broadcast messages of new and deleted volumes

7 files changed, 251 insertions, 77 deletions

diff --git a/weed/filer2/filer_master.go b/weed/filer2/filer_master.go
index 63c3ef452..bbac17940 100644
--- a/weed/filer2/filer_master.go
+++ b/weed/filer2/filer_master.go
@@ -3,11 +3,10 @@ package filer2
 import (
 	"context"
 	"fmt"
-	"time"
-
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
 	"github.com/chrislusf/seaweedfs/weed/util"
+	"time"
 )
 
 func (fs *Filer) GetMaster() string {
@@ -16,6 +15,13 @@ func (fs *Filer) GetMaster() string {
 
 func (fs *Filer) KeepConnectedToMaster() {
 	glog.V(0).Infof("Filer bootstraps with masters %v", fs.masters)
+	for {
+		fs.tryAllMasters()
+		time.Sleep(time.Second)
+	}
+}
+
+func (fs *Filer) tryAllMasters() {
 	for _, master := range fs.masters {
 		glog.V(0).Infof("Connecting to %v", master)
 		withMasterClient(master, func(client master_pb.SeaweedClient) error {
@@ -28,17 +34,17 @@ func (fs *Filer) KeepConnectedToMaster() {
 			glog.V(0).Infof("Connected to %v", master)
 			fs.currentMaster = master
 
-			for {
-				time.Sleep(time.Duration(float32(10*1e3)*0.25) * time.Millisecond)
-
-				if err = stream.Send(&master_pb.Empty{}); err != nil {
-					glog.V(0).Infof("failed to send to %s: %v", master, err)
-					return err
-				}
+			if err = stream.Send(&master_pb.ClientListenRequest{Name: "filer"}); err != nil {
+				glog.V(0).Infof("failed to send to %s: %v", master, err)
+				return err
+			}
 
-				if _, err = stream.Recv(); err != nil {
+			for {
+				if volumeLocation, err := stream.Recv(); err != nil {
 					glog.V(0).Infof("failed to receive from %s: %v", master, err)
 					return err
+				} else {
+					glog.V(0).Infof("volume location: %+v", volumeLocation)
 				}
 			}
 		})
diff --git a/weed/pb/master_pb/seaweed.pb.go b/weed/pb/master_pb/seaweed.pb.go
index 5416e19b0..15a72f0bf 100644
--- a/weed/pb/master_pb/seaweed.pb.go
+++ b/weed/pb/master_pb/seaweed.pb.go
@@ -14,6 +14,8 @@ It has these top-level messages:
 	VolumeInformationMessage
 	Empty
 	SuperBlockExtra
+	ClientListenRequest
+	VolumeLocation
 */
 package master_pb
 
@@ -295,6 +297,62 @@ func (m *SuperBlockExtra_ErasureCoding) GetVolumeIds() []uint32 {
 	return nil
 }
 
+type ClientListenRequest struct {
+	Name string `protobuf:"bytes,1,opt,name=name" json:"name,omitempty"`
+}
+
+func (m *ClientListenRequest) Reset()                    { *m = ClientListenRequest{} }
+func (m *ClientListenRequest) String() string            { return proto.CompactTextString(m) }
+func (*ClientListenRequest) ProtoMessage()               {}
+func (*ClientListenRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{5} }
+
+func (m *ClientListenRequest) GetName() string {
+	if m != nil {
+		return m.Name
+	}
+	return ""
+}
+
+type VolumeLocation struct {
+	Url         string   `protobuf:"bytes,1,opt,name=url" json:"url,omitempty"`
+	PublicUrl   string   `protobuf:"bytes,2,opt,name=public_url,json=publicUrl" json:"public_url,omitempty"`
+	NewVids     []uint32 `protobuf:"varint,3,rep,packed,name=new_vids,json=newVids" json:"new_vids,omitempty"`
+	DeletedVids []uint32 `protobuf:"varint,4,rep,packed,name=deleted_vids,json=deletedVids" json:"deleted_vids,omitempty"`
+}
+
+func (m *VolumeLocation) Reset()                    { *m = VolumeLocation{} }
+func (m *VolumeLocation) String() string            { return proto.CompactTextString(m) }
+func (*VolumeLocation) ProtoMessage()               {}
+func (*VolumeLocation) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{6} }
+
+func (m *VolumeLocation) GetUrl() string {
+	if m != nil {
+		return m.Url
+	}
+	return ""
+}
+
+func (m *VolumeLocation) GetPublicUrl() string {
+	if m != nil {
+		return m.PublicUrl
+	}
+	return ""
+}
+
+func (m *VolumeLocation) GetNewVids() []uint32 {
+	if m != nil {
+		return m.NewVids
+	}
+	return nil
+}
+
+func (m *VolumeLocation) GetDeletedVids() []uint32 {
+	if m != nil {
+		return m.DeletedVids
+	}
+	return nil
+}
+
 func init() {
 	proto.RegisterType((*Heartbeat)(nil), "master_pb.Heartbeat")
 	proto.RegisterType((*HeartbeatResponse)(nil), "master_pb.HeartbeatResponse")
@@ -302,6 +360,8 @@ func init() {
 	proto.RegisterType((*Empty)(nil), "master_pb.Empty")
 	proto.RegisterType((*SuperBlockExtra)(nil), "master_pb.SuperBlockExtra")
 	proto.RegisterType((*SuperBlockExtra_ErasureCoding)(nil), "master_pb.SuperBlockExtra.ErasureCoding")
+	proto.RegisterType((*ClientListenRequest)(nil), "master_pb.ClientListenRequest")
+	proto.RegisterType((*VolumeLocation)(nil), "master_pb.VolumeLocation")
 }
 
 // Reference imports to suppress errors if they are not otherwise used.
@@ -368,8 +428,8 @@ func (c *seaweedClient) KeepConnected(ctx context.Context, opts ...grpc.CallOpti
 }
 
 type Seaweed_KeepConnectedClient interface {
-	Send(*Empty) error
-	Recv() (*Empty, error)
+	Send(*ClientListenRequest) error
+	Recv() (*VolumeLocation, error)
 	grpc.ClientStream
 }
 
@@ -377,12 +437,12 @@ type seaweedKeepConnectedClient struct {
 	grpc.ClientStream
 }
 
-func (x *seaweedKeepConnectedClient) Send(m *Empty) error {
+func (x *seaweedKeepConnectedClient) Send(m *ClientListenRequest) error {
 	return x.ClientStream.SendMsg(m)
 }
 
-func (x *seaweedKeepConnectedClient) Recv() (*Empty, error) {
-	m := new(Empty)
+func (x *seaweedKeepConnectedClient) Recv() (*VolumeLocation, error) {
+	m := new(VolumeLocation)
 	if err := x.ClientStream.RecvMsg(m); err != nil {
 		return nil, err
 	}
@@ -431,8 +491,8 @@ func _Seaweed_KeepConnected_Handler(srv interface{}, stream grpc.ServerStream) e
 }
 
 type Seaweed_KeepConnectedServer interface {
-	Send(*Empty) error
-	Recv() (*Empty, error)
+	Send(*VolumeLocation) error
+	Recv() (*ClientListenRequest, error)
 	grpc.ServerStream
 }
 
@@ -440,12 +500,12 @@ type seaweedKeepConnectedServer struct {
 	grpc.ServerStream
 }
 
-func (x *seaweedKeepConnectedServer) Send(m *Empty) error {
+func (x *seaweedKeepConnectedServer) Send(m *VolumeLocation) error {
 	return x.ServerStream.SendMsg(m)
 }
 
-func (x *seaweedKeepConnectedServer) Recv() (*Empty, error) {
-	m := new(Empty)
+func (x *seaweedKeepConnectedServer) Recv() (*ClientListenRequest, error) {
+	m := new(ClientListenRequest)
 	if err := x.ServerStream.RecvMsg(m); err != nil {
 		return nil, err
 	}
@@ -476,45 +536,50 @@ var _Seaweed_serviceDesc = grpc.ServiceDesc{
 func init() { proto.RegisterFile("seaweed.proto", fileDescriptor0) }
 
 var fileDescriptor0 = []byte{
-	// 627 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x09, 0x6e, 0x88, 0x02, 0xff, 0x74, 0x94, 0xcf, 0x6e, 0xd3, 0x40,
-	0x10, 0xc6, 0x71, 0x92, 0x26, 0xf5, 0xa4, 0x6e, 0xd3, 0x15, 0x42, 0x56, 0x29, 0x10, 0xc2, 0xc5,
-	0x12, 0x28, 0x42, 0xe5, 0xc4, 0x81, 0x4b, 0xa3, 0x22, 0xaa, 0x82, 0x5a, 0x39, 0x82, 0x03, 0x17,
-	0x6b, 0xe3, 0x9d, 0x56, 0xab, 0xae, 0xff, 0x68, 0x77, 0x53, 0xe2, 0xbe, 0x04, 0x4f, 0xc2, 0x2b,
-	0x70, 0xe2, 0xc1, 0xd0, 0x8e, 0xed, 0x34, 0x14, 0xb8, 0xcd, 0xfc, 0x66, 0xc6, 0x3b, 0xf9, 0xbe,
-	0xdd, 0x40, 0x60, 0x90, 0x7f, 0x43, 0x14, 0xd3, 0x52, 0x17, 0xb6, 0x60, 0x7e, 0xc6, 0x8d, 0x45,
-	0x9d, 0x94, 0x8b, 0xc9, 0x8f, 0x0e, 0xf8, 0x1f, 0x90, 0x6b, 0xbb, 0x40, 0x6e, 0xd9, 0x2e, 0x74,
-	0x64, 0x19, 0x7a, 0x63, 0x2f, 0xf2, 0xe3, 0x8e, 0x2c, 0x19, 0x83, 0x5e, 0x59, 0x68, 0x1b, 0x76,
-	0xc6, 0x5e, 0x14, 0xc4, 0x14, 0xb3, 0x27, 0x00, 0xe5, 0x72, 0xa1, 0x64, 0x9a, 0x2c, 0xb5, 0x0a,
-	0xbb, 0xd4, 0xeb, 0xd7, 0xe4, 0xb3, 0x56, 0x2c, 0x82, 0x51, 0xc6, 0x57, 0xc9, 0x4d, 0xa1, 0x96,
-	0x19, 0x26, 0x69, 0xb1, 0xcc, 0x6d, 0xd8, 0xa3, 0xf1, 0xdd, 0x8c, 0xaf, 0xbe, 0x10, 0x9e, 0x39,
-	0xca, 0xc6, 0xb0, 0xe3, 0x3a, 0x2f, 0xa5, 0xc2, 0xe4, 0x1a, 0xab, 0x70, 0x6b, 0xec, 0x45, 0xbd,
-	0x18, 0x32, 0xbe, 0x7a, 0x2f, 0x15, 0x9e, 0x61, 0xc5, 0x9e, 0xc1, 0x50, 0x70, 0xcb, 0x93, 0x14,
-	0x73, 0x8b, 0x3a, 0xec, 0xd3, 0x59, 0xe0, 0xd0, 0x8c, 0x88, 0xdb, 0x4f, 0xf3, 0xf4, 0x3a, 0x1c,
-	0x50, 0x85, 0x62, 0xb7, 0x1f, 0x17, 0x99, 0xcc, 0x13, 0xda, 0x7c, 0x9b, 0x8e, 0xf6, 0x89, 0x5c,
-	0xb8, 0xf5, 0xdf, 0xc1, 0xa0, 0xde, 0xcd, 0x84, 0xfe, 0xb8, 0x1b, 0x0d, 0x8f, 0x5e, 0x4c, 0xd7,
-	0x6a, 0x4c, 0xeb, 0xf5, 0x4e, 0xf3, 0xcb, 0x42, 0x67, 0xdc, 0xca, 0x22, 0xff, 0x84, 0xc6, 0xf0,
-	0x2b, 0x8c, 0xdb, 0x99, 0x89, 0x81, 0xfd, 0xb5, 0x5c, 0x31, 0x9a, 0xb2, 0xc8, 0x0d, 0xb2, 0x08,
-	0xf6, 0xea, 0xfa, 0x5c, 0xde, 0xe2, 0x47, 0x99, 0x49, 0x4b, 0x1a, 0xf6, 0xe2, 0xfb, 0x98, 0x1d,
-	0x82, 0x6f, 0x30, 0xd5, 0x68, 0xcf, 0xb0, 0x22, 0x55, 0xfd, 0xf8, 0x0e, 0xb0, 0x47, 0xd0, 0x57,
-	0xc8, 0x05, 0xea, 0x46, 0xd6, 0x26, 0x9b, 0xfc, 0xea, 0x40, 0xf8, 0xbf, 0xd5, 0xc8, 0x33, 0x41,
-	0xe7, 0x05, 0x71, 0x47, 0x0a, 0xa7, 0x89, 0x91, 0xb7, 0x48, 0x5f, 0xef, 0xc5, 0x14, 0xb3, 0xa7,
-	0x00, 0x69, 0xa1, 0x14, 0xa6, 0x6e, 0xb0, 0xf9, 0xf8, 0x06, 0x71, 0x9a, 0x91, 0x0d, 0x77, 0x76,
-	0xf5, 0x62, 0xdf, 0x91, 0xda, 0xa9, 0xe7, 0xb0, 0x23, 0x50, 0xa1, 0x6d, 0x1b, 0x6a, 0xa7, 0x86,
-	0x35, 0xab, 0x5b, 0x5e, 0x01, 0xab, 0x53, 0x91, 0x2c, 0xaa, 0x75, 0x63, 0x9f, 0x1a, 0x47, 0x4d,
-	0xe5, 0xb8, 0x6a, 0xbb, 0x1f, 0x83, 0xaf, 0x91, 0x8b, 0xa4, 0xc8, 0x55, 0x45, 0xe6, 0x6d, 0xc7,
-	0xdb, 0x0e, 0x9c, 0xe7, 0xaa, 0x62, 0x2f, 0x61, 0x5f, 0x63, 0xa9, 0x64, 0xca, 0x93, 0x52, 0xf1,
-	0x14, 0x33, 0xcc, 0x5b, 0x1f, 0x47, 0x4d, 0xe1, 0xa2, 0xe5, 0x2c, 0x84, 0xc1, 0x0d, 0x6a, 0xe3,
-	0x7e, 0x96, 0x4f, 0x2d, 0x6d, 0xca, 0x46, 0xd0, 0xb5, 0x56, 0x85, 0x40, 0xd4, 0x85, 0x93, 0x01,
-	0x6c, 0x9d, 0x64, 0xa5, 0xad, 0x26, 0x3f, 0x3d, 0xd8, 0x9b, 0x2f, 0x4b, 0xd4, 0xc7, 0xaa, 0x48,
-	0xaf, 0x4f, 0x56, 0x56, 0x73, 0x76, 0x0e, 0xbb, 0xa8, 0xb9, 0x59, 0x6a, 0xb7, 0xbb, 0x90, 0xf9,
-	0x15, 0x49, 0x3a, 0x3c, 0x8a, 0x36, 0xae, 0xc7, 0xbd, 0x99, 0xe9, 0x49, 0x3d, 0x30, 0xa3, 0xfe,
-	0x38, 0xc0, 0xcd, 0xf4, 0xe0, 0x2b, 0x04, 0x7f, 0xd4, 0x9d, 0x31, 0xee, 0xea, 0x36, 0x56, 0x51,
-	0xec, 0x1c, 0x2f, 0xb9, 0x96, 0xb6, 0x6a, 0x9e, 0x58, 0x93, 0x39, 0x43, 0x9a, 0x17, 0x24, 0x85,
-	0x09, 0xbb, 0xe3, 0xae, 0xbb, 0xc4, 0x35, 0x39, 0x15, 0xe6, 0xe8, 0xbb, 0x07, 0x83, 0x79, 0xfd,
-	0xa4, 0xd9, 0x29, 0x04, 0x73, 0xcc, 0xc5, 0xdd, 0x23, 0x7e, 0xb8, 0xb1, 0xf1, 0x9a, 0x1e, 0x1c,
-	0xfe, 0x8b, 0xb6, 0x37, 0x78, 0xf2, 0x20, 0xf2, 0x5e, 0x7b, 0xec, 0x2d, 0x04, 0x67, 0x88, 0xe5,
-	0xac, 0xc8, 0x73, 0x4c, 0x2d, 0x0a, 0x36, 0xda, 0x18, 0x22, 0xe9, 0x0e, 0xfe, 0x22, 0xf5, 0xe8,
-	0xa2, 0x4f, 0xff, 0x2c, 0x6f, 0x7e, 0x07, 0x00, 0x00, 0xff, 0xff, 0x73, 0x2b, 0x68, 0x15, 0x6a,
-	0x04, 0x00, 0x00,
+	// 708 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x09, 0x6e, 0x88, 0x02, 0xff, 0x74, 0x54, 0x41, 0x6f, 0xf3, 0x44,
+	0x10, 0xc5, 0x49, 0xbe, 0x24, 0x9e, 0x7c, 0xc9, 0x97, 0x2e, 0x08, 0xb9, 0xa5, 0x94, 0x60, 0x2e,
+	0x46, 0xa0, 0x08, 0x95, 0x33, 0x97, 0x46, 0x45, 0x54, 0x2d, 0x6a, 0xe5, 0x88, 0x1e, 0xb8, 0x58,
+	0x1b, 0xef, 0xb4, 0x5a, 0x75, 0xbd, 0x36, 0xbb, 0x9b, 0x36, 0xee, 0x85, 0x7f, 0xc3, 0x8d, 0xbf,
+	0xc0, 0x89, 0x1f, 0x86, 0x76, 0xd7, 0x4e, 0x42, 0x28, 0xb7, 0xd9, 0x37, 0x6f, 0xbc, 0xe3, 0xf7,
+	0x66, 0x16, 0xc6, 0x1a, 0xe9, 0x0b, 0x22, 0x9b, 0x57, 0xaa, 0x34, 0x25, 0x09, 0x0b, 0xaa, 0x0d,
+	0xaa, 0xac, 0x5a, 0xc5, 0x7f, 0x76, 0x20, 0xfc, 0x09, 0xa9, 0x32, 0x2b, 0xa4, 0x86, 0x4c, 0xa0,
+	0xc3, 0xab, 0x28, 0x98, 0x05, 0x49, 0x98, 0x76, 0x78, 0x45, 0x08, 0xf4, 0xaa, 0x52, 0x99, 0xa8,
+	0x33, 0x0b, 0x92, 0x71, 0xea, 0x62, 0xf2, 0x39, 0x40, 0xb5, 0x5e, 0x09, 0x9e, 0x67, 0x6b, 0x25,
+	0xa2, 0xae, 0xe3, 0x86, 0x1e, 0xf9, 0x45, 0x09, 0x92, 0xc0, 0xb4, 0xa0, 0x9b, 0xec, 0xb9, 0x14,
+	0xeb, 0x02, 0xb3, 0xbc, 0x5c, 0x4b, 0x13, 0xf5, 0x5c, 0xf9, 0xa4, 0xa0, 0x9b, 0x7b, 0x07, 0x2f,
+	0x2c, 0x4a, 0x66, 0xf0, 0xde, 0x32, 0x1f, 0xb8, 0xc0, 0xec, 0x09, 0xeb, 0xe8, 0xdd, 0x2c, 0x48,
+	0x7a, 0x29, 0x14, 0x74, 0xf3, 0x23, 0x17, 0x78, 0x8d, 0x35, 0xf9, 0x02, 0x46, 0x8c, 0x1a, 0x9a,
+	0xe5, 0x28, 0x0d, 0xaa, 0xa8, 0xef, 0xee, 0x02, 0x0b, 0x2d, 0x1c, 0x62, 0xfb, 0x53, 0x34, 0x7f,
+	0x8a, 0x06, 0x2e, 0xe3, 0x62, 0xdb, 0x1f, 0x65, 0x05, 0x97, 0x99, 0xeb, 0x7c, 0xe8, 0xae, 0x0e,
+	0x1d, 0x72, 0x67, 0xdb, 0xff, 0x01, 0x06, 0xbe, 0x37, 0x1d, 0x85, 0xb3, 0x6e, 0x32, 0x3a, 0xff,
+	0x6a, 0xbe, 0x55, 0x63, 0xee, 0xdb, 0xbb, 0x92, 0x0f, 0xa5, 0x2a, 0xa8, 0xe1, 0xa5, 0xfc, 0x19,
+	0xb5, 0xa6, 0x8f, 0x98, 0xb6, 0x35, 0xb1, 0x86, 0xa3, 0xad, 0x5c, 0x29, 0xea, 0xaa, 0x94, 0x1a,
+	0x49, 0x02, 0x1f, 0x7c, 0x7e, 0xc9, 0x5f, 0xf1, 0x86, 0x17, 0xdc, 0x38, 0x0d, 0x7b, 0xe9, 0x21,
+	0x4c, 0x4e, 0x21, 0xd4, 0x98, 0x2b, 0x34, 0xd7, 0x58, 0x3b, 0x55, 0xc3, 0x74, 0x07, 0x90, 0x4f,
+	0xa1, 0x2f, 0x90, 0x32, 0x54, 0x8d, 0xac, 0xcd, 0x29, 0xfe, 0xbb, 0x03, 0xd1, 0xff, 0xb5, 0xe6,
+	0x3c, 0x63, 0xee, 0xbe, 0x71, 0xda, 0xe1, 0xcc, 0x6a, 0xa2, 0xf9, 0x2b, 0xba, 0xaf, 0xf7, 0x52,
+	0x17, 0x93, 0x33, 0x80, 0xbc, 0x14, 0x02, 0x73, 0x5b, 0xd8, 0x7c, 0x7c, 0x0f, 0xb1, 0x9a, 0x39,
+	0x1b, 0x76, 0x76, 0xf5, 0xd2, 0xd0, 0x22, 0xde, 0xa9, 0x2f, 0xe1, 0x3d, 0x43, 0x81, 0xa6, 0x25,
+	0x78, 0xa7, 0x46, 0x1e, 0xf3, 0x94, 0x6f, 0x81, 0xf8, 0x23, 0xcb, 0x56, 0xf5, 0x96, 0xd8, 0x77,
+	0xc4, 0x69, 0x93, 0xb9, 0xa8, 0x5b, 0xf6, 0x67, 0x10, 0x2a, 0xa4, 0x2c, 0x2b, 0xa5, 0xa8, 0x9d,
+	0x79, 0xc3, 0x74, 0x68, 0x81, 0x5b, 0x29, 0x6a, 0xf2, 0x0d, 0x1c, 0x29, 0xac, 0x04, 0xcf, 0x69,
+	0x56, 0x09, 0x9a, 0x63, 0x81, 0xb2, 0xf5, 0x71, 0xda, 0x24, 0xee, 0x5a, 0x9c, 0x44, 0x30, 0x78,
+	0x46, 0xa5, 0xed, 0x6f, 0x85, 0x8e, 0xd2, 0x1e, 0xc9, 0x14, 0xba, 0xc6, 0x88, 0x08, 0x1c, 0x6a,
+	0xc3, 0x78, 0x00, 0xef, 0x2e, 0x8b, 0xca, 0xd4, 0xf1, 0x5f, 0x01, 0x7c, 0x58, 0xae, 0x2b, 0x54,
+	0x17, 0xa2, 0xcc, 0x9f, 0x2e, 0x37, 0x46, 0x51, 0x72, 0x0b, 0x13, 0x54, 0x54, 0xaf, 0x95, 0xed,
+	0x9d, 0x71, 0xf9, 0xe8, 0x24, 0x1d, 0x9d, 0x27, 0x7b, 0xe3, 0x71, 0x50, 0x33, 0xbf, 0xf4, 0x05,
+	0x0b, 0xc7, 0x4f, 0xc7, 0xb8, 0x7f, 0x3c, 0xf9, 0x15, 0xc6, 0xff, 0xca, 0x5b, 0x63, 0xec, 0xe8,
+	0x36, 0x56, 0xb9, 0xd8, 0x3a, 0x5e, 0x51, 0xc5, 0x4d, 0xdd, 0xac, 0x58, 0x73, 0xb2, 0x86, 0x34,
+	0x1b, 0xc4, 0x99, 0x8e, 0xba, 0xb3, 0xae, 0x1d, 0x62, 0x8f, 0x5c, 0x31, 0x1d, 0x7f, 0x0d, 0x1f,
+	0x2f, 0x04, 0x47, 0x69, 0x6e, 0xb8, 0x36, 0x28, 0x53, 0xfc, 0x6d, 0x8d, 0xda, 0xd8, 0x1b, 0x24,
+	0x2d, 0xb0, 0x59, 0x60, 0x17, 0xc7, 0xbf, 0xc3, 0xc4, 0x8f, 0xce, 0x4d, 0x99, 0xbb, 0xb9, 0xb1,
+	0xc2, 0xd8, 0xcd, 0xf5, 0x24, 0x1b, 0x1e, 0xac, 0x74, 0xe7, 0x70, 0xa5, 0x8f, 0x61, 0x28, 0xf1,
+	0x25, 0x7b, 0xde, 0xb5, 0x32, 0x90, 0xf8, 0x72, 0xcf, 0x99, 0xde, 0x4d, 0x06, 0xf3, 0xe9, 0x9e,
+	0x4b, 0x37, 0x93, 0xc1, 0x2c, 0xe5, 0xfc, 0x8f, 0x00, 0x06, 0x4b, 0xff, 0xfc, 0x90, 0x2b, 0x18,
+	0x2f, 0x51, 0xb2, 0xdd, 0x83, 0xf3, 0xc9, 0x9e, 0xba, 0x5b, 0xf4, 0xe4, 0xf4, 0x2d, 0xb4, 0xdd,
+	0xb6, 0xf8, 0xa3, 0x24, 0xf8, 0x2e, 0x20, 0x77, 0x30, 0xbe, 0x46, 0xac, 0x16, 0xa5, 0x94, 0x98,
+	0x1b, 0x64, 0xe4, 0x6c, 0xaf, 0xe8, 0x0d, 0x71, 0x4e, 0x8e, 0xff, 0xb3, 0xe7, 0xad, 0x22, 0xfe,
+	0x8b, 0xab, 0xbe, 0x7b, 0x1c, 0xbf, 0xff, 0x27, 0x00, 0x00, 0xff, 0xff, 0xfd, 0x83, 0xd9, 0x6b,
+	0x2d, 0x05, 0x00, 0x00,
 }
diff --git a/weed/pb/seaweed.proto b/weed/pb/seaweed.proto
index 6ed580b00..e7b757bd8 100644
--- a/weed/pb/seaweed.proto
+++ b/weed/pb/seaweed.proto
@@ -7,9 +7,7 @@ package master_pb;
 service Seaweed {
     rpc SendHeartbeat (stream Heartbeat) returns (stream HeartbeatResponse) {
     }
-    rpc KeepConnected (stream Empty) returns (stream Empty) {
-    }
-    rpc ListenForTopoChange (stream Empty) returns (stream VolumeLocation) {
+    rpc KeepConnected (stream ClientListenRequest) returns (stream VolumeLocation) {
     }
 }
 
@@ -58,8 +56,13 @@ message SuperBlockExtra {
     ErasureCoding erasure_coding = 1;
 }
 
+message ClientListenRequest {
+    string name = 1;
+}
+
 message VolumeLocation {
     string url = 1;
     string public_url = 2;
-    repeated uint32 vid = 3;
+    repeated uint32 new_vids = 3;
+    repeated uint32 deleted_vids = 4;
 }
diff --git a/weed/server/master_grpc_server.go b/weed/server/master_grpc_server.go
index f24cea619..c12938374 100644
--- a/weed/server/master_grpc_server.go
+++ b/weed/server/master_grpc_server.go
@@ -8,6 +8,7 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
 	"github.com/chrislusf/seaweedfs/weed/topology"
 	"google.golang.org/grpc/peer"
+	"fmt"
 )
 
 func (ms *MasterServer) SendHeartbeat(stream master_pb.Seaweed_SendHeartbeatServer) error {
@@ -16,8 +17,26 @@ func (ms *MasterServer) SendHeartbeat(stream master_pb.Seaweed_SendHeartbeatServ
 
 	defer func() {
 		if dn != nil {
+
 			glog.V(0).Infof("unregister disconnected volume server %s:%d", dn.Ip, dn.Port)
 			t.UnRegisterDataNode(dn)
+
+			message := &master_pb.VolumeLocation{
+				Url:       dn.Url(),
+				PublicUrl: dn.PublicUrl,
+			}
+			for _, v := range dn.GetVolumes() {
+				message.DeletedVids = append(message.DeletedVids, uint32(v.Id))
+			}
+
+			if len(message.DeletedVids) > 0 {
+				ms.clientChansLock.RLock()
+				for _, ch := range ms.clientChans {
+					ch <- message
+				}
+				ms.clientChansLock.RUnlock()
+			}
+
 		}
 	}()
 
@@ -49,7 +68,26 @@ func (ms *MasterServer) SendHeartbeat(stream master_pb.Seaweed_SendHeartbeatServ
 				}
 			}
 
-			t.SyncDataNodeRegistration(heartbeat.Volumes, dn)
+			newVolumes, deletedVolumes := t.SyncDataNodeRegistration(heartbeat.Volumes, dn)
+
+			message := &master_pb.VolumeLocation{
+				Url:       dn.Url(),
+				PublicUrl: dn.PublicUrl,
+			}
+			for _, v := range newVolumes {
+				message.NewVids = append(message.NewVids, uint32(v.Id))
+			}
+			for _, v := range deletedVolumes {
+				message.DeletedVids = append(message.DeletedVids, uint32(v.Id))
+			}
+
+			if len(message.NewVids) > 0 || len(message.DeletedVids) > 0 {
+				ms.clientChansLock.RLock()
+				for _, ch := range ms.clientChans {
+					ch <- message
+				}
+				ms.clientChansLock.RUnlock()
+			}
 
 		} else {
 			return err
@@ -69,13 +107,63 @@ func (ms *MasterServer) SendHeartbeat(stream master_pb.Seaweed_SendHeartbeatServ
 
 // KeepConnected keep a stream gRPC call to the master. Used by filer to know the master is up.
 func (ms *MasterServer) KeepConnected(stream master_pb.Seaweed_KeepConnectedServer) error {
-	for {
-		_, err := stream.Recv()
-		if err != nil {
-			return err
+
+	req, err := stream.Recv()
+	if err != nil {
+		return err
+	}
+
+	// remember client address
+	ctx := stream.Context()
+	// fmt.Printf("FromContext %+v\n", ctx)
+	pr, ok := peer.FromContext(ctx)
+	if !ok {
+		glog.Error("failed to get peer from ctx")
+		return fmt.Errorf("failed to get peer from ctx")
+	}
+	if pr.Addr == net.Addr(nil) {
+		glog.Error("failed to get peer address")
+		return fmt.Errorf("failed to get peer address")
+	}
+
+	clientName := req.Name + pr.Addr.String()
+	glog.V(0).Infof("+ client %v", clientName)
+
+	messageChan := make(chan *master_pb.VolumeLocation)
+	stopChan := make(chan bool)
+
+	ms.clientChansLock.Lock()
+	ms.clientChans[clientName] = messageChan
+	ms.clientChansLock.Unlock()
+
+	defer func() {
+		glog.V(0).Infof("- client %v", clientName)
+		ms.clientChansLock.Lock()
+		delete(ms.clientChans, clientName)
+		ms.clientChansLock.Unlock()
+	}()
+
+	go func() {
+		for {
+			_, err := stream.Recv()
+			if err != nil {
+				glog.V(2).Infof("- client %v: %v", clientName, err)
+				stopChan <- true
+				break
+			}
 		}
-		if err := stream.Send(&master_pb.Empty{}); err != nil {
-			return err
+	}()
+
+	for {
+		select {
+		case message := <-messageChan:
+			if err := stream.Send(message); err != nil {
+				return err
+			}
+		case <-stopChan:
+			return nil
 		}
 	}
+
+	return nil
 }
diff --git a/weed/server/master_server.go b/weed/server/master_server.go
index efa0ae104..5b6bc8509 100644
--- a/weed/server/master_server.go
+++ b/weed/server/master_server.go
@@ -14,6 +14,7 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/topology"
 	"github.com/chrislusf/seaweedfs/weed/util"
 	"github.com/gorilla/mux"
+	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
 )
 
 type MasterServer struct {
@@ -31,6 +32,10 @@ type MasterServer struct {
 	vgLock sync.Mutex
 
 	bounedLeaderChan chan int
+
+	// notifying clients
+	clientChansLock sync.RWMutex
+	clientChans     map[string]chan *master_pb.VolumeLocation
 }
 
 func NewMasterServer(r *mux.Router, port int, metaFolder string,
@@ -54,6 +59,7 @@ func NewMasterServer(r *mux.Router, port int, metaFolder string,
 		pulseSeconds:            pulseSeconds,
 		defaultReplicaPlacement: defaultReplicaPlacement,
 		garbageThreshold:        garbageThreshold,
+		clientChans:             make(map[string]chan *master_pb.VolumeLocation),
 	}
 	ms.bounedLeaderChan = make(chan int, 16)
 	seq := sequence.NewMemorySequencer()
diff --git a/weed/topology/data_node.go b/weed/topology/data_node.go
index 0ef8ae14e..6ee9a8a03 100644
--- a/weed/topology/data_node.go
+++ b/weed/topology/data_node.go
@@ -32,7 +32,7 @@ func (dn *DataNode) String() string {
 	return fmt.Sprintf("Node:%s, volumes:%v, Ip:%s, Port:%d, PublicUrl:%s", dn.NodeImpl.String(), dn.volumes, dn.Ip, dn.Port, dn.PublicUrl)
 }
 
-func (dn *DataNode) AddOrUpdateVolume(v storage.VolumeInfo) {
+func (dn *DataNode) AddOrUpdateVolume(v storage.VolumeInfo) (isNew bool) {
 	dn.Lock()
 	defer dn.Unlock()
 	if _, ok := dn.volumes[v.Id]; !ok {
@@ -42,12 +42,14 @@ func (dn *DataNode) AddOrUpdateVolume(v storage.VolumeInfo) {
 			dn.UpAdjustActiveVolumeCountDelta(1)
 		}
 		dn.UpAdjustMaxVolumeId(v.Id)
+		isNew = true
 	} else {
 		dn.volumes[v.Id] = v
 	}
+	return
 }
 
-func (dn *DataNode) UpdateVolumes(actualVolumes []storage.VolumeInfo) (deletedVolumes []storage.VolumeInfo) {
+func (dn *DataNode) UpdateVolumes(actualVolumes []storage.VolumeInfo) (newVolumes, deletedVolumes []storage.VolumeInfo) {
 	actualVolumeMap := make(map[storage.VolumeId]storage.VolumeInfo)
 	for _, v := range actualVolumes {
 		actualVolumeMap[v.Id] = v
@@ -64,7 +66,10 @@ func (dn *DataNode) UpdateVolumes(actualVolumes []storage.VolumeInfo) (deletedVo
 	}
 	dn.Unlock()
 	for _, v := range actualVolumes {
-		dn.AddOrUpdateVolume(v)
+		isNew := dn.AddOrUpdateVolume(v)
+		if isNew {
+			newVolumes = append(newVolumes, v)
+		}
 	}
 	return
 }
diff --git a/weed/topology/topology.go b/weed/topology/topology.go
index 177c2a181..4242bfa05 100644
--- a/weed/topology/topology.go
+++ b/weed/topology/topology.go
@@ -151,7 +151,7 @@ func (t *Topology) GetOrCreateDataCenter(dcName string) *DataCenter {
 	return dc
 }
 
-func (t *Topology) SyncDataNodeRegistration(volumes []*master_pb.VolumeInformationMessage, dn *DataNode) {
+func (t *Topology) SyncDataNodeRegistration(volumes []*master_pb.VolumeInformationMessage, dn *DataNode) (newVolumes, deletedVolumes []storage.VolumeInfo) {
 	var volumeInfos []storage.VolumeInfo
 	for _, v := range volumes {
 		if vi, err := storage.NewVolumeInfo(v); err == nil {
@@ -160,11 +160,12 @@ func (t *Topology) SyncDataNodeRegistration(volumes []*master_pb.VolumeInformati
 			glog.V(0).Infof("Fail to convert joined volume information: %v", err)
 		}
 	}
-	deletedVolumes := dn.UpdateVolumes(volumeInfos)
+	newVolumes, deletedVolumes = dn.UpdateVolumes(volumeInfos)
 	for _, v := range volumeInfos {
 		t.RegisterVolumeLayout(v, dn)
 	}
 	for _, v := range deletedVolumes {
 		t.UnRegisterVolumeLayout(v, dn)
 	}
+	return
 }