diff --git a/weed/operation/sync_volume.go b/weed/operation/sync_volume.go
index 662184656..ac2e2bf79 100644
--- a/weed/operation/sync_volume.go
+++ b/weed/operation/sync_volume.go
@@ -2,6 +2,8 @@ package operation
 
 import (
 	"context"
+	"fmt"
+	"io"
 
 	"github.com/chrislusf/seaweedfs/weed/pb/volume_server_pb"
 	. "github.com/chrislusf/seaweedfs/weed/storage/types"
@@ -23,17 +25,30 @@ func GetVolumeSyncStatus(server string, vid uint32) (resp *volume_server_pb.Volu
 func GetVolumeIdxEntries(server string, vid uint32, eachEntryFn func(key NeedleId, offset Offset, size uint32)) error {
 
 	return WithVolumeServerClient(server, func(client volume_server_pb.VolumeServerClient) error {
-		resp, err := client.VolumeSyncIndex(context.Background(), &volume_server_pb.VolumeSyncIndexRequest{
+		stream, err := client.VolumeSyncIndex(context.Background(), &volume_server_pb.VolumeSyncIndexRequest{
 			VolumdId: vid,
 		})
 		if err != nil {
 			return err
 		}
 
-		dataSize := len(resp.IndexFileContent)
+		var indexFileContent []byte
+
+		for {
+			resp, err := stream.Recv()
+			if err == io.EOF {
+				break
+			}
+			if err != nil {
+				return fmt.Errorf("read index entries: %v", err)
+			}
+			indexFileContent = append(indexFileContent, resp.IndexFileContent...)
+		}
+
+		dataSize := len(indexFileContent)
 
 		for idx := 0; idx+NeedleEntrySize <= dataSize; idx += NeedleEntrySize {
-			line := resp.IndexFileContent[idx : idx+NeedleEntrySize]
+			line := indexFileContent[idx : idx+NeedleEntrySize]
 			key := BytesToNeedleId(line[:NeedleIdSize])
 			offset := BytesToOffset(line[NeedleIdSize : NeedleIdSize+OffsetSize])
 			size := util.BytesToUint32(line[NeedleIdSize+OffsetSize : NeedleIdSize+OffsetSize+SizeSize])
diff --git a/weed/pb/volume_server.proto b/weed/pb/volume_server.proto
index ded7f2aa3..8e570f4eb 100644
--- a/weed/pb/volume_server.proto
+++ b/weed/pb/volume_server.proto
@@ -24,9 +24,9 @@ service VolumeServer {
 
     rpc VolumeSyncStatus (VolumeSyncStatusRequest) returns (VolumeSyncStatusResponse) {
     }
-    rpc VolumeSyncIndex (VolumeSyncIndexRequest) returns (VolumeSyncIndexResponse) {
+    rpc VolumeSyncIndex (VolumeSyncIndexRequest) returns (stream VolumeSyncIndexResponse) {
     }
-    rpc VolumeSyncData (VolumeSyncDataRequest) returns (VolumeSyncDataResponse) {
+    rpc VolumeSyncData (VolumeSyncDataRequest) returns (stream VolumeSyncDataResponse) {
     }
 
     rpc VolumeMount (VolumeMountRequest) returns (VolumeMountResponse) {
@@ -104,6 +104,7 @@ message VolumeSyncStatusRequest {
 }
 message VolumeSyncStatusResponse {
     uint32 volumd_id = 1;
+    string collection = 2;
     string replication = 4;
     string ttl = 5;
     uint64 tail_offset = 6;
diff --git a/weed/pb/volume_server_pb/volume_server.pb.go b/weed/pb/volume_server_pb/volume_server.pb.go
index d291d5ff7..58964766d 100644
--- a/weed/pb/volume_server_pb/volume_server.pb.go
+++ b/weed/pb/volume_server_pb/volume_server.pb.go
@@ -352,6 +352,7 @@ func (m *VolumeSyncStatusRequest) GetVolumdId() uint32 {
 
 type VolumeSyncStatusResponse struct {
 	VolumdId        uint32 `protobuf:"varint,1,opt,name=volumd_id,json=volumdId" json:"volumd_id,omitempty"`
+	Collection      string `protobuf:"bytes,2,opt,name=collection" json:"collection,omitempty"`
 	Replication     string `protobuf:"bytes,4,opt,name=replication" json:"replication,omitempty"`
 	Ttl             string `protobuf:"bytes,5,opt,name=ttl" json:"ttl,omitempty"`
 	TailOffset      uint64 `protobuf:"varint,6,opt,name=tail_offset,json=tailOffset" json:"tail_offset,omitempty"`
@@ -371,6 +372,13 @@ func (m *VolumeSyncStatusResponse) GetVolumdId() uint32 {
 	return 0
 }
 
+func (m *VolumeSyncStatusResponse) GetCollection() string {
+	if m != nil {
+		return m.Collection
+	}
+	return ""
+}
+
 func (m *VolumeSyncStatusResponse) GetReplication() string {
 	if m != nil {
 		return m.Replication
@@ -723,8 +731,8 @@ type VolumeServerClient interface {
 	DeleteCollection(ctx context.Context, in *DeleteCollectionRequest, opts ...grpc.CallOption) (*DeleteCollectionResponse, error)
 	AssignVolume(ctx context.Context, in *AssignVolumeRequest, opts ...grpc.CallOption) (*AssignVolumeResponse, error)
 	VolumeSyncStatus(ctx context.Context, in *VolumeSyncStatusRequest, opts ...grpc.CallOption) (*VolumeSyncStatusResponse, error)
-	VolumeSyncIndex(ctx context.Context, in *VolumeSyncIndexRequest, opts ...grpc.CallOption) (*VolumeSyncIndexResponse, error)
-	VolumeSyncData(ctx context.Context, in *VolumeSyncDataRequest, opts ...grpc.CallOption) (*VolumeSyncDataResponse, error)
+	VolumeSyncIndex(ctx context.Context, in *VolumeSyncIndexRequest, opts ...grpc.CallOption) (VolumeServer_VolumeSyncIndexClient, error)
+	VolumeSyncData(ctx context.Context, in *VolumeSyncDataRequest, opts ...grpc.CallOption) (VolumeServer_VolumeSyncDataClient, error)
 	VolumeMount(ctx context.Context, in *VolumeMountRequest, opts ...grpc.CallOption) (*VolumeMountResponse, error)
 	VolumeUnmount(ctx context.Context, in *VolumeUnmountRequest, opts ...grpc.CallOption) (*VolumeUnmountResponse, error)
 }
@@ -809,22 +817,68 @@ func (c *volumeServerClient) VolumeSyncStatus(ctx context.Context, in *VolumeSyn
 	return out, nil
 }
 
-func (c *volumeServerClient) VolumeSyncIndex(ctx context.Context, in *VolumeSyncIndexRequest, opts ...grpc.CallOption) (*VolumeSyncIndexResponse, error) {
-	out := new(VolumeSyncIndexResponse)
-	err := grpc.Invoke(ctx, "/volume_server_pb.VolumeServer/VolumeSyncIndex", in, out, c.cc, opts...)
+func (c *volumeServerClient) VolumeSyncIndex(ctx context.Context, in *VolumeSyncIndexRequest, opts ...grpc.CallOption) (VolumeServer_VolumeSyncIndexClient, error) {
+	stream, err := grpc.NewClientStream(ctx, &_VolumeServer_serviceDesc.Streams[0], c.cc, "/volume_server_pb.VolumeServer/VolumeSyncIndex", opts...)
 	if err != nil {
 		return nil, err
 	}
-	return out, nil
+	x := &volumeServerVolumeSyncIndexClient{stream}
+	if err := x.ClientStream.SendMsg(in); err != nil {
+		return nil, err
+	}
+	if err := x.ClientStream.CloseSend(); err != nil {
+		return nil, err
+	}
+	return x, nil
+}
+
+type VolumeServer_VolumeSyncIndexClient interface {
+	Recv() (*VolumeSyncIndexResponse, error)
+	grpc.ClientStream
+}
+
+type volumeServerVolumeSyncIndexClient struct {
+	grpc.ClientStream
+}
+
+func (x *volumeServerVolumeSyncIndexClient) Recv() (*VolumeSyncIndexResponse, error) {
+	m := new(VolumeSyncIndexResponse)
+	if err := x.ClientStream.RecvMsg(m); err != nil {
+		return nil, err
+	}
+	return m, nil
 }
 
-func (c *volumeServerClient) VolumeSyncData(ctx context.Context, in *VolumeSyncDataRequest, opts ...grpc.CallOption) (*VolumeSyncDataResponse, error) {
-	out := new(VolumeSyncDataResponse)
-	err := grpc.Invoke(ctx, "/volume_server_pb.VolumeServer/VolumeSyncData", in, out, c.cc, opts...)
+func (c *volumeServerClient) VolumeSyncData(ctx context.Context, in *VolumeSyncDataRequest, opts ...grpc.CallOption) (VolumeServer_VolumeSyncDataClient, error) {
+	stream, err := grpc.NewClientStream(ctx, &_VolumeServer_serviceDesc.Streams[1], c.cc, "/volume_server_pb.VolumeServer/VolumeSyncData", opts...)
 	if err != nil {
 		return nil, err
 	}
-	return out, nil
+	x := &volumeServerVolumeSyncDataClient{stream}
+	if err := x.ClientStream.SendMsg(in); err != nil {
+		return nil, err
+	}
+	if err := x.ClientStream.CloseSend(); err != nil {
+		return nil, err
+	}
+	return x, nil
+}
+
+type VolumeServer_VolumeSyncDataClient interface {
+	Recv() (*VolumeSyncDataResponse, error)
+	grpc.ClientStream
+}
+
+type volumeServerVolumeSyncDataClient struct {
+	grpc.ClientStream
+}
+
+func (x *volumeServerVolumeSyncDataClient) Recv() (*VolumeSyncDataResponse, error) {
+	m := new(VolumeSyncDataResponse)
+	if err := x.ClientStream.RecvMsg(m); err != nil {
+		return nil, err
+	}
+	return m, nil
 }
 
 func (c *volumeServerClient) VolumeMount(ctx context.Context, in *VolumeMountRequest, opts ...grpc.CallOption) (*VolumeMountResponse, error) {
@@ -857,8 +911,8 @@ type VolumeServerServer interface {
 	DeleteCollection(context.Context, *DeleteCollectionRequest) (*DeleteCollectionResponse, error)
 	AssignVolume(context.Context, *AssignVolumeRequest) (*AssignVolumeResponse, error)
 	VolumeSyncStatus(context.Context, *VolumeSyncStatusRequest) (*VolumeSyncStatusResponse, error)
-	VolumeSyncIndex(context.Context, *VolumeSyncIndexRequest) (*VolumeSyncIndexResponse, error)
-	VolumeSyncData(context.Context, *VolumeSyncDataRequest) (*VolumeSyncDataResponse, error)
+	VolumeSyncIndex(*VolumeSyncIndexRequest, VolumeServer_VolumeSyncIndexServer) error
+	VolumeSyncData(*VolumeSyncDataRequest, VolumeServer_VolumeSyncDataServer) error
 	VolumeMount(context.Context, *VolumeMountRequest) (*VolumeMountResponse, error)
 	VolumeUnmount(context.Context, *VolumeUnmountRequest) (*VolumeUnmountResponse, error)
 }
@@ -1011,40 +1065,46 @@ func _VolumeServer_VolumeSyncStatus_Handler(srv interface{}, ctx context.Context
 	return interceptor(ctx, in, info, handler)
 }
 
-func _VolumeServer_VolumeSyncIndex_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
-	in := new(VolumeSyncIndexRequest)
-	if err := dec(in); err != nil {
-		return nil, err
-	}
-	if interceptor == nil {
-		return srv.(VolumeServerServer).VolumeSyncIndex(ctx, in)
+func _VolumeServer_VolumeSyncIndex_Handler(srv interface{}, stream grpc.ServerStream) error {
+	m := new(VolumeSyncIndexRequest)
+	if err := stream.RecvMsg(m); err != nil {
+		return err
 	}
-	info := &grpc.UnaryServerInfo{
-		Server:     srv,
-		FullMethod: "/volume_server_pb.VolumeServer/VolumeSyncIndex",
-	}
-	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
-		return srv.(VolumeServerServer).VolumeSyncIndex(ctx, req.(*VolumeSyncIndexRequest))
-	}
-	return interceptor(ctx, in, info, handler)
+	return srv.(VolumeServerServer).VolumeSyncIndex(m, &volumeServerVolumeSyncIndexServer{stream})
 }
 
-func _VolumeServer_VolumeSyncData_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
-	in := new(VolumeSyncDataRequest)
-	if err := dec(in); err != nil {
-		return nil, err
-	}
-	if interceptor == nil {
-		return srv.(VolumeServerServer).VolumeSyncData(ctx, in)
-	}
-	info := &grpc.UnaryServerInfo{
-		Server:     srv,
-		FullMethod: "/volume_server_pb.VolumeServer/VolumeSyncData",
-	}
-	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
-		return srv.(VolumeServerServer).VolumeSyncData(ctx, req.(*VolumeSyncDataRequest))
+type VolumeServer_VolumeSyncIndexServer interface {
+	Send(*VolumeSyncIndexResponse) error
+	grpc.ServerStream
+}
+
+type volumeServerVolumeSyncIndexServer struct {
+	grpc.ServerStream
+}
+
+func (x *volumeServerVolumeSyncIndexServer) Send(m *VolumeSyncIndexResponse) error {
+	return x.ServerStream.SendMsg(m)
+}
+
+func _VolumeServer_VolumeSyncData_Handler(srv interface{}, stream grpc.ServerStream) error {
+	m := new(VolumeSyncDataRequest)
+	if err := stream.RecvMsg(m); err != nil {
+		return err
 	}
-	return interceptor(ctx, in, info, handler)
+	return srv.(VolumeServerServer).VolumeSyncData(m, &volumeServerVolumeSyncDataServer{stream})
+}
+
+type VolumeServer_VolumeSyncDataServer interface {
+	Send(*VolumeSyncDataResponse) error
+	grpc.ServerStream
+}
+
+type volumeServerVolumeSyncDataServer struct {
+	grpc.ServerStream
+}
+
+func (x *volumeServerVolumeSyncDataServer) Send(m *VolumeSyncDataResponse) error {
+	return x.ServerStream.SendMsg(m)
 }
 
 func _VolumeServer_VolumeMount_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
@@ -1119,14 +1179,6 @@ var _VolumeServer_serviceDesc = grpc.ServiceDesc{
 			MethodName: "VolumeSyncStatus",
 			Handler:    _VolumeServer_VolumeSyncStatus_Handler,
 		},
-		{
-			MethodName: "VolumeSyncIndex",
-			Handler:    _VolumeServer_VolumeSyncIndex_Handler,
-		},
-		{
-			MethodName: "VolumeSyncData",
-			Handler:    _VolumeServer_VolumeSyncData_Handler,
-		},
 		{
 			MethodName: "VolumeMount",
 			Handler:    _VolumeServer_VolumeMount_Handler,
@@ -1136,76 +1188,87 @@ var _VolumeServer_serviceDesc = grpc.ServiceDesc{
 			Handler:    _VolumeServer_VolumeUnmount_Handler,
 		},
 	},
-	Streams:  []grpc.StreamDesc{},
+	Streams: []grpc.StreamDesc{
+		{
+			StreamName:    "VolumeSyncIndex",
+			Handler:       _VolumeServer_VolumeSyncIndex_Handler,
+			ServerStreams: true,
+		},
+		{
+			StreamName:    "VolumeSyncData",
+			Handler:       _VolumeServer_VolumeSyncData_Handler,
+			ServerStreams: true,
+		},
+	},
 	Metadata: "volume_server.proto",
 }
 
 func init() { proto.RegisterFile("volume_server.proto", fileDescriptor0) }
 
 var fileDescriptor0 = []byte{
-	// 1013 bytes of a gzipped FileDescriptorProto
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-	0xdf, 0x2a, 0x0d, 0x00, 0x00,
+	// 1015 bytes of a gzipped FileDescriptorProto
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+	0xb5, 0x4b, 0x63, 0x9c, 0x6f, 0xc9, 0xff, 0x4d, 0x8f, 0xff, 0x09, 0x00, 0x00, 0xff, 0xff, 0x5d,
+	0xf3, 0x60, 0x76, 0x4e, 0x0d, 0x00, 0x00,
 }
diff --git a/weed/server/volume_grpc_sync.go b/weed/server/volume_grpc_sync.go
index 084069211..5f56ec17d 100644
--- a/weed/server/volume_grpc_sync.go
+++ b/weed/server/volume_grpc_sync.go
@@ -25,13 +25,11 @@ func (vs *VolumeServer) VolumeSyncStatus(ctx context.Context, req *volume_server
 
 }
 
-func (vs *VolumeServer) VolumeSyncIndex(ctx context.Context, req *volume_server_pb.VolumeSyncIndexRequest) (*volume_server_pb.VolumeSyncIndexResponse, error) {
-
-	resp := &volume_server_pb.VolumeSyncIndexResponse{}
+func (vs *VolumeServer) VolumeSyncIndex(req *volume_server_pb.VolumeSyncIndexRequest, stream volume_server_pb.VolumeServer_VolumeSyncIndexServer) error {
 
 	v := vs.store.GetVolume(storage.VolumeId(req.VolumdId))
 	if v == nil {
-		return nil, fmt.Errorf("Not Found Volume Id %d", req.VolumdId)
+		return fmt.Errorf("Not Found Volume Id %d", req.VolumdId)
 	}
 
 	content, err := v.IndexFileContent()
@@ -42,46 +40,62 @@ func (vs *VolumeServer) VolumeSyncIndex(ctx context.Context, req *volume_server_
 		glog.V(2).Infof("sync volume %d index", req.VolumdId)
 	}
 
-	resp.IndexFileContent = content
+	const blockSizeLimit = 1024 * 1024 * 2
+	for i := 0; i < len(content); i += blockSizeLimit {
+		blockSize := len(content) - i
+		if blockSize > blockSizeLimit {
+			blockSize = blockSizeLimit
+		}
+		resp := &volume_server_pb.VolumeSyncIndexResponse{}
+		resp.IndexFileContent = content[i : i+blockSize]
+		stream.Send(resp)
+	}
 
-	return resp, nil
+	return nil
 
 }
 
-func (vs *VolumeServer) VolumeSyncData(ctx context.Context, req *volume_server_pb.VolumeSyncDataRequest) (*volume_server_pb.VolumeSyncDataResponse, error) {
-
-	resp := &volume_server_pb.VolumeSyncDataResponse{}
+func (vs *VolumeServer) VolumeSyncData(req *volume_server_pb.VolumeSyncDataRequest, stream volume_server_pb.VolumeServer_VolumeSyncDataServer) error {
 
 	v := vs.store.GetVolume(storage.VolumeId(req.VolumdId))
 	if v == nil {
-		return nil, fmt.Errorf("Not Found Volume Id %d", req.VolumdId)
+		return fmt.Errorf("Not Found Volume Id %d", req.VolumdId)
 	}
 
 	if uint32(v.SuperBlock.CompactRevision) != req.Revision {
-		return nil, fmt.Errorf("Requested Volume Revision is %d, but current revision is %d", req.Revision, v.SuperBlock.CompactRevision)
+		return fmt.Errorf("Requested Volume Revision is %d, but current revision is %d", req.Revision, v.SuperBlock.CompactRevision)
 	}
 
 	content, err := storage.ReadNeedleBlob(v.DataFile(), int64(req.Offset)*types.NeedlePaddingSize, req.Size, v.Version())
 	if err != nil {
-		return nil, fmt.Errorf("read offset:%d size:%d", req.Offset, req.Size)
+		return fmt.Errorf("read offset:%d size:%d", req.Offset, req.Size)
 	}
 
 	id, err := types.ParseNeedleId(req.NeedleId)
 	if err != nil {
-		return nil, fmt.Errorf("parsing needle id %s: %v", req.NeedleId, err)
+		return fmt.Errorf("parsing needle id %s: %v", req.NeedleId, err)
 	}
 	n := new(storage.Needle)
 	n.ParseNeedleHeader(content)
 	if id != n.Id {
-		return nil, fmt.Errorf("Expected file entry id %d, but found %d", id, n.Id)
+		return fmt.Errorf("Expected file entry id %d, but found %d", id, n.Id)
 	}
 
 	if err != nil {
 		glog.Errorf("sync volume %d data: %v", req.VolumdId, err)
 	}
 
-	resp.FileContent = content
+	const blockSizeLimit = 1024 * 1024 * 2
+	for i := 0; i < len(content); i += blockSizeLimit {
+		blockSize := len(content) - i
+		if blockSize > blockSizeLimit {
+			blockSize = blockSizeLimit
+		}
+		resp := &volume_server_pb.VolumeSyncDataResponse{}
+		resp.FileContent = content[i : i+blockSize]
+		stream.Send(resp)
+	}
 
-	return resp, nil
+	return nil
 
 }
diff --git a/weed/storage/volume_sync.go b/weed/storage/volume_sync.go
index 6eb7a61a5..137a9b4ca 100644
--- a/weed/storage/volume_sync.go
+++ b/weed/storage/volume_sync.go
@@ -3,6 +3,7 @@ package storage
 import (
 	"context"
 	"fmt"
+	"io"
 	"os"
 	"sort"
 
@@ -164,6 +165,7 @@ func (v *Volume) GetVolumeSyncStatus() *volume_server_pb.VolumeSyncStatusRespons
 	if stat, err := v.dataFile.Stat(); err == nil {
 		syncStatus.TailOffset = uint64(stat.Size())
 	}
+	syncStatus.Collection = v.Collection
 	syncStatus.IdxFileSize = v.nm.IndexFileSize()
 	syncStatus.CompactRevision = uint32(v.SuperBlock.CompactRevision)
 	syncStatus.Ttl = v.SuperBlock.Ttl.String()
@@ -188,7 +190,7 @@ func (v *Volume) removeNeedle(key NeedleId) {
 func (v *Volume) fetchNeedle(volumeServer string, needleValue needle.NeedleValue, compactRevision uint16) error {
 
 	return operation.WithVolumeServerClient(volumeServer, func(client volume_server_pb.VolumeServerClient) error {
-		resp, err := client.VolumeSyncData(context.Background(), &volume_server_pb.VolumeSyncDataRequest{
+		stream, err := client.VolumeSyncData(context.Background(), &volume_server_pb.VolumeSyncDataRequest{
 			VolumdId: uint32(v.Id),
 			Revision: uint32(compactRevision),
 			Offset:   uint32(needleValue.Offset),
@@ -198,8 +200,19 @@ func (v *Volume) fetchNeedle(volumeServer string, needleValue needle.NeedleValue
 		if err != nil {
 			return err
 		}
+		var fileContent []byte
+		for {
+			resp, err := stream.Recv()
+			if err == io.EOF {
+				break
+			}
+			if err != nil {
+				return fmt.Errorf("read needle %v: %v", needleValue.Key.String(), err)
+			}
+			fileContent = append(fileContent, resp.FileContent...)
+		}
 
-		offset, err := v.AppendBlob(resp.FileContent)
+		offset, err := v.AppendBlob(fileContent)
 		if err != nil {
 			return fmt.Errorf("Appending volume %d error: %v", v.Id, err)
 		}