master supports grpc ping

6 files changed, 356 insertions, 132 deletions

diff --git a/weed/pb/master.proto b/weed/pb/master.proto
index 7a257bb28..2ba5b8b63 100644
--- a/weed/pb/master.proto
+++ b/weed/pb/master.proto
@@ -35,7 +35,8 @@ service Seaweed {
   }
   rpc ReleaseAdminToken (ReleaseAdminTokenRequest) returns (ReleaseAdminTokenResponse) {
   }
-
+  rpc Ping (PingRequest) returns (PingResponse) {
+  }
 }
 
 //////////////////////////////////////////////////
@@ -328,3 +329,10 @@ message ReleaseAdminTokenRequest {
 }
 message ReleaseAdminTokenResponse {
 }
+
+message PingRequest {
+  string target = 1; // default to ping itself
+  string target_type = 2;
+}
+message PingResponse {
+}
diff --git a/weed/pb/master_pb/master.pb.go b/weed/pb/master_pb/master.pb.go
index 681534fc3..31db35d22 100644
--- a/weed/pb/master_pb/master.pb.go
+++ b/weed/pb/master_pb/master.pb.go
@@ -2868,6 +2868,99 @@ func (*ReleaseAdminTokenResponse) Descriptor() ([]byte, []int) {
 	return file_master_proto_rawDescGZIP(), []int{42}
 }
 
+type PingRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Target     string `protobuf:"bytes,1,opt,name=target,proto3" json:"target,omitempty"` // default to ping itself
+	TargetType string `protobuf:"bytes,2,opt,name=target_type,json=targetType,proto3" json:"target_type,omitempty"`
+}
+
+func (x *PingRequest) Reset() {
+	*x = PingRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_master_proto_msgTypes[43]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *PingRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*PingRequest) ProtoMessage() {}
+
+func (x *PingRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_master_proto_msgTypes[43]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use PingRequest.ProtoReflect.Descriptor instead.
+func (*PingRequest) Descriptor() ([]byte, []int) {
+	return file_master_proto_rawDescGZIP(), []int{43}
+}
+
+func (x *PingRequest) GetTarget() string {
+	if x != nil {
+		return x.Target
+	}
+	return ""
+}
+
+func (x *PingRequest) GetTargetType() string {
+	if x != nil {
+		return x.TargetType
+	}
+	return ""
+}
+
+type PingResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+}
+
+func (x *PingResponse) Reset() {
+	*x = PingResponse{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_master_proto_msgTypes[44]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *PingResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*PingResponse) ProtoMessage() {}
+
+func (x *PingResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_master_proto_msgTypes[44]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use PingResponse.ProtoReflect.Descriptor instead.
+func (*PingResponse) Descriptor() ([]byte, []int) {
+	return file_master_proto_rawDescGZIP(), []int{44}
+}
+
 type SuperBlockExtra_ErasureCoding struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -2881,7 +2974,7 @@ type SuperBlockExtra_ErasureCoding struct {
 func (x *SuperBlockExtra_ErasureCoding) Reset() {
 	*x = SuperBlockExtra_ErasureCoding{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_master_proto_msgTypes[45]
+		mi := &file_master_proto_msgTypes[47]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2894,7 +2987,7 @@ func (x *SuperBlockExtra_ErasureCoding) String() string {
 func (*SuperBlockExtra_ErasureCoding) ProtoMessage() {}
 
 func (x *SuperBlockExtra_ErasureCoding) ProtoReflect() protoreflect.Message {
-	mi := &file_master_proto_msgTypes[45]
+	mi := &file_master_proto_msgTypes[47]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2945,7 +3038,7 @@ type LookupVolumeResponse_VolumeIdLocation struct {
 func (x *LookupVolumeResponse_VolumeIdLocation) Reset() {
 	*x = LookupVolumeResponse_VolumeIdLocation{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_master_proto_msgTypes[46]
+		mi := &file_master_proto_msgTypes[48]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2958,7 +3051,7 @@ func (x *LookupVolumeResponse_VolumeIdLocation) String() string {
 func (*LookupVolumeResponse_VolumeIdLocation) ProtoMessage() {}
 
 func (x *LookupVolumeResponse_VolumeIdLocation) ProtoReflect() protoreflect.Message {
-	mi := &file_master_proto_msgTypes[46]
+	mi := &file_master_proto_msgTypes[48]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -3014,7 +3107,7 @@ type LookupEcVolumeResponse_EcShardIdLocation struct {
 func (x *LookupEcVolumeResponse_EcShardIdLocation) Reset() {
 	*x = LookupEcVolumeResponse_EcShardIdLocation{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_master_proto_msgTypes[51]
+		mi := &file_master_proto_msgTypes[53]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -3027,7 +3120,7 @@ func (x *LookupEcVolumeResponse_EcShardIdLocation) String() string {
 func (*LookupEcVolumeResponse_EcShardIdLocation) ProtoMessage() {}
 
 func (x *LookupEcVolumeResponse_EcShardIdLocation) ProtoReflect() protoreflect.Message {
-	mi := &file_master_proto_msgTypes[51]
+	mi := &file_master_proto_msgTypes[53]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -3070,7 +3163,7 @@ type ListClusterNodesResponse_ClusterNode struct {
 func (x *ListClusterNodesResponse_ClusterNode) Reset() {
 	*x = ListClusterNodesResponse_ClusterNode{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_master_proto_msgTypes[52]
+		mi := &file_master_proto_msgTypes[54]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -3083,7 +3176,7 @@ func (x *ListClusterNodesResponse_ClusterNode) String() string {
 func (*ListClusterNodesResponse_ClusterNode) ProtoMessage() {}
 
 func (x *ListClusterNodesResponse_ClusterNode) ProtoReflect() protoreflect.Message {
-	mi := &file_master_proto_msgTypes[52]
+	mi := &file_master_proto_msgTypes[54]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -3607,87 +3700,97 @@ var file_master_proto_rawDesc = []byte{
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 }
 
 var (
@@ -3702,7 +3805,7 @@ func file_master_proto_rawDescGZIP() []byte {
 	return file_master_proto_rawDescData
 }
 
-var file_master_proto_msgTypes = make([]protoimpl.MessageInfo, 53)
+var file_master_proto_msgTypes = make([]protoimpl.MessageInfo, 55)
 var file_master_proto_goTypes = []interface{}{
 	(*Heartbeat)(nil),                             // 0: master_pb.Heartbeat
 	(*HeartbeatResponse)(nil),                     // 1: master_pb.HeartbeatResponse
@@ -3747,16 +3850,18 @@ var file_master_proto_goTypes = []interface{}{
 	(*LeaseAdminTokenResponse)(nil),               // 40: master_pb.LeaseAdminTokenResponse
 	(*ReleaseAdminTokenRequest)(nil),              // 41: master_pb.ReleaseAdminTokenRequest
 	(*ReleaseAdminTokenResponse)(nil),             // 42: master_pb.ReleaseAdminTokenResponse
-	nil,                                           // 43: master_pb.Heartbeat.MaxVolumeCountsEntry
-	nil,                                           // 44: master_pb.StorageBackend.PropertiesEntry
-	(*SuperBlockExtra_ErasureCoding)(nil),         // 45: master_pb.SuperBlockExtra.ErasureCoding
-	(*LookupVolumeResponse_VolumeIdLocation)(nil), // 46: master_pb.LookupVolumeResponse.VolumeIdLocation
-	nil, // 47: master_pb.DataNodeInfo.DiskInfosEntry
-	nil, // 48: master_pb.RackInfo.DiskInfosEntry
-	nil, // 49: master_pb.DataCenterInfo.DiskInfosEntry
-	nil, // 50: master_pb.TopologyInfo.DiskInfosEntry
-	(*LookupEcVolumeResponse_EcShardIdLocation)(nil), // 51: master_pb.LookupEcVolumeResponse.EcShardIdLocation
-	(*ListClusterNodesResponse_ClusterNode)(nil),     // 52: master_pb.ListClusterNodesResponse.ClusterNode
+	(*PingRequest)(nil),                           // 43: master_pb.PingRequest
+	(*PingResponse)(nil),                          // 44: master_pb.PingResponse
+	nil,                                           // 45: master_pb.Heartbeat.MaxVolumeCountsEntry
+	nil,                                           // 46: master_pb.StorageBackend.PropertiesEntry
+	(*SuperBlockExtra_ErasureCoding)(nil),         // 47: master_pb.SuperBlockExtra.ErasureCoding
+	(*LookupVolumeResponse_VolumeIdLocation)(nil), // 48: master_pb.LookupVolumeResponse.VolumeIdLocation
+	nil, // 49: master_pb.DataNodeInfo.DiskInfosEntry
+	nil, // 50: master_pb.RackInfo.DiskInfosEntry
+	nil, // 51: master_pb.DataCenterInfo.DiskInfosEntry
+	nil, // 52: master_pb.TopologyInfo.DiskInfosEntry
+	(*LookupEcVolumeResponse_EcShardIdLocation)(nil), // 53: master_pb.LookupEcVolumeResponse.EcShardIdLocation
+	(*ListClusterNodesResponse_ClusterNode)(nil),     // 54: master_pb.ListClusterNodesResponse.ClusterNode
 }
 var file_master_proto_depIdxs = []int32{
 	2,  // 0: master_pb.Heartbeat.volumes:type_name -> master_pb.VolumeInformationMessage
@@ -3765,29 +3870,29 @@ var file_master_proto_depIdxs = []int32{
 	4,  // 3: master_pb.Heartbeat.ec_shards:type_name -> master_pb.VolumeEcShardInformationMessage
 	4,  // 4: master_pb.Heartbeat.new_ec_shards:type_name -> master_pb.VolumeEcShardInformationMessage
 	4,  // 5: master_pb.Heartbeat.deleted_ec_shards:type_name -> master_pb.VolumeEcShardInformationMessage
-	43, // 6: master_pb.Heartbeat.max_volume_counts:type_name -> master_pb.Heartbeat.MaxVolumeCountsEntry
+	45, // 6: master_pb.Heartbeat.max_volume_counts:type_name -> master_pb.Heartbeat.MaxVolumeCountsEntry
 	5,  // 7: master_pb.HeartbeatResponse.storage_backends:type_name -> master_pb.StorageBackend
-	44, // 8: master_pb.StorageBackend.properties:type_name -> master_pb.StorageBackend.PropertiesEntry
-	45, // 9: master_pb.SuperBlockExtra.erasure_coding:type_name -> master_pb.SuperBlockExtra.ErasureCoding
+	46, // 8: master_pb.StorageBackend.properties:type_name -> master_pb.StorageBackend.PropertiesEntry
+	47, // 9: master_pb.SuperBlockExtra.erasure_coding:type_name -> master_pb.SuperBlockExtra.ErasureCoding
 	9,  // 10: master_pb.KeepConnectedResponse.volume_location:type_name -> master_pb.VolumeLocation
 	10, // 11: master_pb.KeepConnectedResponse.cluster_node_update:type_name -> master_pb.ClusterNodeUpdate
-	46, // 12: master_pb.LookupVolumeResponse.volume_id_locations:type_name -> master_pb.LookupVolumeResponse.VolumeIdLocation
+	48, // 12: master_pb.LookupVolumeResponse.volume_id_locations:type_name -> master_pb.LookupVolumeResponse.VolumeIdLocation
 	14, // 13: master_pb.AssignResponse.replicas:type_name -> master_pb.Location
 	14, // 14: master_pb.AssignResponse.location:type_name -> master_pb.Location
 	19, // 15: master_pb.CollectionListResponse.collections:type_name -> master_pb.Collection
 	2,  // 16: master_pb.DiskInfo.volume_infos:type_name -> master_pb.VolumeInformationMessage
 	4,  // 17: master_pb.DiskInfo.ec_shard_infos:type_name -> master_pb.VolumeEcShardInformationMessage
-	47, // 18: master_pb.DataNodeInfo.diskInfos:type_name -> master_pb.DataNodeInfo.DiskInfosEntry
+	49, // 18: master_pb.DataNodeInfo.diskInfos:type_name -> master_pb.DataNodeInfo.DiskInfosEntry
 	25, // 19: master_pb.RackInfo.data_node_infos:type_name -> master_pb.DataNodeInfo
-	48, // 20: master_pb.RackInfo.diskInfos:type_name -> master_pb.RackInfo.DiskInfosEntry
+	50, // 20: master_pb.RackInfo.diskInfos:type_name -> master_pb.RackInfo.DiskInfosEntry
 	26, // 21: master_pb.DataCenterInfo.rack_infos:type_name -> master_pb.RackInfo
-	49, // 22: master_pb.DataCenterInfo.diskInfos:type_name -> master_pb.DataCenterInfo.DiskInfosEntry
+	51, // 22: master_pb.DataCenterInfo.diskInfos:type_name -> master_pb.DataCenterInfo.DiskInfosEntry
 	27, // 23: master_pb.TopologyInfo.data_center_infos:type_name -> master_pb.DataCenterInfo
-	50, // 24: master_pb.TopologyInfo.diskInfos:type_name -> master_pb.TopologyInfo.DiskInfosEntry
+	52, // 24: master_pb.TopologyInfo.diskInfos:type_name -> master_pb.TopologyInfo.DiskInfosEntry
 	28, // 25: master_pb.VolumeListResponse.topology_info:type_name -> master_pb.TopologyInfo
-	51, // 26: master_pb.LookupEcVolumeResponse.shard_id_locations:type_name -> master_pb.LookupEcVolumeResponse.EcShardIdLocation
+	53, // 26: master_pb.LookupEcVolumeResponse.shard_id_locations:type_name -> master_pb.LookupEcVolumeResponse.EcShardIdLocation
 	5,  // 27: master_pb.GetMasterConfigurationResponse.storage_backends:type_name -> master_pb.StorageBackend
-	52, // 28: master_pb.ListClusterNodesResponse.cluster_nodes:type_name -> master_pb.ListClusterNodesResponse.ClusterNode
+	54, // 28: master_pb.ListClusterNodesResponse.cluster_nodes:type_name -> master_pb.ListClusterNodesResponse.ClusterNode
 	14, // 29: master_pb.LookupVolumeResponse.VolumeIdLocation.locations:type_name -> master_pb.Location
 	24, // 30: master_pb.DataNodeInfo.DiskInfosEntry.value:type_name -> master_pb.DiskInfo
 	24, // 31: master_pb.RackInfo.DiskInfosEntry.value:type_name -> master_pb.DiskInfo
@@ -3808,22 +3913,24 @@ var file_master_proto_depIdxs = []int32{
 	37, // 46: master_pb.Seaweed.ListClusterNodes:input_type -> master_pb.ListClusterNodesRequest
 	39, // 47: master_pb.Seaweed.LeaseAdminToken:input_type -> master_pb.LeaseAdminTokenRequest
 	41, // 48: master_pb.Seaweed.ReleaseAdminToken:input_type -> master_pb.ReleaseAdminTokenRequest
-	1,  // 49: master_pb.Seaweed.SendHeartbeat:output_type -> master_pb.HeartbeatResponse
-	11, // 50: master_pb.Seaweed.KeepConnected:output_type -> master_pb.KeepConnectedResponse
-	13, // 51: master_pb.Seaweed.LookupVolume:output_type -> master_pb.LookupVolumeResponse
-	16, // 52: master_pb.Seaweed.Assign:output_type -> master_pb.AssignResponse
-	18, // 53: master_pb.Seaweed.Statistics:output_type -> master_pb.StatisticsResponse
-	21, // 54: master_pb.Seaweed.CollectionList:output_type -> master_pb.CollectionListResponse
-	23, // 55: master_pb.Seaweed.CollectionDelete:output_type -> master_pb.CollectionDeleteResponse
-	30, // 56: master_pb.Seaweed.VolumeList:output_type -> master_pb.VolumeListResponse
-	32, // 57: master_pb.Seaweed.LookupEcVolume:output_type -> master_pb.LookupEcVolumeResponse
-	34, // 58: master_pb.Seaweed.VacuumVolume:output_type -> master_pb.VacuumVolumeResponse
-	36, // 59: master_pb.Seaweed.GetMasterConfiguration:output_type -> master_pb.GetMasterConfigurationResponse
-	38, // 60: master_pb.Seaweed.ListClusterNodes:output_type -> master_pb.ListClusterNodesResponse
-	40, // 61: master_pb.Seaweed.LeaseAdminToken:output_type -> master_pb.LeaseAdminTokenResponse
-	42, // 62: master_pb.Seaweed.ReleaseAdminToken:output_type -> master_pb.ReleaseAdminTokenResponse
-	49, // [49:63] is the sub-list for method output_type
-	35, // [35:49] is the sub-list for method input_type
+	43, // 49: master_pb.Seaweed.Ping:input_type -> master_pb.PingRequest
+	1,  // 50: master_pb.Seaweed.SendHeartbeat:output_type -> master_pb.HeartbeatResponse
+	11, // 51: master_pb.Seaweed.KeepConnected:output_type -> master_pb.KeepConnectedResponse
+	13, // 52: master_pb.Seaweed.LookupVolume:output_type -> master_pb.LookupVolumeResponse
+	16, // 53: master_pb.Seaweed.Assign:output_type -> master_pb.AssignResponse
+	18, // 54: master_pb.Seaweed.Statistics:output_type -> master_pb.StatisticsResponse
+	21, // 55: master_pb.Seaweed.CollectionList:output_type -> master_pb.CollectionListResponse
+	23, // 56: master_pb.Seaweed.CollectionDelete:output_type -> master_pb.CollectionDeleteResponse
+	30, // 57: master_pb.Seaweed.VolumeList:output_type -> master_pb.VolumeListResponse
+	32, // 58: master_pb.Seaweed.LookupEcVolume:output_type -> master_pb.LookupEcVolumeResponse
+	34, // 59: master_pb.Seaweed.VacuumVolume:output_type -> master_pb.VacuumVolumeResponse
+	36, // 60: master_pb.Seaweed.GetMasterConfiguration:output_type -> master_pb.GetMasterConfigurationResponse
+	38, // 61: master_pb.Seaweed.ListClusterNodes:output_type -> master_pb.ListClusterNodesResponse
+	40, // 62: master_pb.Seaweed.LeaseAdminToken:output_type -> master_pb.LeaseAdminTokenResponse
+	42, // 63: master_pb.Seaweed.ReleaseAdminToken:output_type -> master_pb.ReleaseAdminTokenResponse
+	44, // 64: master_pb.Seaweed.Ping:output_type -> master_pb.PingResponse
+	50, // [50:65] is the sub-list for method output_type
+	35, // [35:50] is the sub-list for method input_type
 	35, // [35:35] is the sub-list for extension type_name
 	35, // [35:35] is the sub-list for extension extendee
 	0,  // [0:35] is the sub-list for field type_name
@@ -4351,7 +4458,31 @@ func file_master_proto_init() {
 				return nil
 			}
 		}
-		file_master_proto_msgTypes[45].Exporter = func(v interface{}, i int) interface{} {
+		file_master_proto_msgTypes[43].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*PingRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_master_proto_msgTypes[44].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*PingResponse); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_master_proto_msgTypes[47].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*SuperBlockExtra_ErasureCoding); i {
 			case 0:
 				return &v.state
@@ -4363,7 +4494,7 @@ func file_master_proto_init() {
 				return nil
 			}
 		}
-		file_master_proto_msgTypes[46].Exporter = func(v interface{}, i int) interface{} {
+		file_master_proto_msgTypes[48].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*LookupVolumeResponse_VolumeIdLocation); i {
 			case 0:
 				return &v.state
@@ -4375,7 +4506,7 @@ func file_master_proto_init() {
 				return nil
 			}
 		}
-		file_master_proto_msgTypes[51].Exporter = func(v interface{}, i int) interface{} {
+		file_master_proto_msgTypes[53].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*LookupEcVolumeResponse_EcShardIdLocation); i {
 			case 0:
 				return &v.state
@@ -4387,7 +4518,7 @@ func file_master_proto_init() {
 				return nil
 			}
 		}
-		file_master_proto_msgTypes[52].Exporter = func(v interface{}, i int) interface{} {
+		file_master_proto_msgTypes[54].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*ListClusterNodesResponse_ClusterNode); i {
 			case 0:
 				return &v.state
@@ -4406,7 +4537,7 @@ func file_master_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_master_proto_rawDesc,
 			NumEnums:      0,
-			NumMessages:   53,
+			NumMessages:   55,
 			NumExtensions: 0,
 			NumServices:   1,
 		},
diff --git a/weed/pb/master_pb/master_grpc.pb.go b/weed/pb/master_pb/master_grpc.pb.go
index 7046afec6..56057d555 100644
--- a/weed/pb/master_pb/master_grpc.pb.go
+++ b/weed/pb/master_pb/master_grpc.pb.go
@@ -32,6 +32,7 @@ type SeaweedClient interface {
 	ListClusterNodes(ctx context.Context, in *ListClusterNodesRequest, opts ...grpc.CallOption) (*ListClusterNodesResponse, error)
 	LeaseAdminToken(ctx context.Context, in *LeaseAdminTokenRequest, opts ...grpc.CallOption) (*LeaseAdminTokenResponse, error)
 	ReleaseAdminToken(ctx context.Context, in *ReleaseAdminTokenRequest, opts ...grpc.CallOption) (*ReleaseAdminTokenResponse, error)
+	Ping(ctx context.Context, in *PingRequest, opts ...grpc.CallOption) (*PingResponse, error)
 }
 
 type seaweedClient struct {
@@ -212,6 +213,15 @@ func (c *seaweedClient) ReleaseAdminToken(ctx context.Context, in *ReleaseAdminT
 	return out, nil
 }
 
+func (c *seaweedClient) Ping(ctx context.Context, in *PingRequest, opts ...grpc.CallOption) (*PingResponse, error) {
+	out := new(PingResponse)
+	err := c.cc.Invoke(ctx, "/master_pb.Seaweed/Ping", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 // SeaweedServer is the server API for Seaweed service.
 // All implementations must embed UnimplementedSeaweedServer
 // for forward compatibility
@@ -230,6 +240,7 @@ type SeaweedServer interface {
 	ListClusterNodes(context.Context, *ListClusterNodesRequest) (*ListClusterNodesResponse, error)
 	LeaseAdminToken(context.Context, *LeaseAdminTokenRequest) (*LeaseAdminTokenResponse, error)
 	ReleaseAdminToken(context.Context, *ReleaseAdminTokenRequest) (*ReleaseAdminTokenResponse, error)
+	Ping(context.Context, *PingRequest) (*PingResponse, error)
 	mustEmbedUnimplementedSeaweedServer()
 }
 
@@ -279,6 +290,9 @@ func (UnimplementedSeaweedServer) LeaseAdminToken(context.Context, *LeaseAdminTo
 func (UnimplementedSeaweedServer) ReleaseAdminToken(context.Context, *ReleaseAdminTokenRequest) (*ReleaseAdminTokenResponse, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method ReleaseAdminToken not implemented")
 }
+func (UnimplementedSeaweedServer) Ping(context.Context, *PingRequest) (*PingResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method Ping not implemented")
+}
 func (UnimplementedSeaweedServer) mustEmbedUnimplementedSeaweedServer() {}
 
 // UnsafeSeaweedServer may be embedded to opt out of forward compatibility for this service.
@@ -560,6 +574,24 @@ func _Seaweed_ReleaseAdminToken_Handler(srv interface{}, ctx context.Context, de
 	return interceptor(ctx, in, info, handler)
 }
 
+func _Seaweed_Ping_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(PingRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(SeaweedServer).Ping(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/master_pb.Seaweed/Ping",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(SeaweedServer).Ping(ctx, req.(*PingRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 // Seaweed_ServiceDesc is the grpc.ServiceDesc for Seaweed service.
 // It's only intended for direct use with grpc.RegisterService,
 // and not to be introspected or modified (even as a copy)
@@ -615,6 +647,10 @@ var Seaweed_ServiceDesc = grpc.ServiceDesc{
 			MethodName: "ReleaseAdminToken",
 			Handler:    _Seaweed_ReleaseAdminToken_Handler,
 		},
+		{
+			MethodName: "Ping",
+			Handler:    _Seaweed_Ping_Handler,
+		},
 	},
 	Streams: []grpc.StreamDesc{
 		{
diff --git a/weed/server/filer_grpc_server_admin.go b/weed/server/filer_grpc_server_admin.go
index c9ecfe467..ee3394a77 100644
--- a/weed/server/filer_grpc_server_admin.go
+++ b/weed/server/filer_grpc_server_admin.go
@@ -2,6 +2,7 @@ package weed_server
 
 import (
 	"context"
+	"fmt"
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/pb"
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
@@ -54,6 +55,15 @@ func (fs *FilerServer) Ping(ctx context.Context, req *filer_pb.PingRequest) (res
 			return err
 		})
 	}
+	if req.TargetType == "Master" {
+		pingErr = pb.WithMasterClient(false, pb.ServerAddress(req.Target), fs.grpcDialOption, func(client master_pb.SeaweedClient) error {
+			_, err := client.Ping(ctx, &master_pb.PingRequest{})
+			return err
+		})
+	}
+	if pingErr != nil {
+		pingErr = fmt.Errorf("ping %s %s: %v", req.TargetType, req.Target, pingErr)
+	}
 	return
 }
 
diff --git a/weed/server/master_grpc_server_admin.go b/weed/server/master_grpc_server_admin.go
index 983606476..0649ea73e 100644
--- a/weed/server/master_grpc_server_admin.go
+++ b/weed/server/master_grpc_server_admin.go
@@ -4,6 +4,9 @@ import (
 	"context"
 	"fmt"
 	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/volume_server_pb"
 	"math/rand"
 	"sync"
 	"time"
@@ -142,3 +145,29 @@ func (ms *MasterServer) ReleaseAdminToken(ctx context.Context, req *master_pb.Re
 	}
 	return resp, nil
 }
+
+func (ms *MasterServer) Ping(ctx context.Context, req *master_pb.PingRequest) (resp *master_pb.PingResponse, pingErr error) {
+	resp = &master_pb.PingResponse{}
+	if req.TargetType == "Filer" {
+		pingErr = pb.WithFilerClient(false, pb.ServerAddress(req.Target), ms.grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
+			_, err := client.Ping(ctx, &filer_pb.PingRequest{})
+			return err
+		})
+	}
+	if req.TargetType == "VolumeServer" {
+		pingErr = pb.WithVolumeServerClient(false, pb.ServerAddress(req.Target), ms.grpcDialOption, func(client volume_server_pb.VolumeServerClient) error {
+			_, err := client.Ping(ctx, &volume_server_pb.PingRequest{})
+			return err
+		})
+	}
+	if req.TargetType == "Master" {
+		pingErr = pb.WithMasterClient(false, pb.ServerAddress(req.Target), ms.grpcDialOption, func(client master_pb.SeaweedClient) error {
+			_, err := client.Ping(ctx, &master_pb.PingRequest{})
+			return err
+		})
+	}
+	if pingErr != nil {
+		pingErr = fmt.Errorf("ping %s %s: %v", req.TargetType, req.Target, pingErr)
+	}
+	return
+}
diff --git a/weed/server/volume_grpc_admin.go b/weed/server/volume_grpc_admin.go
index cd01698bc..a6617bfe1 100644
--- a/weed/server/volume_grpc_admin.go
+++ b/weed/server/volume_grpc_admin.go
@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"github.com/chrislusf/seaweedfs/weed/pb"
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
 	"path/filepath"
 
 	"github.com/chrislusf/seaweedfs/weed/glog"
@@ -264,5 +265,14 @@ func (vs *VolumeServer) Ping(ctx context.Context, req *volume_server_pb.PingRequ
 			return err
 		})
 	}
+	if req.TargetType == "Master" {
+		pingErr = pb.WithMasterClient(false, pb.ServerAddress(req.Target), vs.grpcDialOption, func(client master_pb.SeaweedClient) error {
+			_, err := client.Ping(ctx, &master_pb.PingRequest{})
+			return err
+		})
+	}
+	if pingErr != nil {
+		pingErr = fmt.Errorf("ping %s %s: %v", req.TargetType, req.Target, pingErr)
+	}
 	return
 }