diff --git a/weed/filer/meta_aggregator.go b/weed/filer/meta_aggregator.go
index beade3201..c672ce342 100644
--- a/weed/filer/meta_aggregator.go
+++ b/weed/filer/meta_aggregator.go
@@ -185,7 +185,7 @@ func (ma *MetaAggregator) doSubscribeToOneFiler(f *Filer, self pb.ServerAddress,
 		return nil
 	}
 
-	glog.V(4).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.UniqueFileId)
 	err = pb.WithFilerClient(true, peer, ma.grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
 		ctx, cancel := context.WithCancel(context.Background())
 		defer cancel()
diff --git a/weed/filer/reader_cache.go b/weed/filer/reader_cache.go
index 4c92f71c8..4f375e764 100644
--- a/weed/filer/reader_cache.go
+++ b/weed/filer/reader_cache.go
@@ -76,7 +76,9 @@ func (rc *ReaderCache) ReadChunkAt(buffer []byte, fileId string, cipherKey []byt
 	rc.Lock()
 	defer rc.Unlock()
 	if cacher, found := rc.downloaders[fileId]; found {
-		return cacher.readChunkAt(buffer, offset)
+		if n, err := cacher.readChunkAt(buffer, offset); n != 0 && err == nil {
+			return n, err
+		}
 	}
 	if shouldCache || rc.lookupFileIdFn == nil {
 		n, err := rc.chunkCache.ReadChunkAt(buffer, fileId, uint64(offset))
@@ -176,6 +178,9 @@ func (s *SingleChunkCacher) startCaching() {
 }
 
 func (s *SingleChunkCacher) destroy() {
+	s.Lock()
+	defer s.Unlock()
+
 	if s.data != nil {
 		mem.Free(s.data)
 		s.data = nil
@@ -194,6 +199,10 @@ func (s *SingleChunkCacher) readChunkAt(buf []byte, offset int64) (int, error) {
 		return 0, s.err
 	}
 
+	if len(s.data) == 0 {
+		return 0, nil
+	}
+
 	return copy(buf, s.data[offset:]), nil
 
 }
diff --git a/weed/s3api/s3api_object_handlers.go b/weed/s3api/s3api_object_handlers.go
index 4ad3454ba..e49d613c4 100644
--- a/weed/s3api/s3api_object_handlers.go
+++ b/weed/s3api/s3api_object_handlers.go
@@ -445,9 +445,9 @@ func (s3a *S3ApiServer) putToFiler(r *http.Request, uploadUrl string, dataReader
 func setEtag(w http.ResponseWriter, etag string) {
 	if etag != "" {
 		if strings.HasPrefix(etag, "\"") {
-			w.Header().Set("ETag", etag)
+			w.Header()["ETag"] = []string{etag}
 		} else {
-			w.Header().Set("ETag", "\""+etag+"\"")
+			w.Header()["ETag"] = []string{"\"" + etag + "\""}
 		}
 	}
 }
diff --git a/weed/server/filer_grpc_server_sub_meta.go b/weed/server/filer_grpc_server_sub_meta.go
index 6a4a5bb17..82261ca51 100644
--- a/weed/server/filer_grpc_server_sub_meta.go
+++ b/weed/server/filer_grpc_server_sub_meta.go
@@ -95,12 +95,15 @@ func (fs *FilerServer) SubscribeLocalMetadata(req *filer_pb.SubscribeMetadataReq
 
 	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)
+		return fmt.Errorf("duplicated local subscription detected for client %s clientId:%d", clientName, req.ClientId)
 	}
-	defer fs.deleteClient(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)
+	}()
 
 	lastReadTime := time.Unix(0, req.SinceNs)
-	glog.V(0).Infof(" %v local subscribe %s from %+v", clientName, req.PathPrefix, lastReadTime)
+	glog.V(0).Infof(" + %v local subscribe %s from %+v clientId:%d", clientName, req.PathPrefix, lastReadTime, req.ClientId)
 
 	eachEventNotificationFn := fs.eachEventNotificationFn(req, stream, clientName)