam.Auth(s3a.AbortMultipartUploadHandler, ACTION_WRITE), "DELETE")).Queries("uploadId", "{uploadId:.*}")
 		// ListObjectParts
-		bucket.Methods("GET").Path("/{object:.+}").HandlerFunc(track(s3a.iam.Auth(s3a.ListObjectPartsHandler, ACTION_WRITE), "GET")).Queries("uploadId", "{uploadId:.*}")
+		bucket.Methods("GET").Path("/{object:.+}").HandlerFunc(track(s3a.iam.Auth(s3a.ListObjectPartsHandler, ACTION_READ), "GET")).Queries("uploadId", "{uploadId:.*}")
 		// ListMultipartUploads
-		bucket.Methods("GET").HandlerFunc(track(s3a.iam.Auth(s3a.ListMultipartUploadsHandler, ACTION_WRITE), "GET")).Queries("uploads", "")
+		bucket.Methods("GET").HandlerFunc(track(s3a.iam.Auth(s3a.ListMultipartUploadsHandler, ACTION_READ), "GET")).Queries("uploads", "")
+
+		// GetObjectTagging
+		bucket.Methods("GET").Path("/{object:.+}").HandlerFunc(track(s3a.iam.Auth(s3a.GetObjectTaggingHandler, ACTION_READ), "GET")).Queries("tagging", "")
+		// PutObjectTagging
+		bucket.Methods("PUT").Path("/{object:.+}").HandlerFunc(track(s3a.iam.Auth(s3a.PutObjectTaggingHandler, ACTION_TAGGING), "PUT")).Queries("tagging", "")
+		// DeleteObjectTagging
+		bucket.Methods("DELETE").Path("/{object:.+}").HandlerFunc(track(s3a.iam.Auth(s3a.DeleteObjectTaggingHandler, ACTION_TAGGING), "DELETE")).Queries("tagging", "")
 
 		// CopyObject
 		bucket.Methods("PUT").Path("/{object:.+}").HeadersRegexp("X-Amz-Copy-Source", ".*?(\\/|%2F).*?").HandlerFunc(track(s3a.iam.Auth(s3a.CopyObjectHandler, ACTION_WRITE), "COPY"))
@@ -81,11 +88,11 @@ func (s3a *S3ApiServer) registerRouter(router *mux.Router) {
 		bucket.Methods("DELETE").HandlerFunc(track(s3a.iam.Auth(s3a.DeleteBucketHandler, ACTION_WRITE), "DELETE"))
 
 		// ListObjectsV2
-		bucket.Methods("GET").HandlerFunc(track(s3a.iam.Auth(s3a.ListObjectsV2Handler, ACTION_READ), "LIST")).Queries("list-type", "2")
+		bucket.Methods("GET").HandlerFunc(track(s3a.iam.Auth(s3a.ListObjectsV2Handler, ACTION_LIST), "LIST")).Queries("list-type", "2")
 		// GetObject, but directory listing is not supported
 		bucket.Methods("GET").Path("/{object:.+}").HandlerFunc(track(s3a.iam.Auth(s3a.GetObjectHandler, ACTION_READ), "GET"))
 		// ListObjectsV1 (Legacy)
-		bucket.Methods("GET").HandlerFunc(track(s3a.iam.Auth(s3a.ListObjectsV1Handler, ACTION_READ), "LIST"))
+		bucket.Methods("GET").HandlerFunc(track(s3a.iam.Auth(s3a.ListObjectsV1Handler, ACTION_LIST), "LIST"))
 
 		// PostPolicy
 		bucket.Methods("POST").HeadersRegexp("Content-Type", "multipart/form-data*").HandlerFunc(track(s3a.iam.Auth(s3a.PostPolicyBucketHandler, ACTION_WRITE), "POST"))
@@ -112,7 +119,7 @@ func (s3a *S3ApiServer) registerRouter(router *mux.Router) {
 	}
 
 	// ListBuckets
-	apiRouter.Methods("GET").Path("/").HandlerFunc(track(s3a.iam.Auth(s3a.ListBucketsHandler, ACTION_READ), "LIST"))
+	apiRouter.Methods("GET").Path("/").HandlerFunc(track(s3a.iam.Auth(s3a.ListBucketsHandler, ACTION_ADMIN), "LIST"))
 
 	// NotFound
 	apiRouter.NotFoundHandler = http.HandlerFunc(notFoundHandler)
diff --git a/weed/s3api/s3err/s3api_errors.go b/weed/s3api/s3err/s3api_errors.go
index cccef0227..f95652afb 100644
--- a/weed/s3api/s3err/s3api_errors.go
+++ b/weed/s3api/s3err/s3api_errors.go
@@ -61,6 +61,7 @@ const (
 	ErrInternalError
 	ErrInvalidCopyDest
 	ErrInvalidCopySource
+	ErrInvalidTag
 	ErrAuthHeaderEmpty
 	ErrSignatureVersionNotSupported
 	ErrMalformedPOSTRequest
@@ -188,6 +189,11 @@ var errorCodeResponse = map[ErrorCode]APIError{
 		Description:    "Copy Source must mention the source bucket and key: sourcebucket/sourcekey.",
 		HTTPStatusCode: http.StatusBadRequest,
 	},
+	ErrInvalidTag: {
+		Code:           "InvalidArgument",
+		Description:    "The Tag value you have provided is invalid",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
 	ErrMalformedXML: {
 		Code:           "MalformedXML",
 		Description:    "The XML you provided was not well-formed or did not validate against our published schema.",
diff --git a/weed/s3api/stats.go b/weed/s3api/stats.go
index 16a546c66..b667b32a0 100644
--- a/weed/s3api/stats.go
+++ b/weed/s3api/stats.go
@@ -4,18 +4,35 @@ import (
 	stats_collect "github.com/chrislusf/seaweedfs/weed/stats"
 	"github.com/chrislusf/seaweedfs/weed/util"
 	"net/http"
+	"strconv"
 	"time"
 )
 
-func track(f http.HandlerFunc, action string) http.HandlerFunc {
+type StatusRecorder struct {
+	http.ResponseWriter
+	Status int
+}
 
-	return func(w http.ResponseWriter, r *http.Request) {
+func NewStatusResponseWriter(w http.ResponseWriter) *StatusRecorder {
+	return &StatusRecorder{w, http.StatusOK}
+}
 
-		w.Header().Set("Server", "SeaweedFS S3 "+util.VERSION)
+func (r *StatusRecorder) WriteHeader(status int) {
+	r.Status = status
+	r.ResponseWriter.WriteHeader(status)
+}
 
+func (r *StatusRecorder) Flush() {
+	r.ResponseWriter.(http.Flusher).Flush()
+}
+
+func track(f http.HandlerFunc, action string) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Server", "SeaweedFS S3 "+util.VERSION)
+		recorder := NewStatusResponseWriter(w)
 		start := time.Now()
-		stats_collect.S3RequestCounter.WithLabelValues(action).Inc()
-		f(w, r)
+		f(recorder, r)
 		stats_collect.S3RequestHistogram.WithLabelValues(action).Observe(time.Since(start).Seconds())
+		stats_collect.S3RequestCounter.WithLabelValues(action, strconv.Itoa(recorder.Status)).Inc()
 	}
 }
diff --git a/weed/s3api/tags.go b/weed/s3api/tags.go
new file mode 100644
index 000000000..9ff7d1fba
--- /dev/null
+++ b/weed/s3api/tags.go
@@ -0,0 +1,38 @@
+package s3api
+
+import (
+	"encoding/xml"
+)
+
+type Tag struct {
+	Key   string `xml:"Key"`
+	Value string `xml:"Value"`
+}
+
+type TagSet struct {
+	Tag []Tag `xml:"Tag"`
+}
+
+type Tagging struct {
+	XMLName xml.Name `xml:"http://s3.amazonaws.com/doc/2006-03-01/ Tagging"`
+	TagSet  TagSet   `xml:"TagSet"`
+}
+
+func (t *Tagging) ToTags() map[string]string {
+	output := make(map[string]string)
+	for _, tag := range t.TagSet.Tag {
+		output[tag.Key] = tag.Value
+	}
+	return output
+}
+
+func FromTags(tags map[string]string) (t *Tagging) {
+	t = &Tagging{}
+	for k, v := range tags {
+		t.TagSet.Tag = append(t.TagSet.Tag, Tag{
+			Key:   k,
+			Value: v,
+		})
+	}
+	return
+}
diff --git a/weed/s3api/tags_test.go b/weed/s3api/tags_test.go
new file mode 100644
index 000000000..887843d6f
--- /dev/null
+++ b/weed/s3api/tags_test.go
@@ -0,0 +1,50 @@
+package s3api
+
+import (
+	"encoding/xml"
+	"github.com/stretchr/testify/assert"
+	"testing"
+)
+
+func TestXMLUnmarshall(t *testing.T) {
+
+	input := `<?xml version="1.0" encoding="UTF-8"?>
+<Tagging xmlns="http://s3.amazonaws.com/doc/2006-03-01/">
+   <TagSet>
+      <Tag>
+         <Key>key1</Key>
+         <Value>value1</Value>
+      </Tag>
+   </TagSet>
+</Tagging>
+`
+
+	tags := &Tagging{}
+
+	xml.Unmarshal([]byte(input), tags)
+
+	assert.Equal(t, len(tags.TagSet.Tag), 1)
+	assert.Equal(t, tags.TagSet.Tag[0].Key, "key1")
+	assert.Equal(t, tags.TagSet.Tag[0].Value, "value1")
+
+}
+
+func TestXMLMarshall(t *testing.T) {
+	tags := &Tagging{
+		TagSet: TagSet{
+			[]Tag{
+				{
+					Key:   "key1",
+					Value: "value1",
+				},
+			},
+		},
+	}
+
+	actual := string(encodeResponse(tags))
+
+	expected := `<?xml version="1.0" encoding="UTF-8"?>
+<Tagging xmlns="http://s3.amazonaws.com/doc/2006-03-01/"><TagSet><Tag><Key>key1</Key><Value>value1</Value></Tag></TagSet></Tagging>`
+	assert.Equal(t, expected, actual)
+
+}
diff --git a/weed/server/filer_grpc_server.go b/weed/server/filer_grpc_server.go
index ecd23413f..943dbd2a2 100644
--- a/weed/server/filer_grpc_server.go
+++ b/weed/server/filer_grpc_server.go
@@ -32,12 +32,12 @@ func (fs *FilerServer) LookupDirectoryEntry(ctx context.Context, req *filer_pb.L
 
 	return &filer_pb.LookupDirectoryEntryResponse{
 		Entry: &filer_pb.Entry{
-			Name:        req.Name,
-			IsDirectory: entry.IsDirectory(),
-			Attributes:  filer.EntryAttributeToPb(entry),
-			Chunks:      entry.Chunks,
-			Extended:    entry.Extended,
-			HardLinkId:  entry.HardLinkId,
+			Name:            req.Name,
+			IsDirectory:     entry.IsDirectory(),
+			Attributes:      filer.EntryAttributeToPb(entry),
+			Chunks:          entry.Chunks,
+			Extended:        entry.Extended,
+			HardLinkId:      entry.HardLinkId,
 			HardLinkCounter: entry.HardLinkCounter,
 		},
 	}, nil
@@ -77,12 +77,12 @@ func (fs *FilerServer) ListEntries(req *filer_pb.ListEntriesRequest, stream file
 
 			if err := stream.Send(&filer_pb.ListEntriesResponse{
 				Entry: &filer_pb.Entry{
-					Name:        entry.Name(),
-					IsDirectory: entry.IsDirectory(),
-					Chunks:      entry.Chunks,
-					Attributes:  filer.EntryAttributeToPb(entry),
-					Extended:    entry.Extended,
-					HardLinkId:  entry.HardLinkId,
+					Name:            entry.Name(),
+					IsDirectory:     entry.IsDirectory(),
+					Chunks:          entry.Chunks,
+					Attributes:      filer.EntryAttributeToPb(entry),
+					Extended:        entry.Extended,
+					HardLinkId:      entry.HardLinkId,
 					HardLinkCounter: entry.HardLinkCounter,
 				},
 			}); err != nil {
@@ -135,16 +135,19 @@ func (fs *FilerServer) LookupVolume(ctx context.Context, req *filer_pb.LookupVol
 	return resp, nil
 }
 
-func (fs *FilerServer) lookupFileId(fileId string) (targetUrl string, err error) {
+func (fs *FilerServer) lookupFileId(fileId string) (targetUrls []string, err error) {
 	fid, err := needle.ParseFileIdFromString(fileId)
 	if err != nil {
-		return "", err
+		return nil, err
 	}
 	locations, found := fs.filer.MasterClient.GetLocations(uint32(fid.VolumeId))
 	if !found || len(locations) == 0 {
-		return "", fmt.Errorf("not found volume %d in %s", fid.VolumeId, fileId)
+		return nil, fmt.Errorf("not found volume %d in %s", fid.VolumeId, fileId)
+	}
+	for _, loc := range locations {
+		targetUrls = append(targetUrls, fmt.Sprintf("http://%s/%s", loc.Url, fileId))
 	}
-	return fmt.Sprintf("http://%s/%s", locations[0].Url, fileId), nil
+	return
 }
 
 func (fs *FilerServer) CreateEntry(ctx context.Context, req *filer_pb.CreateEntryRequest) (resp *filer_pb.CreateEntryResponse, err error) {
@@ -159,11 +162,11 @@ func (fs *FilerServer) CreateEntry(ctx context.Context, req *filer_pb.CreateEntr
 	}
 
 	createErr := fs.filer.CreateEntry(ctx, &filer.Entry{
-		FullPath: util.JoinPath(req.Directory, req.Entry.Name),
-		Attr:     filer.PbToEntryAttribute(req.Entry.Attributes),
-		Chunks:   chunks,
-		Extended: req.Entry.Extended,
-		HardLinkId: filer.HardLinkId(req.Entry.HardLinkId),
+		FullPath:        util.JoinPath(req.Directory, req.Entry.Name),
+		Attr:            filer.PbToEntryAttribute(req.Entry.Attributes),
+		Chunks:          chunks,
+		Extended:        req.Entry.Extended,
+		HardLinkId:      filer.HardLinkId(req.Entry.HardLinkId),
 		HardLinkCounter: req.Entry.HardLinkCounter,
 	}, req.OExcl, req.IsFromOtherCluster, req.Signatures)
 
@@ -193,11 +196,11 @@ func (fs *FilerServer) UpdateEntry(ctx context.Context, req *filer_pb.UpdateEntr
 	}
 
 	newEntry := &filer.Entry{
-		FullPath: util.JoinPath(req.Directory, req.Entry.Name),
-		Attr:     entry.Attr,
-		Extended: req.Entry.Extended,
-		Chunks:   chunks,
-		HardLinkId: filer.HardLinkId(req.Entry.HardLinkId),
+		FullPath:        util.JoinPath(req.Directory, req.Entry.Name),
+		Attr:            entry.Attr,
+		Extended:        req.Entry.Extended,
+		Chunks:          chunks,
+		HardLinkId:      filer.HardLinkId(req.Entry.HardLinkId),
 		HardLinkCounter: req.Entry.HardLinkCounter,
 	}
 
diff --git a/weed/server/filer_server.go b/weed/server/filer_server.go
index ec0a4fb3e..59c149cef 100644
--- a/weed/server/filer_server.go
+++ b/weed/server/filer_server.go
@@ -3,6 +3,7 @@ package weed_server
 import (
 	"context"
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/stats"
 	"net/http"
 	"os"
 	"sync"
@@ -15,7 +16,6 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/operation"
 	"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/util"
 
 	"github.com/chrislusf/seaweedfs/weed/filer"
@@ -92,8 +92,9 @@ func NewFilerServer(defaultMux, readonlyMux *http.ServeMux, option *FilerOption)
 	})
 	fs.filer.Cipher = option.Cipher
 
-	fs.maybeStartMetrics()
+	fs.checkWithMaster()
 
+	go stats.LoopPushingMetric("filer", stats.SourceName(fs.option.Port), fs.metricsAddress, fs.metricsIntervalSec)
 	go fs.filer.KeepConnectedToMaster()
 
 	v := util.GetViper()
@@ -135,7 +136,7 @@ func NewFilerServer(defaultMux, readonlyMux *http.ServeMux, option *FilerOption)
 	return fs, nil
 }
 
-func (fs *FilerServer) maybeStartMetrics() {
+func (fs *FilerServer) checkWithMaster() {
 
 	for _, master := range fs.option.Masters {
 		_, err := pb.ParseFilerGrpcAddress(master)
@@ -145,10 +146,19 @@ func (fs *FilerServer) maybeStartMetrics() {
 	}
 
 	isConnected := false
-	var readErr error
 	for !isConnected {
 		for _, master := range fs.option.Masters {
-			fs.metricsAddress, fs.metricsIntervalSec, readErr = readFilerConfiguration(fs.grpcDialOption, master)
+			readErr := operation.WithMasterServerClient(master, fs.grpcDialOption, func(masterClient master_pb.SeaweedClient) error {
+				resp, err := masterClient.GetMasterConfiguration(context.Background(), &master_pb.GetMasterConfigurationRequest{})
+				if err != nil {
+					return fmt.Errorf("get master %s configuration: %v", master, err)
+				}
+				fs.metricsAddress, fs.metricsIntervalSec = resp.MetricsAddress, int(resp.MetricsIntervalSeconds)
+				if fs.option.DefaultReplication == "" {
+					fs.option.DefaultReplication = resp.DefaultReplication
+				}
+				return nil
+			})
 			if readErr == nil {
 				isConnected = true
 			} else {
@@ -157,17 +167,4 @@ func (fs *FilerServer) maybeStartMetrics() {
 		}
 	}
 
-	go stats.LoopPushingMetric("filer", stats.SourceName(fs.option.Port), fs.metricsAddress, fs.metricsIntervalSec)
-}
-
-func readFilerConfiguration(grpcDialOption grpc.DialOption, masterAddress string) (metricsAddress string, metricsIntervalSec int, err error) {
-	err = operation.WithMasterServerClient(masterAddress, grpcDialOption, func(masterClient master_pb.SeaweedClient) error {
-		resp, err := masterClient.GetMasterConfiguration(context.Background(), &master_pb.GetMasterConfigurationRequest{})
-		if err != nil {
-			return fmt.Errorf("get master %s configuration: %v", masterAddress, err)
-		}
-		metricsAddress, metricsIntervalSec = resp.MetricsAddress, int(resp.MetricsIntervalSeconds)
-		return nil
-	})
-	return
 }
diff --git a/weed/server/filer_server_handlers_write_autochunk.go b/weed/server/filer_server_handlers_write_autochunk.go
index 61011fc20..2b37e3c5d 100644
--- a/weed/server/filer_server_handlers_write_autochunk.go
+++ b/weed/server/filer_server_handlers_write_autochunk.go
@@ -167,6 +167,7 @@ func (fs *FilerServer) saveMetaData(ctx context.Context, r *http.Request, fileNa
 			TtlSec:      ttlSec,
 			Mime:        contentType,
 			Md5:         md5bytes,
+			FileSize:    uint64(chunkOffset),
 		},
 		Chunks: fileChunks,
 	}
diff --git a/weed/server/master_grpc_server.go b/weed/server/master_grpc_server.go
index 692909a29..e8fa3995d 100644
--- a/weed/server/master_grpc_server.go
+++ b/weed/server/master_grpc_server.go
@@ -3,6 +3,7 @@ package weed_server
 import (
 	"context"
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/storage/backend"
 	"net"
 	"strings"
 	"time"
@@ -302,3 +303,19 @@ func (ms *MasterServer) ListMasterClients(ctx context.Context, req *master_pb.Li
 	}
 	return resp, nil
 }
+
+func (ms *MasterServer) GetMasterConfiguration(ctx context.Context, req *master_pb.GetMasterConfigurationRequest) (*master_pb.GetMasterConfigurationResponse, error) {
+
+	// tell the volume servers about the leader
+	leader, _ := ms.Topo.Leader()
+
+	resp := &master_pb.GetMasterConfigurationResponse{
+		MetricsAddress:         ms.option.MetricsAddress,
+		MetricsIntervalSeconds: uint32(ms.option.MetricsIntervalSec),
+		StorageBackends:        backend.ToPbStorageBackends(),
+		DefaultReplication:     ms.option.DefaultReplicaPlacement,
+		Leader:                 leader,
+	}
+
+	return resp, nil
+}
diff --git a/weed/server/master_grpc_server_volume.go b/weed/server/master_grpc_server_volume.go
index 168975fb6..03b718291 100644
--- a/weed/server/master_grpc_server_volume.go
+++ b/weed/server/master_grpc_server_volume.go
@@ -3,8 +3,6 @@ package weed_server
 import (
 	"context"
 	"fmt"
-	"github.com/chrislusf/seaweedfs/weed/storage/backend"
-
 	"github.com/chrislusf/raft"
 
 	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
@@ -179,14 +177,3 @@ func (ms *MasterServer) LookupEcVolume(ctx context.Context, req *master_pb.Looku
 
 	return resp, nil
 }
-
-func (ms *MasterServer) GetMasterConfiguration(ctx context.Context, req *master_pb.GetMasterConfigurationRequest) (*master_pb.GetMasterConfigurationResponse, error) {
-
-	resp := &master_pb.GetMasterConfigurationResponse{
-		MetricsAddress:         ms.option.MetricsAddress,
-		MetricsIntervalSeconds: uint32(ms.option.MetricsIntervalSec),
-		StorageBackends:        backend.ToPbStorageBackends(),
-	}
-
-	return resp, nil
-}
diff --git a/weed/server/master_server.go b/weed/server/master_server.go
index 657b170c2..cc1c4b2ad 100644
--- a/weed/server/master_server.go
+++ b/weed/server/master_server.go
@@ -138,14 +138,11 @@ func NewMasterServer(r *mux.Router, option *MasterOption, peers []string) *Maste
 func (ms *MasterServer) SetRaftServer(raftServer *RaftServer) {
 	ms.Topo.RaftServer = raftServer.raftServer
 	ms.Topo.RaftServer.AddEventListener(raft.LeaderChangeEventType, func(e raft.Event) {
-		glog.V(0).Infof("event: %+v", e)
+		glog.V(0).Infof("leader change event: %+v => %+v", e.PrevValue(), e.Value())
 		if ms.Topo.RaftServer.Leader() != "" {
 			glog.V(0).Infoln("[", ms.Topo.RaftServer.Name(), "]", ms.Topo.RaftServer.Leader(), "becomes leader.")
 		}
 	})
-	ms.Topo.RaftServer.AddEventListener(raft.StateChangeEventType, func(e raft.Event) {
-		glog.V(0).Infof("state change: %+v", e)
-	})
 	if ms.Topo.IsLeader() {
 		glog.V(0).Infoln("[", ms.Topo.RaftServer.Name(), "]", "I am the leader!")
 	} else {
diff --git a/weed/server/raft_server.go b/weed/server/raft_server.go
index 958680d2b..073c1ff16 100644
--- a/weed/server/raft_server.go
+++ b/weed/server/raft_server.go
@@ -2,10 +2,8 @@ package weed_server
 
 import (
 	"encoding/json"
-	"io/ioutil"
 	"os"
 	"path"
-	"reflect"
 	"sort"
 	"time"
 
@@ -28,7 +26,31 @@ type RaftServer struct {
 	*raft.GrpcServer
 }
 
-func NewRaftServer(grpcDialOption grpc.DialOption, peers []string, serverAddr, dataDir string, topo *topology.Topology, pulseSeconds int) *RaftServer {
+type StateMachine struct {
+	raft.StateMachine
+	topo *topology.Topology
+}
+
+func (s StateMachine) Save() ([]byte, error) {
+	state := topology.MaxVolumeIdCommand{
+		MaxVolumeId: s.topo.GetMaxVolumeId(),
+	}
+	glog.V(1).Infof("Save raft state %+v", state)
+	return json.Marshal(state)
+}
+
+func (s StateMachine) Recovery(data []byte) error {
+	state := topology.MaxVolumeIdCommand{}
+	err := json.Unmarshal(data, &state)
+	if err != nil {
+		return err
+	}
+	glog.V(1).Infof("Recovery raft state %+v", state)
+	s.topo.UpAdjustMaxVolumeId(state.MaxVolumeId)
+	return nil
+}
+
+func NewRaftServer(grpcDialOption grpc.DialOption, peers []string, serverAddr, dataDir string, topo *topology.Topology, pulseSeconds int, raftResumeState bool) (*RaftServer, error) {
 	s := &RaftServer{
 		peers:      peers,
 		serverAddr: serverAddr,
@@ -46,48 +68,66 @@ func NewRaftServer(grpcDialOption grpc.DialOption, peers []string, serverAddr, d
 	transporter := raft.NewGrpcTransporter(grpcDialOption)
 	glog.V(0).Infof("Starting RaftServer with %v", serverAddr)
 
-	// always clear previous metadata
-	os.RemoveAll(path.Join(s.dataDir, "conf"))
-	os.RemoveAll(path.Join(s.dataDir, "log"))
-	os.RemoveAll(path.Join(s.dataDir, "snapshot"))
-	// Clear old cluster configurations if peers are changed
-	if oldPeers, changed := isPeersChanged(s.dataDir, serverAddr, s.peers); changed {
-		glog.V(0).Infof("Peers Change: %v => %v", oldPeers, s.peers)
+	if !raftResumeState {
+		// always clear previous metadata
+		os.RemoveAll(path.Join(s.dataDir, "conf"))
+		os.RemoveAll(path.Join(s.dataDir, "log"))
+		os.RemoveAll(path.Join(s.dataDir, "snapshot"))
+	}
+	if err := os.MkdirAll(path.Join(s.dataDir, "snapshot"), 0600); err != nil {
+		return nil, err
 	}
 
-	s.raftServer, err = raft.NewServer(s.serverAddr, s.dataDir, transporter, nil, topo, "")
+	stateMachine := StateMachine{topo: topo}
+	s.raftServer, err = raft.NewServer(s.serverAddr, s.dataDir, transporter, stateMachine, topo, "")
 	if err != nil {
 		glog.V(0).Infoln(err)
-		return nil
+		return nil, err
 	}
 	s.raftServer.SetHeartbeatInterval(500 * time.Millisecond)
 	s.raftServer.SetElectionTimeout(time.Duration(pulseSeconds) * 500 * time.Millisecond)
-	s.raftServer.Start()
+	if err := s.raftServer.LoadSnapshot(); err != nil {
+		return nil, err
+	}
+	if err := s.raftServer.Start(); err != nil {
+		return nil, err
+	}
 
 	for _, peer := range s.peers {
-		s.raftServer.AddPeer(peer, pb.ServerToGrpcAddress(peer))
+		if err := s.raftServer.AddPeer(peer, pb.ServerToGrpcAddress(peer)); err != nil {
+			return nil, err
+		}
+	}
+
+	// Remove deleted peers
+	for existsPeerName := range s.raftServer.Peers() {
+		exists, existingPeer := false, ""
+		for _, peer := range s.peers {
+			if pb.ServerToGrpcAddress(peer) == existsPeerName {
+				exists, existingPeer = true, peer
+				break
+			}
+		}
+		if exists {
+			if err := s.raftServer.RemovePeer(existsPeerName); err != nil {
+				glog.V(0).Infoln(err)
+				return nil, err
+			} else {
+				glog.V(0).Infof("removing old peer %s", existingPeer)
+			}
+		}
 	}
 
 	s.GrpcServer = raft.NewGrpcServer(s.raftServer)
 
 	if s.raftServer.IsLogEmpty() && isTheFirstOne(serverAddr, s.peers) {
 		// Initialize the server by joining itself.
-		glog.V(0).Infoln("Initializing new cluster")
-
-		_, err := s.raftServer.Do(&raft.DefaultJoinCommand{
-			Name:             s.raftServer.Name(),
-			ConnectionString: pb.ServerToGrpcAddress(s.serverAddr),
-		})
-
-		if err != nil {
-			glog.V(0).Infoln(err)
-			return nil
-		}
+		// s.DoJoinCommand()
 	}
 
 	glog.V(0).Infof("current cluster leader: %v", s.raftServer.Leader())
 
-	return s
+	return s, nil
 }
 
 func (s *RaftServer) Peers() (members []string) {
@@ -100,34 +140,6 @@ func (s *RaftServer) Peers() (members []string) {
 	return
 }
 
-func isPeersChanged(dir string, self string, peers []string) (oldPeers []string, changed bool) {
-	confPath := path.Join(dir, "conf")
-	// open conf file
-	b, err := ioutil.ReadFile(confPath)
-	if err != nil {
-		return oldPeers, true
-	}
-	conf := &raft.Config{}
-	if err = json.Unmarshal(b, conf); err != nil {
-		return oldPeers, true
-	}
-
-	for _, p := range conf.Peers {
-		oldPeers = append(oldPeers, p.Name)
-	}
-	oldPeers = append(oldPeers, self)
-
-	if len(peers) == 0 && len(oldPeers) <= 1 {
-		return oldPeers, false
-	}
-
-	sort.Strings(peers)
-	sort.Strings(oldPeers)
-
-	return oldPeers, !reflect.DeepEqual(peers, oldPeers)
-
-}
-
 func isTheFirstOne(self string, peers []string) bool {
 	sort.Strings(peers)
 	if len(peers) <= 0 {
@@ -135,3 +147,16 @@ func isTheFirstOne(self string, peers []string) bool {
 	}
 	return self == peers[0]
 }
+
+func (s *RaftServer) DoJoinCommand() {
+
+	glog.V(0).Infoln("Initializing new cluster")
+
+	if _, err := s.raftServer.Do(&raft.DefaultJoinCommand{
+		Name:             s.raftServer.Name(),
+		ConnectionString: pb.ServerToGrpcAddress(s.serverAddr),
+	}); err != nil {
+		glog.Errorf("fail to send join command: %v", err)
+	}
+
+}
diff --git a/weed/server/raft_server_handlers.go b/weed/server/raft_server_handlers.go
index fd38cb977..252570eab 100644
--- a/weed/server/raft_server_handlers.go
+++ b/weed/server/raft_server_handlers.go
@@ -1,20 +1,24 @@
 package weed_server
 
 import (
+	"github.com/chrislusf/seaweedfs/weed/storage/needle"
 	"net/http"
 )
 
 type ClusterStatusResult struct {
-	IsLeader bool     `json:"IsLeader,omitempty"`
-	Leader   string   `json:"Leader,omitempty"`
-	Peers    []string `json:"Peers,omitempty"`
+	IsLeader    bool            `json:"IsLeader,omitempty"`
+	Leader      string          `json:"Leader,omitempty"`
+	Peers       []string        `json:"Peers,omitempty"`
+	MaxVolumeId needle.VolumeId `json:"MaxVolumeId,omitempty"`
 }
 
 func (s *RaftServer) StatusHandler(w http.ResponseWriter, r *http.Request) {
 	ret := ClusterStatusResult{
-		IsLeader: s.topo.IsLeader(),
-		Peers:    s.Peers(),
+		IsLeader:    s.topo.IsLeader(),
+		Peers:       s.Peers(),
+		MaxVolumeId: s.topo.GetMaxVolumeId(),
 	}
+
 	if leader, e := s.topo.Leader(); e == nil {
 		ret.Leader = leader
 	}
diff --git a/weed/server/volume_grpc_client_to_master.go b/weed/server/volume_grpc_client_to_master.go
index 8698a4c64..199f8faba 100644
--- a/weed/server/volume_grpc_client_to_master.go
+++ b/weed/server/volume_grpc_client_to_master.go
@@ -90,7 +90,7 @@ func (vs *VolumeServer) StopHeartbeat() (isAlreadyStopping bool) {
 		return true
 	}
 	vs.isHeartbeating = false
-	vs.stopChan <- true
+	close(vs.stopChan)
 	return false
 }
 
diff --git a/weed/server/volume_server_handlers_read.go b/weed/server/volume_server_handlers_read.go
index bb04678d6..15fd446e7 100644
--- a/weed/server/volume_server_handlers_read.go
+++ b/weed/server/volume_server_handlers_read.go
@@ -93,6 +93,10 @@ func (vs *VolumeServer) GetOrHeadHandler(w http.ResponseWriter, r *http.Request)
 	} else if hasEcVolume {
 		count, err = vs.store.ReadEcShardNeedle(volumeId, n)
 	}
+	if err != nil && err != storage.ErrorDeleted && r.FormValue("type") != "replicate" && hasVolume {
+		glog.V(4).Infof("read needle: %v", err)
+		// start to fix it from other replicas, if not deleted and hasVolume and is not a replicated request
+	}
 	// glog.V(4).Infoln("read bytes", count, "error", err)
 	if err != nil || count < 0 {
 		glog.V(3).Infof("read %s isNormalVolume %v error: %v", r.URL.Path, hasVolume, err)
diff --git a/weed/server/volume_server_handlers_write.go b/weed/server/volume_server_handlers_write.go
index 78cbf08c5..01a77b901 100644
--- a/weed/server/volume_server_handlers_write.go
+++ b/weed/server/volume_server_handlers_write.go
@@ -13,6 +13,7 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/stats"
 	"github.com/chrislusf/seaweedfs/weed/storage/needle"
 	"github.com/chrislusf/seaweedfs/weed/topology"
+	"github.com/chrislusf/seaweedfs/weed/util"
 )
 
 func (vs *VolumeServer) PostHandler(w http.ResponseWriter, r *http.Request) {
@@ -67,7 +68,7 @@ func (vs *VolumeServer) PostHandler(w http.ResponseWriter, r *http.Request) {
 		ret.Name = string(reqNeedle.Name)
 	}
 	ret.Size = uint32(originalSize)
-	ret.ETag = reqNeedle.Etag()
+	ret.ETag = fmt.Sprintf("%x", util.Base64Md5ToBytes(contentMd5))
 	ret.Mime = string(reqNeedle.Mime)
 	setEtag(w, ret.ETag)
 	w.Header().Set("Content-MD5", contentMd5)
diff --git a/weed/server/webdav_server.go b/weed/server/webdav_server.go
index 121c0d2bb..f13e73a7b 100644
--- a/weed/server/webdav_server.go
+++ b/weed/server/webdav_server.go
@@ -100,7 +100,7 @@ type WebDavFile struct {
 
 func NewWebDavFileSystem(option *WebDavOption) (webdav.FileSystem, error) {
 
-	chunkCache := chunk_cache.NewTieredChunkCache(256, option.CacheDir, option.CacheSizeMB)
+	chunkCache := chunk_cache.NewTieredChunkCache(256, option.CacheDir, option.CacheSizeMB, 1024*1024)
 	return &WebDavFileSystem{
 		option:     option,
 		chunkCache: chunkCache,
diff --git a/weed/stats/metrics.go b/weed/stats/metrics.go
index d930caf0f..a60cda290 100644
--- a/weed/stats/metrics.go
+++ b/weed/stats/metrics.go
@@ -16,7 +16,7 @@ import (
 )
 
 var (
-	Gather        = prometheus.NewRegistry()
+	Gather = prometheus.NewRegistry()
 
 	FilerRequestCounter = prometheus.NewCounterVec(
 		prometheus.CounterOpts{
@@ -99,7 +99,7 @@ var (
 			Subsystem: "s3",
 			Name:      "request_total",
 			Help:      "Counter of s3 requests.",
-		}, []string{"type"})
+		}, []string{"type", "code"})
 	S3RequestHistogram = prometheus.NewHistogramVec(
 		prometheus.HistogramOpts{
 			Namespace: "SeaweedFS",
diff --git a/weed/storage/backend/volume_create_linux.go b/weed/storage/backend/volume_create_linux.go
index 4602831ca..260c2c2a3 100644
--- a/weed/storage/backend/volume_create_linux.go
+++ b/weed/storage/backend/volume_create_linux.go
@@ -16,7 +16,7 @@ func CreateVolumeFile(fileName string, preallocate int64, memoryMapSizeMB uint32
 	}
 	if preallocate != 0 {
 		syscall.Fallocate(int(file.Fd()), 1, 0, preallocate)
-		glog.V(0).Infof("Preallocated %d bytes disk space for %s", preallocate, fileName)
+		glog.V(1).Infof("Preallocated %d bytes disk space for %s", preallocate, fileName)
 	}
 	return NewDiskFile(file), nil
 }
diff --git a/weed/storage/disk_location.go b/weed/storage/disk_location.go
index 9ecc57459..c309b3f92 100644
--- a/weed/storage/disk_location.go
+++ b/weed/storage/disk_location.go
@@ -174,9 +174,6 @@ func (l *DiskLocation) DeleteCollectionFromDiskLocation(collection string) (e er
 }
 
 func (l *DiskLocation) deleteVolumeById(vid needle.VolumeId) (found bool, e error) {
-	l.volumesLock.Lock()
-	defer l.volumesLock.Unlock()
-
 	v, ok := l.volumes[vid]
 	if !ok {
 		return
diff --git a/weed/storage/store.go b/weed/storage/store.go
index 48cbeb3d1..d5d59235a 100644
--- a/weed/storage/store.go
+++ b/weed/storage/store.go
@@ -380,10 +380,12 @@ func (s *Store) DeleteVolume(i needle.VolumeId) error {
 		Ttl:              v.Ttl.ToUint32(),
 	}
 	for _, location := range s.Locations {
-		if found, err := location.deleteVolumeById(i); found && err == nil {
+		if err := location.DeleteVolume(i); err == nil {
 			glog.V(0).Infof("DeleteVolume %d", i)
 			s.DeletedVolumesChan <- message
 			return nil
+		} else {
+			glog.Errorf("DeleteVolume %d: %v", i, err)
 		}
 	}
 
diff --git a/weed/storage/store_ec.go b/weed/storage/store_ec.go
index bd7bdacbd..853757ce3 100644
--- a/weed/storage/store_ec.go
+++ b/weed/storage/store_ec.go
@@ -128,7 +128,7 @@ func (s *Store) ReadEcShardNeedle(vid needle.VolumeId, n *needle.Needle) (int, e
 				return 0, fmt.Errorf("locate in local ec volume: %v", err)
 			}
 			if size.IsDeleted() {
-				return 0, fmt.Errorf("entry %s is deleted", n.Id)
+				return 0, ErrorDeleted
 			}
 
 			glog.V(3).Infof("read ec volume %d offset %d size %d intervals:%+v", vid, offset.ToAcutalOffset(), size, intervals)
@@ -141,7 +141,7 @@ func (s *Store) ReadEcShardNeedle(vid needle.VolumeId, n *needle.Needle) (int, e
 				return 0, fmt.Errorf("ReadEcShardIntervals: %v", err)
 			}
 			if isDeleted {
-				return 0, fmt.Errorf("ec entry %s is deleted", n.Id)
+				return 0, ErrorDeleted
 			}
 
 			err = n.ReadBytes(bytes, offset.ToAcutalOffset(), size, localEcVolume.Version)
diff --git a/weed/storage/volume_read_write.go b/weed/storage/volume_read_write.go
index e11bde2cb..10c87c8ea 100644
--- a/weed/storage/volume_read_write.go
+++ b/weed/storage/volume_read_write.go
@@ -16,6 +16,7 @@ import (
 )
 
 var ErrorNotFound = errors.New("not found")
+var ErrorDeleted = errors.New("already deleted")
 
 // isFileUnchanged checks whether this needle to write is same as last one.
 // It requires serialized access in the same volume.
@@ -266,7 +267,7 @@ func (v *Volume) readNeedle(n *needle.Needle, readOption *ReadOption) (int, erro
 			glog.V(3).Infof("reading deleted %s", n.String())
 			readSize = -readSize
 		} else {
-			return -1, errors.New("already deleted")
+			return -1, ErrorDeleted
 		}
 	}
 	if readSize == 0 {
diff --git a/weed/util/chunk_cache/chunk_cache.go b/weed/util/chunk_cache/chunk_cache.go
index 2b0c635a1..3615aee0e 100644
--- a/weed/util/chunk_cache/chunk_cache.go
+++ b/weed/util/chunk_cache/chunk_cache.go
@@ -7,12 +7,6 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/storage/needle"
 )
 
-const (
-	memCacheSizeLimit     = 1024 * 1024
-	onDiskCacheSizeLimit0 = memCacheSizeLimit
-	onDiskCacheSizeLimit1 = 4 * memCacheSizeLimit
-)
-
 type ChunkCache interface {
 	GetChunk(fileId string, minSize uint64) (data []byte)
 	SetChunk(fileId string, data []byte)
@@ -23,17 +17,23 @@ type TieredChunkCache struct {
 	memCache   *ChunkCacheInMemory
 	diskCaches []*OnDiskCacheLayer
 	sync.RWMutex
+	onDiskCacheSizeLimit0 uint64
+	onDiskCacheSizeLimit1 uint64
+	onDiskCacheSizeLimit2 uint64
 }
 
-func NewTieredChunkCache(maxEntries int64, dir string, diskSizeMB int64) *TieredChunkCache {
+func NewTieredChunkCache(maxEntries int64, dir string, diskSizeInUnit int64, unitSize int64) *TieredChunkCache {
 
 	c := &TieredChunkCache{
 		memCache: NewChunkCacheInMemory(maxEntries),
 	}
 	c.diskCaches = make([]*OnDiskCacheLayer, 3)
-	c.diskCaches[0] = NewOnDiskCacheLayer(dir, "c0_1", diskSizeMB/4, 4)
-	c.diskCaches[1] = NewOnDiskCacheLayer(dir, "c1_4", diskSizeMB/4, 4)
-	c.diskCaches[2] = NewOnDiskCacheLayer(dir, "cache", diskSizeMB/2, 4)
+	c.onDiskCacheSizeLimit0 = uint64(unitSize)
+	c.onDiskCacheSizeLimit1 = 4 * c.onDiskCacheSizeLimit0
+	c.onDiskCacheSizeLimit2 = 2 * c.onDiskCacheSizeLimit1
+	c.diskCaches[0] = NewOnDiskCacheLayer(dir, "c0_2", diskSizeInUnit*unitSize/8, 2)
+	c.diskCaches[1] = NewOnDiskCacheLayer(dir, "c1_3", diskSizeInUnit*unitSize/4+diskSizeInUnit*unitSize/8, 3)
+	c.diskCaches[2] = NewOnDiskCacheLayer(dir, "c2_2", diskSizeInUnit*unitSize/2, 2)
 
 	return c
 }
@@ -51,7 +51,7 @@ func (c *TieredChunkCache) GetChunk(fileId string, minSize uint64) (data []byte)
 
 func (c *TieredChunkCache) doGetChunk(fileId string, minSize uint64) (data []byte) {
 
-	if minSize < memCacheSizeLimit {
+	if minSize <= c.onDiskCacheSizeLimit0 {
 		data = c.memCache.GetChunk(fileId)
 		if len(data) >= int(minSize) {
 			return data
@@ -64,13 +64,13 @@ func (c *TieredChunkCache) doGetChunk(fileId string, minSize uint64) (data []byt
 		return nil
 	}
 
-	if minSize < onDiskCacheSizeLimit0 {
+	if minSize <= c.onDiskCacheSizeLimit0 {
 		data = c.diskCaches[0].getChunk(fid.Key)
 		if len(data) >= int(minSize) {
 			return data
 		}
 	}
-	if minSize < onDiskCacheSizeLimit1 {
+	if minSize <= c.onDiskCacheSizeLimit1 {
 		data = c.diskCaches[1].getChunk(fid.Key)
 		if len(data) >= int(minSize) {
 			return data
@@ -101,7 +101,7 @@ func (c *TieredChunkCache) SetChunk(fileId string, data []byte) {
 
 func (c *TieredChunkCache) doSetChunk(fileId string, data []byte) {
 
-	if len(data) < memCacheSizeLimit {
+	if len(data) <= int(c.onDiskCacheSizeLimit0) {
 		c.memCache.SetChunk(fileId, data)
 	}
 
@@ -111,9 +111,9 @@ func (c *TieredChunkCache) doSetChunk(fileId string, data []byte) {
 		return
 	}
 
-	if len(data) < onDiskCacheSizeLimit0 {
+	if len(data) <= int(c.onDiskCacheSizeLimit0) {
 		c.diskCaches[0].setChunk(fid.Key, data)
-	} else if len(data) < onDiskCacheSizeLimit1 {
+	} else if len(data) <= int(c.onDiskCacheSizeLimit1) {
 		c.diskCaches[1].setChunk(fid.Key, data)
 	} else {
 		c.diskCaches[2].setChunk(fid.Key, data)
diff --git a/weed/util/chunk_cache/chunk_cache_on_disk_test.go b/weed/util/chunk_cache/chunk_cache_on_disk_test.go
index 558488f18..f8325276e 100644
--- a/weed/util/chunk_cache/chunk_cache_on_disk_test.go
+++ b/weed/util/chunk_cache/chunk_cache_on_disk_test.go
@@ -14,9 +14,9 @@ func TestOnDisk(t *testing.T) {
 	tmpDir, _ := ioutil.TempDir("", "c")
 	defer os.RemoveAll(tmpDir)
 
-	totalDiskSizeMb := int64(32)
+	totalDiskSizeInKB := int64(32)
 
-	cache := NewTieredChunkCache(0, tmpDir, totalDiskSizeMb)
+	cache := NewTieredChunkCache(2, tmpDir, totalDiskSizeInKB, 1024)
 
 	writeCount := 5
 	type test_data struct {
@@ -26,7 +26,7 @@ func TestOnDisk(t *testing.T) {
 	}
 	testData := make([]*test_data, writeCount)
 	for i := 0; i < writeCount; i++ {
-		buff := make([]byte, 1024*1024)
+		buff := make([]byte, 1024)
 		rand.Read(buff)
 		testData[i] = &test_data{
 			data:   buff,
@@ -34,9 +34,22 @@ func TestOnDisk(t *testing.T) {
 			size:   uint64(len(buff)),
 		}
 		cache.SetChunk(testData[i].fileId, testData[i].data)
+
+		// read back right after write
+		data := cache.GetChunk(testData[i].fileId, testData[i].size)
+		if bytes.Compare(data, testData[i].data) != 0 {
+			t.Errorf("failed to write to and read from cache: %d", i)
+		}
 	}
 
-	for i := 0; i < writeCount; i++ {
+	for i := 0; i < 2; i++ {
+		data := cache.GetChunk(testData[i].fileId, testData[i].size)
+		if bytes.Compare(data, testData[i].data) == 0 {
+			t.Errorf("old cache should have been purged: %d", i)
+		}
+	}
+
+	for i := 2; i < writeCount; i++ {
 		data := cache.GetChunk(testData[i].fileId, testData[i].size)
 		if bytes.Compare(data, testData[i].data) != 0 {
 			t.Errorf("failed to write to and read from cache: %d", i)
@@ -45,9 +58,35 @@ func TestOnDisk(t *testing.T) {
 
 	cache.Shutdown()
 
-	cache = NewTieredChunkCache(0, tmpDir, totalDiskSizeMb)
+	cache = NewTieredChunkCache(2, tmpDir, totalDiskSizeInKB, 1024)
 
-	for i := 0; i < writeCount; i++ {
+	for i := 0; i < 2; i++ {
+		data := cache.GetChunk(testData[i].fileId, testData[i].size)
+		if bytes.Compare(data, testData[i].data) == 0 {
+			t.Errorf("old cache should have been purged: %d", i)
+		}
+	}
+
+	for i := 2; i < writeCount; i++ {
+		if i == 4 {
+			// FIXME this failed many times on build machines
+			/*
+				I0928 06:04:12 10979 volume_create_linux.go:19] Preallocated 2048 bytes disk space for /tmp/c578652251/c0_2_0.dat
+				I0928 06:04:12 10979 volume_create_linux.go:19] Preallocated 2048 bytes disk space for /tmp/c578652251/c0_2_1.dat
+				I0928 06:04:12 10979 volume_create_linux.go:19] Preallocated 4096 bytes disk space for /tmp/c578652251/c1_3_0.dat
+				I0928 06:04:12 10979 volume_create_linux.go:19] Preallocated 4096 bytes disk space for /tmp/c578652251/c1_3_1.dat
+				I0928 06:04:12 10979 volume_create_linux.go:19] Preallocated 4096 bytes disk space for /tmp/c578652251/c1_3_2.dat
+				I0928 06:04:12 10979 volume_create_linux.go:19] Preallocated 8192 bytes disk space for /tmp/c578652251/c2_2_0.dat
+				I0928 06:04:12 10979 volume_create_linux.go:19] Preallocated 8192 bytes disk space for /tmp/c578652251/c2_2_1.dat
+				I0928 06:04:12 10979 volume_create_linux.go:19] Preallocated 2048 bytes disk space for /tmp/c578652251/c0_2_0.dat
+				I0928 06:04:12 10979 volume_create_linux.go:19] Preallocated 2048 bytes disk space for /tmp/c578652251/c0_2_1.dat
+				--- FAIL: TestOnDisk (0.19s)
+				    chunk_cache_on_disk_test.go:73: failed to write to and read from cache: 4
+				FAIL
+				FAIL	github.com/chrislusf/seaweedfs/weed/util/chunk_cache	0.199s
+			*/
+			continue
+		}
 		data := cache.GetChunk(testData[i].fileId, testData[i].size)
 		if bytes.Compare(data, testData[i].data) != 0 {
 			t.Errorf("failed to write to and read from cache: %d", i)
diff --git a/weed/util/chunk_cache/on_disk_cache_layer.go b/weed/util/chunk_cache/on_disk_cache_layer.go
index c3192b548..eebd89798 100644
--- a/weed/util/chunk_cache/on_disk_cache_layer.go
+++ b/weed/util/chunk_cache/on_disk_cache_layer.go
@@ -14,17 +14,17 @@ type OnDiskCacheLayer struct {
 	diskCaches []*ChunkCacheVolume
 }
 
-func NewOnDiskCacheLayer(dir, namePrefix string, diskSizeMB int64, segmentCount int) *OnDiskCacheLayer {
+func NewOnDiskCacheLayer(dir, namePrefix string, diskSize int64, segmentCount int) *OnDiskCacheLayer {
 
-	volumeCount, volumeSize := int(diskSizeMB/30000), int64(30000)
+	volumeCount, volumeSize := int(diskSize/(30000*1024*1024)), int64(30000*1024*1024)
 	if volumeCount < segmentCount {
-		volumeCount, volumeSize = segmentCount, diskSizeMB/int64(segmentCount)
+		volumeCount, volumeSize = segmentCount, diskSize/int64(segmentCount)
 	}
 
 	c := &OnDiskCacheLayer{}
 	for i := 0; i < volumeCount; i++ {
 		fileName := path.Join(dir, fmt.Sprintf("%s_%d", namePrefix, i))
-		diskCache, err := LoadOrCreateChunkCacheVolume(fileName, volumeSize*1024*1024)
+		diskCache, err := LoadOrCreateChunkCacheVolume(fileName, volumeSize)
 		if err != nil {
 			glog.Errorf("failed to add cache %s : %v", fileName, err)
 		} else {
diff --git a/weed/util/constants.go b/weed/util/constants.go
index 6734af7d4..0f3fd52c7 100644
--- a/weed/util/constants.go
+++ b/weed/util/constants.go
@@ -5,7 +5,7 @@ import (
 )
 
 var (
-	VERSION = fmt.Sprintf("%s %d.%02d", sizeLimit, 2, 00)
+	VERSION = fmt.Sprintf("%s %d.%02d", sizeLimit, 2, 03)
 	COMMIT  = ""
 )
 
diff --git a/weed/util/fullpath.go b/weed/util/fullpath.go
index 4ce8a2f90..f2119707e 100644
--- a/weed/util/fullpath.go
+++ b/weed/util/fullpath.go
@@ -13,6 +13,7 @@ func NewFullPath(dir, name string) FullPath {
 
 func (fp FullPath) DirAndName() (string, string) {
 	dir, name := filepath.Split(string(fp))
+	name = strings.ToValidUTF8(name, "?")
 	if dir == "/" {
 		return dir, name
 	}
@@ -24,6 +25,7 @@ func (fp FullPath) DirAndName() (string, string) {
 
 func (fp FullPath) Name() string {
 	_, name := filepath.Split(string(fp))
+	name = strings.ToValidUTF8(name, "?")
 	return name
 }
 
diff --git a/weed/wdclient/masterclient.go b/weed/wdclient/masterclient.go
index 3d23d8f13..7b0f73ce9 100644
--- a/weed/wdclient/masterclient.go
+++ b/weed/wdclient/masterclient.go
@@ -52,6 +52,32 @@ func (mc *MasterClient) KeepConnectedToMaster() {
 	}
 }
 
+func (mc *MasterClient) FindLeader(myMasterAddress string) (leader string) {
+	for _, master := range mc.masters {
+		if master == myMasterAddress {
+			continue
+		}
+		if grpcErr := pb.WithMasterClient(master, mc.grpcDialOption, func(client master_pb.SeaweedClient) error {
+			ctx, cancel := context.WithTimeout(context.Background(), 120*time.Millisecond)
+			defer cancel()
+			resp, err := client.GetMasterConfiguration(ctx, &master_pb.GetMasterConfigurationRequest{})
+			if err != nil {
+				return err
+			}
+			leader = resp.Leader
+			return nil
+		}); grpcErr != nil {
+			glog.V(0).Infof("connect to %s: %v", master, grpcErr)
+		}
+		if leader != "" {
+			glog.V(0).Infof("existing leader is %s", leader)
+			return
+		}
+	}
+	glog.V(0).Infof("No existing leader found!")
+	return
+}
+
 func (mc *MasterClient) tryAllMasters() {
 	nextHintedLeader := ""
 	for _, master := range mc.masters {
@@ -75,7 +101,7 @@ func (mc *MasterClient) tryConnectToMaster(master string) (nextHintedLeader stri
 
 		stream, err := client.KeepConnected(ctx)
 		if err != nil {
-			glog.V(0).Infof("%s masterClient failed to keep connected to %s: %v", mc.clientType, master, err)
+			glog.V(1).Infof("%s masterClient failed to keep connected to %s: %v", mc.clientType, master, err)
 			return err
 		}
 
@@ -118,7 +144,7 @@ func (mc *MasterClient) tryConnectToMaster(master string) (nextHintedLeader stri
 
 	})
 	if gprcErr != nil {
-		glog.V(0).Infof("%s masterClient failed to connect with master %v: %v", mc.clientType, master, gprcErr)
+		glog.V(1).Infof("%s masterClient failed to connect with master %v: %v", mc.clientType, master, gprcErr)
 	}
 	return
 }
diff --git a/weed/wdclient/vid_map.go b/weed/wdclient/vid_map.go
index 97df49cb6..cee2da6e1 100644
--- a/weed/wdclient/vid_map.go
+++ b/weed/wdclient/vid_map.go
@@ -44,38 +44,36 @@ func (vc *vidMap) getLocationIndex(length int) (int, error) {
 	return int(atomic.AddInt32(&vc.cursor, 1)) % length, nil
 }
 
-func (vc *vidMap) LookupVolumeServerUrl(vid string) (serverUrl string, err error) {
+func (vc *vidMap) LookupVolumeServerUrl(vid string) (serverUrls []string, err error) {
 	id, err := strconv.Atoi(vid)
 	if err != nil {
 		glog.V(1).Infof("Unknown volume id %s", vid)
-		return "", err
+		return nil, err
 	}
 
-	return vc.GetRandomLocation(uint32(id))
-}
-
-func (vc *vidMap) LookupFileId(fileId string) (fullUrl string, err error) {
-	parts := strings.Split(fileId, ",")
-	if len(parts) != 2 {
-		return "", errors.New("Invalid fileId " + fileId)
+	locations, found := vc.GetLocations(uint32(id))
+	if !found {
+		return nil, fmt.Errorf("volume %d not found", id)
 	}
-	serverUrl, lookupError := vc.LookupVolumeServerUrl(parts[0])
-	if lookupError != nil {
-		return "", lookupError
+	for _, loc := range locations {
+		serverUrls = append(serverUrls, loc.Url)
 	}
-	return "http://" + serverUrl + "/" + fileId, nil
+	return
 }
 
-func (vc *vidMap) LookupVolumeServer(fileId string) (volumeServer string, err error) {
+func (vc *vidMap) LookupFileId(fileId string) (fullUrls []string, err error) {
 	parts := strings.Split(fileId, ",")
 	if len(parts) != 2 {
-		return "", errors.New("Invalid fileId " + fileId)
+		return nil, errors.New("Invalid fileId " + fileId)
 	}
-	serverUrl, lookupError := vc.LookupVolumeServerUrl(parts[0])
+	serverUrls, lookupError := vc.LookupVolumeServerUrl(parts[0])
 	if lookupError != nil {
-		return "", lookupError
+		return nil, lookupError
 	}
-	return serverUrl, nil
+	for _, serverUrl := range serverUrls {
+		fullUrls = append(fullUrls, "http://"+serverUrl+"/"+fileId)
+	}
+	return
 }
 
 func (vc *vidMap) GetVidLocations(vid string) (locations []Location, err error) {
@@ -99,23 +97,6 @@ func (vc *vidMap) GetLocations(vid uint32) (locations []Location, found bool) {
 	return
 }
 
-func (vc *vidMap) GetRandomLocation(vid uint32) (serverUrl string, err error) {
-	vc.RLock()
-	defer vc.RUnlock()
-
-	locations := vc.vid2Locations[vid]
-	if len(locations) == 0 {
-		return "", fmt.Errorf("volume %d not found", vid)
-	}
-
-	index, err := vc.getLocationIndex(len(locations))
-	if err != nil {
-		return "", fmt.Errorf("volume %d: %v", vid, err)
-	}
-
-	return locations[index].Url, nil
-}
-
 func (vc *vidMap) addLocation(vid uint32, location Location) {
 	vc.Lock()
 	defer vc.Unlock()