filer: able to append to a file

4 files changed, 274 insertions, 139 deletions

diff --git a/other/java/client/src/main/proto/filer.proto b/other/java/client/src/main/proto/filer.proto
index fd2b8ebe3..bc159fd14 100644
--- a/other/java/client/src/main/proto/filer.proto
+++ b/other/java/client/src/main/proto/filer.proto
@@ -21,6 +21,9 @@ service SeaweedFiler {
     rpc UpdateEntry (UpdateEntryRequest) returns (UpdateEntryResponse) {
     }
 
+    rpc AppendToEntry (AppendToEntryRequest) returns (AppendToEntryResponse) {
+    }
+
     rpc DeleteEntry (DeleteEntryRequest) returns (DeleteEntryResponse) {
     }
 
@@ -143,6 +146,14 @@ message UpdateEntryRequest {
 message UpdateEntryResponse {
 }
 
+message AppendToEntryRequest {
+    string directory = 1;
+    string entry_name = 2;
+    repeated FileChunk chunks = 3;
+}
+message AppendToEntryResponse {
+}
+
 message DeleteEntryRequest {
     string directory = 1;
     string name = 2;
diff --git a/weed/pb/filer.proto b/weed/pb/filer.proto
index fd2b8ebe3..bc159fd14 100644
--- a/weed/pb/filer.proto
+++ b/weed/pb/filer.proto
@@ -21,6 +21,9 @@ service SeaweedFiler {
     rpc UpdateEntry (UpdateEntryRequest) returns (UpdateEntryResponse) {
     }
 
+    rpc AppendToEntry (AppendToEntryRequest) returns (AppendToEntryResponse) {
+    }
+
     rpc DeleteEntry (DeleteEntryRequest) returns (DeleteEntryResponse) {
     }
 
@@ -143,6 +146,14 @@ message UpdateEntryRequest {
 message UpdateEntryResponse {
 }
 
+message AppendToEntryRequest {
+    string directory = 1;
+    string entry_name = 2;
+    repeated FileChunk chunks = 3;
+}
+message AppendToEntryResponse {
+}
+
 message DeleteEntryRequest {
     string directory = 1;
     string name = 2;
diff --git a/weed/pb/filer_pb/filer.pb.go b/weed/pb/filer_pb/filer.pb.go
index 2454395b4..2f254d22f 100644
--- a/weed/pb/filer_pb/filer.pb.go
+++ b/weed/pb/filer_pb/filer.pb.go
@@ -23,6 +23,8 @@ It has these top-level messages:
 	CreateEntryResponse
 	UpdateEntryRequest
 	UpdateEntryResponse
+	AppendToEntryRequest
+	AppendToEntryResponse
 	DeleteEntryRequest
 	DeleteEntryResponse
 	AtomicRenameEntryRequest
@@ -601,6 +603,46 @@ func (m *UpdateEntryResponse) String() string            { return proto.CompactT
 func (*UpdateEntryResponse) ProtoMessage()               {}
 func (*UpdateEntryResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{13} }
 
+type AppendToEntryRequest struct {
+	Directory string       `protobuf:"bytes,1,opt,name=directory" json:"directory,omitempty"`
+	EntryName string       `protobuf:"bytes,2,opt,name=entry_name,json=entryName" json:"entry_name,omitempty"`
+	Chunks    []*FileChunk `protobuf:"bytes,3,rep,name=chunks" json:"chunks,omitempty"`
+}
+
+func (m *AppendToEntryRequest) Reset()                    { *m = AppendToEntryRequest{} }
+func (m *AppendToEntryRequest) String() string            { return proto.CompactTextString(m) }
+func (*AppendToEntryRequest) ProtoMessage()               {}
+func (*AppendToEntryRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{14} }
+
+func (m *AppendToEntryRequest) GetDirectory() string {
+	if m != nil {
+		return m.Directory
+	}
+	return ""
+}
+
+func (m *AppendToEntryRequest) GetEntryName() string {
+	if m != nil {
+		return m.EntryName
+	}
+	return ""
+}
+
+func (m *AppendToEntryRequest) GetChunks() []*FileChunk {
+	if m != nil {
+		return m.Chunks
+	}
+	return nil
+}
+
+type AppendToEntryResponse struct {
+}
+
+func (m *AppendToEntryResponse) Reset()                    { *m = AppendToEntryResponse{} }
+func (m *AppendToEntryResponse) String() string            { return proto.CompactTextString(m) }
+func (*AppendToEntryResponse) ProtoMessage()               {}
+func (*AppendToEntryResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{15} }
+
 type DeleteEntryRequest struct {
 	Directory string `protobuf:"bytes,1,opt,name=directory" json:"directory,omitempty"`
 	Name      string `protobuf:"bytes,2,opt,name=name" json:"name,omitempty"`
@@ -613,7 +655,7 @@ type DeleteEntryRequest struct {
 func (m *DeleteEntryRequest) Reset()                    { *m = DeleteEntryRequest{} }
 func (m *DeleteEntryRequest) String() string            { return proto.CompactTextString(m) }
 func (*DeleteEntryRequest) ProtoMessage()               {}
-func (*DeleteEntryRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{14} }
+func (*DeleteEntryRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{16} }
 
 func (m *DeleteEntryRequest) GetDirectory() string {
 	if m != nil {
@@ -657,7 +699,7 @@ type DeleteEntryResponse struct {
 func (m *DeleteEntryResponse) Reset()                    { *m = DeleteEntryResponse{} }
 func (m *DeleteEntryResponse) String() string            { return proto.CompactTextString(m) }
 func (*DeleteEntryResponse) ProtoMessage()               {}
-func (*DeleteEntryResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{15} }
+func (*DeleteEntryResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{17} }
 
 func (m *DeleteEntryResponse) GetError() string {
 	if m != nil {
@@ -676,7 +718,7 @@ type AtomicRenameEntryRequest struct {
 func (m *AtomicRenameEntryRequest) Reset()                    { *m = AtomicRenameEntryRequest{} }
 func (m *AtomicRenameEntryRequest) String() string            { return proto.CompactTextString(m) }
 func (*AtomicRenameEntryRequest) ProtoMessage()               {}
-func (*AtomicRenameEntryRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{16} }
+func (*AtomicRenameEntryRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{18} }
 
 func (m *AtomicRenameEntryRequest) GetOldDirectory() string {
 	if m != nil {
@@ -712,7 +754,7 @@ type AtomicRenameEntryResponse struct {
 func (m *AtomicRenameEntryResponse) Reset()                    { *m = AtomicRenameEntryResponse{} }
 func (m *AtomicRenameEntryResponse) String() string            { return proto.CompactTextString(m) }
 func (*AtomicRenameEntryResponse) ProtoMessage()               {}
-func (*AtomicRenameEntryResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{17} }
+func (*AtomicRenameEntryResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{19} }
 
 type AssignVolumeRequest struct {
 	Count       int32  `protobuf:"varint,1,opt,name=count" json:"count,omitempty"`
@@ -726,7 +768,7 @@ type AssignVolumeRequest struct {
 func (m *AssignVolumeRequest) Reset()                    { *m = AssignVolumeRequest{} }
 func (m *AssignVolumeRequest) String() string            { return proto.CompactTextString(m) }
 func (*AssignVolumeRequest) ProtoMessage()               {}
-func (*AssignVolumeRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{18} }
+func (*AssignVolumeRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{20} }
 
 func (m *AssignVolumeRequest) GetCount() int32 {
 	if m != nil {
@@ -784,7 +826,7 @@ type AssignVolumeResponse struct {
 func (m *AssignVolumeResponse) Reset()                    { *m = AssignVolumeResponse{} }
 func (m *AssignVolumeResponse) String() string            { return proto.CompactTextString(m) }
 func (*AssignVolumeResponse) ProtoMessage()               {}
-func (*AssignVolumeResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{19} }
+func (*AssignVolumeResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{21} }
 
 func (m *AssignVolumeResponse) GetFileId() string {
 	if m != nil {
@@ -849,7 +891,7 @@ type LookupVolumeRequest struct {
 func (m *LookupVolumeRequest) Reset()                    { *m = LookupVolumeRequest{} }
 func (m *LookupVolumeRequest) String() string            { return proto.CompactTextString(m) }
 func (*LookupVolumeRequest) ProtoMessage()               {}
-func (*LookupVolumeRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{20} }
+func (*LookupVolumeRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{22} }
 
 func (m *LookupVolumeRequest) GetVolumeIds() []string {
 	if m != nil {
@@ -865,7 +907,7 @@ type Locations struct {
 func (m *Locations) Reset()                    { *m = Locations{} }
 func (m *Locations) String() string            { return proto.CompactTextString(m) }
 func (*Locations) ProtoMessage()               {}
-func (*Locations) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{21} }
+func (*Locations) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{23} }
 
 func (m *Locations) GetLocations() []*Location {
 	if m != nil {
@@ -882,7 +924,7 @@ type Location struct {
 func (m *Location) Reset()                    { *m = Location{} }
 func (m *Location) String() string            { return proto.CompactTextString(m) }
 func (*Location) ProtoMessage()               {}
-func (*Location) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{22} }
+func (*Location) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{24} }
 
 func (m *Location) GetUrl() string {
 	if m != nil {
@@ -905,7 +947,7 @@ type LookupVolumeResponse struct {
 func (m *LookupVolumeResponse) Reset()                    { *m = LookupVolumeResponse{} }
 func (m *LookupVolumeResponse) String() string            { return proto.CompactTextString(m) }
 func (*LookupVolumeResponse) ProtoMessage()               {}
-func (*LookupVolumeResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{23} }
+func (*LookupVolumeResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{25} }
 
 func (m *LookupVolumeResponse) GetLocationsMap() map[string]*Locations {
 	if m != nil {
@@ -921,7 +963,7 @@ type DeleteCollectionRequest struct {
 func (m *DeleteCollectionRequest) Reset()                    { *m = DeleteCollectionRequest{} }
 func (m *DeleteCollectionRequest) String() string            { return proto.CompactTextString(m) }
 func (*DeleteCollectionRequest) ProtoMessage()               {}
-func (*DeleteCollectionRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{24} }
+func (*DeleteCollectionRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{26} }
 
 func (m *DeleteCollectionRequest) GetCollection() string {
 	if m != nil {
@@ -936,7 +978,7 @@ type DeleteCollectionResponse struct {
 func (m *DeleteCollectionResponse) Reset()                    { *m = DeleteCollectionResponse{} }
 func (m *DeleteCollectionResponse) String() string            { return proto.CompactTextString(m) }
 func (*DeleteCollectionResponse) ProtoMessage()               {}
-func (*DeleteCollectionResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{25} }
+func (*DeleteCollectionResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{27} }
 
 type StatisticsRequest struct {
 	Replication string `protobuf:"bytes,1,opt,name=replication" json:"replication,omitempty"`
@@ -947,7 +989,7 @@ type StatisticsRequest struct {
 func (m *StatisticsRequest) Reset()                    { *m = StatisticsRequest{} }
 func (m *StatisticsRequest) String() string            { return proto.CompactTextString(m) }
 func (*StatisticsRequest) ProtoMessage()               {}
-func (*StatisticsRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{26} }
+func (*StatisticsRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{28} }
 
 func (m *StatisticsRequest) GetReplication() string {
 	if m != nil {
@@ -982,7 +1024,7 @@ type StatisticsResponse struct {
 func (m *StatisticsResponse) Reset()                    { *m = StatisticsResponse{} }
 func (m *StatisticsResponse) String() string            { return proto.CompactTextString(m) }
 func (*StatisticsResponse) ProtoMessage()               {}
-func (*StatisticsResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{27} }
+func (*StatisticsResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{29} }
 
 func (m *StatisticsResponse) GetReplication() string {
 	if m != nil {
@@ -1032,7 +1074,7 @@ type GetFilerConfigurationRequest struct {
 func (m *GetFilerConfigurationRequest) Reset()                    { *m = GetFilerConfigurationRequest{} }
 func (m *GetFilerConfigurationRequest) String() string            { return proto.CompactTextString(m) }
 func (*GetFilerConfigurationRequest) ProtoMessage()               {}
-func (*GetFilerConfigurationRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{28} }
+func (*GetFilerConfigurationRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{30} }
 
 type GetFilerConfigurationResponse struct {
 	Masters     []string `protobuf:"bytes,1,rep,name=masters" json:"masters,omitempty"`
@@ -1046,7 +1088,7 @@ type GetFilerConfigurationResponse struct {
 func (m *GetFilerConfigurationResponse) Reset()                    { *m = GetFilerConfigurationResponse{} }
 func (m *GetFilerConfigurationResponse) String() string            { return proto.CompactTextString(m) }
 func (*GetFilerConfigurationResponse) ProtoMessage()               {}
-func (*GetFilerConfigurationResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{29} }
+func (*GetFilerConfigurationResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{31} }
 
 func (m *GetFilerConfigurationResponse) GetMasters() []string {
 	if m != nil {
@@ -1099,7 +1141,7 @@ type SubscribeMetadataRequest struct {
 func (m *SubscribeMetadataRequest) Reset()                    { *m = SubscribeMetadataRequest{} }
 func (m *SubscribeMetadataRequest) String() string            { return proto.CompactTextString(m) }
 func (*SubscribeMetadataRequest) ProtoMessage()               {}
-func (*SubscribeMetadataRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{30} }
+func (*SubscribeMetadataRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{32} }
 
 func (m *SubscribeMetadataRequest) GetClientName() string {
 	if m != nil {
@@ -1130,7 +1172,7 @@ type SubscribeMetadataResponse struct {
 func (m *SubscribeMetadataResponse) Reset()                    { *m = SubscribeMetadataResponse{} }
 func (m *SubscribeMetadataResponse) String() string            { return proto.CompactTextString(m) }
 func (*SubscribeMetadataResponse) ProtoMessage()               {}
-func (*SubscribeMetadataResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{31} }
+func (*SubscribeMetadataResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{33} }
 
 func (m *SubscribeMetadataResponse) GetDirectory() string {
 	if m != nil {
@@ -1155,7 +1197,7 @@ type LogEntry struct {
 func (m *LogEntry) Reset()                    { *m = LogEntry{} }
 func (m *LogEntry) String() string            { return proto.CompactTextString(m) }
 func (*LogEntry) ProtoMessage()               {}
-func (*LogEntry) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{32} }
+func (*LogEntry) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{34} }
 
 func (m *LogEntry) GetTsNs() int64 {
 	if m != nil {
@@ -1193,6 +1235,8 @@ func init() {
 	proto.RegisterType((*CreateEntryResponse)(nil), "filer_pb.CreateEntryResponse")
 	proto.RegisterType((*UpdateEntryRequest)(nil), "filer_pb.UpdateEntryRequest")
 	proto.RegisterType((*UpdateEntryResponse)(nil), "filer_pb.UpdateEntryResponse")
+	proto.RegisterType((*AppendToEntryRequest)(nil), "filer_pb.AppendToEntryRequest")
+	proto.RegisterType((*AppendToEntryResponse)(nil), "filer_pb.AppendToEntryResponse")
 	proto.RegisterType((*DeleteEntryRequest)(nil), "filer_pb.DeleteEntryRequest")
 	proto.RegisterType((*DeleteEntryResponse)(nil), "filer_pb.DeleteEntryResponse")
 	proto.RegisterType((*AtomicRenameEntryRequest)(nil), "filer_pb.AtomicRenameEntryRequest")
@@ -1229,6 +1273,7 @@ type SeaweedFilerClient interface {
 	ListEntries(ctx context.Context, in *ListEntriesRequest, opts ...grpc.CallOption) (SeaweedFiler_ListEntriesClient, error)
 	CreateEntry(ctx context.Context, in *CreateEntryRequest, opts ...grpc.CallOption) (*CreateEntryResponse, error)
 	UpdateEntry(ctx context.Context, in *UpdateEntryRequest, opts ...grpc.CallOption) (*UpdateEntryResponse, error)
+	AppendToEntry(ctx context.Context, in *AppendToEntryRequest, opts ...grpc.CallOption) (*AppendToEntryResponse, error)
 	DeleteEntry(ctx context.Context, in *DeleteEntryRequest, opts ...grpc.CallOption) (*DeleteEntryResponse, error)
 	AtomicRenameEntry(ctx context.Context, in *AtomicRenameEntryRequest, opts ...grpc.CallOption) (*AtomicRenameEntryResponse, error)
 	AssignVolume(ctx context.Context, in *AssignVolumeRequest, opts ...grpc.CallOption) (*AssignVolumeResponse, error)
@@ -1306,6 +1351,15 @@ func (c *seaweedFilerClient) UpdateEntry(ctx context.Context, in *UpdateEntryReq
 	return out, nil
 }
 
+func (c *seaweedFilerClient) AppendToEntry(ctx context.Context, in *AppendToEntryRequest, opts ...grpc.CallOption) (*AppendToEntryResponse, error) {
+	out := new(AppendToEntryResponse)
+	err := grpc.Invoke(ctx, "/filer_pb.SeaweedFiler/AppendToEntry", in, out, c.cc, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 func (c *seaweedFilerClient) DeleteEntry(ctx context.Context, in *DeleteEntryRequest, opts ...grpc.CallOption) (*DeleteEntryResponse, error) {
 	out := new(DeleteEntryResponse)
 	err := grpc.Invoke(ctx, "/filer_pb.SeaweedFiler/DeleteEntry", in, out, c.cc, opts...)
@@ -1408,6 +1462,7 @@ type SeaweedFilerServer interface {
 	ListEntries(*ListEntriesRequest, SeaweedFiler_ListEntriesServer) error
 	CreateEntry(context.Context, *CreateEntryRequest) (*CreateEntryResponse, error)
 	UpdateEntry(context.Context, *UpdateEntryRequest) (*UpdateEntryResponse, error)
+	AppendToEntry(context.Context, *AppendToEntryRequest) (*AppendToEntryResponse, error)
 	DeleteEntry(context.Context, *DeleteEntryRequest) (*DeleteEntryResponse, error)
 	AtomicRenameEntry(context.Context, *AtomicRenameEntryRequest) (*AtomicRenameEntryResponse, error)
 	AssignVolume(context.Context, *AssignVolumeRequest) (*AssignVolumeResponse, error)
@@ -1497,6 +1552,24 @@ func _SeaweedFiler_UpdateEntry_Handler(srv interface{}, ctx context.Context, dec
 	return interceptor(ctx, in, info, handler)
 }
 
+func _SeaweedFiler_AppendToEntry_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(AppendToEntryRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(SeaweedFilerServer).AppendToEntry(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/filer_pb.SeaweedFiler/AppendToEntry",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(SeaweedFilerServer).AppendToEntry(ctx, req.(*AppendToEntryRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 func _SeaweedFiler_DeleteEntry_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
 	in := new(DeleteEntryRequest)
 	if err := dec(in); err != nil {
@@ -1661,6 +1734,10 @@ var _SeaweedFiler_serviceDesc = grpc.ServiceDesc{
 			Handler:    _SeaweedFiler_UpdateEntry_Handler,
 		},
 		{
+			MethodName: "AppendToEntry",
+			Handler:    _SeaweedFiler_AppendToEntry_Handler,
+		},
+		{
 			MethodName: "DeleteEntry",
 			Handler:    _SeaweedFiler_DeleteEntry_Handler,
 		},
@@ -1707,124 +1784,128 @@ var _SeaweedFiler_serviceDesc = grpc.ServiceDesc{
 func init() { proto.RegisterFile("filer.proto", fileDescriptor0) }
 
 var fileDescriptor0 = []byte{
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+	0xf5, 0x3f, 0xf7, 0xa5, 0x9f, 0xb7, 0x4d, 0x4e, 0x83, 0x8c, 0xab, 0x0e, 0x8e, 0x25, 0x83, 0x6d,
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+	0xb0, 0x35, 0xc7, 0xb6, 0x3c, 0x5c, 0xff, 0xb6, 0x60, 0xfd, 0xa9, 0x10, 0x6c, 0x18, 0xff, 0x1a,
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+	0x44, 0x36, 0xc6, 0x9f, 0x69, 0x0a, 0xce, 0x76, 0x38, 0xe8, 0x22, 0x0c, 0xb4, 0xdc, 0x7c, 0xe7,
+	0x5c, 0x40, 0xef, 0x24, 0x1b, 0x88, 0x80, 0xb3, 0x01, 0x7d, 0x4d, 0xa5, 0xaf, 0xc0, 0xb0, 0xc8,
+	0x91, 0x7b, 0xd0, 0x0e, 0x22, 0xa6, 0xd0, 0xd0, 0xf8, 0x92, 0x04, 0x4d, 0xc2, 0xae, 0x81, 0x70,
+	0x29, 0x47, 0x5e, 0xe5, 0xe3, 0x19, 0x14, 0xe9, 0x8d, 0xfe, 0x80, 0xde, 0x82, 0x96, 0x60, 0x71,
+	0x40, 0xbd, 0x58, 0x7f, 0xb1, 0xd4, 0xdd, 0x15, 0xdc, 0x1f, 0x0b, 0xe7, 0xcf, 0x16, 0x6c, 0xcd,
+	0xb9, 0x39, 0x77, 0xe1, 0xf5, 0xad, 0xfc, 0x57, 0x40, 0xe8, 0x39, 0xda, 0x65, 0x7c, 0x7f, 0xe5,
+	0x45, 0x76, 0xd7, 0x18, 0x73, 0xa6, 0x3f, 0xd1, 0xdc, 0x35, 0x3a, 0x4d, 0x72, 0x7c, 0x85, 0x3b,
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+	0x63, 0x20, 0xa9, 0xcf, 0x25, 0x53, 0xd2, 0x6a, 0xa8, 0xf7, 0x46, 0xbe, 0x18, 0xe1, 0x65, 0x0d,
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+	0x5a, 0xe2, 0xfa, 0xe0, 0x7f, 0x2d, 0xe8, 0x9c, 0x50, 0xff, 0x82, 0xd2, 0x10, 0xb3, 0x86, 0x0c,
+	0x0b, 0xb4, 0xaa, 0xfe, 0xeb, 0x20, 0x0f, 0xa6, 0x61, 0x69, 0xee, 0xcf, 0x95, 0xfe, 0x27, 0x37,
+	0x89, 0xe5, 0x85, 0xbf, 0x44, 0x8e, 0xa1, 0x6d, 0xfc, 0x4c, 0x20, 0xdb, 0xc6, 0xc1, 0x99, 0x7f,
+	0x24, 0xfd, 0x9d, 0x05, 0xdc, 0x42, 0xdb, 0x13, 0x8b, 0xbc, 0x82, 0xb6, 0x31, 0xb3, 0x9a, 0xfa,
+	0x66, 0x87, 0x67, 0x53, 0xdf, 0x9c, 0x41, 0xd7, 0x59, 0x52, 0xda, 0x8c, 0xc9, 0xd3, 0xd4, 0x36,
+	0x3b, 0xeb, 0x9a, 0xda, 0xe6, 0x8d, 0xab, 0x4b, 0xc4, 0x85, 0x6e, 0x65, 0x5a, 0x24, 0xbb, 0x93,
+	0x13, 0xf3, 0x06, 0xd9, 0xfe, 0xbd, 0x85, 0x7c, 0xd3, 0x42, 0x63, 0x40, 0x33, 0x2d, 0x9c, 0x1d,
+	0x3f, 0x4d, 0x0b, 0xe7, 0x4c, 0x75, 0xce, 0x12, 0xf9, 0x3d, 0xac, 0xcd, 0x0c, 0x49, 0xc4, 0x31,
+	0xac, 0x58, 0x30, 0xdd, 0xf5, 0xef, 0x5f, 0x2b, 0x53, 0xea, 0xff, 0x1a, 0x3a, 0xe6, 0x6c, 0x42,
+	0x0c, 0x83, 0xe6, 0x8c, 0x5f, 0xfd, 0xdd, 0x45, 0x6c, 0x53, 0xa1, 0xd9, 0x1e, 0x4d, 0x85, 0x73,
+	0x06, 0x04, 0x53, 0xe1, 0xbc, 0xae, 0xea, 0x2c, 0x91, 0xdf, 0xc1, 0xea, 0x74, 0x9b, 0x22, 0x1f,
+	0x4f, 0xbb, 0x6d, 0xa6, 0xfb, 0xf5, 0x9d, 0xeb, 0x44, 0x4a, 0xe5, 0x2f, 0x01, 0x26, 0xdd, 0x87,
+	0x18, 0x38, 0x30, 0xd3, 0xfd, 0xfa, 0xdb, 0xf3, 0x99, 0xa5, 0xaa, 0x3f, 0xc2, 0xe6, 0x5c, 0x88,
+	0x27, 0x46, 0xe9, 0x5d, 0xd7, 0x24, 0xfa, 0x3f, 0xbc, 0x51, 0xae, 0xbc, 0xeb, 0x0f, 0xb0, 0x36,
+	0x83, 0x83, 0x66, 0x56, 0x2c, 0x82, 0x67, 0x33, 0x2b, 0x16, 0x02, 0xa9, 0xaa, 0xda, 0x67, 0xbb,
+	0xb0, 0x2a, 0x34, 0xfc, 0x9c, 0x8a, 0x7d, 0x0d, 0xdf, 0xcf, 0x00, 0x6d, 0x7a, 0xc3, 0x13, 0x99,
+	0x0c, 0x9a, 0xf8, 0x73, 0xf7, 0x27, 0xff, 0x0f, 0x00, 0x00, 0xff, 0xff, 0xc4, 0x22, 0xe9, 0x54,
+	0xeb, 0x15, 0x00, 0x00,
 }
diff --git a/weed/server/filer_grpc_server.go b/weed/server/filer_grpc_server.go
index 549553acc..999d14b8e 100644
--- a/weed/server/filer_grpc_server.go
+++ b/weed/server/filer_grpc_server.go
@@ -217,6 +217,38 @@ func (fs *FilerServer) UpdateEntry(ctx context.Context, req *filer_pb.UpdateEntr
 	return &filer_pb.UpdateEntryResponse{}, err
 }
 
+func (fs *FilerServer) AppendToEntry(ctx context.Context, req *filer_pb.AppendToEntryRequest) (*filer_pb.AppendToEntryResponse, error) {
+
+	fullpath := util.NewFullPath(req.Directory, req.EntryName)
+	var offset int64 = 0
+	entry, err := fs.filer.FindEntry(ctx, util.FullPath(fullpath))
+	if err == filer_pb.ErrNotFound {
+		entry = &filer2.Entry{
+			FullPath: fullpath,
+			Attr: filer2.Attr{
+				Crtime: time.Now(),
+				Mtime:  time.Now(),
+				Mode:   os.FileMode(0644),
+				Uid:    OS_UID,
+				Gid:    OS_GID,
+			},
+		}
+	} else {
+		offset = int64(filer2.TotalSize(entry.Chunks))
+	}
+
+	for _, chunk := range req.Chunks {
+		chunk.Offset = offset
+		offset += int64(chunk.Size)
+	}
+
+	entry.Chunks = append(entry.Chunks, req.Chunks...)
+
+	err = fs.filer.CreateEntry(context.Background(), entry, false)
+
+	return &filer_pb.AppendToEntryResponse{}, err
+}
+
 func (fs *FilerServer) DeleteEntry(ctx context.Context, req *filer_pb.DeleteEntryRequest) (resp *filer_pb.DeleteEntryResponse, err error) {
 	err = fs.filer.DeleteEntryMetaAndData(ctx, util.JoinPath(req.Directory, req.Name), req.IsRecursive, req.IgnoreRecursiveError, req.IsDeleteData)
 	resp = &filer_pb.DeleteEntryResponse{}