diff --git a/other/java/client/src/main/java/seaweedfs/client/FilerClient.java b/other/java/client/src/main/java/seaweedfs/client/FilerClient.java
index 84ee66e7d..10d263968 100644
--- a/other/java/client/src/main/java/seaweedfs/client/FilerClient.java
+++ b/other/java/client/src/main/java/seaweedfs/client/FilerClient.java
@@ -368,6 +368,7 @@ public class FilerClient extends FilerGrpcClient {
                 .setPathPrefix(prefix)
                 .setClientName(clientName)
                 .setSinceNs(sinceNs)
+                .setClientId(this.randomClientId)
                 .build()
         );
     }
diff --git a/other/java/client/src/main/java/seaweedfs/client/FilerGrpcClient.java b/other/java/client/src/main/java/seaweedfs/client/FilerGrpcClient.java
index 54e7ccb68..0a2e6332e 100644
--- a/other/java/client/src/main/java/seaweedfs/client/FilerGrpcClient.java
+++ b/other/java/client/src/main/java/seaweedfs/client/FilerGrpcClient.java
@@ -11,6 +11,7 @@ import org.slf4j.LoggerFactory;
 import javax.net.ssl.SSLException;
 import java.util.HashMap;
 import java.util.Map;
+import java.util.Random;
 import java.util.concurrent.TimeUnit;
 
 public class FilerGrpcClient {
@@ -30,6 +31,7 @@ public class FilerGrpcClient {
     public final int VOLUME_SERVER_ACCESS_PUBLIC_URL = 1;
     public final int VOLUME_SERVER_ACCESS_FILER_PROXY = 2;
     public final Map<String, FilerProto.Locations> vidLocations = new HashMap<>();
+    protected int randomClientId;
     private final ManagedChannel channel;
     private final SeaweedFilerGrpc.SeaweedFilerBlockingStub blockingStub;
     private final SeaweedFilerGrpc.SeaweedFilerStub asyncStub;
@@ -62,6 +64,7 @@ public class FilerGrpcClient {
         cipher = filerConfigurationResponse.getCipher();
         collection = filerConfigurationResponse.getCollection();
         replication = filerConfigurationResponse.getReplication();
+        randomClientId = new Random().nextInt();
 
     }
 
diff --git a/other/java/client/src/main/proto/filer.proto b/other/java/client/src/main/proto/filer.proto
index ba5c1c694..3303dc444 100644
--- a/other/java/client/src/main/proto/filer.proto
+++ b/other/java/client/src/main/proto/filer.proto
@@ -329,6 +329,7 @@ message SubscribeMetadataRequest {
     int64 since_ns = 3;
     int32 signature = 4;
     repeated string path_prefixes = 6;
+    int32 client_id = 7;
 }
 message SubscribeMetadataResponse {
     string directory = 1;
diff --git a/unmaintained/load_test/load_test_meta_tail/load_test_meta_tail.go b/unmaintained/load_test/load_test_meta_tail/load_test_meta_tail.go
index faaea9e8d..b866ed249 100644
--- a/unmaintained/load_test/load_test_meta_tail/load_test_meta_tail.go
+++ b/unmaintained/load_test/load_test_meta_tail/load_test_meta_tail.go
@@ -77,7 +77,7 @@ func startGenerateMetadata() {
 
 func startSubscribeMetadata(eachEntryFunc func(event *filer_pb.SubscribeMetadataResponse) error) {
 
-	tailErr := pb.FollowMetadata(pb.ServerAddress(*tailFiler), grpc.WithInsecure(), "tail", *dir, nil, 0, 0, eachEntryFunc, false)
+	tailErr := pb.FollowMetadata(pb.ServerAddress(*tailFiler), grpc.WithInsecure(), "tail", 0, *dir, nil, 0, 0, eachEntryFunc, false)
 
 	if tailErr != nil {
 		fmt.Printf("tail %s: %v\n", *tailFiler, tailErr)
diff --git a/weed/command/filer_backup.go b/weed/command/filer_backup.go
index 9e5041531..0b902f96f 100644
--- a/weed/command/filer_backup.go
+++ b/weed/command/filer_backup.go
@@ -54,8 +54,10 @@ func runFilerBackup(cmd *Command, args []string) bool {
 
 	grpcDialOption := security.LoadClientTLS(util.GetViper(), "grpc.client")
 
+	clientId := util.RandomInt32()
+
 	for {
-		err := doFilerBackup(grpcDialOption, &filerBackupOptions)
+		err := doFilerBackup(grpcDialOption, &filerBackupOptions, clientId)
 		if err != nil {
 			glog.Errorf("backup from %s: %v", *filerBackupOptions.filer, err)
 			time.Sleep(1747 * time.Millisecond)
@@ -69,7 +71,7 @@ const (
 	BackupKeyPrefix = "backup."
 )
 
-func doFilerBackup(grpcDialOption grpc.DialOption, backupOption *FilerBackupOptions) error {
+func doFilerBackup(grpcDialOption grpc.DialOption, backupOption *FilerBackupOptions, clientId int32) error {
 
 	// find data sink
 	config := util.GetViper()
@@ -112,7 +114,7 @@ func doFilerBackup(grpcDialOption grpc.DialOption, backupOption *FilerBackupOpti
 		return setOffset(grpcDialOption, sourceFiler, BackupKeyPrefix, int32(sinkId), lastTsNs)
 	})
 
-	return pb.FollowMetadata(sourceFiler, grpcDialOption, "backup_"+dataSink.GetName(),
+	return pb.FollowMetadata(sourceFiler, grpcDialOption, "backup_"+dataSink.GetName(), clientId,
 		sourcePath, nil, startFrom.UnixNano(), 0, processEventFnWithOffset, false)
 
 }
diff --git a/weed/command/filer_meta_backup.go b/weed/command/filer_meta_backup.go
index d52ed3349..56c7f7a8c 100644
--- a/weed/command/filer_meta_backup.go
+++ b/weed/command/filer_meta_backup.go
@@ -27,7 +27,8 @@ type FilerMetaBackupOptions struct {
 	restart           *bool
 	backupFilerConfig *string
 
-	store filer.FilerStore
+	store    filer.FilerStore
+	clientId int32
 }
 
 func init() {
@@ -36,6 +37,7 @@ func init() {
 	metaBackup.filerDirectory = cmdFilerMetaBackup.Flag.String("filerDir", "/", "a folder on the filer")
 	metaBackup.restart = cmdFilerMetaBackup.Flag.Bool("restart", false, "copy the full metadata before async incremental backup")
 	metaBackup.backupFilerConfig = cmdFilerMetaBackup.Flag.String("config", "", "path to filer.toml specifying backup filer store")
+	metaBackup.clientId = util.RandomInt32()
 }
 
 var cmdFilerMetaBackup = &Command{
@@ -195,7 +197,7 @@ func (metaBackup *FilerMetaBackupOptions) streamMetadataBackup() error {
 		return metaBackup.setOffset(lastTime)
 	})
 
-	return pb.FollowMetadata(pb.ServerAddress(*metaBackup.filerAddress), metaBackup.grpcDialOption, "meta_backup",
+	return pb.FollowMetadata(pb.ServerAddress(*metaBackup.filerAddress), metaBackup.grpcDialOption, "meta_backup", metaBackup.clientId,
 		*metaBackup.filerDirectory, nil, startTime.UnixNano(), 0, processEventFnWithOffset, false)
 
 }
diff --git a/weed/command/filer_meta_tail.go b/weed/command/filer_meta_tail.go
index 26b155440..1158ef1e0 100644
--- a/weed/command/filer_meta_tail.go
+++ b/weed/command/filer_meta_tail.go
@@ -6,7 +6,7 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/pb"
 	"github.com/golang/protobuf/jsonpb"
 	jsoniter "github.com/json-iterator/go"
-	"github.com/olivere/elastic/v7"
+	elastic "github.com/olivere/elastic/v7"
 	"os"
 	"path/filepath"
 	"strings"
@@ -48,6 +48,7 @@ func runFilerMetaTail(cmd *Command, args []string) bool {
 
 	util.LoadConfiguration("security", false)
 	grpcDialOption := security.LoadClientTLS(util.GetViper(), "grpc.client")
+	clientId := util.RandomInt32()
 
 	var filterFunc func(dir, fname string) bool
 	if *tailPattern != "" {
@@ -105,7 +106,7 @@ func runFilerMetaTail(cmd *Command, args []string) bool {
 		}
 	}
 
-	tailErr := pb.FollowMetadata(pb.ServerAddress(*tailFiler), grpcDialOption, "tail",
+	tailErr := pb.FollowMetadata(pb.ServerAddress(*tailFiler), grpcDialOption, "tail", clientId,
 		*tailTarget, nil, time.Now().Add(-*tailStart).UnixNano(), 0,
 		func(resp *filer_pb.SubscribeMetadataResponse) error {
 			if !shouldPrint(resp) {
diff --git a/weed/command/filer_remote_gateway.go b/weed/command/filer_remote_gateway.go
index fa0239558..33454f378 100644
--- a/weed/command/filer_remote_gateway.go
+++ b/weed/command/filer_remote_gateway.go
@@ -28,6 +28,7 @@ type RemoteGatewayOptions struct {
 	mappings    *remote_pb.RemoteStorageMapping
 	remoteConfs map[string]*remote_pb.RemoteConf
 	bucketsDir  string
+	clientId    int32
 }
 
 var _ = filer_pb.FilerClient(&RemoteGatewayOptions{})
@@ -54,6 +55,7 @@ func init() {
 	remoteGatewayOptions.timeAgo = cmdFilerRemoteGateway.Flag.Duration("timeAgo", 0, "start time before now. \"300ms\", \"1.5h\" or \"2h45m\". Valid time units are \"ns\", \"us\" (or \"µs\"), \"ms\", \"s\", \"m\", \"h\"")
 	remoteGatewayOptions.include = cmdFilerRemoteGateway.Flag.String("include", "", "pattens of new bucket names, e.g., s3*")
 	remoteGatewayOptions.exclude = cmdFilerRemoteGateway.Flag.String("exclude", "", "pattens of new bucket names, e.g., local*")
+	remoteGatewayOptions.clientId = util.RandomInt32()
 }
 
 var cmdFilerRemoteGateway = &Command{
diff --git a/weed/command/filer_remote_gateway_buckets.go b/weed/command/filer_remote_gateway_buckets.go
index fc11cdbc5..4f65b5842 100644
--- a/weed/command/filer_remote_gateway_buckets.go
+++ b/weed/command/filer_remote_gateway_buckets.go
@@ -38,7 +38,7 @@ func (option *RemoteGatewayOptions) followBucketUpdatesAndUploadToRemote(filerSo
 
 	lastOffsetTs := collectLastSyncOffset(option, option.grpcDialOption, pb.ServerAddress(*option.filerAddress), option.bucketsDir, *option.timeAgo)
 
-	return pb.FollowMetadata(pb.ServerAddress(*option.filerAddress), option.grpcDialOption, "filer.remote.sync",
+	return pb.FollowMetadata(pb.ServerAddress(*option.filerAddress), option.grpcDialOption, "filer.remote.sync", option.clientId,
 		option.bucketsDir, []string{filer.DirectoryEtcRemote}, lastOffsetTs.UnixNano(), 0, processEventFnWithOffset, false)
 }
 
diff --git a/weed/command/filer_remote_sync.go b/weed/command/filer_remote_sync.go
index 681ea35e9..d6ccf7b79 100644
--- a/weed/command/filer_remote_sync.go
+++ b/weed/command/filer_remote_sync.go
@@ -18,6 +18,7 @@ type RemoteSyncOptions struct {
 	readChunkFromFiler *bool
 	timeAgo            *time.Duration
 	dir                *string
+	clientId           int32
 }
 
 var _ = filer_pb.FilerClient(&RemoteSyncOptions{})
@@ -41,6 +42,7 @@ func init() {
 	remoteSyncOptions.dir = cmdFilerRemoteSynchronize.Flag.String("dir", "", "a mounted directory on filer")
 	remoteSyncOptions.readChunkFromFiler = cmdFilerRemoteSynchronize.Flag.Bool("filerProxy", false, "read file chunks from filer instead of volume servers")
 	remoteSyncOptions.timeAgo = cmdFilerRemoteSynchronize.Flag.Duration("timeAgo", 0, "start time before now, skipping previous metadata changes. \"300ms\", \"1.5h\" or \"2h45m\". Valid time units are \"ns\", \"us\" (or \"µs\"), \"ms\", \"s\", \"m\", \"h\"")
+	remoteSyncOptions.clientId = util.RandomInt32()
 }
 
 var cmdFilerRemoteSynchronize = &Command{
diff --git a/weed/command/filer_remote_sync_dir.go b/weed/command/filer_remote_sync_dir.go
index 947f526bb..ccedc9d80 100644
--- a/weed/command/filer_remote_sync_dir.go
+++ b/weed/command/filer_remote_sync_dir.go
@@ -40,7 +40,7 @@ func followUpdatesAndUploadToRemote(option *RemoteSyncOptions, filerSource *sour
 
 	lastOffsetTs := collectLastSyncOffset(option, option.grpcDialOption, pb.ServerAddress(*option.filerAddress), mountedDir, *option.timeAgo)
 
-	return pb.FollowMetadata(pb.ServerAddress(*option.filerAddress), option.grpcDialOption, "filer.remote.sync",
+	return pb.FollowMetadata(pb.ServerAddress(*option.filerAddress), option.grpcDialOption, "filer.remote.sync", option.clientId,
 		mountedDir, []string{filer.DirectoryEtcRemote}, lastOffsetTs.UnixNano(), 0, processEventFnWithOffset, false)
 }
 
diff --git a/weed/command/filer_sync.go b/weed/command/filer_sync.go
index 230b24a52..326bd1fbe 100644
--- a/weed/command/filer_sync.go
+++ b/weed/command/filer_sync.go
@@ -37,6 +37,7 @@ type SyncOptions struct {
 	bDebug          *bool
 	aProxyByFiler   *bool
 	bProxyByFiler   *bool
+	clientId        int32
 }
 
 var (
@@ -66,6 +67,7 @@ func init() {
 	syncOptions.bDebug = cmdFilerSynchronize.Flag.Bool("b.debug", false, "debug mode to print out filer B received files")
 	syncCpuProfile = cmdFilerSynchronize.Flag.String("cpuprofile", "", "cpu profile output file")
 	syncMemProfile = cmdFilerSynchronize.Flag.String("memprofile", "", "memory profile output file")
+	syncOptions.clientId = util.RandomInt32()
 }
 
 var cmdFilerSynchronize = &Command{
@@ -97,7 +99,7 @@ func runFilerSynchronize(cmd *Command, args []string) bool {
 	filerB := pb.ServerAddress(*syncOptions.filerB)
 	go func() {
 		for {
-			err := doSubscribeFilerMetaChanges(grpcDialOption, filerA, *syncOptions.aPath, *syncOptions.aProxyByFiler, filerB,
+			err := doSubscribeFilerMetaChanges(syncOptions.clientId, grpcDialOption, filerA, *syncOptions.aPath, *syncOptions.aProxyByFiler, filerB,
 				*syncOptions.bPath, *syncOptions.bReplication, *syncOptions.bCollection, *syncOptions.bTtlSec, *syncOptions.bProxyByFiler, *syncOptions.bDiskType, *syncOptions.bDebug)
 			if err != nil {
 				glog.Errorf("sync from %s to %s: %v", *syncOptions.filerA, *syncOptions.filerB, err)
@@ -109,7 +111,7 @@ func runFilerSynchronize(cmd *Command, args []string) bool {
 	if !*syncOptions.isActivePassive {
 		go func() {
 			for {
-				err := doSubscribeFilerMetaChanges(grpcDialOption, filerB, *syncOptions.bPath, *syncOptions.bProxyByFiler, filerA,
+				err := doSubscribeFilerMetaChanges(syncOptions.clientId, grpcDialOption, filerB, *syncOptions.bPath, *syncOptions.bProxyByFiler, filerA,
 					*syncOptions.aPath, *syncOptions.aReplication, *syncOptions.aCollection, *syncOptions.aTtlSec, *syncOptions.aProxyByFiler, *syncOptions.aDiskType, *syncOptions.aDebug)
 				if err != nil {
 					glog.Errorf("sync from %s to %s: %v", *syncOptions.filerB, *syncOptions.filerA, err)
@@ -124,7 +126,7 @@ func runFilerSynchronize(cmd *Command, args []string) bool {
 	return true
 }
 
-func doSubscribeFilerMetaChanges(grpcDialOption grpc.DialOption, sourceFiler pb.ServerAddress, sourcePath string, sourceReadChunkFromFiler bool, targetFiler pb.ServerAddress, targetPath string,
+func doSubscribeFilerMetaChanges(clientId int32, grpcDialOption grpc.DialOption, sourceFiler pb.ServerAddress, sourcePath string, sourceReadChunkFromFiler bool, targetFiler pb.ServerAddress, targetPath string,
 	replicationStr, collection string, ttlSec int, sinkWriteChunkByFiler bool, diskType string, debug bool) error {
 
 	// read source filer signature
@@ -172,7 +174,7 @@ func doSubscribeFilerMetaChanges(grpcDialOption grpc.DialOption, sourceFiler pb.
 		return setOffset(grpcDialOption, targetFiler, SyncKeyPrefix, sourceFilerSignature, lastTsNs)
 	})
 
-	return pb.FollowMetadata(sourceFiler, grpcDialOption, "syncTo_"+string(targetFiler),
+	return pb.FollowMetadata(sourceFiler, grpcDialOption, "syncTo_"+string(targetFiler), clientId,
 		sourcePath, nil, sourceFilerOffsetTsNs, targetFilerSignature, processEventFnWithOffset, false)
 
 }
diff --git a/weed/filesys/meta_cache/meta_cache_subscribe.go b/weed/filesys/meta_cache/meta_cache_subscribe.go
index d94ec0ca7..64a8b76b9 100644
--- a/weed/filesys/meta_cache/meta_cache_subscribe.go
+++ b/weed/filesys/meta_cache/meta_cache_subscribe.go
@@ -58,7 +58,7 @@ func SubscribeMetaEvents(mc *MetaCache, selfSignature int32, client filer_pb.Fil
 	}
 
 	util.RetryForever("followMetaUpdates", func() error {
-		return pb.WithFilerClientFollowMetadata(client, "mount", dir, &lastTsNs, selfSignature, processEventFn, true)
+		return pb.WithFilerClientFollowMetadata(client, "mount", selfSignature, dir, &lastTsNs, selfSignature, processEventFn, true)
 	}, func(err error) bool {
 		glog.Errorf("follow metadata updates: %v", err)
 		return true
diff --git a/weed/pb/filer.proto b/weed/pb/filer.proto
index ba5c1c694..3303dc444 100644
--- a/weed/pb/filer.proto
+++ b/weed/pb/filer.proto
@@ -329,6 +329,7 @@ message SubscribeMetadataRequest {
     int64 since_ns = 3;
     int32 signature = 4;
     repeated string path_prefixes = 6;
+    int32 client_id = 7;
 }
 message SubscribeMetadataResponse {
     string directory = 1;
diff --git a/weed/pb/filer_pb/filer.pb.go b/weed/pb/filer_pb/filer.pb.go
index 99f13a95f..394052a8f 100644
--- a/weed/pb/filer_pb/filer.pb.go
+++ b/weed/pb/filer_pb/filer.pb.go
@@ -2667,6 +2667,7 @@ type SubscribeMetadataRequest struct {
 	SinceNs      int64    `protobuf:"varint,3,opt,name=since_ns,json=sinceNs,proto3" json:"since_ns,omitempty"`
 	Signature    int32    `protobuf:"varint,4,opt,name=signature,proto3" json:"signature,omitempty"`
 	PathPrefixes []string `protobuf:"bytes,6,rep,name=path_prefixes,json=pathPrefixes,proto3" json:"path_prefixes,omitempty"`
+	ClientId     int32    `protobuf:"varint,7,opt,name=client_id,json=clientId,proto3" json:"client_id,omitempty"`
 }
 
 func (x *SubscribeMetadataRequest) Reset() {
@@ -2736,6 +2737,13 @@ func (x *SubscribeMetadataRequest) GetPathPrefixes() []string {
 	return nil
 }
 
+func (x *SubscribeMetadataRequest) GetClientId() int32 {
+	if x != nil {
+		return x.ClientId
+	}
+	return 0
+}
+
 type SubscribeMetadataResponse struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -3980,7 +3988,7 @@ var file_filer_proto_rawDesc = []byte{
 	0x61, 0x6c, 0x53, 0x65, 0x63, 0x12, 0x18, 0x0a, 0x07, 0x76, 0x65, 0x72, 0x73, 0x69, 0x6f, 0x6e,
 	0x18, 0x0b, 0x20, 0x01, 0x28, 0x09, 0x52, 0x07, 0x76, 0x65, 0x72, 0x73, 0x69, 0x6f, 0x6e, 0x12,
 	0x1d, 0x0a, 0x0a, 0x63, 0x6c, 0x75, 0x73, 0x74, 0x65, 0x72, 0x5f, 0x69, 0x64, 0x18, 0x0c, 0x20,
-	0x01, 0x28, 0x09, 0x52, 0x09, 0x63, 0x6c, 0x75, 0x73, 0x74, 0x65, 0x72, 0x49, 0x64, 0x22, 0xba,
+	0x01, 0x28, 0x09, 0x52, 0x09, 0x63, 0x6c, 0x75, 0x73, 0x74, 0x65, 0x72, 0x49, 0x64, 0x22, 0xd7,
 	0x01, 0x0a, 0x18, 0x53, 0x75, 0x62, 0x73, 0x63, 0x72, 0x69, 0x62, 0x65, 0x4d, 0x65, 0x74, 0x61,
 	0x64, 0x61, 0x74, 0x61, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x12, 0x1f, 0x0a, 0x0b, 0x63,
 	0x6c, 0x69, 0x65, 0x6e, 0x74, 0x5f, 0x6e, 0x61, 0x6d, 0x65, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09,
@@ -3992,220 +4000,222 @@ var file_filer_proto_rawDesc = []byte{
 	0x61, 0x74, 0x75, 0x72, 0x65, 0x18, 0x04, 0x20, 0x01, 0x28, 0x05, 0x52, 0x09, 0x73, 0x69, 0x67,
 	0x6e, 0x61, 0x74, 0x75, 0x72, 0x65, 0x12, 0x23, 0x0a, 0x0d, 0x70, 0x61, 0x74, 0x68, 0x5f, 0x70,
 	0x72, 0x65, 0x66, 0x69, 0x78, 0x65, 0x73, 0x18, 0x06, 0x20, 0x03, 0x28, 0x09, 0x52, 0x0c, 0x70,
-	0x61, 0x74, 0x68, 0x50, 0x72, 0x65, 0x66, 0x69, 0x78, 0x65, 0x73, 0x22, 0x9a, 0x01, 0x0a, 0x19,
-	0x53, 0x75, 0x62, 0x73, 0x63, 0x72, 0x69, 0x62, 0x65, 0x4d, 0x65, 0x74, 0x61, 0x64, 0x61, 0x74,
-	0x61, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x12, 0x1c, 0x0a, 0x09, 0x64, 0x69, 0x72,
-	0x65, 0x63, 0x74, 0x6f, 0x72, 0x79, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x09, 0x64, 0x69,
-	0x72, 0x65, 0x63, 0x74, 0x6f, 0x72, 0x79, 0x12, 0x4a, 0x0a, 0x12, 0x65, 0x76, 0x65, 0x6e, 0x74,
-	0x5f, 0x6e, 0x6f, 0x74, 0x69, 0x66, 0x69, 0x63, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x18, 0x02, 0x20,
-	0x01, 0x28, 0x0b, 0x32, 0x1b, 0x2e, 0x66, 0x69, 0x6c, 0x65, 0x72, 0x5f, 0x70, 0x62, 0x2e, 0x45,
-	0x76, 0x65, 0x6e, 0x74, 0x4e, 0x6f, 0x74, 0x69, 0x66, 0x69, 0x63, 0x61, 0x74, 0x69, 0x6f, 0x6e,
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-	0x69, 0x6f, 0x6e, 0x12, 0x13, 0x0a, 0x05, 0x74, 0x73, 0x5f, 0x6e, 0x73, 0x18, 0x03, 0x20, 0x01,
-	0x28, 0x03, 0x52, 0x04, 0x74, 0x73, 0x4e, 0x73, 0x22, 0x61, 0x0a, 0x08, 0x4c, 0x6f, 0x67, 0x45,
-	0x6e, 0x74, 0x72, 0x79, 0x12, 0x13, 0x0a, 0x05, 0x74, 0x73, 0x5f, 0x6e, 0x73, 0x18, 0x01, 0x20,
-	0x01, 0x28, 0x03, 0x52, 0x04, 0x74, 0x73, 0x4e, 0x73, 0x12, 0x2c, 0x0a, 0x12, 0x70, 0x61, 0x72,
-	0x74, 0x69, 0x74, 0x69, 0x6f, 0x6e, 0x5f, 0x6b, 0x65, 0x79, 0x5f, 0x68, 0x61, 0x73, 0x68, 0x18,
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+	0x72, 0x5f, 0x70, 0x62, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
diff --git a/weed/pb/filer_pb_tail.go b/weed/pb/filer_pb_tail.go
index 1db9883a4..1afddc725 100644
--- a/weed/pb/filer_pb_tail.go
+++ b/weed/pb/filer_pb_tail.go
@@ -12,11 +12,11 @@ import (
 
 type ProcessMetadataFunc func(resp *filer_pb.SubscribeMetadataResponse) error
 
-func FollowMetadata(filerAddress ServerAddress, grpcDialOption grpc.DialOption, clientName string,
+func FollowMetadata(filerAddress ServerAddress, grpcDialOption grpc.DialOption, clientName string, clientId int32,
 	pathPrefix string, additionalPathPrefixes []string, lastTsNs int64, selfSignature int32,
 	processEventFn ProcessMetadataFunc, fatalOnError bool) error {
 
-	err := WithFilerClient(true, filerAddress, grpcDialOption, makeFunc(clientName,
+	err := WithFilerClient(true, filerAddress, grpcDialOption, makeFunc(clientName, clientId,
 		pathPrefix, additionalPathPrefixes, &lastTsNs, selfSignature, processEventFn, fatalOnError))
 	if err != nil {
 		return fmt.Errorf("subscribing filer meta change: %v", err)
@@ -25,10 +25,10 @@ func FollowMetadata(filerAddress ServerAddress, grpcDialOption grpc.DialOption,
 }
 
 func WithFilerClientFollowMetadata(filerClient filer_pb.FilerClient,
-	clientName string, pathPrefix string, lastTsNs *int64, selfSignature int32,
+	clientName string, clientId int32, pathPrefix string, lastTsNs *int64, selfSignature int32,
 	processEventFn ProcessMetadataFunc, fatalOnError bool) error {
 
-	err := filerClient.WithFilerClient(true, makeFunc(clientName,
+	err := filerClient.WithFilerClient(true, makeFunc(clientName, clientId,
 		pathPrefix, nil, lastTsNs, selfSignature, processEventFn, fatalOnError))
 	if err != nil {
 		return fmt.Errorf("subscribing filer meta change: %v", err)
@@ -37,7 +37,7 @@ func WithFilerClientFollowMetadata(filerClient filer_pb.FilerClient,
 	return nil
 }
 
-func makeFunc(clientName string, pathPrefix string, additionalPathPrefixes []string, lastTsNs *int64, selfSignature int32,
+func makeFunc(clientName string, clientId int32, pathPrefix string, additionalPathPrefixes []string, lastTsNs *int64, selfSignature int32,
 	processEventFn ProcessMetadataFunc, fatalOnError bool) func(client filer_pb.SeaweedFilerClient) error {
 	return func(client filer_pb.SeaweedFilerClient) error {
 		ctx, cancel := context.WithCancel(context.Background())
@@ -48,6 +48,7 @@ func makeFunc(clientName string, pathPrefix string, additionalPathPrefixes []str
 			PathPrefixes: additionalPathPrefixes,
 			SinceNs:      *lastTsNs,
 			Signature:    selfSignature,
+			ClientId:     clientId,
 		})
 		if err != nil {
 			return fmt.Errorf("subscribe: %v", err)
diff --git a/weed/s3api/auth_credentials_subscribe.go b/weed/s3api/auth_credentials_subscribe.go
index a2a3e807a..bd0b1016d 100644
--- a/weed/s3api/auth_credentials_subscribe.go
+++ b/weed/s3api/auth_credentials_subscribe.go
@@ -33,7 +33,7 @@ func (s3a *S3ApiServer) subscribeMetaEvents(clientName string, prefix string, la
 	}
 
 	util.RetryForever("followIamChanges", func() error {
-		return pb.WithFilerClientFollowMetadata(s3a, clientName, prefix, &lastTsNs, 0, processEventFn, true)
+		return pb.WithFilerClientFollowMetadata(s3a, clientName, s3a.randomClientId, prefix, &lastTsNs, 0, processEventFn, true)
 	}, func(err error) bool {
 		glog.V(0).Infof("iam follow metadata changes: %v", err)
 		return true
diff --git a/weed/s3api/s3api_server.go b/weed/s3api/s3api_server.go
index 1abf9259d..af9cba260 100644
--- a/weed/s3api/s3api_server.go
+++ b/weed/s3api/s3api_server.go
@@ -3,6 +3,7 @@ package s3api
 import (
 	"fmt"
 	"github.com/chrislusf/seaweedfs/weed/pb"
+	"github.com/chrislusf/seaweedfs/weed/util"
 	"net/http"
 	"strings"
 	"time"
@@ -25,14 +26,16 @@ type S3ApiServerOption struct {
 }
 
 type S3ApiServer struct {
-	option *S3ApiServerOption
-	iam    *IdentityAccessManagement
+	option         *S3ApiServerOption
+	iam            *IdentityAccessManagement
+	randomClientId int32
 }
 
 func NewS3ApiServer(router *mux.Router, option *S3ApiServerOption) (s3ApiServer *S3ApiServer, err error) {
 	s3ApiServer = &S3ApiServer{
-		option: option,
-		iam:    NewIdentityAccessManagement(option),
+		option:         option,
+		iam:            NewIdentityAccessManagement(option),
+		randomClientId: util.RandomInt32(),
 	}
 
 	s3ApiServer.registerRouter(router)
diff --git a/weed/server/filer_grpc_server_sub_meta.go b/weed/server/filer_grpc_server_sub_meta.go
index a0c53cae0..db395e3c3 100644
--- a/weed/server/filer_grpc_server_sub_meta.go
+++ b/weed/server/filer_grpc_server_sub_meta.go
@@ -23,9 +23,12 @@ func (fs *FilerServer) SubscribeMetadata(req *filer_pb.SubscribeMetadataRequest,
 
 	peerAddress := findClientAddress(stream.Context(), 0)
 
-	clientName := fs.addClient(req.ClientName, peerAddress)
+	alreadyKnown, clientName := fs.addClient(req.ClientName, peerAddress, req.ClientId)
+	if alreadyKnown {
+		return fmt.Errorf("duplicated subscription detected for client %s id %d", clientName, req.ClientId)
+	}
 
-	defer fs.deleteClient(clientName)
+	defer fs.deleteClient(clientName, req.ClientId)
 
 	lastReadTime := time.Unix(0, req.SinceNs)
 	glog.V(0).Infof(" %v starts to subscribe %s from %+v", clientName, req.PathPrefix, lastReadTime)
@@ -81,9 +84,9 @@ func (fs *FilerServer) SubscribeLocalMetadata(req *filer_pb.SubscribeMetadataReq
 
 	peerAddress := findClientAddress(stream.Context(), 0)
 
-	clientName := fs.addClient(req.ClientName, peerAddress)
+	_, clientName := fs.addClient(req.ClientName, peerAddress, 0)
 
-	defer fs.deleteClient(clientName)
+	defer fs.deleteClient(clientName, 0)
 
 	lastReadTime := time.Unix(0, req.SinceNs)
 	glog.V(0).Infof(" %v local subscribe %s from %+v", clientName, req.PathPrefix, lastReadTime)
@@ -237,12 +240,22 @@ func hasPrefixIn(text string, prefixes []string) bool {
 	return false
 }
 
-func (fs *FilerServer) addClient(clientType string, clientAddress string) (clientName string) {
+func (fs *FilerServer) addClient(clientType string, clientAddress string, clientId int32) (alreadyKnown bool, clientName string) {
 	clientName = clientType + "@" + clientAddress
 	glog.V(0).Infof("+ listener %v", clientName)
+	if clientId != 0 {
+		fs.knownListenersLock.Lock()
+		_, alreadyKnown = fs.knownListeners[clientId]
+		fs.knownListenersLock.Unlock()
+	}
 	return
 }
 
-func (fs *FilerServer) deleteClient(clientName string) {
+func (fs *FilerServer) deleteClient(clientName string, clientId int32) {
 	glog.V(0).Infof("- listener %v", clientName)
+	if clientId != 0 {
+		fs.knownListenersLock.Lock()
+		delete(fs.knownListeners, clientId)
+		fs.knownListenersLock.Unlock()
+	}
 }
diff --git a/weed/server/filer_server.go b/weed/server/filer_server.go
index 1a5f80369..39df11e45 100644
--- a/weed/server/filer_server.go
+++ b/weed/server/filer_server.go
@@ -81,6 +81,10 @@ type FilerServer struct {
 	listenersLock sync.Mutex
 	listenersCond *sync.Cond
 
+	// track known metadata listeners
+	knownListenersLock sync.Mutex
+	knownListeners     map[int32]struct{}
+
 	brokers     map[string]map[string]bool
 	brokersLock sync.Mutex
 
@@ -93,6 +97,7 @@ func NewFilerServer(defaultMux, readonlyMux *http.ServeMux, option *FilerOption)
 	fs = &FilerServer{
 		option:                option,
 		grpcDialOption:        security.LoadClientTLS(util.GetViper(), "grpc.filer"),
+		knownListeners:        make(map[int32]struct{}),
 		brokers:               make(map[string]map[string]bool),
 		inFlightDataLimitCond: sync.NewCond(new(sync.Mutex)),
 	}