metadata subscription uses client epoch

21 files changed, 401 insertions, 406 deletions

diff --git a/other/java/client/src/main/proto/filer.proto b/other/java/client/src/main/proto/filer.proto
index bd0932cb8..6277c3c6e 100644
--- a/other/java/client/src/main/proto/filer.proto
+++ b/other/java/client/src/main/proto/filer.proto
@@ -346,6 +346,7 @@ message SubscribeMetadataRequest {
     repeated string path_prefixes = 6;
     int32 client_id = 7;
     int64 until_ns = 8;
+    int32 client_epoch = 9;
 }
 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 d4b9d63b1..5ba73c65b 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", 0, *dir, nil, 0, 0, 0, eachEntryFunc, pb.TrivialOnError)
+	tailErr := pb.FollowMetadata(pb.ServerAddress(*tailFiler), grpc.WithInsecure(), "tail", 0, 0, *dir, nil, 0, 0, 0, eachEntryFunc, pb.TrivialOnError)
 
 	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 d191c693b..90bc8c5c3 100644
--- a/weed/command/filer_backup.go
+++ b/weed/command/filer_backup.go
@@ -55,9 +55,11 @@ func runFilerBackup(cmd *Command, args []string) bool {
 	grpcDialOption := security.LoadClientTLS(util.GetViper(), "grpc.client")
 
 	clientId := util.RandomInt32()
+	var clientEpoch int32
 
 	for {
-		err := doFilerBackup(grpcDialOption, &filerBackupOptions, clientId)
+		clientEpoch++
+		err := doFilerBackup(grpcDialOption, &filerBackupOptions, clientId, clientEpoch)
 		if err != nil {
 			glog.Errorf("backup from %s: %v", *filerBackupOptions.filer, err)
 			time.Sleep(1747 * time.Millisecond)
@@ -71,7 +73,7 @@ const (
 	BackupKeyPrefix = "backup."
 )
 
-func doFilerBackup(grpcDialOption grpc.DialOption, backupOption *FilerBackupOptions, clientId int32) error {
+func doFilerBackup(grpcDialOption grpc.DialOption, backupOption *FilerBackupOptions, clientId int32, clientEpoch int32) error {
 
 	// find data sink
 	config := util.GetViper()
@@ -114,6 +116,6 @@ func doFilerBackup(grpcDialOption grpc.DialOption, backupOption *FilerBackupOpti
 		return setOffset(grpcDialOption, sourceFiler, BackupKeyPrefix, int32(sinkId), lastTsNs)
 	})
 
-	return pb.FollowMetadata(sourceFiler, grpcDialOption, "backup_"+dataSink.GetName(), clientId, sourcePath, nil, startFrom.UnixNano(), 0, 0, processEventFnWithOffset, pb.TrivialOnError)
+	return pb.FollowMetadata(sourceFiler, grpcDialOption, "backup_"+dataSink.GetName(), clientId, clientEpoch, sourcePath, nil, startFrom.UnixNano(), 0, 0, processEventFnWithOffset, pb.TrivialOnError)
 
 }
diff --git a/weed/command/filer_meta_backup.go b/weed/command/filer_meta_backup.go
index cf679885d..54cfc31b7 100644
--- a/weed/command/filer_meta_backup.go
+++ b/weed/command/filer_meta_backup.go
@@ -27,8 +27,9 @@ type FilerMetaBackupOptions struct {
 	restart           *bool
 	backupFilerConfig *string
 
-	store    filer.FilerStore
-	clientId int32
+	store       filer.FilerStore
+	clientId    int32
+	clientEpoch int32
 }
 
 func init() {
@@ -194,7 +195,8 @@ func (metaBackup *FilerMetaBackupOptions) streamMetadataBackup() error {
 		return metaBackup.setOffset(lastTime)
 	})
 
-	return pb.FollowMetadata(pb.ServerAddress(*metaBackup.filerAddress), metaBackup.grpcDialOption, "meta_backup", metaBackup.clientId,
+	metaBackup.clientEpoch++
+	return pb.FollowMetadata(pb.ServerAddress(*metaBackup.filerAddress), metaBackup.grpcDialOption, "meta_backup", metaBackup.clientId, metaBackup.clientEpoch,
 		*metaBackup.filerDirectory, nil, startTime.UnixNano(), 0, 0, processEventFnWithOffset, pb.TrivialOnError)
 
 }
diff --git a/weed/command/filer_meta_tail.go b/weed/command/filer_meta_tail.go
index 66a87c3d9..e319e93e6 100644
--- a/weed/command/filer_meta_tail.go
+++ b/weed/command/filer_meta_tail.go
@@ -110,7 +110,7 @@ func runFilerMetaTail(cmd *Command, args []string) bool {
 		untilTsNs = time.Now().Add(-*tailStop).UnixNano()
 	}
 
-	tailErr := pb.FollowMetadata(pb.ServerAddress(*tailFiler), grpcDialOption, "tail", clientId, *tailTarget, nil,
+	tailErr := pb.FollowMetadata(pb.ServerAddress(*tailFiler), grpcDialOption, "tail", clientId, 0, *tailTarget, nil,
 		time.Now().Add(-*tailStart).UnixNano(), untilTsNs, 0, func(resp *filer_pb.SubscribeMetadataResponse) error {
 			if !shouldPrint(resp) {
 				return nil
diff --git a/weed/command/filer_remote_gateway.go b/weed/command/filer_remote_gateway.go
index 33454f378..9389ff79b 100644
--- a/weed/command/filer_remote_gateway.go
+++ b/weed/command/filer_remote_gateway.go
@@ -29,6 +29,7 @@ type RemoteGatewayOptions struct {
 	remoteConfs map[string]*remote_pb.RemoteConf
 	bucketsDir  string
 	clientId    int32
+	clientEpoch int32
 }
 
 var _ = filer_pb.FilerClient(&RemoteGatewayOptions{})
diff --git a/weed/command/filer_remote_gateway_buckets.go b/weed/command/filer_remote_gateway_buckets.go
index 9fe0e29df..121f46114 100644
--- a/weed/command/filer_remote_gateway_buckets.go
+++ b/weed/command/filer_remote_gateway_buckets.go
@@ -39,7 +39,8 @@ 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", option.clientId,
+	option.clientEpoch++
+	return pb.FollowMetadata(pb.ServerAddress(*option.filerAddress), option.grpcDialOption, "filer.remote.sync", option.clientId, option.clientEpoch,
 		option.bucketsDir, []string{filer.DirectoryEtcRemote}, lastOffsetTs.UnixNano(), 0, 0, processEventFnWithOffset, pb.TrivialOnError)
 }
 
diff --git a/weed/command/filer_remote_sync.go b/weed/command/filer_remote_sync.go
index d6ccf7b79..49334f13d 100644
--- a/weed/command/filer_remote_sync.go
+++ b/weed/command/filer_remote_sync.go
@@ -19,6 +19,7 @@ type RemoteSyncOptions struct {
 	timeAgo            *time.Duration
 	dir                *string
 	clientId           int32
+	clientEpoch        int32
 }
 
 var _ = filer_pb.FilerClient(&RemoteSyncOptions{})
diff --git a/weed/command/filer_remote_sync_dir.go b/weed/command/filer_remote_sync_dir.go
index 5fc20be9a..b54bfcf71 100644
--- a/weed/command/filer_remote_sync_dir.go
+++ b/weed/command/filer_remote_sync_dir.go
@@ -40,7 +40,8 @@ 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", option.clientId,
+	option.clientEpoch++
+	return pb.FollowMetadata(pb.ServerAddress(*option.filerAddress), option.grpcDialOption, "filer.remote.sync", option.clientId, option.clientEpoch,
 		mountedDir, []string{filer.DirectoryEtcRemote}, lastOffsetTs.UnixNano(), 0, 0, processEventFnWithOffset, pb.TrivialOnError)
 }
 
diff --git a/weed/command/filer_sync.go b/weed/command/filer_sync.go
index 1550d155a..130138a3d 100644
--- a/weed/command/filer_sync.go
+++ b/weed/command/filer_sync.go
@@ -43,6 +43,7 @@ type SyncOptions struct {
 	bProxyByFiler   *bool
 	metricsHttpPort *int
 	clientId        int32
+	clientEpoch     int32
 }
 
 var (
@@ -131,7 +132,8 @@ func runFilerSynchronize(cmd *Command, args []string) bool {
 			os.Exit(2)
 		}
 		for {
-			err := doSubscribeFilerMetaChanges(syncOptions.clientId, grpcDialOption, filerA, *syncOptions.aPath, *syncOptions.aProxyByFiler, filerB,
+			syncOptions.clientEpoch++
+			err := doSubscribeFilerMetaChanges(syncOptions.clientId, syncOptions.clientEpoch, grpcDialOption, filerA, *syncOptions.aPath, *syncOptions.aProxyByFiler, filerB,
 				*syncOptions.bPath, *syncOptions.bReplication, *syncOptions.bCollection, *syncOptions.bTtlSec, *syncOptions.bProxyByFiler, *syncOptions.bDiskType,
 				*syncOptions.bDebug, aFilerSignature, bFilerSignature)
 			if err != nil {
@@ -151,7 +153,8 @@ func runFilerSynchronize(cmd *Command, args []string) bool {
 		}
 		go func() {
 			for {
-				err := doSubscribeFilerMetaChanges(syncOptions.clientId, grpcDialOption, filerB, *syncOptions.bPath, *syncOptions.bProxyByFiler, filerA,
+				syncOptions.clientEpoch++
+				err := doSubscribeFilerMetaChanges(syncOptions.clientId, syncOptions.clientEpoch, grpcDialOption, filerB, *syncOptions.bPath, *syncOptions.bProxyByFiler, filerA,
 					*syncOptions.aPath, *syncOptions.aReplication, *syncOptions.aCollection, *syncOptions.aTtlSec, *syncOptions.aProxyByFiler, *syncOptions.aDiskType,
 					*syncOptions.aDebug, bFilerSignature, aFilerSignature)
 				if err != nil {
@@ -183,7 +186,7 @@ func initOffsetFromTsMs(grpcDialOption grpc.DialOption, targetFiler pb.ServerAdd
 	return nil
 }
 
-func doSubscribeFilerMetaChanges(clientId int32, grpcDialOption grpc.DialOption, sourceFiler pb.ServerAddress, sourcePath string, sourceReadChunkFromFiler bool, targetFiler pb.ServerAddress, targetPath string,
+func doSubscribeFilerMetaChanges(clientId int32, clientEpoch 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, sourceFilerSignature int32, targetFilerSignature int32) error {
 
 	// if first time, start from now
@@ -226,7 +229,7 @@ func doSubscribeFilerMetaChanges(clientId int32, grpcDialOption grpc.DialOption,
 		return setOffset(grpcDialOption, targetFiler, getSignaturePrefixByPath(sourcePath), sourceFilerSignature, lastTsNs)
 	})
 
-	return pb.FollowMetadata(sourceFiler, grpcDialOption, clientName, clientId,
+	return pb.FollowMetadata(sourceFiler, grpcDialOption, clientName, clientId, clientEpoch,
 		sourcePath, nil, sourceFilerOffsetTsNs, 0, targetFilerSignature, processEventFnWithOffset, pb.RetryForeverOnError)
 
 }
diff --git a/weed/filer/filer.go b/weed/filer/filer.go
index 15fe69116..e953d014f 100644
--- a/weed/filer/filer.go
+++ b/weed/filer/filer.go
@@ -45,7 +45,8 @@ type Filer struct {
 	Signature           int32
 	FilerConf           *FilerConf
 	RemoteStorage       *FilerRemoteStorage
-	UniqueFileId        uint32
+	UniqueFilerId       int32
+	UniqueFilerEpoch    int32
 }
 
 func NewFiler(masters map[string]pb.ServerAddress, grpcDialOption grpc.DialOption, filerHost pb.ServerAddress,
@@ -56,8 +57,12 @@ func NewFiler(masters map[string]pb.ServerAddress, grpcDialOption grpc.DialOptio
 		GrpcDialOption:      grpcDialOption,
 		FilerConf:           NewFilerConf(),
 		RemoteStorage:       NewFilerRemoteStorage(),
-		UniqueFileId:        uint32(util.RandomInt32()),
+		UniqueFilerId:       util.RandomInt32(),
 	}
+	if f.UniqueFilerId < 0 {
+		f.UniqueFilerId = -f.UniqueFilerId
+	}
+
 	f.LocalMetaLogBuffer = log_buffer.NewLogBuffer("local", LogFlushInterval, f.logFlushFunc, notifyFn)
 	f.metaLogCollection = collection
 	f.metaLogReplication = replication
@@ -79,8 +84,9 @@ func (f *Filer) MaybeBootstrapFromPeers(self pb.ServerAddress, existingNodes []*
 		return
 	}
 
-	glog.V(0).Infof("bootstrap from %v clientId:%d", earliestNode.Address, f.UniqueFileId)
-	err = pb.FollowMetadata(pb.ServerAddress(earliestNode.Address), f.GrpcDialOption, "bootstrap", int32(f.UniqueFileId), "/", nil,
+	glog.V(0).Infof("bootstrap from %v clientId:%d", earliestNode.Address, f.UniqueFilerId)
+	f.UniqueFilerEpoch++
+	err = pb.FollowMetadata(pb.ServerAddress(earliestNode.Address), f.GrpcDialOption, "bootstrap", f.UniqueFilerId, f.UniqueFilerEpoch, "/", nil,
 		0, snapshotTime.UnixNano(), f.Signature, func(resp *filer_pb.SubscribeMetadataResponse) error {
 			return Replay(f.Store, resp)
 		}, pb.FatalOnError)
diff --git a/weed/filer/filer_notify.go b/weed/filer/filer_notify.go
index 4d26a695c..66c77631e 100644
--- a/weed/filer/filer_notify.go
+++ b/weed/filer/filer_notify.go
@@ -94,7 +94,7 @@ func (f *Filer) logFlushFunc(startTime, stopTime time.Time, buf []byte) {
 	startTime, stopTime = startTime.UTC(), stopTime.UTC()
 
 	targetFile := fmt.Sprintf("%s/%04d-%02d-%02d/%02d-%02d.%08x", SystemLogDir,
-		startTime.Year(), startTime.Month(), startTime.Day(), startTime.Hour(), startTime.Minute(), f.UniqueFileId,
+		startTime.Year(), startTime.Month(), startTime.Day(), startTime.Hour(), startTime.Minute(), f.UniqueFilerId,
 		// startTime.Second(), startTime.Nanosecond(),
 	)
 
diff --git a/weed/filer/meta_aggregator.go b/weed/filer/meta_aggregator.go
index 5799e247e..a6c32428d 100644
--- a/weed/filer/meta_aggregator.go
+++ b/weed/filer/meta_aggregator.go
@@ -190,15 +190,17 @@ func (ma *MetaAggregator) doSubscribeToOneFiler(f *Filer, self pb.ServerAddress,
 		return nil
 	}
 
-	glog.V(0).Infof("subscribing remote %s meta change: %v, clientId:%d", peer, time.Unix(0, lastTsNs), ma.filer.UniqueFileId)
+	glog.V(0).Infof("subscribing remote %s meta change: %v, clientId:%d", peer, time.Unix(0, lastTsNs), ma.filer.UniqueFilerId)
 	err = pb.WithFilerClient(true, peer, ma.grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
 		ctx, cancel := context.WithCancel(context.Background())
 		defer cancel()
+		ma.filer.UniqueFilerEpoch++
 		stream, err := client.SubscribeLocalMetadata(ctx, &filer_pb.SubscribeMetadataRequest{
-			ClientName: "filer:" + string(self),
-			PathPrefix: "/",
-			SinceNs:    lastTsNs,
-			ClientId:   int32(ma.filer.UniqueFileId),
+			ClientName:  "filer:" + string(self),
+			PathPrefix:  "/",
+			SinceNs:     lastTsNs,
+			ClientId:    ma.filer.UniqueFilerId,
+			ClientEpoch: ma.filer.UniqueFilerEpoch,
 		})
 		if err != nil {
 			return fmt.Errorf("subscribe: %v", err)
diff --git a/weed/mount/meta_cache/meta_cache_subscribe.go b/weed/mount/meta_cache/meta_cache_subscribe.go
index c8ccdd375..7086cd0a3 100644
--- a/weed/mount/meta_cache/meta_cache_subscribe.go
+++ b/weed/mount/meta_cache/meta_cache_subscribe.go
@@ -57,8 +57,10 @@ func SubscribeMetaEvents(mc *MetaCache, selfSignature int32, client filer_pb.Fil
 
 	}
 
+	var clientEpoch int32
 	util.RetryForever("followMetaUpdates", func() error {
-		return pb.WithFilerClientFollowMetadata(client, "mount", selfSignature, dir, &lastTsNs, 0, selfSignature, processEventFn, pb.FatalOnError)
+		clientEpoch++
+		return pb.WithFilerClientFollowMetadata(client, "mount", selfSignature, clientEpoch, dir, &lastTsNs, 0, selfSignature, processEventFn, pb.FatalOnError)
 	}, 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 bd0932cb8..6277c3c6e 100644
--- a/weed/pb/filer.proto
+++ b/weed/pb/filer.proto
@@ -346,6 +346,7 @@ message SubscribeMetadataRequest {
     repeated string path_prefixes = 6;
     int32 client_id = 7;
     int64 until_ns = 8;
+    int32 client_epoch = 9;
 }
 message SubscribeMetadataResponse {
     string directory = 1;
diff --git a/weed/pb/filer_pb/filer.pb.go b/weed/pb/filer_pb/filer.pb.go
index 4ac560855..6fc2f6d8f 100644
--- a/weed/pb/filer_pb/filer.pb.go
+++ b/weed/pb/filer_pb/filer.pb.go
@@ -2803,6 +2803,7 @@ type SubscribeMetadataRequest struct {
 	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"`
 	UntilNs      int64    `protobuf:"varint,8,opt,name=until_ns,json=untilNs,proto3" json:"until_ns,omitempty"`
+	ClientEpoch  int32    `protobuf:"varint,9,opt,name=client_epoch,json=clientEpoch,proto3" json:"client_epoch,omitempty"`
 }
 
 func (x *SubscribeMetadataRequest) Reset() {
@@ -2886,6 +2887,13 @@ func (x *SubscribeMetadataRequest) GetUntilNs() int64 {
 	return 0
 }
 
+func (x *SubscribeMetadataRequest) GetClientEpoch() int32 {
+	if x != nil {
+		return x.ClientEpoch
+	}
+	return 0
+}
+
 type SubscribeMetadataResponse struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -4147,7 +4155,7 @@ var file_filer_proto_rawDesc = []byte{
 	0x64, 0x18, 0x0c, 0x20, 0x01, 0x28, 0x09, 0x52, 0x09, 0x63, 0x6c, 0x75, 0x73, 0x74, 0x65, 0x72,
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@@ -4162,224 +4170,226 @@ var file_filer_proto_rawDesc = []byte{
 	0x12, 0x1b, 0x0a, 0x09, 0x63, 0x6c, 0x69, 0x65, 0x6e, 0x74, 0x5f, 0x69, 0x64, 0x18, 0x07, 0x20,
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 }
 
 var (
diff --git a/weed/pb/filer_pb_tail.go b/weed/pb/filer_pb_tail.go
index 2d6a7898b..88d1a55e1 100644
--- a/weed/pb/filer_pb_tail.go
+++ b/weed/pb/filer_pb_tail.go
@@ -21,11 +21,12 @@ const (
 
 type ProcessMetadataFunc func(resp *filer_pb.SubscribeMetadataResponse) error
 
-func FollowMetadata(filerAddress ServerAddress, grpcDialOption grpc.DialOption, clientName string, clientId int32,
+func FollowMetadata(filerAddress ServerAddress, grpcDialOption grpc.DialOption, clientName string, clientId int32, clientEpoch int32,
 	pathPrefix string, additionalPathPrefixes []string, lastTsNs int64, untilTsNs int64, selfSignature int32,
 	processEventFn ProcessMetadataFunc, eventErrorType EventErrorType) error {
 
-	err := WithFilerClient(true, filerAddress, grpcDialOption, makeSubscribeMetadataFunc(clientName, clientId,
+	err := WithFilerClient(true, filerAddress, grpcDialOption, makeSubscribeMetadataFunc(
+		clientName, clientId, clientEpoch,
 		pathPrefix, additionalPathPrefixes, &lastTsNs, untilTsNs, selfSignature, processEventFn, eventErrorType))
 	if err != nil {
 		return fmt.Errorf("subscribing filer meta change: %v", err)
@@ -34,11 +35,10 @@ func FollowMetadata(filerAddress ServerAddress, grpcDialOption grpc.DialOption,
 }
 
 func WithFilerClientFollowMetadata(filerClient filer_pb.FilerClient,
-	clientName string, clientId int32, pathPrefix string, lastTsNs *int64, untilTsNs int64, selfSignature int32,
+	clientName string, clientId int32, clientEpoch int32, pathPrefix string, lastTsNs *int64, untilTsNs int64, selfSignature int32,
 	processEventFn ProcessMetadataFunc, eventErrorType EventErrorType) error {
 
-	err := filerClient.WithFilerClient(true, makeSubscribeMetadataFunc(clientName, clientId,
-		pathPrefix, nil, lastTsNs, untilTsNs, selfSignature, processEventFn, eventErrorType))
+	err := filerClient.WithFilerClient(true, makeSubscribeMetadataFunc(clientName, clientId, clientEpoch, pathPrefix, nil, lastTsNs, untilTsNs, selfSignature, processEventFn, eventErrorType))
 	if err != nil {
 		return fmt.Errorf("subscribing filer meta change: %v", err)
 	}
@@ -46,8 +46,7 @@ func WithFilerClientFollowMetadata(filerClient filer_pb.FilerClient,
 	return nil
 }
 
-func makeSubscribeMetadataFunc(clientName string, clientId int32, pathPrefix string, additionalPathPrefixes []string, lastTsNs *int64, untilTsNs int64, selfSignature int32,
-	processEventFn ProcessMetadataFunc, eventErrorType EventErrorType) func(client filer_pb.SeaweedFilerClient) error {
+func makeSubscribeMetadataFunc(clientName string, clientId int32, clientEpoch int32, pathPrefix string, additionalPathPrefixes []string, lastTsNs *int64, untilTsNs int64, selfSignature int32, processEventFn ProcessMetadataFunc, eventErrorType EventErrorType) func(client filer_pb.SeaweedFilerClient) error {
 	return func(client filer_pb.SeaweedFilerClient) error {
 		ctx, cancel := context.WithCancel(context.Background())
 		defer cancel()
@@ -58,6 +57,7 @@ func makeSubscribeMetadataFunc(clientName string, clientId int32, pathPrefix str
 			SinceNs:      *lastTsNs,
 			Signature:    selfSignature,
 			ClientId:     clientId,
+			ClientEpoch:  clientEpoch,
 			UntilNs:      untilTsNs,
 		})
 		if err != nil {
diff --git a/weed/pb/remote_pb/remote.pb.go b/weed/pb/remote_pb/remote.pb.go
index f746333ff..a9514c212 100644
--- a/weed/pb/remote_pb/remote.pb.go
+++ b/weed/pb/remote_pb/remote.pb.go
@@ -28,51 +28,47 @@ type RemoteConf struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Type                            string   `protobuf:"bytes,1,opt,name=type,proto3" json:"type,omitempty"`
-	Name                            string   `protobuf:"bytes,2,opt,name=name,proto3" json:"name,omitempty"`
-	S3AccessKey                     string   `protobuf:"bytes,4,opt,name=s3_access_key,json=s3AccessKey,proto3" json:"s3_access_key,omitempty"`
-	S3SecretKey                     string   `protobuf:"bytes,5,opt,name=s3_secret_key,json=s3SecretKey,proto3" json:"s3_secret_key,omitempty"`
-	S3Region                        string   `protobuf:"bytes,6,opt,name=s3_region,json=s3Region,proto3" json:"s3_region,omitempty"`
-	S3Endpoint                      string   `protobuf:"bytes,7,opt,name=s3_endpoint,json=s3Endpoint,proto3" json:"s3_endpoint,omitempty"`
-	S3StorageClass                  string   `protobuf:"bytes,8,opt,name=s3_storage_class,json=s3StorageClass,proto3" json:"s3_storage_class,omitempty"`
-	S3ForcePathStyle                bool     `protobuf:"varint,9,opt,name=s3_force_path_style,json=s3ForcePathStyle,proto3" json:"s3_force_path_style,omitempty"`
-	S3V4Signature                   bool     `protobuf:"varint,11,opt,name=s3_v4_signature,json=s3V4Signature,proto3" json:"s3_v4_signature,omitempty"`
-	GcsGoogleApplicationCredentials string   `protobuf:"bytes,10,opt,name=gcs_google_application_credentials,json=gcsGoogleApplicationCredentials,proto3" json:"gcs_google_application_credentials,omitempty"`
-	GcsProjectId                    string   `protobuf:"bytes,12,opt,name=gcs_project_id,json=gcsProjectId,proto3" json:"gcs_project_id,omitempty"`
-	AzureAccountName                string   `protobuf:"bytes,15,opt,name=azure_account_name,json=azureAccountName,proto3" json:"azure_account_name,omitempty"`
-	AzureAccountKey                 string   `protobuf:"bytes,16,opt,name=azure_account_key,json=azureAccountKey,proto3" json:"azure_account_key,omitempty"`
-	BackblazeKeyId                  string   `protobuf:"bytes,20,opt,name=backblaze_key_id,json=backblazeKeyId,proto3" json:"backblaze_key_id,omitempty"`
-	BackblazeApplicationKey         string   `protobuf:"bytes,21,opt,name=backblaze_application_key,json=backblazeApplicationKey,proto3" json:"backblaze_application_key,omitempty"`
-	BackblazeEndpoint               string   `protobuf:"bytes,22,opt,name=backblaze_endpoint,json=backblazeEndpoint,proto3" json:"backblaze_endpoint,omitempty"`
-	AliyunAccessKey                 string   `protobuf:"bytes,25,opt,name=aliyun_access_key,json=aliyunAccessKey,proto3" json:"aliyun_access_key,omitempty"`
-	AliyunSecretKey                 string   `protobuf:"bytes,26,opt,name=aliyun_secret_key,json=aliyunSecretKey,proto3" json:"aliyun_secret_key,omitempty"`
-	AliyunEndpoint                  string   `protobuf:"bytes,27,opt,name=aliyun_endpoint,json=aliyunEndpoint,proto3" json:"aliyun_endpoint,omitempty"`
-	AliyunRegion                    string   `protobuf:"bytes,28,opt,name=aliyun_region,json=aliyunRegion,proto3" json:"aliyun_region,omitempty"`
-	TencentSecretId                 string   `protobuf:"bytes,30,opt,name=tencent_secret_id,json=tencentSecretId,proto3" json:"tencent_secret_id,omitempty"`
-	TencentSecretKey                string   `protobuf:"bytes,31,opt,name=tencent_secret_key,json=tencentSecretKey,proto3" json:"tencent_secret_key,omitempty"`
-	TencentEndpoint                 string   `protobuf:"bytes,32,opt,name=tencent_endpoint,json=tencentEndpoint,proto3" json:"tencent_endpoint,omitempty"`
-	BaiduAccessKey                  string   `protobuf:"bytes,35,opt,name=baidu_access_key,json=baiduAccessKey,proto3" json:"baidu_access_key,omitempty"`
-	BaiduSecretKey                  string   `protobuf:"bytes,36,opt,name=baidu_secret_key,json=baiduSecretKey,proto3" json:"baidu_secret_key,omitempty"`
-	BaiduEndpoint                   string   `protobuf:"bytes,37,opt,name=baidu_endpoint,json=baiduEndpoint,proto3" json:"baidu_endpoint,omitempty"`
-	BaiduRegion                     string   `protobuf:"bytes,38,opt,name=baidu_region,json=baiduRegion,proto3" json:"baidu_region,omitempty"`
-	WasabiAccessKey                 string   `protobuf:"bytes,40,opt,name=wasabi_access_key,json=wasabiAccessKey,proto3" json:"wasabi_access_key,omitempty"`
-	WasabiSecretKey                 string   `protobuf:"bytes,41,opt,name=wasabi_secret_key,json=wasabiSecretKey,proto3" json:"wasabi_secret_key,omitempty"`
-	WasabiEndpoint                  string   `protobuf:"bytes,42,opt,name=wasabi_endpoint,json=wasabiEndpoint,proto3" json:"wasabi_endpoint,omitempty"`
-	WasabiRegion                    string   `protobuf:"bytes,43,opt,name=wasabi_region,json=wasabiRegion,proto3" json:"wasabi_region,omitempty"`
-	HdfsNamenodes                   []string `protobuf:"bytes,50,rep,name=hdfs_namenodes,json=hdfsNamenodes,proto3" json:"hdfs_namenodes,omitempty"`
-	HdfsUsername                    string   `protobuf:"bytes,51,opt,name=hdfs_username,json=hdfsUsername,proto3" json:"hdfs_username,omitempty"`
-	HdfsServicePrincipalName        string   `protobuf:"bytes,52,opt,name=hdfs_service_principal_name,json=hdfsServicePrincipalName,proto3" json:"hdfs_service_principal_name,omitempty"`
-	HdfsDataTransferProtection      string   `protobuf:"bytes,53,opt,name=hdfs_data_transfer_protection,json=hdfsDataTransferProtection,proto3" json:"hdfs_data_transfer_protection,omitempty"`
-	FilebaseAccessKey               string   `protobuf:"bytes,60,opt,name=filebase_access_key,json=filebaseAccessKey,proto3" json:"filebase_access_key,omitempty"`
-	FilebaseSecretKey               string   `protobuf:"bytes,61,opt,name=filebase_secret_key,json=filebaseSecretKey,proto3" json:"filebase_secret_key,omitempty"`
-	FilebaseEndpoint                string   `protobuf:"bytes,62,opt,name=filebase_endpoint,json=filebaseEndpoint,proto3" json:"filebase_endpoint,omitempty"`
-	StorjAccessKey                  string   `protobuf:"bytes,65,opt,name=storj_access_key,json=storjAccessKey,proto3" json:"storj_access_key,omitempty"`
-	StorjSecretKey                  string   `protobuf:"bytes,66,opt,name=storj_secret_key,json=storjSecretKey,proto3" json:"storj_secret_key,omitempty"`
-	StorjEndpoint                   string   `protobuf:"bytes,67,opt,name=storj_endpoint,json=storjEndpoint,proto3" json:"storj_endpoint,omitempty"`
-	ContaboAccessKey                string   `protobuf:"bytes,68,opt,name=contabo_access_key,json=contaboAccessKey,proto3" json:"contabo_access_key,omitempty"`
-	ContaboSecretKey                string   `protobuf:"bytes,69,opt,name=contabo_secret_key,json=contaboSecretKey,proto3" json:"contabo_secret_key,omitempty"`
-	ContaboEndpoint                 string   `protobuf:"bytes,70,opt,name=contabo_endpoint,json=contaboEndpoint,proto3" json:"contabo_endpoint,omitempty"`
-	ContaboRegion                   string   `protobuf:"bytes,71,opt,name=contabo_region,json=contaboRegion,proto3" json:"contabo_region,omitempty"`
+	Type                            string `protobuf:"bytes,1,opt,name=type,proto3" json:"type,omitempty"`
+	Name                            string `protobuf:"bytes,2,opt,name=name,proto3" json:"name,omitempty"`
+	S3AccessKey                     string `protobuf:"bytes,4,opt,name=s3_access_key,json=s3AccessKey,proto3" json:"s3_access_key,omitempty"`
+	S3SecretKey                     string `protobuf:"bytes,5,opt,name=s3_secret_key,json=s3SecretKey,proto3" json:"s3_secret_key,omitempty"`
+	S3Region                        string `protobuf:"bytes,6,opt,name=s3_region,json=s3Region,proto3" json:"s3_region,omitempty"`
+	S3Endpoint                      string `protobuf:"bytes,7,opt,name=s3_endpoint,json=s3Endpoint,proto3" json:"s3_endpoint,omitempty"`
+	S3StorageClass                  string `protobuf:"bytes,8,opt,name=s3_storage_class,json=s3StorageClass,proto3" json:"s3_storage_class,omitempty"`
+	S3ForcePathStyle                bool   `protobuf:"varint,9,opt,name=s3_force_path_style,json=s3ForcePathStyle,proto3" json:"s3_force_path_style,omitempty"`
+	S3V4Signature                   bool   `protobuf:"varint,11,opt,name=s3_v4_signature,json=s3V4Signature,proto3" json:"s3_v4_signature,omitempty"`
+	GcsGoogleApplicationCredentials string `protobuf:"bytes,10,opt,name=gcs_google_application_credentials,json=gcsGoogleApplicationCredentials,proto3" json:"gcs_google_application_credentials,omitempty"`
+	GcsProjectId                    string `protobuf:"bytes,12,opt,name=gcs_project_id,json=gcsProjectId,proto3" json:"gcs_project_id,omitempty"`
+	AzureAccountName                string `protobuf:"bytes,15,opt,name=azure_account_name,json=azureAccountName,proto3" json:"azure_account_name,omitempty"`
+	AzureAccountKey                 string `protobuf:"bytes,16,opt,name=azure_account_key,json=azureAccountKey,proto3" json:"azure_account_key,omitempty"`
+	BackblazeKeyId                  string `protobuf:"bytes,20,opt,name=backblaze_key_id,json=backblazeKeyId,proto3" json:"backblaze_key_id,omitempty"`
+	BackblazeApplicationKey         string `protobuf:"bytes,21,opt,name=backblaze_application_key,json=backblazeApplicationKey,proto3" json:"backblaze_application_key,omitempty"`
+	BackblazeEndpoint               string `protobuf:"bytes,22,opt,name=backblaze_endpoint,json=backblazeEndpoint,proto3" json:"backblaze_endpoint,omitempty"`
+	AliyunAccessKey                 string `protobuf:"bytes,25,opt,name=aliyun_access_key,json=aliyunAccessKey,proto3" json:"aliyun_access_key,omitempty"`
+	AliyunSecretKey                 string `protobuf:"bytes,26,opt,name=aliyun_secret_key,json=aliyunSecretKey,proto3" json:"aliyun_secret_key,omitempty"`
+	AliyunEndpoint                  string `protobuf:"bytes,27,opt,name=aliyun_endpoint,json=aliyunEndpoint,proto3" json:"aliyun_endpoint,omitempty"`
+	AliyunRegion                    string `protobuf:"bytes,28,opt,name=aliyun_region,json=aliyunRegion,proto3" json:"aliyun_region,omitempty"`
+	TencentSecretId                 string `protobuf:"bytes,30,opt,name=tencent_secret_id,json=tencentSecretId,proto3" json:"tencent_secret_id,omitempty"`
+	TencentSecretKey                string `protobuf:"bytes,31,opt,name=tencent_secret_key,json=tencentSecretKey,proto3" json:"tencent_secret_key,omitempty"`
+	TencentEndpoint                 string `protobuf:"bytes,32,opt,name=tencent_endpoint,json=tencentEndpoint,proto3" json:"tencent_endpoint,omitempty"`
+	BaiduAccessKey                  string `protobuf:"bytes,35,opt,name=baidu_access_key,json=baiduAccessKey,proto3" json:"baidu_access_key,omitempty"`
+	BaiduSecretKey                  string `protobuf:"bytes,36,opt,name=baidu_secret_key,json=baiduSecretKey,proto3" json:"baidu_secret_key,omitempty"`
+	BaiduEndpoint                   string `protobuf:"bytes,37,opt,name=baidu_endpoint,json=baiduEndpoint,proto3" json:"baidu_endpoint,omitempty"`
+	BaiduRegion                     string `protobuf:"bytes,38,opt,name=baidu_region,json=baiduRegion,proto3" json:"baidu_region,omitempty"`
+	WasabiAccessKey                 string `protobuf:"bytes,40,opt,name=wasabi_access_key,json=wasabiAccessKey,proto3" json:"wasabi_access_key,omitempty"`
+	WasabiSecretKey                 string `protobuf:"bytes,41,opt,name=wasabi_secret_key,json=wasabiSecretKey,proto3" json:"wasabi_secret_key,omitempty"`
+	WasabiEndpoint                  string `protobuf:"bytes,42,opt,name=wasabi_endpoint,json=wasabiEndpoint,proto3" json:"wasabi_endpoint,omitempty"`
+	WasabiRegion                    string `protobuf:"bytes,43,opt,name=wasabi_region,json=wasabiRegion,proto3" json:"wasabi_region,omitempty"`
+	FilebaseAccessKey               string `protobuf:"bytes,60,opt,name=filebase_access_key,json=filebaseAccessKey,proto3" json:"filebase_access_key,omitempty"`
+	FilebaseSecretKey               string `protobuf:"bytes,61,opt,name=filebase_secret_key,json=filebaseSecretKey,proto3" json:"filebase_secret_key,omitempty"`
+	FilebaseEndpoint                string `protobuf:"bytes,62,opt,name=filebase_endpoint,json=filebaseEndpoint,proto3" json:"filebase_endpoint,omitempty"`
+	StorjAccessKey                  string `protobuf:"bytes,65,opt,name=storj_access_key,json=storjAccessKey,proto3" json:"storj_access_key,omitempty"`
+	StorjSecretKey                  string `protobuf:"bytes,66,opt,name=storj_secret_key,json=storjSecretKey,proto3" json:"storj_secret_key,omitempty"`
+	StorjEndpoint                   string `protobuf:"bytes,67,opt,name=storj_endpoint,json=storjEndpoint,proto3" json:"storj_endpoint,omitempty"`
+	ContaboAccessKey                string `protobuf:"bytes,68,opt,name=contabo_access_key,json=contaboAccessKey,proto3" json:"contabo_access_key,omitempty"`
+	ContaboSecretKey                string `protobuf:"bytes,69,opt,name=contabo_secret_key,json=contaboSecretKey,proto3" json:"contabo_secret_key,omitempty"`
+	ContaboEndpoint                 string `protobuf:"bytes,70,opt,name=contabo_endpoint,json=contaboEndpoint,proto3" json:"contabo_endpoint,omitempty"`
+	ContaboRegion                   string `protobuf:"bytes,71,opt,name=contabo_region,json=contaboRegion,proto3" json:"contabo_region,omitempty"`
 }
 
 func (x *RemoteConf) Reset() {
@@ -324,34 +320,6 @@ func (x *RemoteConf) GetWasabiRegion() string {
 	return ""
 }
 
-func (x *RemoteConf) GetHdfsNamenodes() []string {
-	if x != nil {
-		return x.HdfsNamenodes
-	}
-	return nil
-}
-
-func (x *RemoteConf) GetHdfsUsername() string {
-	if x != nil {
-		return x.HdfsUsername
-	}
-	return ""
-}
-
-func (x *RemoteConf) GetHdfsServicePrincipalName() string {
-	if x != nil {
-		return x.HdfsServicePrincipalName
-	}
-	return ""
-}
-
-func (x *RemoteConf) GetHdfsDataTransferProtection() string {
-	if x != nil {
-		return x.HdfsDataTransferProtection
-	}
-	return ""
-}
-
 func (x *RemoteConf) GetFilebaseAccessKey() string {
 	if x != nil {
 		return x.FilebaseAccessKey
@@ -544,7 +512,7 @@ var File_remote_proto protoreflect.FileDescriptor
 
 var file_remote_proto_rawDesc = []byte{
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+	0x74, 0x6f, 0x33,
 }
 
 var (
diff --git a/weed/s3api/auth_credentials_subscribe.go b/weed/s3api/auth_credentials_subscribe.go
index f2bd94f56..55e63326d 100644
--- a/weed/s3api/auth_credentials_subscribe.go
+++ b/weed/s3api/auth_credentials_subscribe.go
@@ -32,8 +32,10 @@ func (s3a *S3ApiServer) subscribeMetaEvents(clientName string, prefix string, la
 		return nil
 	}
 
+	var clientEpoch int32
 	util.RetryForever("followIamChanges", func() error {
-		return pb.WithFilerClientFollowMetadata(s3a, clientName, s3a.randomClientId, prefix, &lastTsNs, 0, 0, processEventFn, pb.FatalOnError)
+		clientEpoch++
+		return pb.WithFilerClientFollowMetadata(s3a, clientName, s3a.randomClientId, clientEpoch, prefix, &lastTsNs, 0, 0, processEventFn, pb.FatalOnError)
 	}, func(err error) bool {
 		glog.V(0).Infof("iam follow metadata changes: %v", err)
 		return true
diff --git a/weed/server/filer_grpc_server_sub_meta.go b/weed/server/filer_grpc_server_sub_meta.go
index 82261ca51..8d6dd987f 100644
--- a/weed/server/filer_grpc_server_sub_meta.go
+++ b/weed/server/filer_grpc_server_sub_meta.go
@@ -24,11 +24,11 @@ func (fs *FilerServer) SubscribeMetadata(req *filer_pb.SubscribeMetadataRequest,
 
 	peerAddress := findClientAddress(stream.Context(), 0)
 
-	alreadyKnown, clientName := fs.addClient(req.ClientName, peerAddress, req.ClientId)
+	alreadyKnown, clientName := fs.addClient(req.ClientName, peerAddress, req.ClientId, req.ClientEpoch)
 	if alreadyKnown {
 		return fmt.Errorf("duplicated subscription detected for client %s id %d", clientName, req.ClientId)
 	}
-	defer fs.deleteClient(clientName, req.ClientId)
+	defer fs.deleteClient(clientName, req.ClientId, req.ClientEpoch)
 
 	lastReadTime := time.Unix(0, req.SinceNs)
 	glog.V(0).Infof(" %v starts to subscribe %s from %+v", clientName, req.PathPrefix, lastReadTime)
@@ -93,13 +93,13 @@ func (fs *FilerServer) SubscribeLocalMetadata(req *filer_pb.SubscribeMetadataReq
 	// use negative client id to differentiate from addClient()/deleteClient() used in SubscribeMetadata()
 	req.ClientId = -req.ClientId
 
-	alreadyKnown, clientName := fs.addClient(req.ClientName, peerAddress, req.ClientId)
+	alreadyKnown, clientName := fs.addClient(req.ClientName, peerAddress, req.ClientId, req.ClientEpoch)
 	if alreadyKnown {
 		return fmt.Errorf("duplicated local subscription detected for client %s clientId:%d", clientName, req.ClientId)
 	}
 	defer func() {
 		glog.V(0).Infof(" - %v local subscribe %s clientId:%d", clientName, req.PathPrefix, req.ClientId)
-		fs.deleteClient(clientName, req.ClientId)
+		fs.deleteClient(clientName, req.ClientId, req.ClientEpoch)
 	}()
 
 	lastReadTime := time.Unix(0, req.SinceNs)
@@ -263,25 +263,30 @@ func hasPrefixIn(text string, prefixes []string) bool {
 	return false
 }
 
-func (fs *FilerServer) addClient(clientType string, clientAddress string, clientId int32) (alreadyKnown bool, clientName string) {
+func (fs *FilerServer) addClient(clientType string, clientAddress string, clientId int32, clientEpoch 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]
-		if !alreadyKnown {
-			fs.knownListeners[clientId] = struct{}{}
+		defer fs.knownListenersLock.Unlock()
+		epoch, found := fs.knownListeners[clientId]
+		if !found || epoch < clientEpoch {
+			fs.knownListeners[clientId] = clientEpoch
+		} else {
+			alreadyKnown = true
 		}
-		fs.knownListenersLock.Unlock()
 	}
 	return
 }
 
-func (fs *FilerServer) deleteClient(clientName string, clientId int32) {
+func (fs *FilerServer) deleteClient(clientName string, clientId int32, clientEpoch int32) {
 	glog.V(0).Infof("- listener %v", clientName)
 	if clientId != 0 {
 		fs.knownListenersLock.Lock()
-		delete(fs.knownListeners, clientId)
-		fs.knownListenersLock.Unlock()
+		defer fs.knownListenersLock.Unlock()
+		epoch, found := fs.knownListeners[clientId]
+		if found && epoch <= clientEpoch {
+			delete(fs.knownListeners, clientId)
+		}
 	}
 }
diff --git a/weed/server/filer_server.go b/weed/server/filer_server.go
index 6bf0261ee..6ccb33996 100644
--- a/weed/server/filer_server.go
+++ b/weed/server/filer_server.go
@@ -88,7 +88,7 @@ type FilerServer struct {
 
 	// track known metadata listeners
 	knownListenersLock sync.Mutex
-	knownListeners     map[int32]struct{}
+	knownListeners     map[int32]int32
 
 	brokers     map[string]map[string]bool
 	brokersLock sync.Mutex
@@ -111,7 +111,7 @@ func NewFilerServer(defaultMux, readonlyMux *http.ServeMux, option *FilerOption)
 	fs = &FilerServer{
 		option:                option,
 		grpcDialOption:        security.LoadClientTLS(util.GetViper(), "grpc.filer"),
-		knownListeners:        make(map[int32]struct{}),
+		knownListeners:        make(map[int32]int32),
 		brokers:               make(map[string]map[string]bool),
 		inFlightDataLimitCond: sync.NewCond(new(sync.Mutex)),
 	}