Merge branch 'new_master' into hashicorp_raft

# Conflicts:
#	go.mod
#	go.sum

34 files changed, 2350 insertions, 1017 deletions

diff --git a/weed/cluster/cluster.go b/weed/cluster/cluster.go
index fa01bd03d..e8752f4d9 100644
--- a/weed/cluster/cluster.go
+++ b/weed/cluster/cluster.go
@@ -9,9 +9,10 @@ import (
 )
 
 const (
-	MasterType = "master"
-	FilerType  = "filer"
-	BrokerType = "broker"
+	MasterType       = "master"
+	VolumeServerType = "volumeServer"
+	FilerType        = "filer"
+	BrokerType       = "broker"
 )
 
 type ClusterNode struct {
diff --git a/weed/command/master.go b/weed/command/master.go
index e7113cd3e..37cfaf252 100644
--- a/weed/command/master.go
+++ b/weed/command/master.go
@@ -138,7 +138,7 @@ func startMaster(masterOption MasterOptions, masterWhiteList []string) {
 
 	masterPeers := make(map[string]pb.ServerAddress)
 	for _, peer := range peers {
-		masterPeers[peer.String()] = peer
+		masterPeers[string(peer)] = peer
 	}
 
 	r := mux.NewRouter()
diff --git a/weed/command/mount.go b/weed/command/mount.go
index 428e073f2..2569bc3dc 100644
--- a/weed/command/mount.go
+++ b/weed/command/mount.go
@@ -29,6 +29,7 @@ type MountOptions struct {
 	readOnly           *bool
 	debug              *bool
 	debugPort          *int
+	localSocket        *string
 }
 
 var (
@@ -63,6 +64,7 @@ func init() {
 	mountOptions.readOnly = cmdMount.Flag.Bool("readOnly", false, "read only")
 	mountOptions.debug = cmdMount.Flag.Bool("debug", false, "serves runtime profiling data, e.g., http://localhost:<debug.port>/debug/pprof/goroutine?debug=2")
 	mountOptions.debugPort = cmdMount.Flag.Int("debug.port", 6061, "http port for debugging")
+	mountOptions.localSocket = cmdMount.Flag.String("localSocket", "", "default to /tmp/seaweedfs-mount-<mount_dir_hash>.sock")
 
 	mountCpuProfile = cmdMount.Flag.String("cpuprofile", "", "cpu profile output file")
 	mountMemProfile = cmdMount.Flag.String("memprofile", "", "memory profile output file")
diff --git a/weed/command/mount_std.go b/weed/command/mount_std.go
index d865e053f..7926c9cdc 100644
--- a/weed/command/mount_std.go
+++ b/weed/command/mount_std.go
@@ -12,9 +12,12 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/mount/unmount"
 	"github.com/chrislusf/seaweedfs/weed/pb"
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/mount_pb"
 	"github.com/chrislusf/seaweedfs/weed/security"
 	"github.com/chrislusf/seaweedfs/weed/storage/types"
 	"github.com/hanwen/go-fuse/v2/fuse"
+	"google.golang.org/grpc/reflection"
+	"net"
 	"net/http"
 	"os"
 	"os/user"
@@ -98,6 +101,22 @@ func RunMount(option *MountOptions, umask os.FileMode) bool {
 
 	unmount.Unmount(dir)
 
+	// start on local unix socket
+	if *option.localSocket == "" {
+		mountDirHash := util.HashToInt32([]byte(dir))
+		if mountDirHash < 0 {
+			mountDirHash = -mountDirHash
+		}
+		*option.localSocket = fmt.Sprintf("/tmp/seaweefs-mount-%d.sock", mountDirHash)
+		if err := os.Remove(*option.localSocket); err != nil && !os.IsNotExist(err) {
+			glog.Fatalf("Failed to remove %s, error: %s", *option.localSocket, err.Error())
+		}
+	}
+	montSocketListener, err := net.Listen("unix", *option.localSocket)
+	if err != nil {
+		glog.Fatalf("Failed to listen on %s: %v", *option.localSocket, err)
+	}
+
 	// detect mount folder mode
 	if *option.dirAutoCreate {
 		os.MkdirAll(dir, os.FileMode(0777)&^umask)
@@ -229,6 +248,11 @@ func RunMount(option *MountOptions, umask os.FileMode) bool {
 		unmount.Unmount(dir)
 	})
 
+	grpcS := pb.NewGrpcServer()
+	mount_pb.RegisterSeaweedMountServer(grpcS, seaweedFileSystem)
+	reflection.Register(grpcS)
+	go grpcS.Serve(montSocketListener)
+
 	seaweedFileSystem.StartBackgroundTasks()
 
 	fmt.Printf("This is SeaweedFS version %s %s %s\n", util.Version(), runtime.GOOS, runtime.GOARCH)
diff --git a/weed/mount/page_writer/page_chunk_swapfile.go b/weed/mount/page_writer/page_chunk_swapfile.go
index c70f8c5a1..b56589bfc 100644
--- a/weed/mount/page_writer/page_chunk_swapfile.go
+++ b/weed/mount/page_writer/page_chunk_swapfile.go
@@ -5,6 +5,7 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/util"
 	"github.com/chrislusf/seaweedfs/weed/util/mem"
 	"os"
+	"sync"
 )
 
 var (
@@ -14,11 +15,12 @@ var (
 type ActualChunkIndex int
 
 type SwapFile struct {
-	dir                     string
-	file                    *os.File
-	logicToActualChunkIndex map[LogicChunkIndex]ActualChunkIndex
-	chunkSize               int64
-	freeActualChunkList     []ActualChunkIndex
+	dir                         string
+	file                        *os.File
+	logicToActualChunkIndex     map[LogicChunkIndex]ActualChunkIndex
+	logicToActualChunkIndexLock sync.Mutex
+	chunkSize                   int64
+	freeActualChunkList         []ActualChunkIndex
 }
 
 type SwapFileChunk struct {
@@ -52,6 +54,8 @@ func (sf *SwapFile) NewTempFileChunk(logicChunkIndex LogicChunkIndex) (tc *SwapF
 			return nil
 		}
 	}
+	sf.logicToActualChunkIndexLock.Lock()
+	defer sf.logicToActualChunkIndexLock.Unlock()
 	actualChunkIndex, found := sf.logicToActualChunkIndex[logicChunkIndex]
 	if !found {
 		if len(sf.freeActualChunkList) > 0 {
@@ -72,6 +76,9 @@ func (sf *SwapFile) NewTempFileChunk(logicChunkIndex LogicChunkIndex) (tc *SwapF
 }
 
 func (sc *SwapFileChunk) FreeResource() {
+	sc.swapfile.logicToActualChunkIndexLock.Lock()
+	defer sc.swapfile.logicToActualChunkIndexLock.Unlock()
+
 	sc.swapfile.freeActualChunkList = append(sc.swapfile.freeActualChunkList, sc.actualChunkIndex)
 	delete(sc.swapfile.logicToActualChunkIndex, sc.logicChunkIndex)
 }
diff --git a/weed/mount/weedfs.go b/weed/mount/weedfs.go
index 195a5bb27..169925427 100644
--- a/weed/mount/weedfs.go
+++ b/weed/mount/weedfs.go
@@ -6,6 +6,7 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/mount/meta_cache"
 	"github.com/chrislusf/seaweedfs/weed/pb"
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/mount_pb"
 	"github.com/chrislusf/seaweedfs/weed/storage/types"
 	"github.com/chrislusf/seaweedfs/weed/util"
 	"github.com/chrislusf/seaweedfs/weed/util/chunk_cache"
@@ -59,6 +60,7 @@ type WFS struct {
 	// https://dl.acm.org/doi/fullHtml/10.1145/3310148
 	// follow https://github.com/hanwen/go-fuse/blob/master/fuse/api.go
 	fuse.RawFileSystem
+	mount_pb.UnimplementedSeaweedMountServer
 	fs.Inode
 	option            *Option
 	metaCache         *meta_cache.MetaCache
diff --git a/weed/mount/weedfs_grpc_server.go b/weed/mount/weedfs_grpc_server.go
new file mode 100644
index 000000000..4b2fdffa6
--- /dev/null
+++ b/weed/mount/weedfs_grpc_server.go
@@ -0,0 +1,17 @@
+package mount
+
+import (
+	"context"
+	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/pb/mount_pb"
+)
+
+func (wfs *WFS) Configure(ctx context.Context, request *mount_pb.ConfigureRequest) (*mount_pb.ConfigureResponse, error) {
+	if wfs.option.Collection == "" {
+		return nil, fmt.Errorf("mount quota only works when mounted to a new folder with a collection")
+	}
+	glog.V(0).Infof("quota changed from %d to %d", wfs.option.Quota, request.CollectionCapacity)
+	wfs.option.Quota = request.GetCollectionCapacity()
+	return &mount_pb.ConfigureResponse{}, nil
+}
diff --git a/weed/mount/weedfs_quota.go b/weed/mount/weedfs_quota.go
index f9307a6b3..ac3e58e62 100644
--- a/weed/mount/weedfs_quota.go
+++ b/weed/mount/weedfs_quota.go
@@ -10,12 +10,14 @@ import (
 
 func (wfs *WFS) loopCheckQuota() {
 
-	if wfs.option.Quota <= 0 {
-		return
-	}
-
 	for {
 
+		time.Sleep(61 * time.Second)
+
+		if wfs.option.Quota <= 0 {
+			continue
+		}
+
 		err := wfs.WithFilerClient(false, func(client filer_pb.SeaweedFilerClient) error {
 
 			request := &filer_pb.StatisticsRequest{
@@ -47,7 +49,6 @@ func (wfs *WFS) loopCheckQuota() {
 			glog.Warningf("read quota usage: %v", err)
 		}
 
-		time.Sleep(61 * time.Second)
 	}
 
 }
diff --git a/weed/pb/Makefile b/weed/pb/Makefile
index dc27172b6..954b4cb98 100644
--- a/weed/pb/Makefile
+++ b/weed/pb/Makefile
@@ -8,6 +8,7 @@ gen:
 	protoc filer.proto --go_out=./filer_pb --go-grpc_out=./filer_pb --go_opt=paths=source_relative --go-grpc_opt=paths=source_relative
 	protoc remote.proto --go_out=./remote_pb --go-grpc_out=./remote_pb --go_opt=paths=source_relative --go-grpc_opt=paths=source_relative
 	protoc iam.proto --go_out=./iam_pb --go-grpc_out=./iam_pb --go_opt=paths=source_relative --go-grpc_opt=paths=source_relative
+	protoc mount.proto --go_out=./mount_pb --go-grpc_out=./mount_pb --go_opt=paths=source_relative --go-grpc_opt=paths=source_relative
 	protoc messaging.proto --go_out=./messaging_pb --go-grpc_out=./messaging_pb --go_opt=paths=source_relative --go-grpc_opt=paths=source_relative
 	# protoc filer.proto --java_out=../../other/java/client/src/main/java
 	cp filer.proto ../../other/java/client/src/main/proto
diff --git a/weed/pb/filer.proto b/weed/pb/filer.proto
index 389332114..35086e245 100644
--- a/weed/pb/filer.proto
+++ b/weed/pb/filer.proto
@@ -48,6 +48,9 @@ service SeaweedFiler {
     rpc Statistics (StatisticsRequest) returns (StatisticsResponse) {
     }
 
+    rpc Ping (PingRequest) returns (PingResponse) {
+    }
+
     rpc GetFilerConfiguration (GetFilerConfigurationRequest) returns (GetFilerConfigurationResponse) {
     }
 
@@ -311,6 +314,13 @@ message StatisticsResponse {
     uint64 file_count = 6;
 }
 
+message PingRequest {
+    string target = 1; // default to ping itself
+    string target_type = 2;
+}
+message PingResponse {
+}
+
 message GetFilerConfigurationRequest {
 }
 message GetFilerConfigurationResponse {
diff --git a/weed/pb/filer_pb/filer.pb.go b/weed/pb/filer_pb/filer.pb.go
index e9628ce57..16e19944d 100644
--- a/weed/pb/filer_pb/filer.pb.go
+++ b/weed/pb/filer_pb/filer.pb.go
@@ -2524,6 +2524,99 @@ func (x *StatisticsResponse) GetFileCount() uint64 {
 	return 0
 }
 
+type PingRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Target     string `protobuf:"bytes,1,opt,name=target,proto3" json:"target,omitempty"` // default to ping itself
+	TargetType string `protobuf:"bytes,2,opt,name=target_type,json=targetType,proto3" json:"target_type,omitempty"`
+}
+
+func (x *PingRequest) Reset() {
+	*x = PingRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_filer_proto_msgTypes[37]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *PingRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*PingRequest) ProtoMessage() {}
+
+func (x *PingRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_filer_proto_msgTypes[37]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use PingRequest.ProtoReflect.Descriptor instead.
+func (*PingRequest) Descriptor() ([]byte, []int) {
+	return file_filer_proto_rawDescGZIP(), []int{37}
+}
+
+func (x *PingRequest) GetTarget() string {
+	if x != nil {
+		return x.Target
+	}
+	return ""
+}
+
+func (x *PingRequest) GetTargetType() string {
+	if x != nil {
+		return x.TargetType
+	}
+	return ""
+}
+
+type PingResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+}
+
+func (x *PingResponse) Reset() {
+	*x = PingResponse{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_filer_proto_msgTypes[38]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *PingResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*PingResponse) ProtoMessage() {}
+
+func (x *PingResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_filer_proto_msgTypes[38]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use PingResponse.ProtoReflect.Descriptor instead.
+func (*PingResponse) Descriptor() ([]byte, []int) {
+	return file_filer_proto_rawDescGZIP(), []int{38}
+}
+
 type GetFilerConfigurationRequest struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -2533,7 +2626,7 @@ type GetFilerConfigurationRequest struct {
 func (x *GetFilerConfigurationRequest) Reset() {
 	*x = GetFilerConfigurationRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_filer_proto_msgTypes[37]
+		mi := &file_filer_proto_msgTypes[39]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2546,7 +2639,7 @@ func (x *GetFilerConfigurationRequest) String() string {
 func (*GetFilerConfigurationRequest) ProtoMessage() {}
 
 func (x *GetFilerConfigurationRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_filer_proto_msgTypes[37]
+	mi := &file_filer_proto_msgTypes[39]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2559,7 +2652,7 @@ func (x *GetFilerConfigurationRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use GetFilerConfigurationRequest.ProtoReflect.Descriptor instead.
 func (*GetFilerConfigurationRequest) Descriptor() ([]byte, []int) {
-	return file_filer_proto_rawDescGZIP(), []int{37}
+	return file_filer_proto_rawDescGZIP(), []int{39}
 }
 
 type GetFilerConfigurationResponse struct {
@@ -2583,7 +2676,7 @@ type GetFilerConfigurationResponse struct {
 func (x *GetFilerConfigurationResponse) Reset() {
 	*x = GetFilerConfigurationResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_filer_proto_msgTypes[38]
+		mi := &file_filer_proto_msgTypes[40]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2596,7 +2689,7 @@ func (x *GetFilerConfigurationResponse) String() string {
 func (*GetFilerConfigurationResponse) ProtoMessage() {}
 
 func (x *GetFilerConfigurationResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_filer_proto_msgTypes[38]
+	mi := &file_filer_proto_msgTypes[40]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2609,7 +2702,7 @@ func (x *GetFilerConfigurationResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use GetFilerConfigurationResponse.ProtoReflect.Descriptor instead.
 func (*GetFilerConfigurationResponse) Descriptor() ([]byte, []int) {
-	return file_filer_proto_rawDescGZIP(), []int{38}
+	return file_filer_proto_rawDescGZIP(), []int{40}
 }
 
 func (x *GetFilerConfigurationResponse) GetMasters() []string {
@@ -2705,7 +2798,7 @@ type SubscribeMetadataRequest struct {
 func (x *SubscribeMetadataRequest) Reset() {
 	*x = SubscribeMetadataRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_filer_proto_msgTypes[39]
+		mi := &file_filer_proto_msgTypes[41]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2718,7 +2811,7 @@ func (x *SubscribeMetadataRequest) String() string {
 func (*SubscribeMetadataRequest) ProtoMessage() {}
 
 func (x *SubscribeMetadataRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_filer_proto_msgTypes[39]
+	mi := &file_filer_proto_msgTypes[41]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2731,7 +2824,7 @@ func (x *SubscribeMetadataRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use SubscribeMetadataRequest.ProtoReflect.Descriptor instead.
 func (*SubscribeMetadataRequest) Descriptor() ([]byte, []int) {
-	return file_filer_proto_rawDescGZIP(), []int{39}
+	return file_filer_proto_rawDescGZIP(), []int{41}
 }
 
 func (x *SubscribeMetadataRequest) GetClientName() string {
@@ -2789,7 +2882,7 @@ type SubscribeMetadataResponse struct {
 func (x *SubscribeMetadataResponse) Reset() {
 	*x = SubscribeMetadataResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_filer_proto_msgTypes[40]
+		mi := &file_filer_proto_msgTypes[42]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2802,7 +2895,7 @@ func (x *SubscribeMetadataResponse) String() string {
 func (*SubscribeMetadataResponse) ProtoMessage() {}
 
 func (x *SubscribeMetadataResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_filer_proto_msgTypes[40]
+	mi := &file_filer_proto_msgTypes[42]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2815,7 +2908,7 @@ func (x *SubscribeMetadataResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use SubscribeMetadataResponse.ProtoReflect.Descriptor instead.
 func (*SubscribeMetadataResponse) Descriptor() ([]byte, []int) {
-	return file_filer_proto_rawDescGZIP(), []int{40}
+	return file_filer_proto_rawDescGZIP(), []int{42}
 }
 
 func (x *SubscribeMetadataResponse) GetDirectory() string {
@@ -2852,7 +2945,7 @@ type LogEntry struct {
 func (x *LogEntry) Reset() {
 	*x = LogEntry{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_filer_proto_msgTypes[41]
+		mi := &file_filer_proto_msgTypes[43]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2865,7 +2958,7 @@ func (x *LogEntry) String() string {
 func (*LogEntry) ProtoMessage() {}
 
 func (x *LogEntry) ProtoReflect() protoreflect.Message {
-	mi := &file_filer_proto_msgTypes[41]
+	mi := &file_filer_proto_msgTypes[43]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2878,7 +2971,7 @@ func (x *LogEntry) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use LogEntry.ProtoReflect.Descriptor instead.
 func (*LogEntry) Descriptor() ([]byte, []int) {
-	return file_filer_proto_rawDescGZIP(), []int{41}
+	return file_filer_proto_rawDescGZIP(), []int{43}
 }
 
 func (x *LogEntry) GetTsNs() int64 {
@@ -2915,7 +3008,7 @@ type KeepConnectedRequest struct {
 func (x *KeepConnectedRequest) Reset() {
 	*x = KeepConnectedRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_filer_proto_msgTypes[42]
+		mi := &file_filer_proto_msgTypes[44]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2928,7 +3021,7 @@ func (x *KeepConnectedRequest) String() string {
 func (*KeepConnectedRequest) ProtoMessage() {}
 
 func (x *KeepConnectedRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_filer_proto_msgTypes[42]
+	mi := &file_filer_proto_msgTypes[44]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2941,7 +3034,7 @@ func (x *KeepConnectedRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use KeepConnectedRequest.ProtoReflect.Descriptor instead.
 func (*KeepConnectedRequest) Descriptor() ([]byte, []int) {
-	return file_filer_proto_rawDescGZIP(), []int{42}
+	return file_filer_proto_rawDescGZIP(), []int{44}
 }
 
 func (x *KeepConnectedRequest) GetName() string {
@@ -2974,7 +3067,7 @@ type KeepConnectedResponse struct {
 func (x *KeepConnectedResponse) Reset() {
 	*x = KeepConnectedResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_filer_proto_msgTypes[43]
+		mi := &file_filer_proto_msgTypes[45]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2987,7 +3080,7 @@ func (x *KeepConnectedResponse) String() string {
 func (*KeepConnectedResponse) ProtoMessage() {}
 
 func (x *KeepConnectedResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_filer_proto_msgTypes[43]
+	mi := &file_filer_proto_msgTypes[45]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -3000,7 +3093,7 @@ func (x *KeepConnectedResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use KeepConnectedResponse.ProtoReflect.Descriptor instead.
 func (*KeepConnectedResponse) Descriptor() ([]byte, []int) {
-	return file_filer_proto_rawDescGZIP(), []int{43}
+	return file_filer_proto_rawDescGZIP(), []int{45}
 }
 
 type LocateBrokerRequest struct {
@@ -3014,7 +3107,7 @@ type LocateBrokerRequest struct {
 func (x *LocateBrokerRequest) Reset() {
 	*x = LocateBrokerRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_filer_proto_msgTypes[44]
+		mi := &file_filer_proto_msgTypes[46]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -3027,7 +3120,7 @@ func (x *LocateBrokerRequest) String() string {
 func (*LocateBrokerRequest) ProtoMessage() {}
 
 func (x *LocateBrokerRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_filer_proto_msgTypes[44]
+	mi := &file_filer_proto_msgTypes[46]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -3040,7 +3133,7 @@ func (x *LocateBrokerRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use LocateBrokerRequest.ProtoReflect.Descriptor instead.
 func (*LocateBrokerRequest) Descriptor() ([]byte, []int) {
-	return file_filer_proto_rawDescGZIP(), []int{44}
+	return file_filer_proto_rawDescGZIP(), []int{46}
 }
 
 func (x *LocateBrokerRequest) GetResource() string {
@@ -3062,7 +3155,7 @@ type LocateBrokerResponse struct {
 func (x *LocateBrokerResponse) Reset() {
 	*x = LocateBrokerResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_filer_proto_msgTypes[45]
+		mi := &file_filer_proto_msgTypes[47]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -3075,7 +3168,7 @@ func (x *LocateBrokerResponse) String() string {
 func (*LocateBrokerResponse) ProtoMessage() {}
 
 func (x *LocateBrokerResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_filer_proto_msgTypes[45]
+	mi := &file_filer_proto_msgTypes[47]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -3088,7 +3181,7 @@ func (x *LocateBrokerResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use LocateBrokerResponse.ProtoReflect.Descriptor instead.
 func (*LocateBrokerResponse) Descriptor() ([]byte, []int) {
-	return file_filer_proto_rawDescGZIP(), []int{45}
+	return file_filer_proto_rawDescGZIP(), []int{47}
 }
 
 func (x *LocateBrokerResponse) GetFound() bool {
@@ -3119,7 +3212,7 @@ type KvGetRequest struct {
 func (x *KvGetRequest) Reset() {
 	*x = KvGetRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_filer_proto_msgTypes[46]
+		mi := &file_filer_proto_msgTypes[48]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -3132,7 +3225,7 @@ func (x *KvGetRequest) String() string {
 func (*KvGetRequest) ProtoMessage() {}
 
 func (x *KvGetRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_filer_proto_msgTypes[46]
+	mi := &file_filer_proto_msgTypes[48]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -3145,7 +3238,7 @@ func (x *KvGetRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use KvGetRequest.ProtoReflect.Descriptor instead.
 func (*KvGetRequest) Descriptor() ([]byte, []int) {
-	return file_filer_proto_rawDescGZIP(), []int{46}
+	return file_filer_proto_rawDescGZIP(), []int{48}
 }
 
 func (x *KvGetRequest) GetKey() []byte {
@@ -3167,7 +3260,7 @@ type KvGetResponse struct {
 func (x *KvGetResponse) Reset() {
 	*x = KvGetResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_filer_proto_msgTypes[47]
+		mi := &file_filer_proto_msgTypes[49]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -3180,7 +3273,7 @@ func (x *KvGetResponse) String() string {
 func (*KvGetResponse) ProtoMessage() {}
 
 func (x *KvGetResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_filer_proto_msgTypes[47]
+	mi := &file_filer_proto_msgTypes[49]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -3193,7 +3286,7 @@ func (x *KvGetResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use KvGetResponse.ProtoReflect.Descriptor instead.
 func (*KvGetResponse) Descriptor() ([]byte, []int) {
-	return file_filer_proto_rawDescGZIP(), []int{47}
+	return file_filer_proto_rawDescGZIP(), []int{49}
 }
 
 func (x *KvGetResponse) GetValue() []byte {
@@ -3222,7 +3315,7 @@ type KvPutRequest struct {
 func (x *KvPutRequest) Reset() {
 	*x = KvPutRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_filer_proto_msgTypes[48]
+		mi := &file_filer_proto_msgTypes[50]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -3235,7 +3328,7 @@ func (x *KvPutRequest) String() string {
 func (*KvPutRequest) ProtoMessage() {}
 
 func (x *KvPutRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_filer_proto_msgTypes[48]
+	mi := &file_filer_proto_msgTypes[50]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -3248,7 +3341,7 @@ func (x *KvPutRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use KvPutRequest.ProtoReflect.Descriptor instead.
 func (*KvPutRequest) Descriptor() ([]byte, []int) {
-	return file_filer_proto_rawDescGZIP(), []int{48}
+	return file_filer_proto_rawDescGZIP(), []int{50}
 }
 
 func (x *KvPutRequest) GetKey() []byte {
@@ -3276,7 +3369,7 @@ type KvPutResponse struct {
 func (x *KvPutResponse) Reset() {
 	*x = KvPutResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_filer_proto_msgTypes[49]
+		mi := &file_filer_proto_msgTypes[51]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -3289,7 +3382,7 @@ func (x *KvPutResponse) String() string {
 func (*KvPutResponse) ProtoMessage() {}
 
 func (x *KvPutResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_filer_proto_msgTypes[49]
+	mi := &file_filer_proto_msgTypes[51]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -3302,7 +3395,7 @@ func (x *KvPutResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use KvPutResponse.ProtoReflect.Descriptor instead.
 func (*KvPutResponse) Descriptor() ([]byte, []int) {
-	return file_filer_proto_rawDescGZIP(), []int{49}
+	return file_filer_proto_rawDescGZIP(), []int{51}
 }
 
 func (x *KvPutResponse) GetError() string {
@@ -3327,7 +3420,7 @@ type FilerConf struct {
 func (x *FilerConf) Reset() {
 	*x = FilerConf{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_filer_proto_msgTypes[50]
+		mi := &file_filer_proto_msgTypes[52]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -3340,7 +3433,7 @@ func (x *FilerConf) String() string {
 func (*FilerConf) ProtoMessage() {}
 
 func (x *FilerConf) ProtoReflect() protoreflect.Message {
-	mi := &file_filer_proto_msgTypes[50]
+	mi := &file_filer_proto_msgTypes[52]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -3353,7 +3446,7 @@ func (x *FilerConf) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use FilerConf.ProtoReflect.Descriptor instead.
 func (*FilerConf) Descriptor() ([]byte, []int) {
-	return file_filer_proto_rawDescGZIP(), []int{50}
+	return file_filer_proto_rawDescGZIP(), []int{52}
 }
 
 func (x *FilerConf) GetVersion() int32 {
@@ -3385,7 +3478,7 @@ type CacheRemoteObjectToLocalClusterRequest struct {
 func (x *CacheRemoteObjectToLocalClusterRequest) Reset() {
 	*x = CacheRemoteObjectToLocalClusterRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_filer_proto_msgTypes[51]
+		mi := &file_filer_proto_msgTypes[53]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -3398,7 +3491,7 @@ func (x *CacheRemoteObjectToLocalClusterRequest) String() string {
 func (*CacheRemoteObjectToLocalClusterRequest) ProtoMessage() {}
 
 func (x *CacheRemoteObjectToLocalClusterRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_filer_proto_msgTypes[51]
+	mi := &file_filer_proto_msgTypes[53]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -3411,7 +3504,7 @@ func (x *CacheRemoteObjectToLocalClusterRequest) ProtoReflect() protoreflect.Mes
 
 // Deprecated: Use CacheRemoteObjectToLocalClusterRequest.ProtoReflect.Descriptor instead.
 func (*CacheRemoteObjectToLocalClusterRequest) Descriptor() ([]byte, []int) {
-	return file_filer_proto_rawDescGZIP(), []int{51}
+	return file_filer_proto_rawDescGZIP(), []int{53}
 }
 
 func (x *CacheRemoteObjectToLocalClusterRequest) GetDirectory() string {
@@ -3439,7 +3532,7 @@ type CacheRemoteObjectToLocalClusterResponse struct {
 func (x *CacheRemoteObjectToLocalClusterResponse) Reset() {
 	*x = CacheRemoteObjectToLocalClusterResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_filer_proto_msgTypes[52]
+		mi := &file_filer_proto_msgTypes[54]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -3452,7 +3545,7 @@ func (x *CacheRemoteObjectToLocalClusterResponse) String() string {
 func (*CacheRemoteObjectToLocalClusterResponse) ProtoMessage() {}
 
 func (x *CacheRemoteObjectToLocalClusterResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_filer_proto_msgTypes[52]
+	mi := &file_filer_proto_msgTypes[54]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -3465,7 +3558,7 @@ func (x *CacheRemoteObjectToLocalClusterResponse) ProtoReflect() protoreflect.Me
 
 // Deprecated: Use CacheRemoteObjectToLocalClusterResponse.ProtoReflect.Descriptor instead.
 func (*CacheRemoteObjectToLocalClusterResponse) Descriptor() ([]byte, []int) {
-	return file_filer_proto_rawDescGZIP(), []int{52}
+	return file_filer_proto_rawDescGZIP(), []int{54}
 }
 
 func (x *CacheRemoteObjectToLocalClusterResponse) GetEntry() *Entry {
@@ -3489,7 +3582,7 @@ type LocateBrokerResponse_Resource struct {
 func (x *LocateBrokerResponse_Resource) Reset() {
 	*x = LocateBrokerResponse_Resource{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_filer_proto_msgTypes[55]
+		mi := &file_filer_proto_msgTypes[57]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -3502,7 +3595,7 @@ func (x *LocateBrokerResponse_Resource) String() string {
 func (*LocateBrokerResponse_Resource) ProtoMessage() {}
 
 func (x *LocateBrokerResponse_Resource) ProtoReflect() protoreflect.Message {
-	mi := &file_filer_proto_msgTypes[55]
+	mi := &file_filer_proto_msgTypes[57]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -3515,7 +3608,7 @@ func (x *LocateBrokerResponse_Resource) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use LocateBrokerResponse_Resource.ProtoReflect.Descriptor instead.
 func (*LocateBrokerResponse_Resource) Descriptor() ([]byte, []int) {
-	return file_filer_proto_rawDescGZIP(), []int{45, 0}
+	return file_filer_proto_rawDescGZIP(), []int{47, 0}
 }
 
 func (x *LocateBrokerResponse_Resource) GetGrpcAddresses() string {
@@ -3553,7 +3646,7 @@ type FilerConf_PathConf struct {
 func (x *FilerConf_PathConf) Reset() {
 	*x = FilerConf_PathConf{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_filer_proto_msgTypes[56]
+		mi := &file_filer_proto_msgTypes[58]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -3566,7 +3659,7 @@ func (x *FilerConf_PathConf) String() string {
 func (*FilerConf_PathConf) ProtoMessage() {}
 
 func (x *FilerConf_PathConf) ProtoReflect() protoreflect.Message {
-	mi := &file_filer_proto_msgTypes[56]
+	mi := &file_filer_proto_msgTypes[58]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -3579,7 +3672,7 @@ func (x *FilerConf_PathConf) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use FilerConf_PathConf.ProtoReflect.Descriptor instead.
 func (*FilerConf_PathConf) Descriptor() ([]byte, []int) {
-	return file_filer_proto_rawDescGZIP(), []int{50, 0}
+	return file_filer_proto_rawDescGZIP(), []int{52, 0}
 }
 
 func (x *FilerConf_PathConf) GetLocationPrefix() string {
@@ -4002,260 +4095,269 @@ var file_filer_proto_rawDesc = []byte{
 	0x65, 0x12, 0x1b, 0x0a, 0x09, 0x75, 0x73, 0x65, 0x64, 0x5f, 0x73, 0x69, 0x7a, 0x65, 0x18, 0x05,
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+	0x69, 0x6c, 0x65, 0x72, 0x5f, 0x70, 0x62, 0x2e, 0x43, 0x61, 0x63, 0x68, 0x65, 0x52, 0x65, 0x6d,
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+	0x63, 0x68, 0x72, 0x69, 0x73, 0x6c, 0x75, 0x73, 0x66, 0x2f, 0x73, 0x65, 0x61, 0x77, 0x65, 0x65,
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+	0x72, 0x5f, 0x70, 0x62, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
@@ -4270,7 +4372,7 @@ func file_filer_proto_rawDescGZIP() []byte {
 	return file_filer_proto_rawDescData
 }
 
-var file_filer_proto_msgTypes = make([]protoimpl.MessageInfo, 57)
+var file_filer_proto_msgTypes = make([]protoimpl.MessageInfo, 59)
 var file_filer_proto_goTypes = []interface{}{
 	(*LookupDirectoryEntryRequest)(nil),             // 0: filer_pb.LookupDirectoryEntryRequest
 	(*LookupDirectoryEntryResponse)(nil),            // 1: filer_pb.LookupDirectoryEntryResponse
@@ -4309,33 +4411,35 @@ var file_filer_proto_goTypes = []interface{}{
 	(*DeleteCollectionResponse)(nil),                // 34: filer_pb.DeleteCollectionResponse
 	(*StatisticsRequest)(nil),                       // 35: filer_pb.StatisticsRequest
 	(*StatisticsResponse)(nil),                      // 36: filer_pb.StatisticsResponse
-	(*GetFilerConfigurationRequest)(nil),            // 37: filer_pb.GetFilerConfigurationRequest
-	(*GetFilerConfigurationResponse)(nil),           // 38: filer_pb.GetFilerConfigurationResponse
-	(*SubscribeMetadataRequest)(nil),                // 39: filer_pb.SubscribeMetadataRequest
-	(*SubscribeMetadataResponse)(nil),               // 40: filer_pb.SubscribeMetadataResponse
-	(*LogEntry)(nil),                                // 41: filer_pb.LogEntry
-	(*KeepConnectedRequest)(nil),                    // 42: filer_pb.KeepConnectedRequest
-	(*KeepConnectedResponse)(nil),                   // 43: filer_pb.KeepConnectedResponse
-	(*LocateBrokerRequest)(nil),                     // 44: filer_pb.LocateBrokerRequest
-	(*LocateBrokerResponse)(nil),                    // 45: filer_pb.LocateBrokerResponse
-	(*KvGetRequest)(nil),                            // 46: filer_pb.KvGetRequest
-	(*KvGetResponse)(nil),                           // 47: filer_pb.KvGetResponse
-	(*KvPutRequest)(nil),                            // 48: filer_pb.KvPutRequest
-	(*KvPutResponse)(nil),                           // 49: filer_pb.KvPutResponse
-	(*FilerConf)(nil),                               // 50: filer_pb.FilerConf
-	(*CacheRemoteObjectToLocalClusterRequest)(nil),  // 51: filer_pb.CacheRemoteObjectToLocalClusterRequest
-	(*CacheRemoteObjectToLocalClusterResponse)(nil), // 52: filer_pb.CacheRemoteObjectToLocalClusterResponse
-	nil,                                   // 53: filer_pb.Entry.ExtendedEntry
-	nil,                                   // 54: filer_pb.LookupVolumeResponse.LocationsMapEntry
-	(*LocateBrokerResponse_Resource)(nil), // 55: filer_pb.LocateBrokerResponse.Resource
-	(*FilerConf_PathConf)(nil),            // 56: filer_pb.FilerConf.PathConf
+	(*PingRequest)(nil),                             // 37: filer_pb.PingRequest
+	(*PingResponse)(nil),                            // 38: filer_pb.PingResponse
+	(*GetFilerConfigurationRequest)(nil),            // 39: filer_pb.GetFilerConfigurationRequest
+	(*GetFilerConfigurationResponse)(nil),           // 40: filer_pb.GetFilerConfigurationResponse
+	(*SubscribeMetadataRequest)(nil),                // 41: filer_pb.SubscribeMetadataRequest
+	(*SubscribeMetadataResponse)(nil),               // 42: filer_pb.SubscribeMetadataResponse
+	(*LogEntry)(nil),                                // 43: filer_pb.LogEntry
+	(*KeepConnectedRequest)(nil),                    // 44: filer_pb.KeepConnectedRequest
+	(*KeepConnectedResponse)(nil),                   // 45: filer_pb.KeepConnectedResponse
+	(*LocateBrokerRequest)(nil),                     // 46: filer_pb.LocateBrokerRequest
+	(*LocateBrokerResponse)(nil),                    // 47: filer_pb.LocateBrokerResponse
+	(*KvGetRequest)(nil),                            // 48: filer_pb.KvGetRequest
+	(*KvGetResponse)(nil),                           // 49: filer_pb.KvGetResponse
+	(*KvPutRequest)(nil),                            // 50: filer_pb.KvPutRequest
+	(*KvPutResponse)(nil),                           // 51: filer_pb.KvPutResponse
+	(*FilerConf)(nil),                               // 52: filer_pb.FilerConf
+	(*CacheRemoteObjectToLocalClusterRequest)(nil),  // 53: filer_pb.CacheRemoteObjectToLocalClusterRequest
+	(*CacheRemoteObjectToLocalClusterResponse)(nil), // 54: filer_pb.CacheRemoteObjectToLocalClusterResponse
+	nil,                                   // 55: filer_pb.Entry.ExtendedEntry
+	nil,                                   // 56: filer_pb.LookupVolumeResponse.LocationsMapEntry
+	(*LocateBrokerResponse_Resource)(nil), // 57: filer_pb.LocateBrokerResponse.Resource
+	(*FilerConf_PathConf)(nil),            // 58: filer_pb.FilerConf.PathConf
 }
 var file_filer_proto_depIdxs = []int32{
 	5,  // 0: filer_pb.LookupDirectoryEntryResponse.entry:type_name -> filer_pb.Entry
 	5,  // 1: filer_pb.ListEntriesResponse.entry:type_name -> filer_pb.Entry
 	8,  // 2: filer_pb.Entry.chunks:type_name -> filer_pb.FileChunk
 	11, // 3: filer_pb.Entry.attributes:type_name -> filer_pb.FuseAttributes
-	53, // 4: filer_pb.Entry.extended:type_name -> filer_pb.Entry.ExtendedEntry
+	55, // 4: filer_pb.Entry.extended:type_name -> filer_pb.Entry.ExtendedEntry
 	4,  // 5: filer_pb.Entry.remote_entry:type_name -> filer_pb.RemoteEntry
 	5,  // 6: filer_pb.FullEntry.entry:type_name -> filer_pb.Entry
 	5,  // 7: filer_pb.EventNotification.old_entry:type_name -> filer_pb.Entry
@@ -4349,11 +4453,11 @@ var file_filer_proto_depIdxs = []int32{
 	7,  // 15: filer_pb.StreamRenameEntryResponse.event_notification:type_name -> filer_pb.EventNotification
 	28, // 16: filer_pb.AssignVolumeResponse.location:type_name -> filer_pb.Location
 	28, // 17: filer_pb.Locations.locations:type_name -> filer_pb.Location
-	54, // 18: filer_pb.LookupVolumeResponse.locations_map:type_name -> filer_pb.LookupVolumeResponse.LocationsMapEntry
+	56, // 18: filer_pb.LookupVolumeResponse.locations_map:type_name -> filer_pb.LookupVolumeResponse.LocationsMapEntry
 	30, // 19: filer_pb.CollectionListResponse.collections:type_name -> filer_pb.Collection
 	7,  // 20: filer_pb.SubscribeMetadataResponse.event_notification:type_name -> filer_pb.EventNotification
-	55, // 21: filer_pb.LocateBrokerResponse.resources:type_name -> filer_pb.LocateBrokerResponse.Resource
-	56, // 22: filer_pb.FilerConf.locations:type_name -> filer_pb.FilerConf.PathConf
+	57, // 21: filer_pb.LocateBrokerResponse.resources:type_name -> filer_pb.LocateBrokerResponse.Resource
+	58, // 22: filer_pb.FilerConf.locations:type_name -> filer_pb.FilerConf.PathConf
 	5,  // 23: filer_pb.CacheRemoteObjectToLocalClusterResponse.entry:type_name -> filer_pb.Entry
 	27, // 24: filer_pb.LookupVolumeResponse.LocationsMapEntry.value:type_name -> filer_pb.Locations
 	0,  // 25: filer_pb.SeaweedFiler.LookupDirectoryEntry:input_type -> filer_pb.LookupDirectoryEntryRequest
@@ -4369,37 +4473,39 @@ var file_filer_proto_depIdxs = []int32{
 	31, // 35: filer_pb.SeaweedFiler.CollectionList:input_type -> filer_pb.CollectionListRequest
 	33, // 36: filer_pb.SeaweedFiler.DeleteCollection:input_type -> filer_pb.DeleteCollectionRequest
 	35, // 37: filer_pb.SeaweedFiler.Statistics:input_type -> filer_pb.StatisticsRequest
-	37, // 38: filer_pb.SeaweedFiler.GetFilerConfiguration:input_type -> filer_pb.GetFilerConfigurationRequest
-	39, // 39: filer_pb.SeaweedFiler.SubscribeMetadata:input_type -> filer_pb.SubscribeMetadataRequest
-	39, // 40: filer_pb.SeaweedFiler.SubscribeLocalMetadata:input_type -> filer_pb.SubscribeMetadataRequest
-	42, // 41: filer_pb.SeaweedFiler.KeepConnected:input_type -> filer_pb.KeepConnectedRequest
-	44, // 42: filer_pb.SeaweedFiler.LocateBroker:input_type -> filer_pb.LocateBrokerRequest
-	46, // 43: filer_pb.SeaweedFiler.KvGet:input_type -> filer_pb.KvGetRequest
-	48, // 44: filer_pb.SeaweedFiler.KvPut:input_type -> filer_pb.KvPutRequest
-	51, // 45: filer_pb.SeaweedFiler.CacheRemoteObjectToLocalCluster:input_type -> filer_pb.CacheRemoteObjectToLocalClusterRequest
-	1,  // 46: filer_pb.SeaweedFiler.LookupDirectoryEntry:output_type -> filer_pb.LookupDirectoryEntryResponse
-	3,  // 47: filer_pb.SeaweedFiler.ListEntries:output_type -> filer_pb.ListEntriesResponse
-	13, // 48: filer_pb.SeaweedFiler.CreateEntry:output_type -> filer_pb.CreateEntryResponse
-	15, // 49: filer_pb.SeaweedFiler.UpdateEntry:output_type -> filer_pb.UpdateEntryResponse
-	17, // 50: filer_pb.SeaweedFiler.AppendToEntry:output_type -> filer_pb.AppendToEntryResponse
-	19, // 51: filer_pb.SeaweedFiler.DeleteEntry:output_type -> filer_pb.DeleteEntryResponse
-	21, // 52: filer_pb.SeaweedFiler.AtomicRenameEntry:output_type -> filer_pb.AtomicRenameEntryResponse
-	23, // 53: filer_pb.SeaweedFiler.StreamRenameEntry:output_type -> filer_pb.StreamRenameEntryResponse
-	25, // 54: filer_pb.SeaweedFiler.AssignVolume:output_type -> filer_pb.AssignVolumeResponse
-	29, // 55: filer_pb.SeaweedFiler.LookupVolume:output_type -> filer_pb.LookupVolumeResponse
-	32, // 56: filer_pb.SeaweedFiler.CollectionList:output_type -> filer_pb.CollectionListResponse
-	34, // 57: filer_pb.SeaweedFiler.DeleteCollection:output_type -> filer_pb.DeleteCollectionResponse
-	36, // 58: filer_pb.SeaweedFiler.Statistics:output_type -> filer_pb.StatisticsResponse
-	38, // 59: filer_pb.SeaweedFiler.GetFilerConfiguration:output_type -> filer_pb.GetFilerConfigurationResponse
-	40, // 60: filer_pb.SeaweedFiler.SubscribeMetadata:output_type -> filer_pb.SubscribeMetadataResponse
-	40, // 61: filer_pb.SeaweedFiler.SubscribeLocalMetadata:output_type -> filer_pb.SubscribeMetadataResponse
-	43, // 62: filer_pb.SeaweedFiler.KeepConnected:output_type -> filer_pb.KeepConnectedResponse
-	45, // 63: filer_pb.SeaweedFiler.LocateBroker:output_type -> filer_pb.LocateBrokerResponse
-	47, // 64: filer_pb.SeaweedFiler.KvGet:output_type -> filer_pb.KvGetResponse
-	49, // 65: filer_pb.SeaweedFiler.KvPut:output_type -> filer_pb.KvPutResponse
-	52, // 66: filer_pb.SeaweedFiler.CacheRemoteObjectToLocalCluster:output_type -> filer_pb.CacheRemoteObjectToLocalClusterResponse
-	46, // [46:67] is the sub-list for method output_type
-	25, // [25:46] is the sub-list for method input_type
+	37, // 38: filer_pb.SeaweedFiler.Ping:input_type -> filer_pb.PingRequest
+	39, // 39: filer_pb.SeaweedFiler.GetFilerConfiguration:input_type -> filer_pb.GetFilerConfigurationRequest
+	41, // 40: filer_pb.SeaweedFiler.SubscribeMetadata:input_type -> filer_pb.SubscribeMetadataRequest
+	41, // 41: filer_pb.SeaweedFiler.SubscribeLocalMetadata:input_type -> filer_pb.SubscribeMetadataRequest
+	44, // 42: filer_pb.SeaweedFiler.KeepConnected:input_type -> filer_pb.KeepConnectedRequest
+	46, // 43: filer_pb.SeaweedFiler.LocateBroker:input_type -> filer_pb.LocateBrokerRequest
+	48, // 44: filer_pb.SeaweedFiler.KvGet:input_type -> filer_pb.KvGetRequest
+	50, // 45: filer_pb.SeaweedFiler.KvPut:input_type -> filer_pb.KvPutRequest
+	53, // 46: filer_pb.SeaweedFiler.CacheRemoteObjectToLocalCluster:input_type -> filer_pb.CacheRemoteObjectToLocalClusterRequest
+	1,  // 47: filer_pb.SeaweedFiler.LookupDirectoryEntry:output_type -> filer_pb.LookupDirectoryEntryResponse
+	3,  // 48: filer_pb.SeaweedFiler.ListEntries:output_type -> filer_pb.ListEntriesResponse
+	13, // 49: filer_pb.SeaweedFiler.CreateEntry:output_type -> filer_pb.CreateEntryResponse
+	15, // 50: filer_pb.SeaweedFiler.UpdateEntry:output_type -> filer_pb.UpdateEntryResponse
+	17, // 51: filer_pb.SeaweedFiler.AppendToEntry:output_type -> filer_pb.AppendToEntryResponse
+	19, // 52: filer_pb.SeaweedFiler.DeleteEntry:output_type -> filer_pb.DeleteEntryResponse
+	21, // 53: filer_pb.SeaweedFiler.AtomicRenameEntry:output_type -> filer_pb.AtomicRenameEntryResponse
+	23, // 54: filer_pb.SeaweedFiler.StreamRenameEntry:output_type -> filer_pb.StreamRenameEntryResponse
+	25, // 55: filer_pb.SeaweedFiler.AssignVolume:output_type -> filer_pb.AssignVolumeResponse
+	29, // 56: filer_pb.SeaweedFiler.LookupVolume:output_type -> filer_pb.LookupVolumeResponse
+	32, // 57: filer_pb.SeaweedFiler.CollectionList:output_type -> filer_pb.CollectionListResponse
+	34, // 58: filer_pb.SeaweedFiler.DeleteCollection:output_type -> filer_pb.DeleteCollectionResponse
+	36, // 59: filer_pb.SeaweedFiler.Statistics:output_type -> filer_pb.StatisticsResponse
+	38, // 60: filer_pb.SeaweedFiler.Ping:output_type -> filer_pb.PingResponse
+	40, // 61: filer_pb.SeaweedFiler.GetFilerConfiguration:output_type -> filer_pb.GetFilerConfigurationResponse
+	42, // 62: filer_pb.SeaweedFiler.SubscribeMetadata:output_type -> filer_pb.SubscribeMetadataResponse
+	42, // 63: filer_pb.SeaweedFiler.SubscribeLocalMetadata:output_type -> filer_pb.SubscribeMetadataResponse
+	45, // 64: filer_pb.SeaweedFiler.KeepConnected:output_type -> filer_pb.KeepConnectedResponse
+	47, // 65: filer_pb.SeaweedFiler.LocateBroker:output_type -> filer_pb.LocateBrokerResponse
+	49, // 66: filer_pb.SeaweedFiler.KvGet:output_type -> filer_pb.KvGetResponse
+	51, // 67: filer_pb.SeaweedFiler.KvPut:output_type -> filer_pb.KvPutResponse
+	54, // 68: filer_pb.SeaweedFiler.CacheRemoteObjectToLocalCluster:output_type -> filer_pb.CacheRemoteObjectToLocalClusterResponse
+	47, // [47:69] is the sub-list for method output_type
+	25, // [25:47] is the sub-list for method input_type
 	25, // [25:25] is the sub-list for extension type_name
 	25, // [25:25] is the sub-list for extension extendee
 	0,  // [0:25] is the sub-list for field type_name
@@ -4856,7 +4962,7 @@ func file_filer_proto_init() {
 			}
 		}
 		file_filer_proto_msgTypes[37].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*GetFilerConfigurationRequest); i {
+			switch v := v.(*PingRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4868,7 +4974,7 @@ func file_filer_proto_init() {
 			}
 		}
 		file_filer_proto_msgTypes[38].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*GetFilerConfigurationResponse); i {
+			switch v := v.(*PingResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4880,7 +4986,7 @@ func file_filer_proto_init() {
 			}
 		}
 		file_filer_proto_msgTypes[39].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*SubscribeMetadataRequest); i {
+			switch v := v.(*GetFilerConfigurationRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4892,7 +4998,7 @@ func file_filer_proto_init() {
 			}
 		}
 		file_filer_proto_msgTypes[40].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*SubscribeMetadataResponse); i {
+			switch v := v.(*GetFilerConfigurationResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4904,7 +5010,7 @@ func file_filer_proto_init() {
 			}
 		}
 		file_filer_proto_msgTypes[41].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*LogEntry); i {
+			switch v := v.(*SubscribeMetadataRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4916,7 +5022,7 @@ func file_filer_proto_init() {
 			}
 		}
 		file_filer_proto_msgTypes[42].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*KeepConnectedRequest); i {
+			switch v := v.(*SubscribeMetadataResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4928,7 +5034,7 @@ func file_filer_proto_init() {
 			}
 		}
 		file_filer_proto_msgTypes[43].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*KeepConnectedResponse); i {
+			switch v := v.(*LogEntry); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4940,7 +5046,7 @@ func file_filer_proto_init() {
 			}
 		}
 		file_filer_proto_msgTypes[44].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*LocateBrokerRequest); i {
+			switch v := v.(*KeepConnectedRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4952,7 +5058,7 @@ func file_filer_proto_init() {
 			}
 		}
 		file_filer_proto_msgTypes[45].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*LocateBrokerResponse); i {
+			switch v := v.(*KeepConnectedResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4964,7 +5070,7 @@ func file_filer_proto_init() {
 			}
 		}
 		file_filer_proto_msgTypes[46].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*KvGetRequest); i {
+			switch v := v.(*LocateBrokerRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4976,7 +5082,7 @@ func file_filer_proto_init() {
 			}
 		}
 		file_filer_proto_msgTypes[47].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*KvGetResponse); i {
+			switch v := v.(*LocateBrokerResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4988,7 +5094,7 @@ func file_filer_proto_init() {
 			}
 		}
 		file_filer_proto_msgTypes[48].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*KvPutRequest); i {
+			switch v := v.(*KvGetRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -5000,7 +5106,7 @@ func file_filer_proto_init() {
 			}
 		}
 		file_filer_proto_msgTypes[49].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*KvPutResponse); i {
+			switch v := v.(*KvGetResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -5012,7 +5118,7 @@ func file_filer_proto_init() {
 			}
 		}
 		file_filer_proto_msgTypes[50].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*FilerConf); i {
+			switch v := v.(*KvPutRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -5024,7 +5130,7 @@ func file_filer_proto_init() {
 			}
 		}
 		file_filer_proto_msgTypes[51].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*CacheRemoteObjectToLocalClusterRequest); i {
+			switch v := v.(*KvPutResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -5036,6 +5142,30 @@ func file_filer_proto_init() {
 			}
 		}
 		file_filer_proto_msgTypes[52].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*FilerConf); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_filer_proto_msgTypes[53].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*CacheRemoteObjectToLocalClusterRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_filer_proto_msgTypes[54].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*CacheRemoteObjectToLocalClusterResponse); i {
 			case 0:
 				return &v.state
@@ -5047,7 +5177,7 @@ func file_filer_proto_init() {
 				return nil
 			}
 		}
-		file_filer_proto_msgTypes[55].Exporter = func(v interface{}, i int) interface{} {
+		file_filer_proto_msgTypes[57].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*LocateBrokerResponse_Resource); i {
 			case 0:
 				return &v.state
@@ -5059,7 +5189,7 @@ func file_filer_proto_init() {
 				return nil
 			}
 		}
-		file_filer_proto_msgTypes[56].Exporter = func(v interface{}, i int) interface{} {
+		file_filer_proto_msgTypes[58].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*FilerConf_PathConf); i {
 			case 0:
 				return &v.state
@@ -5078,7 +5208,7 @@ func file_filer_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_filer_proto_rawDesc,
 			NumEnums:      0,
-			NumMessages:   57,
+			NumMessages:   59,
 			NumExtensions: 0,
 			NumServices:   1,
 		},
diff --git a/weed/pb/filer_pb/filer_grpc.pb.go b/weed/pb/filer_pb/filer_grpc.pb.go
index 02302d317..4a5f47d71 100644
--- a/weed/pb/filer_pb/filer_grpc.pb.go
+++ b/weed/pb/filer_pb/filer_grpc.pb.go
@@ -31,6 +31,7 @@ type SeaweedFilerClient interface {
 	CollectionList(ctx context.Context, in *CollectionListRequest, opts ...grpc.CallOption) (*CollectionListResponse, error)
 	DeleteCollection(ctx context.Context, in *DeleteCollectionRequest, opts ...grpc.CallOption) (*DeleteCollectionResponse, error)
 	Statistics(ctx context.Context, in *StatisticsRequest, opts ...grpc.CallOption) (*StatisticsResponse, error)
+	Ping(ctx context.Context, in *PingRequest, opts ...grpc.CallOption) (*PingResponse, error)
 	GetFilerConfiguration(ctx context.Context, in *GetFilerConfigurationRequest, opts ...grpc.CallOption) (*GetFilerConfigurationResponse, error)
 	SubscribeMetadata(ctx context.Context, in *SubscribeMetadataRequest, opts ...grpc.CallOption) (SeaweedFiler_SubscribeMetadataClient, error)
 	SubscribeLocalMetadata(ctx context.Context, in *SubscribeMetadataRequest, opts ...grpc.CallOption) (SeaweedFiler_SubscribeLocalMetadataClient, error)
@@ -212,6 +213,15 @@ func (c *seaweedFilerClient) Statistics(ctx context.Context, in *StatisticsReque
 	return out, nil
 }
 
+func (c *seaweedFilerClient) Ping(ctx context.Context, in *PingRequest, opts ...grpc.CallOption) (*PingResponse, error) {
+	out := new(PingResponse)
+	err := c.cc.Invoke(ctx, "/filer_pb.SeaweedFiler/Ping", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 func (c *seaweedFilerClient) GetFilerConfiguration(ctx context.Context, in *GetFilerConfigurationRequest, opts ...grpc.CallOption) (*GetFilerConfigurationResponse, error) {
 	out := new(GetFilerConfigurationResponse)
 	err := c.cc.Invoke(ctx, "/filer_pb.SeaweedFiler/GetFilerConfiguration", in, out, opts...)
@@ -369,6 +379,7 @@ type SeaweedFilerServer interface {
 	CollectionList(context.Context, *CollectionListRequest) (*CollectionListResponse, error)
 	DeleteCollection(context.Context, *DeleteCollectionRequest) (*DeleteCollectionResponse, error)
 	Statistics(context.Context, *StatisticsRequest) (*StatisticsResponse, error)
+	Ping(context.Context, *PingRequest) (*PingResponse, error)
 	GetFilerConfiguration(context.Context, *GetFilerConfigurationRequest) (*GetFilerConfigurationResponse, error)
 	SubscribeMetadata(*SubscribeMetadataRequest, SeaweedFiler_SubscribeMetadataServer) error
 	SubscribeLocalMetadata(*SubscribeMetadataRequest, SeaweedFiler_SubscribeLocalMetadataServer) error
@@ -423,6 +434,9 @@ func (UnimplementedSeaweedFilerServer) DeleteCollection(context.Context, *Delete
 func (UnimplementedSeaweedFilerServer) Statistics(context.Context, *StatisticsRequest) (*StatisticsResponse, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method Statistics not implemented")
 }
+func (UnimplementedSeaweedFilerServer) Ping(context.Context, *PingRequest) (*PingResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method Ping not implemented")
+}
 func (UnimplementedSeaweedFilerServer) GetFilerConfiguration(context.Context, *GetFilerConfigurationRequest) (*GetFilerConfigurationResponse, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method GetFilerConfiguration not implemented")
 }
@@ -700,6 +714,24 @@ func _SeaweedFiler_Statistics_Handler(srv interface{}, ctx context.Context, dec
 	return interceptor(ctx, in, info, handler)
 }
 
+func _SeaweedFiler_Ping_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(PingRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(SeaweedFilerServer).Ping(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/filer_pb.SeaweedFiler/Ping",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(SeaweedFilerServer).Ping(ctx, req.(*PingRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 func _SeaweedFiler_GetFilerConfiguration_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
 	in := new(GetFilerConfigurationRequest)
 	if err := dec(in); err != nil {
@@ -910,6 +942,10 @@ var SeaweedFiler_ServiceDesc = grpc.ServiceDesc{
 			Handler:    _SeaweedFiler_Statistics_Handler,
 		},
 		{
+			MethodName: "Ping",
+			Handler:    _SeaweedFiler_Ping_Handler,
+		},
+		{
 			MethodName: "GetFilerConfiguration",
 			Handler:    _SeaweedFiler_GetFilerConfiguration_Handler,
 		},
diff --git a/weed/pb/grpc_client_server.go b/weed/pb/grpc_client_server.go
index 50feb2e23..d89e61433 100644
--- a/weed/pb/grpc_client_server.go
+++ b/weed/pb/grpc_client_server.go
@@ -4,6 +4,7 @@ import (
 	"context"
 	"fmt"
 	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/pb/volume_server_pb"
 	"github.com/chrislusf/seaweedfs/weed/util"
 	"math/rand"
 	"net/http"
@@ -206,6 +207,14 @@ func WithMasterClient(streamingMode bool, master ServerAddress, grpcDialOption g
 
 }
 
+func WithVolumeServerClient(streamingMode bool, volumeServer ServerAddress, grpcDialOption grpc.DialOption, fn func(client volume_server_pb.VolumeServerClient) error) error {
+	return WithGrpcClient(streamingMode, func(grpcConnection *grpc.ClientConn) error {
+		client := volume_server_pb.NewVolumeServerClient(grpcConnection)
+		return fn(client)
+	}, volumeServer.ToGrpcAddress(), grpcDialOption)
+
+}
+
 func WithOneOfGrpcMasterClients(streamingMode bool, masterGrpcAddresses map[string]ServerAddress, grpcDialOption grpc.DialOption, fn func(client master_pb.SeaweedClient) error) (err error) {
 
 	for _, masterGrpcAddress := range masterGrpcAddresses {
diff --git a/weed/pb/master.proto b/weed/pb/master.proto
index 7a257bb28..2ba5b8b63 100644
--- a/weed/pb/master.proto
+++ b/weed/pb/master.proto
@@ -35,7 +35,8 @@ service Seaweed {
   }
   rpc ReleaseAdminToken (ReleaseAdminTokenRequest) returns (ReleaseAdminTokenResponse) {
   }
-
+  rpc Ping (PingRequest) returns (PingResponse) {
+  }
 }
 
 //////////////////////////////////////////////////
@@ -328,3 +329,10 @@ message ReleaseAdminTokenRequest {
 }
 message ReleaseAdminTokenResponse {
 }
+
+message PingRequest {
+  string target = 1; // default to ping itself
+  string target_type = 2;
+}
+message PingResponse {
+}
diff --git a/weed/pb/master_pb/master.pb.go b/weed/pb/master_pb/master.pb.go
index 681534fc3..31db35d22 100644
--- a/weed/pb/master_pb/master.pb.go
+++ b/weed/pb/master_pb/master.pb.go
@@ -2868,6 +2868,99 @@ func (*ReleaseAdminTokenResponse) Descriptor() ([]byte, []int) {
 	return file_master_proto_rawDescGZIP(), []int{42}
 }
 
+type PingRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Target     string `protobuf:"bytes,1,opt,name=target,proto3" json:"target,omitempty"` // default to ping itself
+	TargetType string `protobuf:"bytes,2,opt,name=target_type,json=targetType,proto3" json:"target_type,omitempty"`
+}
+
+func (x *PingRequest) Reset() {
+	*x = PingRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_master_proto_msgTypes[43]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *PingRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*PingRequest) ProtoMessage() {}
+
+func (x *PingRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_master_proto_msgTypes[43]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use PingRequest.ProtoReflect.Descriptor instead.
+func (*PingRequest) Descriptor() ([]byte, []int) {
+	return file_master_proto_rawDescGZIP(), []int{43}
+}
+
+func (x *PingRequest) GetTarget() string {
+	if x != nil {
+		return x.Target
+	}
+	return ""
+}
+
+func (x *PingRequest) GetTargetType() string {
+	if x != nil {
+		return x.TargetType
+	}
+	return ""
+}
+
+type PingResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+}
+
+func (x *PingResponse) Reset() {
+	*x = PingResponse{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_master_proto_msgTypes[44]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *PingResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*PingResponse) ProtoMessage() {}
+
+func (x *PingResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_master_proto_msgTypes[44]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use PingResponse.ProtoReflect.Descriptor instead.
+func (*PingResponse) Descriptor() ([]byte, []int) {
+	return file_master_proto_rawDescGZIP(), []int{44}
+}
+
 type SuperBlockExtra_ErasureCoding struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -2881,7 +2974,7 @@ type SuperBlockExtra_ErasureCoding struct {
 func (x *SuperBlockExtra_ErasureCoding) Reset() {
 	*x = SuperBlockExtra_ErasureCoding{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_master_proto_msgTypes[45]
+		mi := &file_master_proto_msgTypes[47]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2894,7 +2987,7 @@ func (x *SuperBlockExtra_ErasureCoding) String() string {
 func (*SuperBlockExtra_ErasureCoding) ProtoMessage() {}
 
 func (x *SuperBlockExtra_ErasureCoding) ProtoReflect() protoreflect.Message {
-	mi := &file_master_proto_msgTypes[45]
+	mi := &file_master_proto_msgTypes[47]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2945,7 +3038,7 @@ type LookupVolumeResponse_VolumeIdLocation struct {
 func (x *LookupVolumeResponse_VolumeIdLocation) Reset() {
 	*x = LookupVolumeResponse_VolumeIdLocation{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_master_proto_msgTypes[46]
+		mi := &file_master_proto_msgTypes[48]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2958,7 +3051,7 @@ func (x *LookupVolumeResponse_VolumeIdLocation) String() string {
 func (*LookupVolumeResponse_VolumeIdLocation) ProtoMessage() {}
 
 func (x *LookupVolumeResponse_VolumeIdLocation) ProtoReflect() protoreflect.Message {
-	mi := &file_master_proto_msgTypes[46]
+	mi := &file_master_proto_msgTypes[48]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -3014,7 +3107,7 @@ type LookupEcVolumeResponse_EcShardIdLocation struct {
 func (x *LookupEcVolumeResponse_EcShardIdLocation) Reset() {
 	*x = LookupEcVolumeResponse_EcShardIdLocation{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_master_proto_msgTypes[51]
+		mi := &file_master_proto_msgTypes[53]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -3027,7 +3120,7 @@ func (x *LookupEcVolumeResponse_EcShardIdLocation) String() string {
 func (*LookupEcVolumeResponse_EcShardIdLocation) ProtoMessage() {}
 
 func (x *LookupEcVolumeResponse_EcShardIdLocation) ProtoReflect() protoreflect.Message {
-	mi := &file_master_proto_msgTypes[51]
+	mi := &file_master_proto_msgTypes[53]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -3070,7 +3163,7 @@ type ListClusterNodesResponse_ClusterNode struct {
 func (x *ListClusterNodesResponse_ClusterNode) Reset() {
 	*x = ListClusterNodesResponse_ClusterNode{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_master_proto_msgTypes[52]
+		mi := &file_master_proto_msgTypes[54]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -3083,7 +3176,7 @@ func (x *ListClusterNodesResponse_ClusterNode) String() string {
 func (*ListClusterNodesResponse_ClusterNode) ProtoMessage() {}
 
 func (x *ListClusterNodesResponse_ClusterNode) ProtoReflect() protoreflect.Message {
-	mi := &file_master_proto_msgTypes[52]
+	mi := &file_master_proto_msgTypes[54]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -3607,87 +3700,97 @@ var file_master_proto_rawDesc = []byte{
 	0x6b, 0x5f, 0x6e, 0x61, 0x6d, 0x65, 0x18, 0x03, 0x20, 0x01, 0x28, 0x09, 0x52, 0x08, 0x6c, 0x6f,
 	0x63, 0x6b, 0x4e, 0x61, 0x6d, 0x65, 0x22, 0x1b, 0x0a, 0x19, 0x52, 0x65, 0x6c, 0x65, 0x61, 0x73,
 	0x65, 0x41, 0x64, 0x6d, 0x69, 0x6e, 0x54, 0x6f, 0x6b, 0x65, 0x6e, 0x52, 0x65, 0x73, 0x70, 0x6f,
-	0x6e, 0x73, 0x65, 0x32, 0xce, 0x09, 0x0a, 0x07, 0x53, 0x65, 0x61, 0x77, 0x65, 0x65, 0x64, 0x12,
-	0x49, 0x0a, 0x0d, 0x53, 0x65, 0x6e, 0x64, 0x48, 0x65, 0x61, 0x72, 0x74, 0x62, 0x65, 0x61, 0x74,
-	0x12, 0x14, 0x2e, 0x6d, 0x61, 0x73, 0x74, 0x65, 0x72, 0x5f, 0x70, 0x62, 0x2e, 0x48, 0x65, 0x61,
-	0x72, 0x74, 0x62, 0x65, 0x61, 0x74, 0x1a, 0x1c, 0x2e, 0x6d, 0x61, 0x73, 0x74, 0x65, 0x72, 0x5f,
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+	0x23, 0x2e, 0x6d, 0x61, 0x73, 0x74, 0x65, 0x72, 0x5f, 0x70, 0x62, 0x2e, 0x52, 0x65, 0x6c, 0x65,
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+	0x65, 0x6e, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x22, 0x00, 0x12, 0x39, 0x0a, 0x04,
+	0x50, 0x69, 0x6e, 0x67, 0x12, 0x16, 0x2e, 0x6d, 0x61, 0x73, 0x74, 0x65, 0x72, 0x5f, 0x70, 0x62,
+	0x2e, 0x50, 0x69, 0x6e, 0x67, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x1a, 0x17, 0x2e, 0x6d,
+	0x61, 0x73, 0x74, 0x65, 0x72, 0x5f, 0x70, 0x62, 0x2e, 0x50, 0x69, 0x6e, 0x67, 0x52, 0x65, 0x73,
+	0x70, 0x6f, 0x6e, 0x73, 0x65, 0x22, 0x00, 0x42, 0x32, 0x5a, 0x30, 0x67, 0x69, 0x74, 0x68, 0x75,
+	0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x63, 0x68, 0x72, 0x69, 0x73, 0x6c, 0x75, 0x73, 0x66, 0x2f,
+	0x73, 0x65, 0x61, 0x77, 0x65, 0x65, 0x64, 0x66, 0x73, 0x2f, 0x77, 0x65, 0x65, 0x64, 0x2f, 0x70,
+	0x62, 0x2f, 0x6d, 0x61, 0x73, 0x74, 0x65, 0x72, 0x5f, 0x70, 0x62, 0x62, 0x06, 0x70, 0x72, 0x6f,
+	0x74, 0x6f, 0x33,
 }
 
 var (
@@ -3702,7 +3805,7 @@ func file_master_proto_rawDescGZIP() []byte {
 	return file_master_proto_rawDescData
 }
 
-var file_master_proto_msgTypes = make([]protoimpl.MessageInfo, 53)
+var file_master_proto_msgTypes = make([]protoimpl.MessageInfo, 55)
 var file_master_proto_goTypes = []interface{}{
 	(*Heartbeat)(nil),                             // 0: master_pb.Heartbeat
 	(*HeartbeatResponse)(nil),                     // 1: master_pb.HeartbeatResponse
@@ -3747,16 +3850,18 @@ var file_master_proto_goTypes = []interface{}{
 	(*LeaseAdminTokenResponse)(nil),               // 40: master_pb.LeaseAdminTokenResponse
 	(*ReleaseAdminTokenRequest)(nil),              // 41: master_pb.ReleaseAdminTokenRequest
 	(*ReleaseAdminTokenResponse)(nil),             // 42: master_pb.ReleaseAdminTokenResponse
-	nil,                                           // 43: master_pb.Heartbeat.MaxVolumeCountsEntry
-	nil,                                           // 44: master_pb.StorageBackend.PropertiesEntry
-	(*SuperBlockExtra_ErasureCoding)(nil),         // 45: master_pb.SuperBlockExtra.ErasureCoding
-	(*LookupVolumeResponse_VolumeIdLocation)(nil), // 46: master_pb.LookupVolumeResponse.VolumeIdLocation
-	nil, // 47: master_pb.DataNodeInfo.DiskInfosEntry
-	nil, // 48: master_pb.RackInfo.DiskInfosEntry
-	nil, // 49: master_pb.DataCenterInfo.DiskInfosEntry
-	nil, // 50: master_pb.TopologyInfo.DiskInfosEntry
-	(*LookupEcVolumeResponse_EcShardIdLocation)(nil), // 51: master_pb.LookupEcVolumeResponse.EcShardIdLocation
-	(*ListClusterNodesResponse_ClusterNode)(nil),     // 52: master_pb.ListClusterNodesResponse.ClusterNode
+	(*PingRequest)(nil),                           // 43: master_pb.PingRequest
+	(*PingResponse)(nil),                          // 44: master_pb.PingResponse
+	nil,                                           // 45: master_pb.Heartbeat.MaxVolumeCountsEntry
+	nil,                                           // 46: master_pb.StorageBackend.PropertiesEntry
+	(*SuperBlockExtra_ErasureCoding)(nil),         // 47: master_pb.SuperBlockExtra.ErasureCoding
+	(*LookupVolumeResponse_VolumeIdLocation)(nil), // 48: master_pb.LookupVolumeResponse.VolumeIdLocation
+	nil, // 49: master_pb.DataNodeInfo.DiskInfosEntry
+	nil, // 50: master_pb.RackInfo.DiskInfosEntry
+	nil, // 51: master_pb.DataCenterInfo.DiskInfosEntry
+	nil, // 52: master_pb.TopologyInfo.DiskInfosEntry
+	(*LookupEcVolumeResponse_EcShardIdLocation)(nil), // 53: master_pb.LookupEcVolumeResponse.EcShardIdLocation
+	(*ListClusterNodesResponse_ClusterNode)(nil),     // 54: master_pb.ListClusterNodesResponse.ClusterNode
 }
 var file_master_proto_depIdxs = []int32{
 	2,  // 0: master_pb.Heartbeat.volumes:type_name -> master_pb.VolumeInformationMessage
@@ -3765,29 +3870,29 @@ var file_master_proto_depIdxs = []int32{
 	4,  // 3: master_pb.Heartbeat.ec_shards:type_name -> master_pb.VolumeEcShardInformationMessage
 	4,  // 4: master_pb.Heartbeat.new_ec_shards:type_name -> master_pb.VolumeEcShardInformationMessage
 	4,  // 5: master_pb.Heartbeat.deleted_ec_shards:type_name -> master_pb.VolumeEcShardInformationMessage
-	43, // 6: master_pb.Heartbeat.max_volume_counts:type_name -> master_pb.Heartbeat.MaxVolumeCountsEntry
+	45, // 6: master_pb.Heartbeat.max_volume_counts:type_name -> master_pb.Heartbeat.MaxVolumeCountsEntry
 	5,  // 7: master_pb.HeartbeatResponse.storage_backends:type_name -> master_pb.StorageBackend
-	44, // 8: master_pb.StorageBackend.properties:type_name -> master_pb.StorageBackend.PropertiesEntry
-	45, // 9: master_pb.SuperBlockExtra.erasure_coding:type_name -> master_pb.SuperBlockExtra.ErasureCoding
+	46, // 8: master_pb.StorageBackend.properties:type_name -> master_pb.StorageBackend.PropertiesEntry
+	47, // 9: master_pb.SuperBlockExtra.erasure_coding:type_name -> master_pb.SuperBlockExtra.ErasureCoding
 	9,  // 10: master_pb.KeepConnectedResponse.volume_location:type_name -> master_pb.VolumeLocation
 	10, // 11: master_pb.KeepConnectedResponse.cluster_node_update:type_name -> master_pb.ClusterNodeUpdate
-	46, // 12: master_pb.LookupVolumeResponse.volume_id_locations:type_name -> master_pb.LookupVolumeResponse.VolumeIdLocation
+	48, // 12: master_pb.LookupVolumeResponse.volume_id_locations:type_name -> master_pb.LookupVolumeResponse.VolumeIdLocation
 	14, // 13: master_pb.AssignResponse.replicas:type_name -> master_pb.Location
 	14, // 14: master_pb.AssignResponse.location:type_name -> master_pb.Location
 	19, // 15: master_pb.CollectionListResponse.collections:type_name -> master_pb.Collection
 	2,  // 16: master_pb.DiskInfo.volume_infos:type_name -> master_pb.VolumeInformationMessage
 	4,  // 17: master_pb.DiskInfo.ec_shard_infos:type_name -> master_pb.VolumeEcShardInformationMessage
-	47, // 18: master_pb.DataNodeInfo.diskInfos:type_name -> master_pb.DataNodeInfo.DiskInfosEntry
+	49, // 18: master_pb.DataNodeInfo.diskInfos:type_name -> master_pb.DataNodeInfo.DiskInfosEntry
 	25, // 19: master_pb.RackInfo.data_node_infos:type_name -> master_pb.DataNodeInfo
-	48, // 20: master_pb.RackInfo.diskInfos:type_name -> master_pb.RackInfo.DiskInfosEntry
+	50, // 20: master_pb.RackInfo.diskInfos:type_name -> master_pb.RackInfo.DiskInfosEntry
 	26, // 21: master_pb.DataCenterInfo.rack_infos:type_name -> master_pb.RackInfo
-	49, // 22: master_pb.DataCenterInfo.diskInfos:type_name -> master_pb.DataCenterInfo.DiskInfosEntry
+	51, // 22: master_pb.DataCenterInfo.diskInfos:type_name -> master_pb.DataCenterInfo.DiskInfosEntry
 	27, // 23: master_pb.TopologyInfo.data_center_infos:type_name -> master_pb.DataCenterInfo
-	50, // 24: master_pb.TopologyInfo.diskInfos:type_name -> master_pb.TopologyInfo.DiskInfosEntry
+	52, // 24: master_pb.TopologyInfo.diskInfos:type_name -> master_pb.TopologyInfo.DiskInfosEntry
 	28, // 25: master_pb.VolumeListResponse.topology_info:type_name -> master_pb.TopologyInfo
-	51, // 26: master_pb.LookupEcVolumeResponse.shard_id_locations:type_name -> master_pb.LookupEcVolumeResponse.EcShardIdLocation
+	53, // 26: master_pb.LookupEcVolumeResponse.shard_id_locations:type_name -> master_pb.LookupEcVolumeResponse.EcShardIdLocation
 	5,  // 27: master_pb.GetMasterConfigurationResponse.storage_backends:type_name -> master_pb.StorageBackend
-	52, // 28: master_pb.ListClusterNodesResponse.cluster_nodes:type_name -> master_pb.ListClusterNodesResponse.ClusterNode
+	54, // 28: master_pb.ListClusterNodesResponse.cluster_nodes:type_name -> master_pb.ListClusterNodesResponse.ClusterNode
 	14, // 29: master_pb.LookupVolumeResponse.VolumeIdLocation.locations:type_name -> master_pb.Location
 	24, // 30: master_pb.DataNodeInfo.DiskInfosEntry.value:type_name -> master_pb.DiskInfo
 	24, // 31: master_pb.RackInfo.DiskInfosEntry.value:type_name -> master_pb.DiskInfo
@@ -3808,22 +3913,24 @@ var file_master_proto_depIdxs = []int32{
 	37, // 46: master_pb.Seaweed.ListClusterNodes:input_type -> master_pb.ListClusterNodesRequest
 	39, // 47: master_pb.Seaweed.LeaseAdminToken:input_type -> master_pb.LeaseAdminTokenRequest
 	41, // 48: master_pb.Seaweed.ReleaseAdminToken:input_type -> master_pb.ReleaseAdminTokenRequest
-	1,  // 49: master_pb.Seaweed.SendHeartbeat:output_type -> master_pb.HeartbeatResponse
-	11, // 50: master_pb.Seaweed.KeepConnected:output_type -> master_pb.KeepConnectedResponse
-	13, // 51: master_pb.Seaweed.LookupVolume:output_type -> master_pb.LookupVolumeResponse
-	16, // 52: master_pb.Seaweed.Assign:output_type -> master_pb.AssignResponse
-	18, // 53: master_pb.Seaweed.Statistics:output_type -> master_pb.StatisticsResponse
-	21, // 54: master_pb.Seaweed.CollectionList:output_type -> master_pb.CollectionListResponse
-	23, // 55: master_pb.Seaweed.CollectionDelete:output_type -> master_pb.CollectionDeleteResponse
-	30, // 56: master_pb.Seaweed.VolumeList:output_type -> master_pb.VolumeListResponse
-	32, // 57: master_pb.Seaweed.LookupEcVolume:output_type -> master_pb.LookupEcVolumeResponse
-	34, // 58: master_pb.Seaweed.VacuumVolume:output_type -> master_pb.VacuumVolumeResponse
-	36, // 59: master_pb.Seaweed.GetMasterConfiguration:output_type -> master_pb.GetMasterConfigurationResponse
-	38, // 60: master_pb.Seaweed.ListClusterNodes:output_type -> master_pb.ListClusterNodesResponse
-	40, // 61: master_pb.Seaweed.LeaseAdminToken:output_type -> master_pb.LeaseAdminTokenResponse
-	42, // 62: master_pb.Seaweed.ReleaseAdminToken:output_type -> master_pb.ReleaseAdminTokenResponse
-	49, // [49:63] is the sub-list for method output_type
-	35, // [35:49] is the sub-list for method input_type
+	43, // 49: master_pb.Seaweed.Ping:input_type -> master_pb.PingRequest
+	1,  // 50: master_pb.Seaweed.SendHeartbeat:output_type -> master_pb.HeartbeatResponse
+	11, // 51: master_pb.Seaweed.KeepConnected:output_type -> master_pb.KeepConnectedResponse
+	13, // 52: master_pb.Seaweed.LookupVolume:output_type -> master_pb.LookupVolumeResponse
+	16, // 53: master_pb.Seaweed.Assign:output_type -> master_pb.AssignResponse
+	18, // 54: master_pb.Seaweed.Statistics:output_type -> master_pb.StatisticsResponse
+	21, // 55: master_pb.Seaweed.CollectionList:output_type -> master_pb.CollectionListResponse
+	23, // 56: master_pb.Seaweed.CollectionDelete:output_type -> master_pb.CollectionDeleteResponse
+	30, // 57: master_pb.Seaweed.VolumeList:output_type -> master_pb.VolumeListResponse
+	32, // 58: master_pb.Seaweed.LookupEcVolume:output_type -> master_pb.LookupEcVolumeResponse
+	34, // 59: master_pb.Seaweed.VacuumVolume:output_type -> master_pb.VacuumVolumeResponse
+	36, // 60: master_pb.Seaweed.GetMasterConfiguration:output_type -> master_pb.GetMasterConfigurationResponse
+	38, // 61: master_pb.Seaweed.ListClusterNodes:output_type -> master_pb.ListClusterNodesResponse
+	40, // 62: master_pb.Seaweed.LeaseAdminToken:output_type -> master_pb.LeaseAdminTokenResponse
+	42, // 63: master_pb.Seaweed.ReleaseAdminToken:output_type -> master_pb.ReleaseAdminTokenResponse
+	44, // 64: master_pb.Seaweed.Ping:output_type -> master_pb.PingResponse
+	50, // [50:65] is the sub-list for method output_type
+	35, // [35:50] is the sub-list for method input_type
 	35, // [35:35] is the sub-list for extension type_name
 	35, // [35:35] is the sub-list for extension extendee
 	0,  // [0:35] is the sub-list for field type_name
@@ -4351,7 +4458,31 @@ func file_master_proto_init() {
 				return nil
 			}
 		}
-		file_master_proto_msgTypes[45].Exporter = func(v interface{}, i int) interface{} {
+		file_master_proto_msgTypes[43].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*PingRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_master_proto_msgTypes[44].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*PingResponse); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_master_proto_msgTypes[47].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*SuperBlockExtra_ErasureCoding); i {
 			case 0:
 				return &v.state
@@ -4363,7 +4494,7 @@ func file_master_proto_init() {
 				return nil
 			}
 		}
-		file_master_proto_msgTypes[46].Exporter = func(v interface{}, i int) interface{} {
+		file_master_proto_msgTypes[48].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*LookupVolumeResponse_VolumeIdLocation); i {
 			case 0:
 				return &v.state
@@ -4375,7 +4506,7 @@ func file_master_proto_init() {
 				return nil
 			}
 		}
-		file_master_proto_msgTypes[51].Exporter = func(v interface{}, i int) interface{} {
+		file_master_proto_msgTypes[53].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*LookupEcVolumeResponse_EcShardIdLocation); i {
 			case 0:
 				return &v.state
@@ -4387,7 +4518,7 @@ func file_master_proto_init() {
 				return nil
 			}
 		}
-		file_master_proto_msgTypes[52].Exporter = func(v interface{}, i int) interface{} {
+		file_master_proto_msgTypes[54].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*ListClusterNodesResponse_ClusterNode); i {
 			case 0:
 				return &v.state
@@ -4406,7 +4537,7 @@ func file_master_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_master_proto_rawDesc,
 			NumEnums:      0,
-			NumMessages:   53,
+			NumMessages:   55,
 			NumExtensions: 0,
 			NumServices:   1,
 		},
diff --git a/weed/pb/master_pb/master_grpc.pb.go b/weed/pb/master_pb/master_grpc.pb.go
index 7046afec6..56057d555 100644
--- a/weed/pb/master_pb/master_grpc.pb.go
+++ b/weed/pb/master_pb/master_grpc.pb.go
@@ -32,6 +32,7 @@ type SeaweedClient interface {
 	ListClusterNodes(ctx context.Context, in *ListClusterNodesRequest, opts ...grpc.CallOption) (*ListClusterNodesResponse, error)
 	LeaseAdminToken(ctx context.Context, in *LeaseAdminTokenRequest, opts ...grpc.CallOption) (*LeaseAdminTokenResponse, error)
 	ReleaseAdminToken(ctx context.Context, in *ReleaseAdminTokenRequest, opts ...grpc.CallOption) (*ReleaseAdminTokenResponse, error)
+	Ping(ctx context.Context, in *PingRequest, opts ...grpc.CallOption) (*PingResponse, error)
 }
 
 type seaweedClient struct {
@@ -212,6 +213,15 @@ func (c *seaweedClient) ReleaseAdminToken(ctx context.Context, in *ReleaseAdminT
 	return out, nil
 }
 
+func (c *seaweedClient) Ping(ctx context.Context, in *PingRequest, opts ...grpc.CallOption) (*PingResponse, error) {
+	out := new(PingResponse)
+	err := c.cc.Invoke(ctx, "/master_pb.Seaweed/Ping", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 // SeaweedServer is the server API for Seaweed service.
 // All implementations must embed UnimplementedSeaweedServer
 // for forward compatibility
@@ -230,6 +240,7 @@ type SeaweedServer interface {
 	ListClusterNodes(context.Context, *ListClusterNodesRequest) (*ListClusterNodesResponse, error)
 	LeaseAdminToken(context.Context, *LeaseAdminTokenRequest) (*LeaseAdminTokenResponse, error)
 	ReleaseAdminToken(context.Context, *ReleaseAdminTokenRequest) (*ReleaseAdminTokenResponse, error)
+	Ping(context.Context, *PingRequest) (*PingResponse, error)
 	mustEmbedUnimplementedSeaweedServer()
 }
 
@@ -279,6 +290,9 @@ func (UnimplementedSeaweedServer) LeaseAdminToken(context.Context, *LeaseAdminTo
 func (UnimplementedSeaweedServer) ReleaseAdminToken(context.Context, *ReleaseAdminTokenRequest) (*ReleaseAdminTokenResponse, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method ReleaseAdminToken not implemented")
 }
+func (UnimplementedSeaweedServer) Ping(context.Context, *PingRequest) (*PingResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method Ping not implemented")
+}
 func (UnimplementedSeaweedServer) mustEmbedUnimplementedSeaweedServer() {}
 
 // UnsafeSeaweedServer may be embedded to opt out of forward compatibility for this service.
@@ -560,6 +574,24 @@ func _Seaweed_ReleaseAdminToken_Handler(srv interface{}, ctx context.Context, de
 	return interceptor(ctx, in, info, handler)
 }
 
+func _Seaweed_Ping_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(PingRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(SeaweedServer).Ping(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/master_pb.Seaweed/Ping",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(SeaweedServer).Ping(ctx, req.(*PingRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 // Seaweed_ServiceDesc is the grpc.ServiceDesc for Seaweed service.
 // It's only intended for direct use with grpc.RegisterService,
 // and not to be introspected or modified (even as a copy)
@@ -615,6 +647,10 @@ var Seaweed_ServiceDesc = grpc.ServiceDesc{
 			MethodName: "ReleaseAdminToken",
 			Handler:    _Seaweed_ReleaseAdminToken_Handler,
 		},
+		{
+			MethodName: "Ping",
+			Handler:    _Seaweed_Ping_Handler,
+		},
 	},
 	Streams: []grpc.StreamDesc{
 		{
diff --git a/weed/pb/mount.proto b/weed/pb/mount.proto
new file mode 100644
index 000000000..ec0847f12
--- /dev/null
+++ b/weed/pb/mount.proto
@@ -0,0 +1,25 @@
+syntax = "proto3";
+
+package messaging_pb;
+
+option go_package = "github.com/chrislusf/seaweedfs/weed/pb/mount_pb";
+option java_package = "seaweedfs.client";
+option java_outer_classname = "MountProto";
+
+//////////////////////////////////////////////////
+
+service SeaweedMount {
+
+    rpc Configure (ConfigureRequest) returns (ConfigureResponse) {
+    }
+
+}
+
+//////////////////////////////////////////////////
+
+message ConfigureRequest {
+    int64 collection_capacity = 1;
+}
+
+message ConfigureResponse {
+}
diff --git a/weed/pb/mount_pb/mount.pb.go b/weed/pb/mount_pb/mount.pb.go
new file mode 100644
index 000000000..cbaf533fe
--- /dev/null
+++ b/weed/pb/mount_pb/mount.pb.go
@@ -0,0 +1,208 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.26.0
+// 	protoc        v3.17.3
+// source: mount.proto
+
+package mount_pb
+
+import (
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+)
+
+const (
+	// Verify that this generated code is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
+	// Verify that runtime/protoimpl is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
+)
+
+type ConfigureRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	CollectionCapacity int64 `protobuf:"varint,1,opt,name=collection_capacity,json=collectionCapacity,proto3" json:"collection_capacity,omitempty"`
+}
+
+func (x *ConfigureRequest) Reset() {
+	*x = ConfigureRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_mount_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *ConfigureRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ConfigureRequest) ProtoMessage() {}
+
+func (x *ConfigureRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_mount_proto_msgTypes[0]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ConfigureRequest.ProtoReflect.Descriptor instead.
+func (*ConfigureRequest) Descriptor() ([]byte, []int) {
+	return file_mount_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *ConfigureRequest) GetCollectionCapacity() int64 {
+	if x != nil {
+		return x.CollectionCapacity
+	}
+	return 0
+}
+
+type ConfigureResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+}
+
+func (x *ConfigureResponse) Reset() {
+	*x = ConfigureResponse{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_mount_proto_msgTypes[1]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *ConfigureResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ConfigureResponse) ProtoMessage() {}
+
+func (x *ConfigureResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_mount_proto_msgTypes[1]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ConfigureResponse.ProtoReflect.Descriptor instead.
+func (*ConfigureResponse) Descriptor() ([]byte, []int) {
+	return file_mount_proto_rawDescGZIP(), []int{1}
+}
+
+var File_mount_proto protoreflect.FileDescriptor
+
+var file_mount_proto_rawDesc = []byte{
+	0x0a, 0x0b, 0x6d, 0x6f, 0x75, 0x6e, 0x74, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12, 0x0c, 0x6d,
+	0x65, 0x73, 0x73, 0x61, 0x67, 0x69, 0x6e, 0x67, 0x5f, 0x70, 0x62, 0x22, 0x43, 0x0a, 0x10, 0x43,
+	0x6f, 0x6e, 0x66, 0x69, 0x67, 0x75, 0x72, 0x65, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x12,
+	0x2f, 0x0a, 0x13, 0x63, 0x6f, 0x6c, 0x6c, 0x65, 0x63, 0x74, 0x69, 0x6f, 0x6e, 0x5f, 0x63, 0x61,
+	0x70, 0x61, 0x63, 0x69, 0x74, 0x79, 0x18, 0x01, 0x20, 0x01, 0x28, 0x03, 0x52, 0x12, 0x63, 0x6f,
+	0x6c, 0x6c, 0x65, 0x63, 0x74, 0x69, 0x6f, 0x6e, 0x43, 0x61, 0x70, 0x61, 0x63, 0x69, 0x74, 0x79,
+	0x22, 0x13, 0x0a, 0x11, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x75, 0x72, 0x65, 0x52, 0x65, 0x73,
+	0x70, 0x6f, 0x6e, 0x73, 0x65, 0x32, 0x5e, 0x0a, 0x0c, 0x53, 0x65, 0x61, 0x77, 0x65, 0x65, 0x64,
+	0x4d, 0x6f, 0x75, 0x6e, 0x74, 0x12, 0x4e, 0x0a, 0x09, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x75,
+	0x72, 0x65, 0x12, 0x1e, 0x2e, 0x6d, 0x65, 0x73, 0x73, 0x61, 0x67, 0x69, 0x6e, 0x67, 0x5f, 0x70,
+	0x62, 0x2e, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x75, 0x72, 0x65, 0x52, 0x65, 0x71, 0x75, 0x65,
+	0x73, 0x74, 0x1a, 0x1f, 0x2e, 0x6d, 0x65, 0x73, 0x73, 0x61, 0x67, 0x69, 0x6e, 0x67, 0x5f, 0x70,
+	0x62, 0x2e, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x75, 0x72, 0x65, 0x52, 0x65, 0x73, 0x70, 0x6f,
+	0x6e, 0x73, 0x65, 0x22, 0x00, 0x42, 0x4f, 0x0a, 0x10, 0x73, 0x65, 0x61, 0x77, 0x65, 0x65, 0x64,
+	0x66, 0x73, 0x2e, 0x63, 0x6c, 0x69, 0x65, 0x6e, 0x74, 0x42, 0x0a, 0x4d, 0x6f, 0x75, 0x6e, 0x74,
+	0x50, 0x72, 0x6f, 0x74, 0x6f, 0x5a, 0x2f, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f,
+	0x6d, 0x2f, 0x63, 0x68, 0x72, 0x69, 0x73, 0x6c, 0x75, 0x73, 0x66, 0x2f, 0x73, 0x65, 0x61, 0x77,
+	0x65, 0x65, 0x64, 0x66, 0x73, 0x2f, 0x77, 0x65, 0x65, 0x64, 0x2f, 0x70, 0x62, 0x2f, 0x6d, 0x6f,
+	0x75, 0x6e, 0x74, 0x5f, 0x70, 0x62, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
+}
+
+var (
+	file_mount_proto_rawDescOnce sync.Once
+	file_mount_proto_rawDescData = file_mount_proto_rawDesc
+)
+
+func file_mount_proto_rawDescGZIP() []byte {
+	file_mount_proto_rawDescOnce.Do(func() {
+		file_mount_proto_rawDescData = protoimpl.X.CompressGZIP(file_mount_proto_rawDescData)
+	})
+	return file_mount_proto_rawDescData
+}
+
+var file_mount_proto_msgTypes = make([]protoimpl.MessageInfo, 2)
+var file_mount_proto_goTypes = []interface{}{
+	(*ConfigureRequest)(nil),  // 0: messaging_pb.ConfigureRequest
+	(*ConfigureResponse)(nil), // 1: messaging_pb.ConfigureResponse
+}
+var file_mount_proto_depIdxs = []int32{
+	0, // 0: messaging_pb.SeaweedMount.Configure:input_type -> messaging_pb.ConfigureRequest
+	1, // 1: messaging_pb.SeaweedMount.Configure:output_type -> messaging_pb.ConfigureResponse
+	1, // [1:2] is the sub-list for method output_type
+	0, // [0:1] is the sub-list for method input_type
+	0, // [0:0] is the sub-list for extension type_name
+	0, // [0:0] is the sub-list for extension extendee
+	0, // [0:0] is the sub-list for field type_name
+}
+
+func init() { file_mount_proto_init() }
+func file_mount_proto_init() {
+	if File_mount_proto != nil {
+		return
+	}
+	if !protoimpl.UnsafeEnabled {
+		file_mount_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*ConfigureRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_mount_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*ConfigureResponse); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_mount_proto_rawDesc,
+			NumEnums:      0,
+			NumMessages:   2,
+			NumExtensions: 0,
+			NumServices:   1,
+		},
+		GoTypes:           file_mount_proto_goTypes,
+		DependencyIndexes: file_mount_proto_depIdxs,
+		MessageInfos:      file_mount_proto_msgTypes,
+	}.Build()
+	File_mount_proto = out.File
+	file_mount_proto_rawDesc = nil
+	file_mount_proto_goTypes = nil
+	file_mount_proto_depIdxs = nil
+}
diff --git a/weed/pb/mount_pb/mount_grpc.pb.go b/weed/pb/mount_pb/mount_grpc.pb.go
new file mode 100644
index 000000000..41737aa21
--- /dev/null
+++ b/weed/pb/mount_pb/mount_grpc.pb.go
@@ -0,0 +1,101 @@
+// Code generated by protoc-gen-go-grpc. DO NOT EDIT.
+
+package mount_pb
+
+import (
+	context "context"
+	grpc "google.golang.org/grpc"
+	codes "google.golang.org/grpc/codes"
+	status "google.golang.org/grpc/status"
+)
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the grpc package it is being compiled against.
+// Requires gRPC-Go v1.32.0 or later.
+const _ = grpc.SupportPackageIsVersion7
+
+// SeaweedMountClient is the client API for SeaweedMount service.
+//
+// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
+type SeaweedMountClient interface {
+	Configure(ctx context.Context, in *ConfigureRequest, opts ...grpc.CallOption) (*ConfigureResponse, error)
+}
+
+type seaweedMountClient struct {
+	cc grpc.ClientConnInterface
+}
+
+func NewSeaweedMountClient(cc grpc.ClientConnInterface) SeaweedMountClient {
+	return &seaweedMountClient{cc}
+}
+
+func (c *seaweedMountClient) Configure(ctx context.Context, in *ConfigureRequest, opts ...grpc.CallOption) (*ConfigureResponse, error) {
+	out := new(ConfigureResponse)
+	err := c.cc.Invoke(ctx, "/messaging_pb.SeaweedMount/Configure", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// SeaweedMountServer is the server API for SeaweedMount service.
+// All implementations must embed UnimplementedSeaweedMountServer
+// for forward compatibility
+type SeaweedMountServer interface {
+	Configure(context.Context, *ConfigureRequest) (*ConfigureResponse, error)
+	mustEmbedUnimplementedSeaweedMountServer()
+}
+
+// UnimplementedSeaweedMountServer must be embedded to have forward compatible implementations.
+type UnimplementedSeaweedMountServer struct {
+}
+
+func (UnimplementedSeaweedMountServer) Configure(context.Context, *ConfigureRequest) (*ConfigureResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method Configure not implemented")
+}
+func (UnimplementedSeaweedMountServer) mustEmbedUnimplementedSeaweedMountServer() {}
+
+// UnsafeSeaweedMountServer may be embedded to opt out of forward compatibility for this service.
+// Use of this interface is not recommended, as added methods to SeaweedMountServer will
+// result in compilation errors.
+type UnsafeSeaweedMountServer interface {
+	mustEmbedUnimplementedSeaweedMountServer()
+}
+
+func RegisterSeaweedMountServer(s grpc.ServiceRegistrar, srv SeaweedMountServer) {
+	s.RegisterService(&SeaweedMount_ServiceDesc, srv)
+}
+
+func _SeaweedMount_Configure_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(ConfigureRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(SeaweedMountServer).Configure(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/messaging_pb.SeaweedMount/Configure",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(SeaweedMountServer).Configure(ctx, req.(*ConfigureRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+// SeaweedMount_ServiceDesc is the grpc.ServiceDesc for SeaweedMount service.
+// It's only intended for direct use with grpc.RegisterService,
+// and not to be introspected or modified (even as a copy)
+var SeaweedMount_ServiceDesc = grpc.ServiceDesc{
+	ServiceName: "messaging_pb.SeaweedMount",
+	HandlerType: (*SeaweedMountServer)(nil),
+	Methods: []grpc.MethodDesc{
+		{
+			MethodName: "Configure",
+			Handler:    _SeaweedMount_Configure_Handler,
+		},
+	},
+	Streams:  []grpc.StreamDesc{},
+	Metadata: "mount.proto",
+}
diff --git a/weed/pb/remote_pb/remote.pb.go b/weed/pb/remote_pb/remote.pb.go
index ba43bd3dd..f746333ff 100644
--- a/weed/pb/remote_pb/remote.pb.go
+++ b/weed/pb/remote_pb/remote.pb.go
@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.26.0
-// 	protoc        v3.6.1
+// 	protoc        v3.17.3
 // source: remote.proto
 
 package remote_pb
diff --git a/weed/pb/server_address.go b/weed/pb/server_address.go
index c7faea4bd..a66d0d831 100644
--- a/weed/pb/server_address.go
+++ b/weed/pb/server_address.go
@@ -89,7 +89,7 @@ func (sa ServerAddresses) ToAddresses() (addresses []ServerAddress) {
 func (sa ServerAddresses) ToAddressMap() (addresses map[string]ServerAddress) {
 	addresses = make(map[string]ServerAddress)
 	for _, address := range sa.ToAddresses() {
-		addresses[address.String()] = address
+		addresses[string(address)] = address
 	}
 	return
 }
diff --git a/weed/pb/volume_server.proto b/weed/pb/volume_server.proto
index b7a3caade..bf45d2bc2 100644
--- a/weed/pb/volume_server.proto
+++ b/weed/pb/volume_server.proto
@@ -107,6 +107,10 @@ service VolumeServer {
 
     rpc VolumeNeedleStatus (VolumeNeedleStatusRequest) returns (VolumeNeedleStatusResponse) {
     }
+
+    rpc Ping (PingRequest) returns (PingResponse) {
+    }
+
 }
 
 //////////////////////////////////////////////////
@@ -573,3 +577,10 @@ message VolumeNeedleStatusResponse {
     uint32 crc = 5;
     string ttl = 6;
 }
+
+message PingRequest {
+    string target = 1; // default to ping itself
+    string target_type = 2;
+}
+message PingResponse {
+}
diff --git a/weed/pb/volume_server_pb/volume_server.pb.go b/weed/pb/volume_server_pb/volume_server.pb.go
index 5ff6aa459..b23f33943 100644
--- a/weed/pb/volume_server_pb/volume_server.pb.go
+++ b/weed/pb/volume_server_pb/volume_server.pb.go
@@ -4870,6 +4870,99 @@ func (x *VolumeNeedleStatusResponse) GetTtl() string {
 	return ""
 }
 
+type PingRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Target     string `protobuf:"bytes,1,opt,name=target,proto3" json:"target,omitempty"` // default to ping itself
+	TargetType string `protobuf:"bytes,2,opt,name=target_type,json=targetType,proto3" json:"target_type,omitempty"`
+}
+
+func (x *PingRequest) Reset() {
+	*x = PingRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_volume_server_proto_msgTypes[86]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *PingRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*PingRequest) ProtoMessage() {}
+
+func (x *PingRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_volume_server_proto_msgTypes[86]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use PingRequest.ProtoReflect.Descriptor instead.
+func (*PingRequest) Descriptor() ([]byte, []int) {
+	return file_volume_server_proto_rawDescGZIP(), []int{86}
+}
+
+func (x *PingRequest) GetTarget() string {
+	if x != nil {
+		return x.Target
+	}
+	return ""
+}
+
+func (x *PingRequest) GetTargetType() string {
+	if x != nil {
+		return x.TargetType
+	}
+	return ""
+}
+
+type PingResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+}
+
+func (x *PingResponse) Reset() {
+	*x = PingResponse{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_volume_server_proto_msgTypes[87]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *PingResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*PingResponse) ProtoMessage() {}
+
+func (x *PingResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_volume_server_proto_msgTypes[87]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use PingResponse.ProtoReflect.Descriptor instead.
+func (*PingResponse) Descriptor() ([]byte, []int) {
+	return file_volume_server_proto_rawDescGZIP(), []int{87}
+}
+
 type FetchAndWriteNeedleRequest_Replica struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -4883,7 +4976,7 @@ type FetchAndWriteNeedleRequest_Replica struct {
 func (x *FetchAndWriteNeedleRequest_Replica) Reset() {
 	*x = FetchAndWriteNeedleRequest_Replica{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_volume_server_proto_msgTypes[86]
+		mi := &file_volume_server_proto_msgTypes[88]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -4896,7 +4989,7 @@ func (x *FetchAndWriteNeedleRequest_Replica) String() string {
 func (*FetchAndWriteNeedleRequest_Replica) ProtoMessage() {}
 
 func (x *FetchAndWriteNeedleRequest_Replica) ProtoReflect() protoreflect.Message {
-	mi := &file_volume_server_proto_msgTypes[86]
+	mi := &file_volume_server_proto_msgTypes[88]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -4946,7 +5039,7 @@ type QueryRequest_Filter struct {
 func (x *QueryRequest_Filter) Reset() {
 	*x = QueryRequest_Filter{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_volume_server_proto_msgTypes[87]
+		mi := &file_volume_server_proto_msgTypes[89]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -4959,7 +5052,7 @@ func (x *QueryRequest_Filter) String() string {
 func (*QueryRequest_Filter) ProtoMessage() {}
 
 func (x *QueryRequest_Filter) ProtoReflect() protoreflect.Message {
-	mi := &file_volume_server_proto_msgTypes[87]
+	mi := &file_volume_server_proto_msgTypes[89]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -5011,7 +5104,7 @@ type QueryRequest_InputSerialization struct {
 func (x *QueryRequest_InputSerialization) Reset() {
 	*x = QueryRequest_InputSerialization{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_volume_server_proto_msgTypes[88]
+		mi := &file_volume_server_proto_msgTypes[90]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -5024,7 +5117,7 @@ func (x *QueryRequest_InputSerialization) String() string {
 func (*QueryRequest_InputSerialization) ProtoMessage() {}
 
 func (x *QueryRequest_InputSerialization) ProtoReflect() protoreflect.Message {
-	mi := &file_volume_server_proto_msgTypes[88]
+	mi := &file_volume_server_proto_msgTypes[90]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -5080,7 +5173,7 @@ type QueryRequest_OutputSerialization struct {
 func (x *QueryRequest_OutputSerialization) Reset() {
 	*x = QueryRequest_OutputSerialization{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_volume_server_proto_msgTypes[89]
+		mi := &file_volume_server_proto_msgTypes[91]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -5093,7 +5186,7 @@ func (x *QueryRequest_OutputSerialization) String() string {
 func (*QueryRequest_OutputSerialization) ProtoMessage() {}
 
 func (x *QueryRequest_OutputSerialization) ProtoReflect() protoreflect.Message {
-	mi := &file_volume_server_proto_msgTypes[89]
+	mi := &file_volume_server_proto_msgTypes[91]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -5141,7 +5234,7 @@ type QueryRequest_InputSerialization_CSVInput struct {
 func (x *QueryRequest_InputSerialization_CSVInput) Reset() {
 	*x = QueryRequest_InputSerialization_CSVInput{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_volume_server_proto_msgTypes[90]
+		mi := &file_volume_server_proto_msgTypes[92]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -5154,7 +5247,7 @@ func (x *QueryRequest_InputSerialization_CSVInput) String() string {
 func (*QueryRequest_InputSerialization_CSVInput) ProtoMessage() {}
 
 func (x *QueryRequest_InputSerialization_CSVInput) ProtoReflect() protoreflect.Message {
-	mi := &file_volume_server_proto_msgTypes[90]
+	mi := &file_volume_server_proto_msgTypes[92]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -5230,7 +5323,7 @@ type QueryRequest_InputSerialization_JSONInput struct {
 func (x *QueryRequest_InputSerialization_JSONInput) Reset() {
 	*x = QueryRequest_InputSerialization_JSONInput{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_volume_server_proto_msgTypes[91]
+		mi := &file_volume_server_proto_msgTypes[93]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -5243,7 +5336,7 @@ func (x *QueryRequest_InputSerialization_JSONInput) String() string {
 func (*QueryRequest_InputSerialization_JSONInput) ProtoMessage() {}
 
 func (x *QueryRequest_InputSerialization_JSONInput) ProtoReflect() protoreflect.Message {
-	mi := &file_volume_server_proto_msgTypes[91]
+	mi := &file_volume_server_proto_msgTypes[93]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -5275,7 +5368,7 @@ type QueryRequest_InputSerialization_ParquetInput struct {
 func (x *QueryRequest_InputSerialization_ParquetInput) Reset() {
 	*x = QueryRequest_InputSerialization_ParquetInput{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_volume_server_proto_msgTypes[92]
+		mi := &file_volume_server_proto_msgTypes[94]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -5288,7 +5381,7 @@ func (x *QueryRequest_InputSerialization_ParquetInput) String() string {
 func (*QueryRequest_InputSerialization_ParquetInput) ProtoMessage() {}
 
 func (x *QueryRequest_InputSerialization_ParquetInput) ProtoReflect() protoreflect.Message {
-	mi := &file_volume_server_proto_msgTypes[92]
+	mi := &file_volume_server_proto_msgTypes[94]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -5319,7 +5412,7 @@ type QueryRequest_OutputSerialization_CSVOutput struct {
 func (x *QueryRequest_OutputSerialization_CSVOutput) Reset() {
 	*x = QueryRequest_OutputSerialization_CSVOutput{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_volume_server_proto_msgTypes[93]
+		mi := &file_volume_server_proto_msgTypes[95]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -5332,7 +5425,7 @@ func (x *QueryRequest_OutputSerialization_CSVOutput) String() string {
 func (*QueryRequest_OutputSerialization_CSVOutput) ProtoMessage() {}
 
 func (x *QueryRequest_OutputSerialization_CSVOutput) ProtoReflect() protoreflect.Message {
-	mi := &file_volume_server_proto_msgTypes[93]
+	mi := &file_volume_server_proto_msgTypes[95]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -5394,7 +5487,7 @@ type QueryRequest_OutputSerialization_JSONOutput struct {
 func (x *QueryRequest_OutputSerialization_JSONOutput) Reset() {
 	*x = QueryRequest_OutputSerialization_JSONOutput{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_volume_server_proto_msgTypes[94]
+		mi := &file_volume_server_proto_msgTypes[96]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -5407,7 +5500,7 @@ func (x *QueryRequest_OutputSerialization_JSONOutput) String() string {
 func (*QueryRequest_OutputSerialization_JSONOutput) ProtoMessage() {}
 
 func (x *QueryRequest_OutputSerialization_JSONOutput) ProtoReflect() protoreflect.Message {
-	mi := &file_volume_server_proto_msgTypes[94]
+	mi := &file_volume_server_proto_msgTypes[96]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -6064,292 +6157,302 @@ var file_volume_server_proto_rawDesc = []byte{
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 }
 
 var (
@@ -6364,7 +6467,7 @@ func file_volume_server_proto_rawDescGZIP() []byte {
 	return file_volume_server_proto_rawDescData
 }
 
-var file_volume_server_proto_msgTypes = make([]protoimpl.MessageInfo, 95)
+var file_volume_server_proto_msgTypes = make([]protoimpl.MessageInfo, 97)
 var file_volume_server_proto_goTypes = []interface{}{
 	(*BatchDeleteRequest)(nil),                           // 0: volume_server_pb.BatchDeleteRequest
 	(*BatchDeleteResponse)(nil),                          // 1: volume_server_pb.BatchDeleteResponse
@@ -6452,34 +6555,36 @@ var file_volume_server_proto_goTypes = []interface{}{
 	(*QueriedStripe)(nil),                                // 83: volume_server_pb.QueriedStripe
 	(*VolumeNeedleStatusRequest)(nil),                    // 84: volume_server_pb.VolumeNeedleStatusRequest
 	(*VolumeNeedleStatusResponse)(nil),                   // 85: volume_server_pb.VolumeNeedleStatusResponse
-	(*FetchAndWriteNeedleRequest_Replica)(nil),           // 86: volume_server_pb.FetchAndWriteNeedleRequest.Replica
-	(*QueryRequest_Filter)(nil),                          // 87: volume_server_pb.QueryRequest.Filter
-	(*QueryRequest_InputSerialization)(nil),              // 88: volume_server_pb.QueryRequest.InputSerialization
-	(*QueryRequest_OutputSerialization)(nil),             // 89: volume_server_pb.QueryRequest.OutputSerialization
-	(*QueryRequest_InputSerialization_CSVInput)(nil),     // 90: volume_server_pb.QueryRequest.InputSerialization.CSVInput
-	(*QueryRequest_InputSerialization_JSONInput)(nil),    // 91: volume_server_pb.QueryRequest.InputSerialization.JSONInput
-	(*QueryRequest_InputSerialization_ParquetInput)(nil), // 92: volume_server_pb.QueryRequest.InputSerialization.ParquetInput
-	(*QueryRequest_OutputSerialization_CSVOutput)(nil),   // 93: volume_server_pb.QueryRequest.OutputSerialization.CSVOutput
-	(*QueryRequest_OutputSerialization_JSONOutput)(nil),  // 94: volume_server_pb.QueryRequest.OutputSerialization.JSONOutput
-	(*remote_pb.RemoteConf)(nil),                         // 95: remote_pb.RemoteConf
-	(*remote_pb.RemoteStorageLocation)(nil),              // 96: remote_pb.RemoteStorageLocation
+	(*PingRequest)(nil),                                  // 86: volume_server_pb.PingRequest
+	(*PingResponse)(nil),                                 // 87: volume_server_pb.PingResponse
+	(*FetchAndWriteNeedleRequest_Replica)(nil),           // 88: volume_server_pb.FetchAndWriteNeedleRequest.Replica
+	(*QueryRequest_Filter)(nil),                          // 89: volume_server_pb.QueryRequest.Filter
+	(*QueryRequest_InputSerialization)(nil),              // 90: volume_server_pb.QueryRequest.InputSerialization
+	(*QueryRequest_OutputSerialization)(nil),             // 91: volume_server_pb.QueryRequest.OutputSerialization
+	(*QueryRequest_InputSerialization_CSVInput)(nil),     // 92: volume_server_pb.QueryRequest.InputSerialization.CSVInput
+	(*QueryRequest_InputSerialization_JSONInput)(nil),    // 93: volume_server_pb.QueryRequest.InputSerialization.JSONInput
+	(*QueryRequest_InputSerialization_ParquetInput)(nil), // 94: volume_server_pb.QueryRequest.InputSerialization.ParquetInput
+	(*QueryRequest_OutputSerialization_CSVOutput)(nil),   // 95: volume_server_pb.QueryRequest.OutputSerialization.CSVOutput
+	(*QueryRequest_OutputSerialization_JSONOutput)(nil),  // 96: volume_server_pb.QueryRequest.OutputSerialization.JSONOutput
+	(*remote_pb.RemoteConf)(nil),                         // 97: remote_pb.RemoteConf
+	(*remote_pb.RemoteStorageLocation)(nil),              // 98: remote_pb.RemoteStorageLocation
 }
 var file_volume_server_proto_depIdxs = []int32{
 	2,  // 0: volume_server_pb.BatchDeleteResponse.results:type_name -> volume_server_pb.DeleteResult
 	70, // 1: volume_server_pb.VolumeInfo.files:type_name -> volume_server_pb.RemoteFile
 	68, // 2: volume_server_pb.VolumeServerStatusResponse.disk_statuses:type_name -> volume_server_pb.DiskStatus
 	69, // 3: volume_server_pb.VolumeServerStatusResponse.memory_status:type_name -> volume_server_pb.MemStatus
-	86, // 4: volume_server_pb.FetchAndWriteNeedleRequest.replicas:type_name -> volume_server_pb.FetchAndWriteNeedleRequest.Replica
-	95, // 5: volume_server_pb.FetchAndWriteNeedleRequest.remote_conf:type_name -> remote_pb.RemoteConf
-	96, // 6: volume_server_pb.FetchAndWriteNeedleRequest.remote_location:type_name -> remote_pb.RemoteStorageLocation
-	87, // 7: volume_server_pb.QueryRequest.filter:type_name -> volume_server_pb.QueryRequest.Filter
-	88, // 8: volume_server_pb.QueryRequest.input_serialization:type_name -> volume_server_pb.QueryRequest.InputSerialization
-	89, // 9: volume_server_pb.QueryRequest.output_serialization:type_name -> volume_server_pb.QueryRequest.OutputSerialization
-	90, // 10: volume_server_pb.QueryRequest.InputSerialization.csv_input:type_name -> volume_server_pb.QueryRequest.InputSerialization.CSVInput
-	91, // 11: volume_server_pb.QueryRequest.InputSerialization.json_input:type_name -> volume_server_pb.QueryRequest.InputSerialization.JSONInput
-	92, // 12: volume_server_pb.QueryRequest.InputSerialization.parquet_input:type_name -> volume_server_pb.QueryRequest.InputSerialization.ParquetInput
-	93, // 13: volume_server_pb.QueryRequest.OutputSerialization.csv_output:type_name -> volume_server_pb.QueryRequest.OutputSerialization.CSVOutput
-	94, // 14: volume_server_pb.QueryRequest.OutputSerialization.json_output:type_name -> volume_server_pb.QueryRequest.OutputSerialization.JSONOutput
+	88, // 4: volume_server_pb.FetchAndWriteNeedleRequest.replicas:type_name -> volume_server_pb.FetchAndWriteNeedleRequest.Replica
+	97, // 5: volume_server_pb.FetchAndWriteNeedleRequest.remote_conf:type_name -> remote_pb.RemoteConf
+	98, // 6: volume_server_pb.FetchAndWriteNeedleRequest.remote_location:type_name -> remote_pb.RemoteStorageLocation
+	89, // 7: volume_server_pb.QueryRequest.filter:type_name -> volume_server_pb.QueryRequest.Filter
+	90, // 8: volume_server_pb.QueryRequest.input_serialization:type_name -> volume_server_pb.QueryRequest.InputSerialization
+	91, // 9: volume_server_pb.QueryRequest.output_serialization:type_name -> volume_server_pb.QueryRequest.OutputSerialization
+	92, // 10: volume_server_pb.QueryRequest.InputSerialization.csv_input:type_name -> volume_server_pb.QueryRequest.InputSerialization.CSVInput
+	93, // 11: volume_server_pb.QueryRequest.InputSerialization.json_input:type_name -> volume_server_pb.QueryRequest.InputSerialization.JSONInput
+	94, // 12: volume_server_pb.QueryRequest.InputSerialization.parquet_input:type_name -> volume_server_pb.QueryRequest.InputSerialization.ParquetInput
+	95, // 13: volume_server_pb.QueryRequest.OutputSerialization.csv_output:type_name -> volume_server_pb.QueryRequest.OutputSerialization.CSVOutput
+	96, // 14: volume_server_pb.QueryRequest.OutputSerialization.json_output:type_name -> volume_server_pb.QueryRequest.OutputSerialization.JSONOutput
 	0,  // 15: volume_server_pb.VolumeServer.BatchDelete:input_type -> volume_server_pb.BatchDeleteRequest
 	4,  // 16: volume_server_pb.VolumeServer.VacuumVolumeCheck:input_type -> volume_server_pb.VacuumVolumeCheckRequest
 	6,  // 17: volume_server_pb.VolumeServer.VacuumVolumeCompact:input_type -> volume_server_pb.VacuumVolumeCompactRequest
@@ -6520,48 +6625,50 @@ var file_volume_server_proto_depIdxs = []int32{
 	80, // 52: volume_server_pb.VolumeServer.FetchAndWriteNeedle:input_type -> volume_server_pb.FetchAndWriteNeedleRequest
 	82, // 53: volume_server_pb.VolumeServer.Query:input_type -> volume_server_pb.QueryRequest
 	84, // 54: volume_server_pb.VolumeServer.VolumeNeedleStatus:input_type -> volume_server_pb.VolumeNeedleStatusRequest
-	1,  // 55: volume_server_pb.VolumeServer.BatchDelete:output_type -> volume_server_pb.BatchDeleteResponse
-	5,  // 56: volume_server_pb.VolumeServer.VacuumVolumeCheck:output_type -> volume_server_pb.VacuumVolumeCheckResponse
-	7,  // 57: volume_server_pb.VolumeServer.VacuumVolumeCompact:output_type -> volume_server_pb.VacuumVolumeCompactResponse
-	9,  // 58: volume_server_pb.VolumeServer.VacuumVolumeCommit:output_type -> volume_server_pb.VacuumVolumeCommitResponse
-	11, // 59: volume_server_pb.VolumeServer.VacuumVolumeCleanup:output_type -> volume_server_pb.VacuumVolumeCleanupResponse
-	13, // 60: volume_server_pb.VolumeServer.DeleteCollection:output_type -> volume_server_pb.DeleteCollectionResponse
-	15, // 61: volume_server_pb.VolumeServer.AllocateVolume:output_type -> volume_server_pb.AllocateVolumeResponse
-	17, // 62: volume_server_pb.VolumeServer.VolumeSyncStatus:output_type -> volume_server_pb.VolumeSyncStatusResponse
-	19, // 63: volume_server_pb.VolumeServer.VolumeIncrementalCopy:output_type -> volume_server_pb.VolumeIncrementalCopyResponse
-	21, // 64: volume_server_pb.VolumeServer.VolumeMount:output_type -> volume_server_pb.VolumeMountResponse
-	23, // 65: volume_server_pb.VolumeServer.VolumeUnmount:output_type -> volume_server_pb.VolumeUnmountResponse
-	25, // 66: volume_server_pb.VolumeServer.VolumeDelete:output_type -> volume_server_pb.VolumeDeleteResponse
-	27, // 67: volume_server_pb.VolumeServer.VolumeMarkReadonly:output_type -> volume_server_pb.VolumeMarkReadonlyResponse
-	29, // 68: volume_server_pb.VolumeServer.VolumeMarkWritable:output_type -> volume_server_pb.VolumeMarkWritableResponse
-	31, // 69: volume_server_pb.VolumeServer.VolumeConfigure:output_type -> volume_server_pb.VolumeConfigureResponse
-	33, // 70: volume_server_pb.VolumeServer.VolumeStatus:output_type -> volume_server_pb.VolumeStatusResponse
-	35, // 71: volume_server_pb.VolumeServer.VolumeCopy:output_type -> volume_server_pb.VolumeCopyResponse
-	67, // 72: volume_server_pb.VolumeServer.ReadVolumeFileStatus:output_type -> volume_server_pb.ReadVolumeFileStatusResponse
-	37, // 73: volume_server_pb.VolumeServer.CopyFile:output_type -> volume_server_pb.CopyFileResponse
-	39, // 74: volume_server_pb.VolumeServer.ReadNeedleBlob:output_type -> volume_server_pb.ReadNeedleBlobResponse
-	41, // 75: volume_server_pb.VolumeServer.WriteNeedleBlob:output_type -> volume_server_pb.WriteNeedleBlobResponse
-	43, // 76: volume_server_pb.VolumeServer.ReadAllNeedles:output_type -> volume_server_pb.ReadAllNeedlesResponse
-	45, // 77: volume_server_pb.VolumeServer.VolumeTailSender:output_type -> volume_server_pb.VolumeTailSenderResponse
-	47, // 78: volume_server_pb.VolumeServer.VolumeTailReceiver:output_type -> volume_server_pb.VolumeTailReceiverResponse
-	49, // 79: volume_server_pb.VolumeServer.VolumeEcShardsGenerate:output_type -> volume_server_pb.VolumeEcShardsGenerateResponse
-	51, // 80: volume_server_pb.VolumeServer.VolumeEcShardsRebuild:output_type -> volume_server_pb.VolumeEcShardsRebuildResponse
-	53, // 81: volume_server_pb.VolumeServer.VolumeEcShardsCopy:output_type -> volume_server_pb.VolumeEcShardsCopyResponse
-	55, // 82: volume_server_pb.VolumeServer.VolumeEcShardsDelete:output_type -> volume_server_pb.VolumeEcShardsDeleteResponse
-	57, // 83: volume_server_pb.VolumeServer.VolumeEcShardsMount:output_type -> volume_server_pb.VolumeEcShardsMountResponse
-	59, // 84: volume_server_pb.VolumeServer.VolumeEcShardsUnmount:output_type -> volume_server_pb.VolumeEcShardsUnmountResponse
-	61, // 85: volume_server_pb.VolumeServer.VolumeEcShardRead:output_type -> volume_server_pb.VolumeEcShardReadResponse
-	63, // 86: volume_server_pb.VolumeServer.VolumeEcBlobDelete:output_type -> volume_server_pb.VolumeEcBlobDeleteResponse
-	65, // 87: volume_server_pb.VolumeServer.VolumeEcShardsToVolume:output_type -> volume_server_pb.VolumeEcShardsToVolumeResponse
-	73, // 88: volume_server_pb.VolumeServer.VolumeTierMoveDatToRemote:output_type -> volume_server_pb.VolumeTierMoveDatToRemoteResponse
-	75, // 89: volume_server_pb.VolumeServer.VolumeTierMoveDatFromRemote:output_type -> volume_server_pb.VolumeTierMoveDatFromRemoteResponse
-	77, // 90: volume_server_pb.VolumeServer.VolumeServerStatus:output_type -> volume_server_pb.VolumeServerStatusResponse
-	79, // 91: volume_server_pb.VolumeServer.VolumeServerLeave:output_type -> volume_server_pb.VolumeServerLeaveResponse
-	81, // 92: volume_server_pb.VolumeServer.FetchAndWriteNeedle:output_type -> volume_server_pb.FetchAndWriteNeedleResponse
-	83, // 93: volume_server_pb.VolumeServer.Query:output_type -> volume_server_pb.QueriedStripe
-	85, // 94: volume_server_pb.VolumeServer.VolumeNeedleStatus:output_type -> volume_server_pb.VolumeNeedleStatusResponse
-	55, // [55:95] is the sub-list for method output_type
-	15, // [15:55] is the sub-list for method input_type
+	86, // 55: volume_server_pb.VolumeServer.Ping:input_type -> volume_server_pb.PingRequest
+	1,  // 56: volume_server_pb.VolumeServer.BatchDelete:output_type -> volume_server_pb.BatchDeleteResponse
+	5,  // 57: volume_server_pb.VolumeServer.VacuumVolumeCheck:output_type -> volume_server_pb.VacuumVolumeCheckResponse
+	7,  // 58: volume_server_pb.VolumeServer.VacuumVolumeCompact:output_type -> volume_server_pb.VacuumVolumeCompactResponse
+	9,  // 59: volume_server_pb.VolumeServer.VacuumVolumeCommit:output_type -> volume_server_pb.VacuumVolumeCommitResponse
+	11, // 60: volume_server_pb.VolumeServer.VacuumVolumeCleanup:output_type -> volume_server_pb.VacuumVolumeCleanupResponse
+	13, // 61: volume_server_pb.VolumeServer.DeleteCollection:output_type -> volume_server_pb.DeleteCollectionResponse
+	15, // 62: volume_server_pb.VolumeServer.AllocateVolume:output_type -> volume_server_pb.AllocateVolumeResponse
+	17, // 63: volume_server_pb.VolumeServer.VolumeSyncStatus:output_type -> volume_server_pb.VolumeSyncStatusResponse
+	19, // 64: volume_server_pb.VolumeServer.VolumeIncrementalCopy:output_type -> volume_server_pb.VolumeIncrementalCopyResponse
+	21, // 65: volume_server_pb.VolumeServer.VolumeMount:output_type -> volume_server_pb.VolumeMountResponse
+	23, // 66: volume_server_pb.VolumeServer.VolumeUnmount:output_type -> volume_server_pb.VolumeUnmountResponse
+	25, // 67: volume_server_pb.VolumeServer.VolumeDelete:output_type -> volume_server_pb.VolumeDeleteResponse
+	27, // 68: volume_server_pb.VolumeServer.VolumeMarkReadonly:output_type -> volume_server_pb.VolumeMarkReadonlyResponse
+	29, // 69: volume_server_pb.VolumeServer.VolumeMarkWritable:output_type -> volume_server_pb.VolumeMarkWritableResponse
+	31, // 70: volume_server_pb.VolumeServer.VolumeConfigure:output_type -> volume_server_pb.VolumeConfigureResponse
+	33, // 71: volume_server_pb.VolumeServer.VolumeStatus:output_type -> volume_server_pb.VolumeStatusResponse
+	35, // 72: volume_server_pb.VolumeServer.VolumeCopy:output_type -> volume_server_pb.VolumeCopyResponse
+	67, // 73: volume_server_pb.VolumeServer.ReadVolumeFileStatus:output_type -> volume_server_pb.ReadVolumeFileStatusResponse
+	37, // 74: volume_server_pb.VolumeServer.CopyFile:output_type -> volume_server_pb.CopyFileResponse
+	39, // 75: volume_server_pb.VolumeServer.ReadNeedleBlob:output_type -> volume_server_pb.ReadNeedleBlobResponse
+	41, // 76: volume_server_pb.VolumeServer.WriteNeedleBlob:output_type -> volume_server_pb.WriteNeedleBlobResponse
+	43, // 77: volume_server_pb.VolumeServer.ReadAllNeedles:output_type -> volume_server_pb.ReadAllNeedlesResponse
+	45, // 78: volume_server_pb.VolumeServer.VolumeTailSender:output_type -> volume_server_pb.VolumeTailSenderResponse
+	47, // 79: volume_server_pb.VolumeServer.VolumeTailReceiver:output_type -> volume_server_pb.VolumeTailReceiverResponse
+	49, // 80: volume_server_pb.VolumeServer.VolumeEcShardsGenerate:output_type -> volume_server_pb.VolumeEcShardsGenerateResponse
+	51, // 81: volume_server_pb.VolumeServer.VolumeEcShardsRebuild:output_type -> volume_server_pb.VolumeEcShardsRebuildResponse
+	53, // 82: volume_server_pb.VolumeServer.VolumeEcShardsCopy:output_type -> volume_server_pb.VolumeEcShardsCopyResponse
+	55, // 83: volume_server_pb.VolumeServer.VolumeEcShardsDelete:output_type -> volume_server_pb.VolumeEcShardsDeleteResponse
+	57, // 84: volume_server_pb.VolumeServer.VolumeEcShardsMount:output_type -> volume_server_pb.VolumeEcShardsMountResponse
+	59, // 85: volume_server_pb.VolumeServer.VolumeEcShardsUnmount:output_type -> volume_server_pb.VolumeEcShardsUnmountResponse
+	61, // 86: volume_server_pb.VolumeServer.VolumeEcShardRead:output_type -> volume_server_pb.VolumeEcShardReadResponse
+	63, // 87: volume_server_pb.VolumeServer.VolumeEcBlobDelete:output_type -> volume_server_pb.VolumeEcBlobDeleteResponse
+	65, // 88: volume_server_pb.VolumeServer.VolumeEcShardsToVolume:output_type -> volume_server_pb.VolumeEcShardsToVolumeResponse
+	73, // 89: volume_server_pb.VolumeServer.VolumeTierMoveDatToRemote:output_type -> volume_server_pb.VolumeTierMoveDatToRemoteResponse
+	75, // 90: volume_server_pb.VolumeServer.VolumeTierMoveDatFromRemote:output_type -> volume_server_pb.VolumeTierMoveDatFromRemoteResponse
+	77, // 91: volume_server_pb.VolumeServer.VolumeServerStatus:output_type -> volume_server_pb.VolumeServerStatusResponse
+	79, // 92: volume_server_pb.VolumeServer.VolumeServerLeave:output_type -> volume_server_pb.VolumeServerLeaveResponse
+	81, // 93: volume_server_pb.VolumeServer.FetchAndWriteNeedle:output_type -> volume_server_pb.FetchAndWriteNeedleResponse
+	83, // 94: volume_server_pb.VolumeServer.Query:output_type -> volume_server_pb.QueriedStripe
+	85, // 95: volume_server_pb.VolumeServer.VolumeNeedleStatus:output_type -> volume_server_pb.VolumeNeedleStatusResponse
+	87, // 96: volume_server_pb.VolumeServer.Ping:output_type -> volume_server_pb.PingResponse
+	56, // [56:97] is the sub-list for method output_type
+	15, // [15:56] is the sub-list for method input_type
 	15, // [15:15] is the sub-list for extension type_name
 	15, // [15:15] is the sub-list for extension extendee
 	0,  // [0:15] is the sub-list for field type_name
@@ -7606,7 +7713,7 @@ func file_volume_server_proto_init() {
 			}
 		}
 		file_volume_server_proto_msgTypes[86].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*FetchAndWriteNeedleRequest_Replica); i {
+			switch v := v.(*PingRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -7618,7 +7725,7 @@ func file_volume_server_proto_init() {
 			}
 		}
 		file_volume_server_proto_msgTypes[87].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*QueryRequest_Filter); i {
+			switch v := v.(*PingResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -7630,7 +7737,7 @@ func file_volume_server_proto_init() {
 			}
 		}
 		file_volume_server_proto_msgTypes[88].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*QueryRequest_InputSerialization); i {
+			switch v := v.(*FetchAndWriteNeedleRequest_Replica); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -7642,7 +7749,7 @@ func file_volume_server_proto_init() {
 			}
 		}
 		file_volume_server_proto_msgTypes[89].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*QueryRequest_OutputSerialization); i {
+			switch v := v.(*QueryRequest_Filter); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -7654,7 +7761,7 @@ func file_volume_server_proto_init() {
 			}
 		}
 		file_volume_server_proto_msgTypes[90].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*QueryRequest_InputSerialization_CSVInput); i {
+			switch v := v.(*QueryRequest_InputSerialization); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -7666,7 +7773,7 @@ func file_volume_server_proto_init() {
 			}
 		}
 		file_volume_server_proto_msgTypes[91].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*QueryRequest_InputSerialization_JSONInput); i {
+			switch v := v.(*QueryRequest_OutputSerialization); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -7678,7 +7785,7 @@ func file_volume_server_proto_init() {
 			}
 		}
 		file_volume_server_proto_msgTypes[92].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*QueryRequest_InputSerialization_ParquetInput); i {
+			switch v := v.(*QueryRequest_InputSerialization_CSVInput); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -7690,7 +7797,7 @@ func file_volume_server_proto_init() {
 			}
 		}
 		file_volume_server_proto_msgTypes[93].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*QueryRequest_OutputSerialization_CSVOutput); i {
+			switch v := v.(*QueryRequest_InputSerialization_JSONInput); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -7702,6 +7809,30 @@ func file_volume_server_proto_init() {
 			}
 		}
 		file_volume_server_proto_msgTypes[94].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*QueryRequest_InputSerialization_ParquetInput); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_volume_server_proto_msgTypes[95].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*QueryRequest_OutputSerialization_CSVOutput); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_volume_server_proto_msgTypes[96].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*QueryRequest_OutputSerialization_JSONOutput); i {
 			case 0:
 				return &v.state
@@ -7720,7 +7851,7 @@ func file_volume_server_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_volume_server_proto_rawDesc,
 			NumEnums:      0,
-			NumMessages:   95,
+			NumMessages:   97,
 			NumExtensions: 0,
 			NumServices:   1,
 		},
diff --git a/weed/pb/volume_server_pb/volume_server_grpc.pb.go b/weed/pb/volume_server_pb/volume_server_grpc.pb.go
index 3334eb61b..e1b162457 100644
--- a/weed/pb/volume_server_pb/volume_server_grpc.pb.go
+++ b/weed/pb/volume_server_pb/volume_server_grpc.pb.go
@@ -64,6 +64,7 @@ type VolumeServerClient interface {
 	// <experimental> query
 	Query(ctx context.Context, in *QueryRequest, opts ...grpc.CallOption) (VolumeServer_QueryClient, error)
 	VolumeNeedleStatus(ctx context.Context, in *VolumeNeedleStatusRequest, opts ...grpc.CallOption) (*VolumeNeedleStatusResponse, error)
+	Ping(ctx context.Context, in *PingRequest, opts ...grpc.CallOption) (*PingResponse, error)
 }
 
 type volumeServerClient struct {
@@ -664,6 +665,15 @@ func (c *volumeServerClient) VolumeNeedleStatus(ctx context.Context, in *VolumeN
 	return out, nil
 }
 
+func (c *volumeServerClient) Ping(ctx context.Context, in *PingRequest, opts ...grpc.CallOption) (*PingResponse, error) {
+	out := new(PingResponse)
+	err := c.cc.Invoke(ctx, "/volume_server_pb.VolumeServer/Ping", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 // VolumeServerServer is the server API for VolumeServer service.
 // All implementations must embed UnimplementedVolumeServerServer
 // for forward compatibility
@@ -714,6 +724,7 @@ type VolumeServerServer interface {
 	// <experimental> query
 	Query(*QueryRequest, VolumeServer_QueryServer) error
 	VolumeNeedleStatus(context.Context, *VolumeNeedleStatusRequest) (*VolumeNeedleStatusResponse, error)
+	Ping(context.Context, *PingRequest) (*PingResponse, error)
 	mustEmbedUnimplementedVolumeServerServer()
 }
 
@@ -841,6 +852,9 @@ func (UnimplementedVolumeServerServer) Query(*QueryRequest, VolumeServer_QuerySe
 func (UnimplementedVolumeServerServer) VolumeNeedleStatus(context.Context, *VolumeNeedleStatusRequest) (*VolumeNeedleStatusResponse, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method VolumeNeedleStatus not implemented")
 }
+func (UnimplementedVolumeServerServer) Ping(context.Context, *PingRequest) (*PingResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method Ping not implemented")
+}
 func (UnimplementedVolumeServerServer) mustEmbedUnimplementedVolumeServerServer() {}
 
 // UnsafeVolumeServerServer may be embedded to opt out of forward compatibility for this service.
@@ -1604,6 +1618,24 @@ func _VolumeServer_VolumeNeedleStatus_Handler(srv interface{}, ctx context.Conte
 	return interceptor(ctx, in, info, handler)
 }
 
+func _VolumeServer_Ping_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(PingRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(VolumeServerServer).Ping(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/volume_server_pb.VolumeServer/Ping",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(VolumeServerServer).Ping(ctx, req.(*PingRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 // VolumeServer_ServiceDesc is the grpc.ServiceDesc for VolumeServer service.
 // It's only intended for direct use with grpc.RegisterService,
 // and not to be introspected or modified (even as a copy)
@@ -1731,6 +1763,10 @@ var VolumeServer_ServiceDesc = grpc.ServiceDesc{
 			MethodName: "VolumeNeedleStatus",
 			Handler:    _VolumeServer_VolumeNeedleStatus_Handler,
 		},
+		{
+			MethodName: "Ping",
+			Handler:    _VolumeServer_Ping_Handler,
+		},
 	},
 	Streams: []grpc.StreamDesc{
 		{
diff --git a/weed/s3api/s3api_object_handlers.go b/weed/s3api/s3api_object_handlers.go
index 4d6c18a78..190045517 100644
--- a/weed/s3api/s3api_object_handlers.go
+++ b/weed/s3api/s3api_object_handlers.go
@@ -63,7 +63,7 @@ func (s3a *S3ApiServer) PutObjectHandler(w http.ResponseWriter, r *http.Request)
 
 	if r.Header.Get("Expires") != "" {
 		if _, err = time.Parse(http.TimeFormat, r.Header.Get("Expires")); err != nil {
-			s3err.WriteErrorResponse(w, r, s3err.ErrInvalidDigest)
+			s3err.WriteErrorResponse(w, r, s3err.ErrMalformedExpires)
 			return
 		}
 	}
diff --git a/weed/server/filer_grpc_server.go b/weed/server/filer_grpc_server.go
index 5a5714156..67d4aaaaf 100644
--- a/weed/server/filer_grpc_server.go
+++ b/weed/server/filer_grpc_server.go
@@ -3,7 +3,6 @@ package weed_server
 import (
 	"context"
 	"fmt"
-	"github.com/chrislusf/seaweedfs/weed/pb"
 	"os"
 	"path/filepath"
 	"strconv"
@@ -357,128 +356,3 @@ func (fs *FilerServer) DeleteCollection(ctx context.Context, req *filer_pb.Delet
 
 	return &filer_pb.DeleteCollectionResponse{}, err
 }
-
-func (fs *FilerServer) Statistics(ctx context.Context, req *filer_pb.StatisticsRequest) (resp *filer_pb.StatisticsResponse, err error) {
-
-	var output *master_pb.StatisticsResponse
-
-	err = fs.filer.MasterClient.WithClient(false, func(masterClient master_pb.SeaweedClient) error {
-		grpcResponse, grpcErr := masterClient.Statistics(context.Background(), &master_pb.StatisticsRequest{
-			Replication: req.Replication,
-			Collection:  req.Collection,
-			Ttl:         req.Ttl,
-			DiskType:    req.DiskType,
-		})
-		if grpcErr != nil {
-			return grpcErr
-		}
-
-		output = grpcResponse
-		return nil
-	})
-
-	if err != nil {
-		return nil, err
-	}
-
-	return &filer_pb.StatisticsResponse{
-		TotalSize: output.TotalSize,
-		UsedSize:  output.UsedSize,
-		FileCount: output.FileCount,
-	}, nil
-}
-
-func (fs *FilerServer) GetFilerConfiguration(ctx context.Context, req *filer_pb.GetFilerConfigurationRequest) (resp *filer_pb.GetFilerConfigurationResponse, err error) {
-
-	clusterId, _ := fs.filer.Store.KvGet(context.Background(), []byte("clusterId"))
-
-	t := &filer_pb.GetFilerConfigurationResponse{
-		Masters:            pb.ToAddressStringsFromMap(fs.option.Masters),
-		Collection:         fs.option.Collection,
-		Replication:        fs.option.DefaultReplication,
-		MaxMb:              uint32(fs.option.MaxMB),
-		DirBuckets:         fs.filer.DirBucketsPath,
-		Cipher:             fs.filer.Cipher,
-		Signature:          fs.filer.Signature,
-		MetricsAddress:     fs.metricsAddress,
-		MetricsIntervalSec: int32(fs.metricsIntervalSec),
-		Version:            util.Version(),
-		ClusterId:          string(clusterId),
-	}
-
-	glog.V(4).Infof("GetFilerConfiguration: %v", t)
-
-	return t, nil
-}
-
-func (fs *FilerServer) KeepConnected(stream filer_pb.SeaweedFiler_KeepConnectedServer) error {
-
-	req, err := stream.Recv()
-	if err != nil {
-		return err
-	}
-
-	clientName := util.JoinHostPort(req.Name, int(req.GrpcPort))
-	m := make(map[string]bool)
-	for _, tp := range req.Resources {
-		m[tp] = true
-	}
-	fs.brokersLock.Lock()
-	fs.brokers[clientName] = m
-	glog.V(0).Infof("+ broker %v", clientName)
-	fs.brokersLock.Unlock()
-
-	defer func() {
-		fs.brokersLock.Lock()
-		delete(fs.brokers, clientName)
-		glog.V(0).Infof("- broker %v: %v", clientName, err)
-		fs.brokersLock.Unlock()
-	}()
-
-	for {
-		if err := stream.Send(&filer_pb.KeepConnectedResponse{}); err != nil {
-			glog.V(0).Infof("send broker %v: %+v", clientName, err)
-			return err
-		}
-		// println("replied")
-
-		if _, err := stream.Recv(); err != nil {
-			glog.V(0).Infof("recv broker %v: %v", clientName, err)
-			return err
-		}
-		// println("received")
-	}
-
-}
-
-func (fs *FilerServer) LocateBroker(ctx context.Context, req *filer_pb.LocateBrokerRequest) (resp *filer_pb.LocateBrokerResponse, err error) {
-
-	resp = &filer_pb.LocateBrokerResponse{}
-
-	fs.brokersLock.Lock()
-	defer fs.brokersLock.Unlock()
-
-	var localBrokers []*filer_pb.LocateBrokerResponse_Resource
-
-	for b, m := range fs.brokers {
-		if _, found := m[req.Resource]; found {
-			resp.Found = true
-			resp.Resources = []*filer_pb.LocateBrokerResponse_Resource{
-				{
-					GrpcAddresses: b,
-					ResourceCount: int32(len(m)),
-				},
-			}
-			return
-		}
-		localBrokers = append(localBrokers, &filer_pb.LocateBrokerResponse_Resource{
-			GrpcAddresses: b,
-			ResourceCount: int32(len(m)),
-		})
-	}
-
-	resp.Resources = localBrokers
-
-	return resp, nil
-
-}
diff --git a/weed/server/filer_grpc_server_admin.go b/weed/server/filer_grpc_server_admin.go
new file mode 100644
index 000000000..2a6f74eee
--- /dev/null
+++ b/weed/server/filer_grpc_server_admin.go
@@ -0,0 +1,164 @@
+package weed_server
+
+import (
+	"context"
+	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/cluster"
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/volume_server_pb"
+	"github.com/chrislusf/seaweedfs/weed/util"
+)
+
+func (fs *FilerServer) Statistics(ctx context.Context, req *filer_pb.StatisticsRequest) (resp *filer_pb.StatisticsResponse, err error) {
+
+	var output *master_pb.StatisticsResponse
+
+	err = fs.filer.MasterClient.WithClient(false, func(masterClient master_pb.SeaweedClient) error {
+		grpcResponse, grpcErr := masterClient.Statistics(context.Background(), &master_pb.StatisticsRequest{
+			Replication: req.Replication,
+			Collection:  req.Collection,
+			Ttl:         req.Ttl,
+			DiskType:    req.DiskType,
+		})
+		if grpcErr != nil {
+			return grpcErr
+		}
+
+		output = grpcResponse
+		return nil
+	})
+
+	if err != nil {
+		return nil, err
+	}
+
+	return &filer_pb.StatisticsResponse{
+		TotalSize: output.TotalSize,
+		UsedSize:  output.UsedSize,
+		FileCount: output.FileCount,
+	}, nil
+}
+
+func (fs *FilerServer) Ping(ctx context.Context, req *filer_pb.PingRequest) (resp *filer_pb.PingResponse, pingErr error) {
+	resp = &filer_pb.PingResponse{}
+	if req.TargetType == cluster.FilerType {
+		pingErr = pb.WithFilerClient(false, pb.ServerAddress(req.Target), fs.grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
+			_, err := client.Ping(ctx, &filer_pb.PingRequest{})
+			return err
+		})
+	}
+	if req.TargetType == cluster.VolumeServerType {
+		pingErr = pb.WithVolumeServerClient(false, pb.ServerAddress(req.Target), fs.grpcDialOption, func(client volume_server_pb.VolumeServerClient) error {
+			_, err := client.Ping(ctx, &volume_server_pb.PingRequest{})
+			return err
+		})
+	}
+	if req.TargetType == cluster.MasterType {
+		pingErr = pb.WithMasterClient(false, pb.ServerAddress(req.Target), fs.grpcDialOption, func(client master_pb.SeaweedClient) error {
+			_, err := client.Ping(ctx, &master_pb.PingRequest{})
+			return err
+		})
+	}
+	if pingErr != nil {
+		pingErr = fmt.Errorf("ping %s %s: %v", req.TargetType, req.Target, pingErr)
+	}
+	return
+}
+
+func (fs *FilerServer) GetFilerConfiguration(ctx context.Context, req *filer_pb.GetFilerConfigurationRequest) (resp *filer_pb.GetFilerConfigurationResponse, err error) {
+
+	clusterId, _ := fs.filer.Store.KvGet(context.Background(), []byte("clusterId"))
+
+	t := &filer_pb.GetFilerConfigurationResponse{
+		Masters:            pb.ToAddressStringsFromMap(fs.option.Masters),
+		Collection:         fs.option.Collection,
+		Replication:        fs.option.DefaultReplication,
+		MaxMb:              uint32(fs.option.MaxMB),
+		DirBuckets:         fs.filer.DirBucketsPath,
+		Cipher:             fs.filer.Cipher,
+		Signature:          fs.filer.Signature,
+		MetricsAddress:     fs.metricsAddress,
+		MetricsIntervalSec: int32(fs.metricsIntervalSec),
+		Version:            util.Version(),
+		ClusterId:          string(clusterId),
+	}
+
+	glog.V(4).Infof("GetFilerConfiguration: %v", t)
+
+	return t, nil
+}
+
+func (fs *FilerServer) KeepConnected(stream filer_pb.SeaweedFiler_KeepConnectedServer) error {
+
+	req, err := stream.Recv()
+	if err != nil {
+		return err
+	}
+
+	clientName := util.JoinHostPort(req.Name, int(req.GrpcPort))
+	m := make(map[string]bool)
+	for _, tp := range req.Resources {
+		m[tp] = true
+	}
+	fs.brokersLock.Lock()
+	fs.brokers[clientName] = m
+	glog.V(0).Infof("+ broker %v", clientName)
+	fs.brokersLock.Unlock()
+
+	defer func() {
+		fs.brokersLock.Lock()
+		delete(fs.brokers, clientName)
+		glog.V(0).Infof("- broker %v: %v", clientName, err)
+		fs.brokersLock.Unlock()
+	}()
+
+	for {
+		if err := stream.Send(&filer_pb.KeepConnectedResponse{}); err != nil {
+			glog.V(0).Infof("send broker %v: %+v", clientName, err)
+			return err
+		}
+		// println("replied")
+
+		if _, err := stream.Recv(); err != nil {
+			glog.V(0).Infof("recv broker %v: %v", clientName, err)
+			return err
+		}
+		// println("received")
+	}
+
+}
+
+func (fs *FilerServer) LocateBroker(ctx context.Context, req *filer_pb.LocateBrokerRequest) (resp *filer_pb.LocateBrokerResponse, err error) {
+
+	resp = &filer_pb.LocateBrokerResponse{}
+
+	fs.brokersLock.Lock()
+	defer fs.brokersLock.Unlock()
+
+	var localBrokers []*filer_pb.LocateBrokerResponse_Resource
+
+	for b, m := range fs.brokers {
+		if _, found := m[req.Resource]; found {
+			resp.Found = true
+			resp.Resources = []*filer_pb.LocateBrokerResponse_Resource{
+				{
+					GrpcAddresses: b,
+					ResourceCount: int32(len(m)),
+				},
+			}
+			return
+		}
+		localBrokers = append(localBrokers, &filer_pb.LocateBrokerResponse_Resource{
+			GrpcAddresses: b,
+			ResourceCount: int32(len(m)),
+		})
+	}
+
+	resp.Resources = localBrokers
+
+	return resp, nil
+
+}
diff --git a/weed/server/master_grpc_server_admin.go b/weed/server/master_grpc_server_admin.go
index 983606476..153e48129 100644
--- a/weed/server/master_grpc_server_admin.go
+++ b/weed/server/master_grpc_server_admin.go
@@ -3,7 +3,11 @@ package weed_server
 import (
 	"context"
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/cluster"
 	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/volume_server_pb"
 	"math/rand"
 	"sync"
 	"time"
@@ -142,3 +146,29 @@ func (ms *MasterServer) ReleaseAdminToken(ctx context.Context, req *master_pb.Re
 	}
 	return resp, nil
 }
+
+func (ms *MasterServer) Ping(ctx context.Context, req *master_pb.PingRequest) (resp *master_pb.PingResponse, pingErr error) {
+	resp = &master_pb.PingResponse{}
+	if req.TargetType == cluster.FilerType {
+		pingErr = pb.WithFilerClient(false, pb.ServerAddress(req.Target), ms.grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
+			_, err := client.Ping(ctx, &filer_pb.PingRequest{})
+			return err
+		})
+	}
+	if req.TargetType == cluster.VolumeServerType {
+		pingErr = pb.WithVolumeServerClient(false, pb.ServerAddress(req.Target), ms.grpcDialOption, func(client volume_server_pb.VolumeServerClient) error {
+			_, err := client.Ping(ctx, &volume_server_pb.PingRequest{})
+			return err
+		})
+	}
+	if req.TargetType == cluster.MasterType {
+		pingErr = pb.WithMasterClient(false, pb.ServerAddress(req.Target), ms.grpcDialOption, func(client master_pb.SeaweedClient) error {
+			_, err := client.Ping(ctx, &master_pb.PingRequest{})
+			return err
+		})
+	}
+	if pingErr != nil {
+		pingErr = fmt.Errorf("ping %s %s: %v", req.TargetType, req.Target, pingErr)
+	}
+	return
+}
diff --git a/weed/server/volume_grpc_admin.go b/weed/server/volume_grpc_admin.go
index 898c3da12..09da32f7a 100644
--- a/weed/server/volume_grpc_admin.go
+++ b/weed/server/volume_grpc_admin.go
@@ -3,6 +3,10 @@ package weed_server
 import (
 	"context"
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/cluster"
+	"github.com/chrislusf/seaweedfs/weed/pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
 	"path/filepath"
 
 	"github.com/chrislusf/seaweedfs/weed/glog"
@@ -247,3 +251,29 @@ func (vs *VolumeServer) VolumeNeedleStatus(ctx context.Context, req *volume_serv
 	return resp, nil
 
 }
+
+func (vs *VolumeServer) Ping(ctx context.Context, req *volume_server_pb.PingRequest) (resp *volume_server_pb.PingResponse, pingErr error) {
+	resp = &volume_server_pb.PingResponse{}
+	if req.TargetType == cluster.FilerType {
+		pingErr = pb.WithFilerClient(false, pb.ServerAddress(req.Target), vs.grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
+			_, err := client.Ping(ctx, &filer_pb.PingRequest{})
+			return err
+		})
+	}
+	if req.TargetType == cluster.VolumeServerType {
+		pingErr = pb.WithVolumeServerClient(false, pb.ServerAddress(req.Target), vs.grpcDialOption, func(client volume_server_pb.VolumeServerClient) error {
+			_, err := client.Ping(ctx, &volume_server_pb.PingRequest{})
+			return err
+		})
+	}
+	if req.TargetType == cluster.MasterType {
+		pingErr = pb.WithMasterClient(false, pb.ServerAddress(req.Target), vs.grpcDialOption, func(client master_pb.SeaweedClient) error {
+			_, err := client.Ping(ctx, &master_pb.PingRequest{})
+			return err
+		})
+	}
+	if pingErr != nil {
+		pingErr = fmt.Errorf("ping %s %s: %v", req.TargetType, req.Target, pingErr)
+	}
+	return
+}
diff --git a/weed/shell/command_cluster_check.go b/weed/shell/command_cluster_check.go
new file mode 100644
index 000000000..f841bd224
--- /dev/null
+++ b/weed/shell/command_cluster_check.go
@@ -0,0 +1,233 @@
+package shell
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/cluster"
+	"github.com/chrislusf/seaweedfs/weed/pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/volume_server_pb"
+	"io"
+
+	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
+)
+
+func init() {
+	Commands = append(Commands, &commandClusterCheck{})
+}
+
+type commandClusterCheck struct {
+}
+
+func (c *commandClusterCheck) Name() string {
+	return "cluster.check"
+}
+
+func (c *commandClusterCheck) Help() string {
+	return `check current cluster network connectivity
+
+	cluster.check
+
+`
+}
+
+func (c *commandClusterCheck) Do(args []string, commandEnv *CommandEnv, writer io.Writer) (err error) {
+
+	clusterPsCommand := flag.NewFlagSet(c.Name(), flag.ContinueOnError)
+	if err = clusterPsCommand.Parse(args); err != nil {
+		return nil
+	}
+
+	// collect topology information
+	topologyInfo, volumeSizeLimitMb, err := collectTopologyInfo(commandEnv, 0)
+	if err != nil {
+		return err
+	}
+	fmt.Fprintf(writer, "Topology volumeSizeLimit:%d MB%s\n", volumeSizeLimitMb, diskInfosToString(topologyInfo.DiskInfos))
+
+	emptyDiskTypeDiskInfo, emptyDiskTypeFound := topologyInfo.DiskInfos[""]
+	hddDiskTypeDiskInfo, hddDiskTypeFound := topologyInfo.DiskInfos["hdd"]
+	if !emptyDiskTypeFound && !hddDiskTypeFound || emptyDiskTypeDiskInfo.VolumeCount == 0 && hddDiskTypeDiskInfo.VolumeCount == 0 {
+		return fmt.Errorf("Need to a hdd disk type!")
+	}
+
+	// collect filers
+	var filers []pb.ServerAddress
+	err = commandEnv.MasterClient.WithClient(false, func(client master_pb.SeaweedClient) error {
+		resp, err := client.ListClusterNodes(context.Background(), &master_pb.ListClusterNodesRequest{
+			ClientType: cluster.FilerType,
+		})
+
+		for _, node := range resp.ClusterNodes {
+			filers = append(filers, pb.ServerAddress(node.Address))
+		}
+		return err
+	})
+	if err != nil {
+		return
+	}
+	fmt.Fprintf(writer, "the cluster has %d filers: %+v\n", len(filers), filers)
+
+	// collect volume servers
+	var volumeServers []pb.ServerAddress
+	t, _, err := collectTopologyInfo(commandEnv, 0)
+	if err != nil {
+		return err
+	}
+	for _, dc := range t.DataCenterInfos {
+		for _, r := range dc.RackInfos {
+			for _, dn := range r.DataNodeInfos {
+				volumeServers = append(volumeServers, pb.NewServerAddressFromDataNode(dn))
+			}
+		}
+	}
+	fmt.Fprintf(writer, "the cluster has %d volume servers: %+v\n", len(volumeServers), volumeServers)
+
+	// collect all masters
+	var masters []pb.ServerAddress
+	for _, master := range commandEnv.MasterClient.GetMasters() {
+		masters = append(masters, master)
+	}
+
+	// check from master to volume servers
+	for _, master := range masters {
+		for _, volumeServer := range volumeServers {
+			fmt.Fprintf(writer, "checking master %s to volume server %s ... ", string(master), string(volumeServer))
+			err := pb.WithMasterClient(false, master, commandEnv.option.GrpcDialOption, func(client master_pb.SeaweedClient) error {
+				_, err := client.Ping(context.Background(), &master_pb.PingRequest{
+					Target:     string(volumeServer),
+					TargetType: cluster.VolumeServerType,
+				})
+				return err
+			})
+			if err == nil {
+				fmt.Fprintf(writer, "ok\n")
+			} else {
+				fmt.Fprintf(writer, "%v\n", err)
+			}
+		}
+	}
+
+	// check between masters
+	for _, sourceMaster := range masters {
+		for _, targetMaster := range masters {
+			if sourceMaster == targetMaster {
+				continue
+			}
+			fmt.Fprintf(writer, "checking master %s to %s ... ", string(sourceMaster), string(targetMaster))
+			err := pb.WithMasterClient(false, sourceMaster, commandEnv.option.GrpcDialOption, func(client master_pb.SeaweedClient) error {
+				_, err := client.Ping(context.Background(), &master_pb.PingRequest{
+					Target:     string(targetMaster),
+					TargetType: cluster.MasterType,
+				})
+				return err
+			})
+			if err == nil {
+				fmt.Fprintf(writer, "ok\n")
+			} else {
+				fmt.Fprintf(writer, "%v\n", err)
+			}
+		}
+	}
+
+	// check from volume servers to masters
+	for _, volumeServer := range volumeServers {
+		for _, master := range masters {
+			fmt.Fprintf(writer, "checking volume server %s to master %s ... ", string(volumeServer), string(master))
+			err := pb.WithVolumeServerClient(false, volumeServer, commandEnv.option.GrpcDialOption, func(client volume_server_pb.VolumeServerClient) error {
+				_, err := client.Ping(context.Background(), &volume_server_pb.PingRequest{
+					Target:     string(master),
+					TargetType: cluster.MasterType,
+				})
+				return err
+			})
+			if err == nil {
+				fmt.Fprintf(writer, "ok\n")
+			} else {
+				fmt.Fprintf(writer, "%v\n", err)
+			}
+		}
+	}
+
+	// check from filers to masters
+	for _, filer := range filers {
+		for _, master := range masters {
+			fmt.Fprintf(writer, "checking filer %s to master %s ... ", string(filer), string(master))
+			err := pb.WithFilerClient(false, filer, commandEnv.option.GrpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
+				_, err := client.Ping(context.Background(), &filer_pb.PingRequest{
+					Target:     string(master),
+					TargetType: cluster.MasterType,
+				})
+				return err
+			})
+			if err == nil {
+				fmt.Fprintf(writer, "ok\n")
+			} else {
+				fmt.Fprintf(writer, "%v\n", err)
+			}
+		}
+	}
+
+	// check from filers to volume servers
+	for _, filer := range filers {
+		for _, volumeServer := range volumeServers {
+			fmt.Fprintf(writer, "checking filer %s to volume server %s ... ", string(filer), string(volumeServer))
+			err := pb.WithFilerClient(false, filer, commandEnv.option.GrpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
+				_, err := client.Ping(context.Background(), &filer_pb.PingRequest{
+					Target:     string(volumeServer),
+					TargetType: cluster.VolumeServerType,
+				})
+				return err
+			})
+			if err == nil {
+				fmt.Fprintf(writer, "ok\n")
+			} else {
+				fmt.Fprintf(writer, "%v\n", err)
+			}
+		}
+	}
+
+	// check between volume servers
+	for _, sourceVolumeServer := range volumeServers {
+		for _, targetVolumeServer := range volumeServers {
+			if sourceVolumeServer == targetVolumeServer {
+				continue
+			}
+			fmt.Fprintf(writer, "checking volume server %s to %s ... ", string(sourceVolumeServer), string(targetVolumeServer))
+			err := pb.WithVolumeServerClient(false, sourceVolumeServer, commandEnv.option.GrpcDialOption, func(client volume_server_pb.VolumeServerClient) error {
+				_, err := client.Ping(context.Background(), &volume_server_pb.PingRequest{
+					Target:     string(targetVolumeServer),
+					TargetType: cluster.VolumeServerType,
+				})
+				return err
+			})
+			if err == nil {
+				fmt.Fprintf(writer, "ok\n")
+			} else {
+				fmt.Fprintf(writer, "%v\n", err)
+			}
+		}
+	}
+
+	// check between filers, and need to connect to itself
+	for _, sourceFiler := range filers {
+		for _, targetFiler := range filers {
+			fmt.Fprintf(writer, "checking filer %s to %s ... ", string(sourceFiler), string(targetFiler))
+			err := pb.WithFilerClient(false, sourceFiler, commandEnv.option.GrpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
+				_, err := client.Ping(context.Background(), &filer_pb.PingRequest{
+					Target:     string(targetFiler),
+					TargetType: cluster.FilerType,
+				})
+				return err
+			})
+			if err == nil {
+				fmt.Fprintf(writer, "ok\n")
+			} else {
+				fmt.Fprintf(writer, "%v\n", err)
+			}
+		}
+	}
+
+	return nil
+}
diff --git a/weed/shell/command_mount_configure.go b/weed/shell/command_mount_configure.go
new file mode 100644
index 000000000..8c268d35c
--- /dev/null
+++ b/weed/shell/command_mount_configure.go
@@ -0,0 +1,64 @@
+package shell
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/pb/mount_pb"
+	"github.com/chrislusf/seaweedfs/weed/util"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/credentials/insecure"
+	_ "google.golang.org/grpc/resolver/passthrough"
+	"io"
+)
+
+func init() {
+	Commands = append(Commands, &commandMountConfigure{})
+}
+
+type commandMountConfigure struct {
+}
+
+func (c *commandMountConfigure) Name() string {
+	return "mount.configure"
+}
+
+func (c *commandMountConfigure) Help() string {
+	return `configure the mount on current server
+
+	mount.configure -dir=<mount_directory>
+
+	This command connects with local mount via unix socket, so it can only run locally.
+	The "mount_directory" value needs to be exactly the same as how mount was started in "weed mount -dir=<mount_directory>"
+
+`
+}
+
+func (c *commandMountConfigure) Do(args []string, commandEnv *CommandEnv, writer io.Writer) (err error) {
+
+	mountConfigureCommand := flag.NewFlagSet(c.Name(), flag.ContinueOnError)
+	mountDir := mountConfigureCommand.String("dir", "", "the mount directory same as how \"weed mount -dir=<mount_directory>\" was started")
+	mountQuota := mountConfigureCommand.Int("quotaMB", 0, "the quota in MB")
+	if err = mountConfigureCommand.Parse(args); err != nil {
+		return nil
+	}
+
+	mountDirHash := util.HashToInt32([]byte(*mountDir))
+	if mountDirHash < 0 {
+		mountDirHash = -mountDirHash
+	}
+	localSocket := fmt.Sprintf("/tmp/seaweefs-mount-%d.sock", mountDirHash)
+
+	clientConn, err := grpc.Dial("passthrough:///unix://"+localSocket, grpc.WithTransportCredentials(insecure.NewCredentials()))
+	if err != nil {
+		return
+	}
+	defer clientConn.Close()
+
+	client := mount_pb.NewSeaweedMountClient(clientConn)
+	_, err = client.Configure(context.Background(), &mount_pb.ConfigureRequest{
+		CollectionCapacity: int64(*mountQuota) * 1024 * 1024,
+	})
+
+	return
+}
diff --git a/weed/util/constants.go b/weed/util/constants.go
index db2e1e958..41482490c 100644
--- a/weed/util/constants.go
+++ b/weed/util/constants.go
@@ -5,7 +5,7 @@ import (
 )
 
 var (
-	VERSION_NUMBER = fmt.Sprintf("%.02f", 2.96)
+	VERSION_NUMBER = fmt.Sprintf("%.02f", 2.97)
 	VERSION        = sizeLimit + " " + VERSION_NUMBER
 	COMMIT         = ""
 )
diff --git a/weed/util/log_buffer/log_buffer.go b/weed/util/log_buffer/log_buffer.go
index d5e6cb214..422575193 100644
--- a/weed/util/log_buffer/log_buffer.go
+++ b/weed/util/log_buffer/log_buffer.go
@@ -58,9 +58,13 @@ func NewLogBuffer(name string, flushInterval time.Duration, flushFn func(startTi
 
 func (m *LogBuffer) AddToBuffer(partitionKey, data []byte, processingTsNs int64) {
 
+	var toFlush *dataToFlush
 	m.Lock()
 	defer func() {
 		m.Unlock()
+		if toFlush != nil {
+			m.flushChan <- toFlush
+		}
 		if m.notifyFn != nil {
 			m.notifyFn()
 		}
@@ -96,7 +100,7 @@ func (m *LogBuffer) AddToBuffer(partitionKey, data []byte, processingTsNs int64)
 
 	if m.startTime.Add(m.flushInterval).Before(ts) || len(m.buf)-m.pos < size+4 {
 		// glog.V(4).Infof("%s copyToFlush1 start time %v, ts %v, remaining %d bytes", m.name, m.startTime, ts, len(m.buf)-m.pos)
-		m.flushChan <- m.copyToFlush()
+		toFlush = m.copyToFlush()
 		m.startTime = ts
 		if len(m.buf) < size+4 {
 			m.buf = make([]byte, 2*size+4)
@@ -148,8 +152,10 @@ func (m *LogBuffer) loopInterval() {
 			return
 		}
 		toFlush := m.copyToFlush()
-		m.flushChan <- toFlush
 		m.Unlock()
+		if toFlush != nil {
+			m.flushChan <- toFlush
+		}
 	}
 }
 
diff --git a/weed/wdclient/masterclient.go b/weed/wdclient/masterclient.go
index daf74c1be..53236fc6d 100644
--- a/weed/wdclient/masterclient.go
+++ b/weed/wdclient/masterclient.go
@@ -41,6 +41,11 @@ func (mc *MasterClient) GetMaster() pb.ServerAddress {
 	return mc.currentMaster
 }
 
+func (mc *MasterClient) GetMasters() map[string]pb.ServerAddress {
+	mc.WaitUntilConnected()
+	return mc.masters
+}
+
 func (mc *MasterClient) WaitUntilConnected() {
 	for mc.currentMaster == "" {
 		time.Sleep(time.Duration(rand.Int31n(200)) * time.Millisecond)