diff --git a/pkg/pb/metadata/metadata.pb.go b/pkg/pb/metadata/metadata.pb.go
index 92d193766ad1a9803f69dc88ec3e1afacf7c4167..2cd37237fc05f7f32721c6d6c7ae4438f6c395af 100644
--- a/pkg/pb/metadata/metadata.pb.go
+++ b/pkg/pb/metadata/metadata.pb.go
@@ -24,6 +24,34 @@ var _ = math.Inf
 // proto package needs to be updated.
 const _ = proto.GoGoProtoPackageIsVersion3 // please upgrade the proto package
 
+// CNRole cn node role
+type CNRole int32
+
+const (
+	// TP tp node
+	CNRole_TP CNRole = 0
+	// AP ap node
+	CNRole_AP CNRole = 1
+)
+
+var CNRole_name = map[int32]string{
+	0: "TP",
+	1: "AP",
+}
+
+var CNRole_value = map[string]int32{
+	"TP": 0,
+	"AP": 1,
+}
+
+func (x CNRole) String() string {
+	return proto.EnumName(CNRole_name, int32(x))
+}
+
+func (CNRole) EnumDescriptor() ([]byte, []int) {
+	return fileDescriptor_56d9f74966f40d04, []int{0}
+}
+
 // DNShardRecord is DN shard metadata describing what is a DN shard. It
 // is internally used by HAKeeper to maintain how many DNs available in
 // the system.
@@ -373,41 +401,104 @@ func (m *LogStore) GetShards() []LogShard {
 	return nil
 }
 
+// CNStore cn store metadata
+type CNStore struct {
+	// UUID CNStore uuid id
+	UUID string `protobuf:"bytes,1,opt,name=UUID,proto3" json:"UUID,omitempty"`
+	// Role CN role
+	Role                 CNRole   `protobuf:"varint,2,opt,name=Role,proto3,enum=metadata.CNRole" json:"Role,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *CNStore) Reset()         { *m = CNStore{} }
+func (m *CNStore) String() string { return proto.CompactTextString(m) }
+func (*CNStore) ProtoMessage()    {}
+func (*CNStore) Descriptor() ([]byte, []int) {
+	return fileDescriptor_56d9f74966f40d04, []int{6}
+}
+func (m *CNStore) XXX_Unmarshal(b []byte) error {
+	return m.Unmarshal(b)
+}
+func (m *CNStore) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	if deterministic {
+		return xxx_messageInfo_CNStore.Marshal(b, m, deterministic)
+	} else {
+		b = b[:cap(b)]
+		n, err := m.MarshalToSizedBuffer(b)
+		if err != nil {
+			return nil, err
+		}
+		return b[:n], nil
+	}
+}
+func (m *CNStore) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_CNStore.Merge(m, src)
+}
+func (m *CNStore) XXX_Size() int {
+	return m.Size()
+}
+func (m *CNStore) XXX_DiscardUnknown() {
+	xxx_messageInfo_CNStore.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_CNStore proto.InternalMessageInfo
+
+func (m *CNStore) GetUUID() string {
+	if m != nil {
+		return m.UUID
+	}
+	return ""
+}
+
+func (m *CNStore) GetRole() CNRole {
+	if m != nil {
+		return m.Role
+	}
+	return CNRole_TP
+}
+
 func init() {
+	proto.RegisterEnum("metadata.CNRole", CNRole_name, CNRole_value)
 	proto.RegisterType((*DNShardRecord)(nil), "metadata.DNShardRecord")
 	proto.RegisterType((*DNShard)(nil), "metadata.DNShard")
 	proto.RegisterType((*LogShardRecord)(nil), "metadata.LogShardRecord")
 	proto.RegisterType((*LogShard)(nil), "metadata.LogShard")
 	proto.RegisterType((*DNStore)(nil), "metadata.DNStore")
 	proto.RegisterType((*LogStore)(nil), "metadata.LogStore")
+	proto.RegisterType((*CNStore)(nil), "metadata.CNStore")
 }
 
 func init() { proto.RegisterFile("metadata.proto", fileDescriptor_56d9f74966f40d04) }
 
 var fileDescriptor_56d9f74966f40d04 = []byte{
-	// 347 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x84, 0x92, 0xdf, 0x4a, 0x02, 0x41,
-	0x14, 0xc6, 0x9b, 0x14, 0xff, 0x1c, 0x49, 0x6a, 0x6e, 0x5a, 0x22, 0x56, 0xd9, 0x2b, 0x09, 0x72,
-	0xcb, 0x1e, 0x20, 0x12, 0x21, 0x8c, 0xb0, 0x98, 0xb0, 0x8b, 0xee, 0x66, 0xdd, 0x71, 0x5c, 0x6a,
-	0x9d, 0x65, 0x1c, 0xa1, 0x67, 0xe8, 0xc9, 0xbc, 0xf4, 0x09, 0x24, 0x7c, 0x92, 0x70, 0x9c, 0xf1,
-	0xcf, 0x2e, 0xd5, 0xdd, 0x7c, 0xe7, 0xcc, 0xfc, 0xce, 0xf7, 0x0d, 0x07, 0xaa, 0x31, 0x53, 0x34,
-	0xa4, 0x8a, 0x36, 0x13, 0x29, 0x94, 0xc0, 0x25, 0xab, 0xcf, 0x2e, 0x79, 0xa4, 0x46, 0xd3, 0xa0,
-	0x39, 0x10, 0xb1, 0xcf, 0x05, 0x17, 0xbe, 0xbe, 0x10, 0x4c, 0x87, 0x5a, 0x69, 0xa1, 0x4f, 0xeb,
-	0x87, 0x5e, 0x17, 0x8e, 0x3a, 0xbd, 0x97, 0x11, 0x95, 0x21, 0x61, 0x03, 0x21, 0x43, 0xec, 0x40,
-	0x51, 0xcb, 0x6e, 0xc7, 0x41, 0x75, 0xd4, 0xc8, 0x13, 0x2b, 0xb1, 0x0b, 0xf0, 0x28, 0xb8, 0x6d,
-	0x1e, 0xea, 0xe6, 0x4e, 0xc5, 0xfb, 0x42, 0x50, 0x34, 0x2c, 0x7c, 0x9f, 0xc2, 0x6a, 0x56, 0xa5,
-	0x75, 0xda, 0xdc, 0xf8, 0xde, 0x6b, 0xb7, 0x4b, 0xb3, 0x45, 0xed, 0x60, 0xbe, 0xa8, 0x21, 0x92,
-	0xb2, 0x73, 0x0e, 0x65, 0xc2, 0x92, 0x8f, 0x68, 0x40, 0x37, 0x33, 0xb7, 0x85, 0x95, 0xd9, 0xbb,
-	0x30, 0x94, 0x6c, 0x32, 0x71, 0x72, 0x75, 0xd4, 0x28, 0x13, 0x2b, 0xbd, 0x57, 0xa8, 0x5a, 0x6b,
-	0xff, 0x06, 0xbb, 0x80, 0xe3, 0xde, 0x34, 0x0e, 0x98, 0x7c, 0x1a, 0x1a, 0xf4, 0xc4, 0x8c, 0xca,
-	0xd4, 0x3d, 0x05, 0x25, 0xcb, 0xc5, 0x0f, 0xe9, 0x19, 0x26, 0xa5, 0xb3, 0x4d, 0xb9, 0xdf, 0xdf,
-	0x89, 0x99, 0x76, 0xf7, 0x67, 0x4e, 0xaf, 0xa7, 0x7f, 0x56, 0x09, 0xc9, 0x30, 0x86, 0x7c, 0xbf,
-	0x6f, 0x32, 0x94, 0x89, 0x3e, 0x63, 0x1f, 0x0a, 0x9a, 0xb5, 0xb2, 0x9d, 0x6b, 0x54, 0x5a, 0x27,
-	0x99, 0x6f, 0x6e, 0xe7, 0x57, 0x93, 0x89, 0xb9, 0xe6, 0x3d, 0xaf, 0x53, 0xfc, 0x0a, 0xbc, 0x4a,
-	0x01, 0x71, 0x36, 0xd1, 0x3e, 0xb1, 0x7d, 0x3b, 0x5b, 0xba, 0x68, 0xbe, 0x74, 0xd1, 0xf7, 0xd2,
-	0x45, 0x6f, 0xd7, 0x3b, 0x4b, 0x18, 0x53, 0x25, 0xa3, 0x4f, 0x21, 0x23, 0x1e, 0x8d, 0xad, 0x18,
-	0x33, 0x3f, 0x79, 0xe7, 0x7e, 0x12, 0xf8, 0x96, 0x1b, 0x14, 0xf4, 0x3e, 0xde, 0xfc, 0x04, 0x00,
-	0x00, 0xff, 0xff, 0x2d, 0x13, 0xf1, 0xfd, 0xda, 0x02, 0x00, 0x00,
+	// 390 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x84, 0x92, 0xdf, 0x6a, 0xe2, 0x40,
+	0x14, 0xc6, 0x1d, 0x0d, 0x51, 0x8f, 0xac, 0x64, 0xe7, 0x66, 0xc3, 0xb2, 0x44, 0x09, 0x7b, 0x21,
+	0xc2, 0x9a, 0xad, 0x7d, 0x80, 0xe2, 0x1f, 0x28, 0x96, 0x92, 0xca, 0xb4, 0xf6, 0xa2, 0x77, 0x89,
+	0x19, 0x63, 0xa8, 0x71, 0xc2, 0x18, 0xa1, 0xcf, 0xd0, 0x27, 0xf3, 0xd2, 0x27, 0x90, 0xe2, 0x93,
+	0x94, 0x8c, 0x19, 0xff, 0x44, 0x6a, 0xaf, 0x32, 0xdf, 0x39, 0x93, 0xdf, 0xf9, 0xbe, 0xe1, 0x40,
+	0x35, 0xa4, 0xb1, 0xe3, 0x39, 0xb1, 0xd3, 0x8a, 0x38, 0x8b, 0x19, 0x2e, 0x49, 0xfd, 0xfb, 0x9f,
+	0x1f, 0xc4, 0xd3, 0xa5, 0xdb, 0x1a, 0xb3, 0xd0, 0xf2, 0x99, 0xcf, 0x2c, 0x71, 0xc1, 0x5d, 0x4e,
+	0x84, 0x12, 0x42, 0x9c, 0x76, 0x3f, 0x9a, 0x03, 0xf8, 0xd1, 0xb7, 0x1f, 0xa7, 0x0e, 0xf7, 0x08,
+	0x1d, 0x33, 0xee, 0x61, 0x1d, 0x8a, 0x42, 0x0e, 0xfa, 0x3a, 0xaa, 0xa3, 0x86, 0x42, 0xa4, 0xc4,
+	0x06, 0xc0, 0x3d, 0xf3, 0x65, 0x33, 0x2f, 0x9a, 0x47, 0x15, 0xf3, 0x1d, 0x41, 0x31, 0x65, 0xe1,
+	0xdb, 0x0c, 0x56, 0xb0, 0x2a, 0xed, 0x5f, 0xad, 0xbd, 0xef, 0x93, 0x76, 0xb7, 0xb4, 0xda, 0xd4,
+	0x72, 0xeb, 0x4d, 0x0d, 0x91, 0x8c, 0x9d, 0x3f, 0x50, 0x26, 0x34, 0x9a, 0x05, 0x63, 0x67, 0x3f,
+	0xf3, 0x50, 0x48, 0xcc, 0x76, 0x3c, 0x8f, 0xd3, 0xc5, 0x42, 0x2f, 0xd4, 0x51, 0xa3, 0x4c, 0xa4,
+	0x34, 0x9f, 0xa1, 0x2a, 0xad, 0x7d, 0x1b, 0xac, 0x09, 0x9a, 0xbd, 0x0c, 0x5d, 0xca, 0x1f, 0x26,
+	0x29, 0x7a, 0x91, 0x8e, 0x3a, 0xab, 0x9b, 0x31, 0x94, 0x24, 0x17, 0xdf, 0x65, 0x67, 0xa4, 0x29,
+	0xf5, 0x43, 0xca, 0xd3, 0xfe, 0x51, 0xcc, 0xac, 0xbb, 0x8b, 0x39, 0x4d, 0x5b, 0xbc, 0x6c, 0xcc,
+	0x38, 0xc5, 0x18, 0x94, 0xd1, 0x28, 0xcd, 0x50, 0x26, 0xe2, 0x8c, 0x2d, 0x50, 0x05, 0x2b, 0xb1,
+	0x5d, 0x68, 0x54, 0xda, 0x3f, 0xcf, 0x9e, 0xb9, 0xab, 0x24, 0x93, 0x49, 0x7a, 0xcd, 0x1c, 0xee,
+	0x52, 0x7c, 0x09, 0xfc, 0x9f, 0x01, 0xe2, 0xf3, 0x44, 0x19, 0x62, 0x0f, 0x8a, 0xbd, 0x0b, 0x0e,
+	0xff, 0x82, 0x42, 0xd8, 0x8c, 0x8a, 0x64, 0xd5, 0xb6, 0x76, 0xc0, 0xf5, 0xec, 0xa4, 0x4e, 0x44,
+	0xb7, 0xa9, 0x83, 0xba, 0xd3, 0x58, 0x85, 0xfc, 0xd3, 0x50, 0xcb, 0x25, 0xdf, 0xce, 0x50, 0x43,
+	0xdd, 0x9b, 0xd5, 0xd6, 0x40, 0xeb, 0xad, 0x81, 0x3e, 0xb6, 0x06, 0x7a, 0xb9, 0x3a, 0xda, 0xf1,
+	0xd0, 0x89, 0x79, 0xf0, 0xc6, 0x78, 0xe0, 0x07, 0x73, 0x29, 0xe6, 0xd4, 0x8a, 0x5e, 0x7d, 0x2b,
+	0x72, 0x2d, 0x39, 0xc7, 0x55, 0xc5, 0xba, 0x5f, 0x7f, 0x06, 0x00, 0x00, 0xff, 0xff, 0x73, 0x05,
+	0xd9, 0x15, 0x39, 0x03, 0x00, 0x00,
 }
 
 func (m *DNShardRecord) Marshal() (dAtA []byte, err error) {
@@ -671,6 +762,45 @@ func (m *LogStore) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	return len(dAtA) - i, nil
 }
 
+func (m *CNStore) Marshal() (dAtA []byte, err error) {
+	size := m.Size()
+	dAtA = make([]byte, size)
+	n, err := m.MarshalToSizedBuffer(dAtA[:size])
+	if err != nil {
+		return nil, err
+	}
+	return dAtA[:n], nil
+}
+
+func (m *CNStore) MarshalTo(dAtA []byte) (int, error) {
+	size := m.Size()
+	return m.MarshalToSizedBuffer(dAtA[:size])
+}
+
+func (m *CNStore) MarshalToSizedBuffer(dAtA []byte) (int, error) {
+	i := len(dAtA)
+	_ = i
+	var l int
+	_ = l
+	if m.XXX_unrecognized != nil {
+		i -= len(m.XXX_unrecognized)
+		copy(dAtA[i:], m.XXX_unrecognized)
+	}
+	if m.Role != 0 {
+		i = encodeVarintMetadata(dAtA, i, uint64(m.Role))
+		i--
+		dAtA[i] = 0x10
+	}
+	if len(m.UUID) > 0 {
+		i -= len(m.UUID)
+		copy(dAtA[i:], m.UUID)
+		i = encodeVarintMetadata(dAtA, i, uint64(len(m.UUID)))
+		i--
+		dAtA[i] = 0xa
+	}
+	return len(dAtA) - i, nil
+}
+
 func encodeVarintMetadata(dAtA []byte, offset int, v uint64) int {
 	offset -= sovMetadata(v)
 	base := offset
@@ -800,6 +930,25 @@ func (m *LogStore) Size() (n int) {
 	return n
 }
 
+func (m *CNStore) Size() (n int) {
+	if m == nil {
+		return 0
+	}
+	var l int
+	_ = l
+	l = len(m.UUID)
+	if l > 0 {
+		n += 1 + l + sovMetadata(uint64(l))
+	}
+	if m.Role != 0 {
+		n += 1 + sovMetadata(uint64(m.Role))
+	}
+	if m.XXX_unrecognized != nil {
+		n += len(m.XXX_unrecognized)
+	}
+	return n
+}
+
 func sovMetadata(x uint64) (n int) {
 	return (math_bits.Len64(x|1) + 6) / 7
 }
@@ -1456,6 +1605,108 @@ func (m *LogStore) Unmarshal(dAtA []byte) error {
 	}
 	return nil
 }
+func (m *CNStore) Unmarshal(dAtA []byte) error {
+	l := len(dAtA)
+	iNdEx := 0
+	for iNdEx < l {
+		preIndex := iNdEx
+		var wire uint64
+		for shift := uint(0); ; shift += 7 {
+			if shift >= 64 {
+				return ErrIntOverflowMetadata
+			}
+			if iNdEx >= l {
+				return io.ErrUnexpectedEOF
+			}
+			b := dAtA[iNdEx]
+			iNdEx++
+			wire |= uint64(b&0x7F) << shift
+			if b < 0x80 {
+				break
+			}
+		}
+		fieldNum := int32(wire >> 3)
+		wireType := int(wire & 0x7)
+		if wireType == 4 {
+			return fmt.Errorf("proto: CNStore: wiretype end group for non-group")
+		}
+		if fieldNum <= 0 {
+			return fmt.Errorf("proto: CNStore: illegal tag %d (wire type %d)", fieldNum, wire)
+		}
+		switch fieldNum {
+		case 1:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field UUID", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowMetadata
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				stringLen |= uint64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			intStringLen := int(stringLen)
+			if intStringLen < 0 {
+				return ErrInvalidLengthMetadata
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex < 0 {
+				return ErrInvalidLengthMetadata
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.UUID = string(dAtA[iNdEx:postIndex])
+			iNdEx = postIndex
+		case 2:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Role", wireType)
+			}
+			m.Role = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowMetadata
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.Role |= CNRole(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		default:
+			iNdEx = preIndex
+			skippy, err := skipMetadata(dAtA[iNdEx:])
+			if err != nil {
+				return err
+			}
+			if (skippy < 0) || (iNdEx+skippy) < 0 {
+				return ErrInvalidLengthMetadata
+			}
+			if (iNdEx + skippy) > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.XXX_unrecognized = append(m.XXX_unrecognized, dAtA[iNdEx:iNdEx+skippy]...)
+			iNdEx += skippy
+		}
+	}
+
+	if iNdEx > l {
+		return io.ErrUnexpectedEOF
+	}
+	return nil
+}
 func skipMetadata(dAtA []byte) (n int, err error) {
 	l := len(dAtA)
 	iNdEx := 0
diff --git a/proto/metadata.proto b/proto/metadata.proto
index daa46ce7835f0a897f7435b1e4cc6bd58b6adad7..941383d09e87954df4840cb5d32b5f186970caef 100644
--- a/proto/metadata.proto
+++ b/proto/metadata.proto
@@ -75,3 +75,19 @@ message LogStore {
   // Shards is for Log shards metadata.
   repeated LogShard Shards = 2 [(gogoproto.nullable) = false];
 }
+
+// CNRole cn node role
+enum CNRole {
+  // TP tp node
+  TP = 0;
+  // AP ap node
+  AP = 1;
+}
+
+// CNStore cn store metadata
+message CNStore {
+  // UUID CNStore uuid id
+  string UUID = 1;
+  // Role CN role
+  CNRole Role  = 2;
+}
\ No newline at end of file