dedup local metadata subscribers

fix https://github.com/chrislusf/seaweedfs/discussions/2542

weed/filer/meta_aggregator.go

@@ -165,13 +165,14 @@ func (ma *MetaAggregator) subscribeToOneFiler(f *Filer, self pb.ServerAddress, p
 
 	for {
 		glog.V(4).Infof("subscribing remote %s meta change: %v", peer, time.Unix(0, lastTsNs))
-		err := pb.WithFilerClient(false, peer, ma.grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
+		err := pb.WithFilerClient(true, peer, ma.grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
 			ctx, cancel := context.WithCancel(context.Background())
 			defer cancel()
 			stream, err := client.SubscribeLocalMetadata(ctx, &filer_pb.SubscribeMetadataRequest{
 				ClientName: "filer:" + string(self),
 				PathPrefix: "/",
 				SinceNs:    lastTsNs,
+				ClientId:   int32(ma.filer.UniqueFileId),
 			})
 			if err != nil {
 				return fmt.Errorf("subscribe: %v", err)

weed/server/filer_grpc_server_sub_meta.go

@@ -27,7 +27,6 @@ func (fs *FilerServer) SubscribeMetadata(req *filer_pb.SubscribeMetadataRequest,
 	if alreadyKnown {
 		return fmt.Errorf("duplicated subscription detected for client %s id %d", clientName, req.ClientId)
 	}
-
 	defer fs.deleteClient(clientName, req.ClientId)
 
 	lastReadTime := time.Unix(0, req.SinceNs)
@@ -84,9 +83,11 @@ func (fs *FilerServer) SubscribeLocalMetadata(req *filer_pb.SubscribeMetadataReq
 
 	peerAddress := findClientAddress(stream.Context(), 0)
 
-	_, clientName := fs.addClient(req.ClientName, peerAddress, 0)
-
-	defer fs.deleteClient(clientName, 0)
+	alreadyKnown, clientName := fs.addClient(req.ClientName, peerAddress, req.ClientId)
+	if alreadyKnown {
+		return fmt.Errorf("duplicated local subscription detected for client %s id %d", clientName, req.ClientId)
+	}
+	defer fs.deleteClient(clientName, req.ClientId)
 
 	lastReadTime := time.Unix(0, req.SinceNs)
 	glog.V(0).Infof(" %v local subscribe %s from %+v", clientName, req.PathPrefix, lastReadTime)