diff --git a/go/greptime/v1/meta/common.pb.go b/go/greptime/v1/meta/common.pb.go
index 361f338..778faa2 100644
--- a/go/greptime/v1/meta/common.pb.go
+++ b/go/greptime/v1/meta/common.pb.go
@@ -20,6 +20,52 @@ const (
 	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
 )
 
+type Role int32
+
+const (
+	Role_DATANODE Role = 0
+	Role_FRONTEND Role = 1
+)
+
+// Enum value maps for Role.
+var (
+	Role_name = map[int32]string{
+		0: "DATANODE",
+		1: "FRONTEND",
+	}
+	Role_value = map[string]int32{
+		"DATANODE": 0,
+		"FRONTEND": 1,
+	}
+)
+
+func (x Role) Enum() *Role {
+	p := new(Role)
+	*p = x
+	return p
+}
+
+func (x Role) String() string {
+	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
+}
+
+func (Role) Descriptor() protoreflect.EnumDescriptor {
+	return file_greptime_v1_meta_common_proto_enumTypes[0].Descriptor()
+}
+
+func (Role) Type() protoreflect.EnumType {
+	return &file_greptime_v1_meta_common_proto_enumTypes[0]
+}
+
+func (x Role) Number() protoreflect.EnumNumber {
+	return protoreflect.EnumNumber(x)
+}
+
+// Deprecated: Use Role.Descriptor instead.
+func (Role) EnumDescriptor() ([]byte, []int) {
+	return file_greptime_v1_meta_common_proto_rawDescGZIP(), []int{0}
+}
+
 type RequestHeader struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -30,6 +76,7 @@ type RequestHeader struct {
 	ClusterId uint64 `protobuf:"varint,2,opt,name=cluster_id,json=clusterId,proto3" json:"cluster_id,omitempty"`
 	// member_id is the ID of the sender server.
 	MemberId uint64 `protobuf:"varint,3,opt,name=member_id,json=memberId,proto3" json:"member_id,omitempty"`
+	Role     Role   `protobuf:"varint,4,opt,name=role,proto3,enum=greptime.v1.meta.Role" json:"role,omitempty"`
 }
 
 func (x *RequestHeader) Reset() {
@@ -85,6 +132,13 @@ func (x *RequestHeader) GetMemberId() uint64 {
 	return 0
 }
 
+func (x *RequestHeader) GetRole() Role {
+	if x != nil {
+		return x.Role
+	}
+	return Role_DATANODE
+}
+
 type ResponseHeader struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -328,9 +382,9 @@ type TimeInterval struct {
 	unknownFields protoimpl.UnknownFields
 
 	// The unix timestamp in millis of the start of this period.
-	StartTimestampMillis uint64 `protobuf:"varint,1,opt,name=start_timestamp_millis,json=startTimestampMillis,proto3" json:"start_timestamp_millis,omitempty"`
+	StartTimestampMillis int64 `protobuf:"varint,1,opt,name=start_timestamp_millis,json=startTimestampMillis,proto3" json:"start_timestamp_millis,omitempty"`
 	// The unix timestamp in millis of the end of this period.
-	EndTimestampMillis uint64 `protobuf:"varint,2,opt,name=end_timestamp_millis,json=endTimestampMillis,proto3" json:"end_timestamp_millis,omitempty"`
+	EndTimestampMillis int64 `protobuf:"varint,2,opt,name=end_timestamp_millis,json=endTimestampMillis,proto3" json:"end_timestamp_millis,omitempty"`
 }
 
 func (x *TimeInterval) Reset() {
@@ -365,14 +419,14 @@ func (*TimeInterval) Descriptor() ([]byte, []int) {
 	return file_greptime_v1_meta_common_proto_rawDescGZIP(), []int{5}
 }
 
-func (x *TimeInterval) GetStartTimestampMillis() uint64 {
+func (x *TimeInterval) GetStartTimestampMillis() int64 {
 	if x != nil {
 		return x.StartTimestampMillis
 	}
 	return 0
 }
 
-func (x *TimeInterval) GetEndTimestampMillis() uint64 {
+func (x *TimeInterval) GetEndTimestampMillis() int64 {
 	if x != nil {
 		return x.EndTimestampMillis
 	}
@@ -442,51 +496,56 @@ var file_greptime_v1_meta_common_proto_rawDesc = []byte{
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+	0x74, 0x61, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
@@ -501,23 +560,26 @@ func file_greptime_v1_meta_common_proto_rawDescGZIP() []byte {
 	return file_greptime_v1_meta_common_proto_rawDescData
 }
 
+var file_greptime_v1_meta_common_proto_enumTypes = make([]protoimpl.EnumInfo, 1)
 var file_greptime_v1_meta_common_proto_msgTypes = make([]protoimpl.MessageInfo, 7)
 var file_greptime_v1_meta_common_proto_goTypes = []interface{}{
-	(*RequestHeader)(nil),  // 0: greptime.v1.meta.RequestHeader
-	(*ResponseHeader)(nil), // 1: greptime.v1.meta.ResponseHeader
-	(*Error)(nil),          // 2: greptime.v1.meta.Error
-	(*Peer)(nil),           // 3: greptime.v1.meta.Peer
-	(*TableName)(nil),      // 4: greptime.v1.meta.TableName
-	(*TimeInterval)(nil),   // 5: greptime.v1.meta.TimeInterval
-	(*KeyValue)(nil),       // 6: greptime.v1.meta.KeyValue
+	(Role)(0),              // 0: greptime.v1.meta.Role
+	(*RequestHeader)(nil),  // 1: greptime.v1.meta.RequestHeader
+	(*ResponseHeader)(nil), // 2: greptime.v1.meta.ResponseHeader
+	(*Error)(nil),          // 3: greptime.v1.meta.Error
+	(*Peer)(nil),           // 4: greptime.v1.meta.Peer
+	(*TableName)(nil),      // 5: greptime.v1.meta.TableName
+	(*TimeInterval)(nil),   // 6: greptime.v1.meta.TimeInterval
+	(*KeyValue)(nil),       // 7: greptime.v1.meta.KeyValue
 }
 var file_greptime_v1_meta_common_proto_depIdxs = []int32{
-	2, // 0: greptime.v1.meta.ResponseHeader.error:type_name -> greptime.v1.meta.Error
-	1, // [1:1] is the sub-list for method output_type
-	1, // [1:1] is the sub-list for method input_type
-	1, // [1:1] is the sub-list for extension type_name
-	1, // [1:1] is the sub-list for extension extendee
-	0, // [0:1] is the sub-list for field type_name
+	0, // 0: greptime.v1.meta.RequestHeader.role:type_name -> greptime.v1.meta.Role
+	3, // 1: greptime.v1.meta.ResponseHeader.error:type_name -> greptime.v1.meta.Error
+	2, // [2:2] is the sub-list for method output_type
+	2, // [2:2] is the sub-list for method input_type
+	2, // [2:2] is the sub-list for extension type_name
+	2, // [2:2] is the sub-list for extension extendee
+	0, // [0:2] is the sub-list for field type_name
 }
 
 func init() { file_greptime_v1_meta_common_proto_init() }
@@ -616,13 +678,14 @@ func file_greptime_v1_meta_common_proto_init() {
 		File: protoimpl.DescBuilder{
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_greptime_v1_meta_common_proto_rawDesc,
-			NumEnums:      0,
+			NumEnums:      1,
 			NumMessages:   7,
 			NumExtensions: 0,
 			NumServices:   0,
 		},
 		GoTypes:           file_greptime_v1_meta_common_proto_goTypes,
 		DependencyIndexes: file_greptime_v1_meta_common_proto_depIdxs,
+		EnumInfos:         file_greptime_v1_meta_common_proto_enumTypes,
 		MessageInfos:      file_greptime_v1_meta_common_proto_msgTypes,
 	}.Build()
 	File_greptime_v1_meta_common_proto = out.File
diff --git a/go/greptime/v1/meta/heartbeat.pb.go b/go/greptime/v1/meta/heartbeat.pb.go
index 51713ff..4c1dea9 100644
--- a/go/greptime/v1/meta/heartbeat.pb.go
+++ b/go/greptime/v1/meta/heartbeat.pb.go
@@ -37,7 +37,8 @@ type HeartbeatRequest struct {
 	// Region stats on this node
 	RegionStats []*RegionStat `protobuf:"bytes,6,rep,name=region_stats,json=regionStats,proto3" json:"region_stats,omitempty"`
 	// Follower nodes and stats, empty on follower nodes
-	ReplicaStats []*ReplicaStat `protobuf:"bytes,7,rep,name=replica_stats,json=replicaStats,proto3" json:"replica_stats,omitempty"`
+	ReplicaStats    []*ReplicaStat    `protobuf:"bytes,7,rep,name=replica_stats,json=replicaStats,proto3" json:"replica_stats,omitempty"`
+	MailboxMessages []*MailboxMessage `protobuf:"bytes,8,rep,name=mailbox_messages,json=mailboxMessages,proto3" json:"mailbox_messages,omitempty"`
 }
 
 func (x *HeartbeatRequest) Reset() {
@@ -121,6 +122,13 @@ func (x *HeartbeatRequest) GetReplicaStats() []*ReplicaStat {
 	return nil
 }
 
+func (x *HeartbeatRequest) GetMailboxMessages() []*MailboxMessage {
+	if x != nil {
+		return x.MailboxMessages
+	}
+	return nil
+}
+
 type NodeStat struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -407,8 +415,8 @@ type HeartbeatResponse struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Header  *ResponseHeader `protobuf:"bytes,1,opt,name=header,proto3" json:"header,omitempty"`
-	Payload [][]byte        `protobuf:"bytes,2,rep,name=payload,proto3" json:"payload,omitempty"`
+	Header          *ResponseHeader   `protobuf:"bytes,1,opt,name=header,proto3" json:"header,omitempty"`
+	MailboxMessages []*MailboxMessage `protobuf:"bytes,2,rep,name=mailbox_messages,json=mailboxMessages,proto3" json:"mailbox_messages,omitempty"`
 }
 
 func (x *HeartbeatResponse) Reset() {
@@ -450,9 +458,9 @@ func (x *HeartbeatResponse) GetHeader() *ResponseHeader {
 	return nil
 }
 
-func (x *HeartbeatResponse) GetPayload() [][]byte {
+func (x *HeartbeatResponse) GetMailboxMessages() []*MailboxMessage {
 	if x != nil {
-		return x.Payload
+		return x.MailboxMessages
 	}
 	return nil
 }
@@ -559,6 +567,118 @@ func (x *AskLeaderResponse) GetLeader() *Peer {
 	return nil
 }
 
+type MailboxMessage struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// The id is used to associate request and response.
+	Id uint64 `protobuf:"varint,1,opt,name=id,proto3" json:"id,omitempty"`
+	// The following information plays a bigger role in making messages traceable and facilitating debugging.
+	Subject string `protobuf:"bytes,2,opt,name=subject,proto3" json:"subject,omitempty"`
+	From    string `protobuf:"bytes,3,opt,name=from,proto3" json:"from,omitempty"`
+	To      string `protobuf:"bytes,4,opt,name=to,proto3" json:"to,omitempty"`
+	// The unix timestamp in milliseconds.
+	TimestampMillis int64 `protobuf:"varint,5,opt,name=timestamp_millis,json=timestampMillis,proto3" json:"timestamp_millis,omitempty"`
+	// The message body.
+	//
+	// Types that are assignable to Payload:
+	//
+	//	*MailboxMessage_Json
+	Payload isMailboxMessage_Payload `protobuf_oneof:"payload"`
+}
+
+func (x *MailboxMessage) Reset() {
+	*x = MailboxMessage{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_greptime_v1_meta_heartbeat_proto_msgTypes[7]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *MailboxMessage) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*MailboxMessage) ProtoMessage() {}
+
+func (x *MailboxMessage) ProtoReflect() protoreflect.Message {
+	mi := &file_greptime_v1_meta_heartbeat_proto_msgTypes[7]
+	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 MailboxMessage.ProtoReflect.Descriptor instead.
+func (*MailboxMessage) Descriptor() ([]byte, []int) {
+	return file_greptime_v1_meta_heartbeat_proto_rawDescGZIP(), []int{7}
+}
+
+func (x *MailboxMessage) GetId() uint64 {
+	if x != nil {
+		return x.Id
+	}
+	return 0
+}
+
+func (x *MailboxMessage) GetSubject() string {
+	if x != nil {
+		return x.Subject
+	}
+	return ""
+}
+
+func (x *MailboxMessage) GetFrom() string {
+	if x != nil {
+		return x.From
+	}
+	return ""
+}
+
+func (x *MailboxMessage) GetTo() string {
+	if x != nil {
+		return x.To
+	}
+	return ""
+}
+
+func (x *MailboxMessage) GetTimestampMillis() int64 {
+	if x != nil {
+		return x.TimestampMillis
+	}
+	return 0
+}
+
+func (m *MailboxMessage) GetPayload() isMailboxMessage_Payload {
+	if m != nil {
+		return m.Payload
+	}
+	return nil
+}
+
+func (x *MailboxMessage) GetJson() string {
+	if x, ok := x.GetPayload().(*MailboxMessage_Json); ok {
+		return x.Json
+	}
+	return ""
+}
+
+type isMailboxMessage_Payload interface {
+	isMailboxMessage_Payload()
+}
+
+type MailboxMessage_Json struct {
+	Json string `protobuf:"bytes,6,opt,name=json,proto3,oneof"`
+}
+
+func (*MailboxMessage_Json) isMailboxMessage_Payload() {}
+
 var File_greptime_v1_meta_heartbeat_proto protoreflect.FileDescriptor
 
 var file_greptime_v1_meta_heartbeat_proto_rawDesc = []byte{
@@ -567,7 +687,7 @@ var file_greptime_v1_meta_heartbeat_proto_rawDesc = []byte{
 	0x74, 0x6f, 0x12, 0x10, 0x67, 0x72, 0x65, 0x70, 0x74, 0x69, 0x6d, 0x65, 0x2e, 0x76, 0x31, 0x2e,
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@@ -593,94 +713,112 @@ var file_greptime_v1_meta_heartbeat_proto_rawDesc = []byte{
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 }
 
 var (
@@ -695,7 +833,7 @@ func file_greptime_v1_meta_heartbeat_proto_rawDescGZIP() []byte {
 	return file_greptime_v1_meta_heartbeat_proto_rawDescData
 }
 
-var file_greptime_v1_meta_heartbeat_proto_msgTypes = make([]protoimpl.MessageInfo, 9)
+var file_greptime_v1_meta_heartbeat_proto_msgTypes = make([]protoimpl.MessageInfo, 10)
 var file_greptime_v1_meta_heartbeat_proto_goTypes = []interface{}{
 	(*HeartbeatRequest)(nil),  // 0: greptime.v1.meta.HeartbeatRequest
 	(*NodeStat)(nil),          // 1: greptime.v1.meta.NodeStat
@@ -704,38 +842,41 @@ var file_greptime_v1_meta_heartbeat_proto_goTypes = []interface{}{
 	(*HeartbeatResponse)(nil), // 4: greptime.v1.meta.HeartbeatResponse
 	(*AskLeaderRequest)(nil),  // 5: greptime.v1.meta.AskLeaderRequest
 	(*AskLeaderResponse)(nil), // 6: greptime.v1.meta.AskLeaderResponse
-	nil,                       // 7: greptime.v1.meta.NodeStat.AttrsEntry
-	nil,                       // 8: greptime.v1.meta.RegionStat.AttrsEntry
-	(*RequestHeader)(nil),     // 9: greptime.v1.meta.RequestHeader
-	(*Peer)(nil),              // 10: greptime.v1.meta.Peer
-	(*TimeInterval)(nil),      // 11: greptime.v1.meta.TimeInterval
-	(*TableName)(nil),         // 12: greptime.v1.meta.TableName
-	(*ResponseHeader)(nil),    // 13: greptime.v1.meta.ResponseHeader
+	(*MailboxMessage)(nil),    // 7: greptime.v1.meta.MailboxMessage
+	nil,                       // 8: greptime.v1.meta.NodeStat.AttrsEntry
+	nil,                       // 9: greptime.v1.meta.RegionStat.AttrsEntry
+	(*RequestHeader)(nil),     // 10: greptime.v1.meta.RequestHeader
+	(*Peer)(nil),              // 11: greptime.v1.meta.Peer
+	(*TimeInterval)(nil),      // 12: greptime.v1.meta.TimeInterval
+	(*TableName)(nil),         // 13: greptime.v1.meta.TableName
+	(*ResponseHeader)(nil),    // 14: greptime.v1.meta.ResponseHeader
 }
 var file_greptime_v1_meta_heartbeat_proto_depIdxs = []int32{
-	9,  // 0: greptime.v1.meta.HeartbeatRequest.header:type_name -> greptime.v1.meta.RequestHeader
-	10, // 1: greptime.v1.meta.HeartbeatRequest.peer:type_name -> greptime.v1.meta.Peer
-	11, // 2: greptime.v1.meta.HeartbeatRequest.report_interval:type_name -> greptime.v1.meta.TimeInterval
+	10, // 0: greptime.v1.meta.HeartbeatRequest.header:type_name -> greptime.v1.meta.RequestHeader
+	11, // 1: greptime.v1.meta.HeartbeatRequest.peer:type_name -> greptime.v1.meta.Peer
+	12, // 2: greptime.v1.meta.HeartbeatRequest.report_interval:type_name -> greptime.v1.meta.TimeInterval
 	1,  // 3: greptime.v1.meta.HeartbeatRequest.node_stat:type_name -> greptime.v1.meta.NodeStat
 	2,  // 4: greptime.v1.meta.HeartbeatRequest.region_stats:type_name -> greptime.v1.meta.RegionStat
 	3,  // 5: greptime.v1.meta.HeartbeatRequest.replica_stats:type_name -> greptime.v1.meta.ReplicaStat
-	7,  // 6: greptime.v1.meta.NodeStat.attrs:type_name -> greptime.v1.meta.NodeStat.AttrsEntry
-	12, // 7: greptime.v1.meta.RegionStat.table_name:type_name -> greptime.v1.meta.TableName
-	8,  // 8: greptime.v1.meta.RegionStat.attrs:type_name -> greptime.v1.meta.RegionStat.AttrsEntry
-	10, // 9: greptime.v1.meta.ReplicaStat.peer:type_name -> greptime.v1.meta.Peer
-	13, // 10: greptime.v1.meta.HeartbeatResponse.header:type_name -> greptime.v1.meta.ResponseHeader
-	9,  // 11: greptime.v1.meta.AskLeaderRequest.header:type_name -> greptime.v1.meta.RequestHeader
-	13, // 12: greptime.v1.meta.AskLeaderResponse.header:type_name -> greptime.v1.meta.ResponseHeader
-	10, // 13: greptime.v1.meta.AskLeaderResponse.leader:type_name -> greptime.v1.meta.Peer
-	0,  // 14: greptime.v1.meta.Heartbeat.Heartbeat:input_type -> greptime.v1.meta.HeartbeatRequest
-	5,  // 15: greptime.v1.meta.Heartbeat.AskLeader:input_type -> greptime.v1.meta.AskLeaderRequest
-	4,  // 16: greptime.v1.meta.Heartbeat.Heartbeat:output_type -> greptime.v1.meta.HeartbeatResponse
-	6,  // 17: greptime.v1.meta.Heartbeat.AskLeader:output_type -> greptime.v1.meta.AskLeaderResponse
-	16, // [16:18] is the sub-list for method output_type
-	14, // [14:16] is the sub-list for method input_type
-	14, // [14:14] is the sub-list for extension type_name
-	14, // [14:14] is the sub-list for extension extendee
-	0,  // [0:14] is the sub-list for field type_name
+	7,  // 6: greptime.v1.meta.HeartbeatRequest.mailbox_messages:type_name -> greptime.v1.meta.MailboxMessage
+	8,  // 7: greptime.v1.meta.NodeStat.attrs:type_name -> greptime.v1.meta.NodeStat.AttrsEntry
+	13, // 8: greptime.v1.meta.RegionStat.table_name:type_name -> greptime.v1.meta.TableName
+	9,  // 9: greptime.v1.meta.RegionStat.attrs:type_name -> greptime.v1.meta.RegionStat.AttrsEntry
+	11, // 10: greptime.v1.meta.ReplicaStat.peer:type_name -> greptime.v1.meta.Peer
+	14, // 11: greptime.v1.meta.HeartbeatResponse.header:type_name -> greptime.v1.meta.ResponseHeader
+	7,  // 12: greptime.v1.meta.HeartbeatResponse.mailbox_messages:type_name -> greptime.v1.meta.MailboxMessage
+	10, // 13: greptime.v1.meta.AskLeaderRequest.header:type_name -> greptime.v1.meta.RequestHeader
+	14, // 14: greptime.v1.meta.AskLeaderResponse.header:type_name -> greptime.v1.meta.ResponseHeader
+	11, // 15: greptime.v1.meta.AskLeaderResponse.leader:type_name -> greptime.v1.meta.Peer
+	0,  // 16: greptime.v1.meta.Heartbeat.Heartbeat:input_type -> greptime.v1.meta.HeartbeatRequest
+	5,  // 17: greptime.v1.meta.Heartbeat.AskLeader:input_type -> greptime.v1.meta.AskLeaderRequest
+	4,  // 18: greptime.v1.meta.Heartbeat.Heartbeat:output_type -> greptime.v1.meta.HeartbeatResponse
+	6,  // 19: greptime.v1.meta.Heartbeat.AskLeader:output_type -> greptime.v1.meta.AskLeaderResponse
+	18, // [18:20] is the sub-list for method output_type
+	16, // [16:18] is the sub-list for method input_type
+	16, // [16:16] is the sub-list for extension type_name
+	16, // [16:16] is the sub-list for extension extendee
+	0,  // [0:16] is the sub-list for field type_name
 }
 
 func init() { file_greptime_v1_meta_heartbeat_proto_init() }
@@ -829,6 +970,21 @@ func file_greptime_v1_meta_heartbeat_proto_init() {
 				return nil
 			}
 		}
+		file_greptime_v1_meta_heartbeat_proto_msgTypes[7].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*MailboxMessage); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+	}
+	file_greptime_v1_meta_heartbeat_proto_msgTypes[7].OneofWrappers = []interface{}{
+		(*MailboxMessage_Json)(nil),
 	}
 	type x struct{}
 	out := protoimpl.TypeBuilder{
@@ -836,7 +992,7 @@ func file_greptime_v1_meta_heartbeat_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_greptime_v1_meta_heartbeat_proto_rawDesc,
 			NumEnums:      0,
-			NumMessages:   9,
+			NumMessages:   10,
 			NumExtensions: 0,
 			NumServices:   1,
 		},