diff --git a/pkg/cdcpb/cdcpb.pb.go b/pkg/cdcpb/cdcpb.pb.go
index 995963996..749c9d61c 100644
--- a/pkg/cdcpb/cdcpb.pb.go
+++ b/pkg/cdcpb/cdcpb.pb.go
@@ -66,7 +66,7 @@ func (x Event_LogType) String() string {
 }
 
 func (Event_LogType) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_911209a1d38ef245, []int{7, 0}
+	return fileDescriptor_911209a1d38ef245, []int{8, 0}
 }
 
 type Event_Row_OpType int32
@@ -94,7 +94,7 @@ func (x Event_Row_OpType) String() string {
 }
 
 func (Event_Row_OpType) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_911209a1d38ef245, []int{7, 0, 0}
+	return fileDescriptor_911209a1d38ef245, []int{8, 0, 0}
 }
 
 // KvAPI specifies to capture data written by different KV API.
@@ -124,7 +124,7 @@ func (x ChangeDataRequest_KvAPI) String() string {
 }
 
 func (ChangeDataRequest_KvAPI) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_911209a1d38ef245, []int{10, 0}
+	return fileDescriptor_911209a1d38ef245, []int{11, 0}
 }
 
 type Header struct {
@@ -335,6 +335,56 @@ func (m *ClusterIDMismatch) GetRequest() uint64 {
 	return 0
 }
 
+// Congested is an error variable that
+// tells people that the TiKV-CDC is congested.
+type Congested struct {
+	// The region ID that triggers the congestion.
+	RegionId             uint64   `protobuf:"varint,1,opt,name=region_id,json=regionId,proto3" json:"region_id,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *Congested) Reset()         { *m = Congested{} }
+func (m *Congested) String() string { return proto.CompactTextString(m) }
+func (*Congested) ProtoMessage()    {}
+func (*Congested) Descriptor() ([]byte, []int) {
+	return fileDescriptor_911209a1d38ef245, []int{4}
+}
+func (m *Congested) XXX_Unmarshal(b []byte) error {
+	return m.Unmarshal(b)
+}
+func (m *Congested) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	if deterministic {
+		return xxx_messageInfo_Congested.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 *Congested) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_Congested.Merge(m, src)
+}
+func (m *Congested) XXX_Size() int {
+	return m.Size()
+}
+func (m *Congested) XXX_DiscardUnknown() {
+	xxx_messageInfo_Congested.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_Congested proto.InternalMessageInfo
+
+func (m *Congested) GetRegionId() uint64 {
+	if m != nil {
+		return m.RegionId
+	}
+	return 0
+}
+
 type Error struct {
 	NotLeader            *errorpb.NotLeader      `protobuf:"bytes,1,opt,name=not_leader,json=notLeader,proto3" json:"not_leader,omitempty"`
 	RegionNotFound       *errorpb.RegionNotFound `protobuf:"bytes,2,opt,name=region_not_found,json=regionNotFound,proto3" json:"region_not_found,omitempty"`
@@ -343,6 +393,7 @@ type Error struct {
 	Compatibility        *Compatibility          `protobuf:"bytes,5,opt,name=compatibility,proto3" json:"compatibility,omitempty"`
 	ClusterIdMismatch    *ClusterIDMismatch      `protobuf:"bytes,6,opt,name=cluster_id_mismatch,json=clusterIdMismatch,proto3" json:"cluster_id_mismatch,omitempty"`
 	ServerIsBusy         *errorpb.ServerIsBusy   `protobuf:"bytes,7,opt,name=server_is_busy,json=serverIsBusy,proto3" json:"server_is_busy,omitempty"`
+	Congested            *Congested              `protobuf:"bytes,8,opt,name=congested,proto3" json:"congested,omitempty"`
 	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
 	XXX_unrecognized     []byte                  `json:"-"`
 	XXX_sizecache        int32                   `json:"-"`
@@ -352,7 +403,7 @@ func (m *Error) Reset()         { *m = Error{} }
 func (m *Error) String() string { return proto.CompactTextString(m) }
 func (*Error) ProtoMessage()    {}
 func (*Error) Descriptor() ([]byte, []int) {
-	return fileDescriptor_911209a1d38ef245, []int{4}
+	return fileDescriptor_911209a1d38ef245, []int{5}
 }
 func (m *Error) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -430,6 +481,13 @@ func (m *Error) GetServerIsBusy() *errorpb.ServerIsBusy {
 	return nil
 }
 
+func (m *Error) GetCongested() *Congested {
+	if m != nil {
+		return m.Congested
+	}
+	return nil
+}
+
 type TxnInfo struct {
 	StartTs              uint64   `protobuf:"varint,1,opt,name=start_ts,json=startTs,proto3" json:"start_ts,omitempty"`
 	Primary              []byte   `protobuf:"bytes,2,opt,name=primary,proto3" json:"primary,omitempty"`
@@ -442,7 +500,7 @@ func (m *TxnInfo) Reset()         { *m = TxnInfo{} }
 func (m *TxnInfo) String() string { return proto.CompactTextString(m) }
 func (*TxnInfo) ProtoMessage()    {}
 func (*TxnInfo) Descriptor() ([]byte, []int) {
-	return fileDescriptor_911209a1d38ef245, []int{5}
+	return fileDescriptor_911209a1d38ef245, []int{6}
 }
 func (m *TxnInfo) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -499,7 +557,7 @@ func (m *TxnStatus) Reset()         { *m = TxnStatus{} }
 func (m *TxnStatus) String() string { return proto.CompactTextString(m) }
 func (*TxnStatus) ProtoMessage()    {}
 func (*TxnStatus) Descriptor() ([]byte, []int) {
-	return fileDescriptor_911209a1d38ef245, []int{6}
+	return fileDescriptor_911209a1d38ef245, []int{7}
 }
 func (m *TxnStatus) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -576,7 +634,7 @@ func (m *Event) Reset()         { *m = Event{} }
 func (m *Event) String() string { return proto.CompactTextString(m) }
 func (*Event) ProtoMessage()    {}
 func (*Event) Descriptor() ([]byte, []int) {
-	return fileDescriptor_911209a1d38ef245, []int{7}
+	return fileDescriptor_911209a1d38ef245, []int{8}
 }
 func (m *Event) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -733,7 +791,7 @@ func (m *Event_Row) Reset()         { *m = Event_Row{} }
 func (m *Event_Row) String() string { return proto.CompactTextString(m) }
 func (*Event_Row) ProtoMessage()    {}
 func (*Event_Row) Descriptor() ([]byte, []int) {
-	return fileDescriptor_911209a1d38ef245, []int{7, 0}
+	return fileDescriptor_911209a1d38ef245, []int{8, 0}
 }
 func (m *Event_Row) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -843,7 +901,7 @@ func (m *Event_Entries) Reset()         { *m = Event_Entries{} }
 func (m *Event_Entries) String() string { return proto.CompactTextString(m) }
 func (*Event_Entries) ProtoMessage()    {}
 func (*Event_Entries) Descriptor() ([]byte, []int) {
-	return fileDescriptor_911209a1d38ef245, []int{7, 1}
+	return fileDescriptor_911209a1d38ef245, []int{8, 1}
 }
 func (m *Event_Entries) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -891,7 +949,7 @@ func (m *Event_Admin) Reset()         { *m = Event_Admin{} }
 func (m *Event_Admin) String() string { return proto.CompactTextString(m) }
 func (*Event_Admin) ProtoMessage()    {}
 func (*Event_Admin) Descriptor() ([]byte, []int) {
-	return fileDescriptor_911209a1d38ef245, []int{7, 2}
+	return fileDescriptor_911209a1d38ef245, []int{8, 2}
 }
 func (m *Event_Admin) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -945,7 +1003,7 @@ func (m *Event_LongTxn) Reset()         { *m = Event_LongTxn{} }
 func (m *Event_LongTxn) String() string { return proto.CompactTextString(m) }
 func (*Event_LongTxn) ProtoMessage()    {}
 func (*Event_LongTxn) Descriptor() ([]byte, []int) {
-	return fileDescriptor_911209a1d38ef245, []int{7, 3}
+	return fileDescriptor_911209a1d38ef245, []int{8, 3}
 }
 func (m *Event_LongTxn) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -994,7 +1052,7 @@ func (m *ChangeDataEvent) Reset()         { *m = ChangeDataEvent{} }
 func (m *ChangeDataEvent) String() string { return proto.CompactTextString(m) }
 func (*ChangeDataEvent) ProtoMessage()    {}
 func (*ChangeDataEvent) Descriptor() ([]byte, []int) {
-	return fileDescriptor_911209a1d38ef245, []int{8}
+	return fileDescriptor_911209a1d38ef245, []int{9}
 }
 func (m *ChangeDataEvent) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1050,7 +1108,7 @@ func (m *ResolvedTs) Reset()         { *m = ResolvedTs{} }
 func (m *ResolvedTs) String() string { return proto.CompactTextString(m) }
 func (*ResolvedTs) ProtoMessage()    {}
 func (*ResolvedTs) Descriptor() ([]byte, []int) {
-	return fileDescriptor_911209a1d38ef245, []int{9}
+	return fileDescriptor_911209a1d38ef245, []int{10}
 }
 func (m *ResolvedTs) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1129,7 +1187,7 @@ func (m *ChangeDataRequest) Reset()         { *m = ChangeDataRequest{} }
 func (m *ChangeDataRequest) String() string { return proto.CompactTextString(m) }
 func (*ChangeDataRequest) ProtoMessage()    {}
 func (*ChangeDataRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_911209a1d38ef245, []int{10}
+	return fileDescriptor_911209a1d38ef245, []int{11}
 }
 func (m *ChangeDataRequest) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1295,7 +1353,7 @@ func (m *ChangeDataRequest_Register) Reset()         { *m = ChangeDataRequest_Re
 func (m *ChangeDataRequest_Register) String() string { return proto.CompactTextString(m) }
 func (*ChangeDataRequest_Register) ProtoMessage()    {}
 func (*ChangeDataRequest_Register) Descriptor() ([]byte, []int) {
-	return fileDescriptor_911209a1d38ef245, []int{10, 0}
+	return fileDescriptor_911209a1d38ef245, []int{11, 0}
 }
 func (m *ChangeDataRequest_Register) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1334,7 +1392,7 @@ func (m *ChangeDataRequest_Deregister) Reset()         { *m = ChangeDataRequest_
 func (m *ChangeDataRequest_Deregister) String() string { return proto.CompactTextString(m) }
 func (*ChangeDataRequest_Deregister) ProtoMessage()    {}
 func (*ChangeDataRequest_Deregister) Descriptor() ([]byte, []int) {
-	return fileDescriptor_911209a1d38ef245, []int{10, 1}
+	return fileDescriptor_911209a1d38ef245, []int{11, 1}
 }
 func (m *ChangeDataRequest_Deregister) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1374,7 +1432,7 @@ func (m *ChangeDataRequest_NotifyTxnStatus) Reset()         { *m = ChangeDataReq
 func (m *ChangeDataRequest_NotifyTxnStatus) String() string { return proto.CompactTextString(m) }
 func (*ChangeDataRequest_NotifyTxnStatus) ProtoMessage()    {}
 func (*ChangeDataRequest_NotifyTxnStatus) Descriptor() ([]byte, []int) {
-	return fileDescriptor_911209a1d38ef245, []int{10, 2}
+	return fileDescriptor_911209a1d38ef245, []int{11, 2}
 }
 func (m *ChangeDataRequest_NotifyTxnStatus) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1418,6 +1476,7 @@ func init() {
 	proto.RegisterType((*DuplicateRequest)(nil), "cdcpb.DuplicateRequest")
 	proto.RegisterType((*Compatibility)(nil), "cdcpb.Compatibility")
 	proto.RegisterType((*ClusterIDMismatch)(nil), "cdcpb.ClusterIDMismatch")
+	proto.RegisterType((*Congested)(nil), "cdcpb.Congested")
 	proto.RegisterType((*Error)(nil), "cdcpb.Error")
 	proto.RegisterType((*TxnInfo)(nil), "cdcpb.TxnInfo")
 	proto.RegisterType((*TxnStatus)(nil), "cdcpb.TxnStatus")
@@ -1437,102 +1496,104 @@ func init() {
 func init() { proto.RegisterFile("cdcpb.proto", fileDescriptor_911209a1d38ef245) }
 
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+	0xe6, 0x99, 0x46, 0x18, 0x69, 0x6f, 0x8f, 0x9b, 0x4a, 0xcb, 0x7e, 0x64, 0x4a, 0x93, 0x79, 0xdb,
+	0x9c, 0xbd, 0xe6, 0x05, 0xc0, 0x1a, 0x51, 0xaf, 0xb3, 0x64, 0x1d, 0x75, 0x10, 0xbe, 0xce, 0x28,
+	0x92, 0x1a, 0xa4, 0x93, 0x31, 0x4a, 0x8b, 0x70, 0x87, 0x7d, 0x32, 0x3b, 0xec, 0xd3, 0xfc, 0x63,
+	0x1e, 0xf6, 0xd7, 0x97, 0x88, 0x4b, 0xf7, 0x0c, 0xf2, 0x37, 0x9b, 0x4f, 0x75, 0x35, 0x8a, 0x4d,
+	0x7d, 0xfb, 0xd0, 0x08, 0xdc, 0x26, 0xc3, 0xf4, 0x0e, 0x19, 0xfe, 0x12, 0x2a, 0x11, 0x88, 0x8f,
+	0x6a, 0x44, 0x6e, 0xf7, 0x5a, 0xd1, 0x47, 0x99, 0x7a, 0xba, 0xf1, 0xf9, 0xa5, 0xe5, 0x60, 0x2d,
+	0xc8, 0x2f, 0x27, 0xfb, 0x86, 0xd9, 0x13, 0x9f, 0xbb, 0x1e, 0x52, 0x42, 0x16, 0x1d, 0x57, 0xd6,
+	0x4a, 0xc5, 0x19, 0x8a, 0x4e, 0xd6, 0x03, 0xaa, 0xf8, 0xe5, 0x84, 0xad, 0xc8, 0x43, 0xd9, 0xed,
+	0x0e, 0x42, 0x6a, 0x4e, 0xf3, 0xcc, 0x73, 0x24, 0xf0, 0x2d, 0x4c, 0xfc, 0x53, 0x28, 0xb2, 0xa5,
+	0x08, 0x2c, 0x93, 0xfb, 0x38, 0x9f, 0xb5, 0xb6, 0xde, 0x8a, 0xbf, 0x12, 0xfb, 0x12, 0x38, 0xf3,
+	0x69, 0x81, 0xa9, 0x05, 0xf9, 0x0d, 0xe0, 0x55, 0xe5, 0x2b, 0x8b, 0x63, 0x5a, 0x6e, 0xff, 0x28,
+	0x7e, 0x11, 0x77, 0xd3, 0x89, 0x77, 0x95, 0x86, 0xc7, 0x29, 0x9a, 0x6c, 0x22, 0x97, 0xb0, 0xef,
+	0x71, 0xe1, 0x5e, 0xaf, 0x4c, 0x1c, 0x78, 0x7c, 0xea, 0x90, 0xb6, 0xca, 0xed, 0xc3, 0x5b, 0x3d,
+	0x8d, 0x70, 0x47, 0xf2, 0x34, 0x1e, 0xa7, 0xe8, 0x9e, 0xb7, 0xad, 0x22, 0x7d, 0x00, 0x87, 0x25,
+	0xa1, 0x55, 0xd1, 0xe1, 0x93, 0x5b, 0x1d, 0xf6, 0x12, 0x53, 0xc9, 0xf5, 0xeb, 0x8d, 0xe4, 0x0d,
+	0xe4, 0x27, 0x0b, 0xd3, 0xf2, 0xdd, 0x7a, 0x19, 0x53, 0x71, 0x70, 0xab, 0x8b, 0x93, 0xc5, 0xd1,
+	0x87, 0x01, 0xcd, 0x4d, 0x16, 0x47, 0xbe, 0x4b, 0x7e, 0x08, 0xe5, 0x6b, 0x77, 0x2a, 0xbf, 0x57,
+	0xa6, 0x9c, 0xfb, 0xf5, 0x0a, 0x3e, 0xa6, 0xa0, 0x54, 0x43, 0xce, 0xfd, 0x06, 0x40, 0x31, 0x4e,
+	0x47, 0xa3, 0x02, 0xb0, 0x3e, 0xbf, 0xd1, 0x81, 0xbd, 0x9d, 0xeb, 0x91, 0x97, 0x11, 0x1b, 0xaa,
+	0xe4, 0x6c, 0x53, 0x57, 0x62, 0xa5, 0xf8, 0x11, 0x97, 0xcd, 0x9f, 0x40, 0x0e, 0xc3, 0x21, 0x45,
+	0xc8, 0x1a, 0x6e, 0xaf, 0xa3, 0xa7, 0x48, 0x09, 0x72, 0xd4, 0xfa, 0x7c, 0x72, 0xa9, 0x6b, 0x72,
+	0x69, 0x2c, 0xbd, 0x93, 0x4b, 0x3d, 0xdd, 0x29, 0x25, 0x9f, 0xb7, 0xed, 0xbf, 0x6a, 0x00, 0xeb,
+	0x5b, 0x91, 0x23, 0x28, 0xe1, 0xb4, 0xbe, 0x67, 0xcc, 0x21, 0xf5, 0xdb, 0x6e, 0xdd, 0x78, 0xf0,
+	0x15, 0x82, 0xbb, 0x0e, 0xb5, 0x57, 0x1a, 0xe9, 0x42, 0x39, 0x71, 0x71, 0xd9, 0xfe, 0x6e, 0x4e,
+	0x3a, 0x3f, 0xfe, 0xd7, 0xdf, 0x8b, 0xda, 0x3f, 0xbe, 0x1c, 0x68, 0xff, 0xfc, 0x72, 0xa0, 0xfd,
+	0xfb, 0xcb, 0x81, 0xf6, 0xb7, 0xff, 0x1c, 0xa4, 0x40, 0xe7, 0xc1, 0xb8, 0x25, 0xdc, 0xc9, 0xa2,
+	0x35, 0x59, 0xe0, 0x5f, 0x92, 0xab, 0x3c, 0xfe, 0xfc, 0xfc, 0xff, 0x01, 0x00, 0x00, 0xff, 0xff,
+	0x04, 0x23, 0x11, 0xea, 0x14, 0x0d, 0x00, 0x00,
 }
 
 // Reference imports to suppress errors if they are not otherwise used.
@@ -1865,6 +1926,38 @@ func (m *ClusterIDMismatch) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	return len(dAtA) - i, nil
 }
 
+func (m *Congested) 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 *Congested) MarshalTo(dAtA []byte) (int, error) {
+	size := m.Size()
+	return m.MarshalToSizedBuffer(dAtA[:size])
+}
+
+func (m *Congested) 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.RegionId != 0 {
+		i = encodeVarintCdcpb(dAtA, i, uint64(m.RegionId))
+		i--
+		dAtA[i] = 0x8
+	}
+	return len(dAtA) - i, nil
+}
+
 func (m *Error) Marshal() (dAtA []byte, err error) {
 	size := m.Size()
 	dAtA = make([]byte, size)
@@ -1889,6 +1982,18 @@ func (m *Error) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 		i -= len(m.XXX_unrecognized)
 		copy(dAtA[i:], m.XXX_unrecognized)
 	}
+	if m.Congested != nil {
+		{
+			size, err := m.Congested.MarshalToSizedBuffer(dAtA[:i])
+			if err != nil {
+				return 0, err
+			}
+			i -= size
+			i = encodeVarintCdcpb(dAtA, i, uint64(size))
+		}
+		i--
+		dAtA[i] = 0x42
+	}
 	if m.ServerIsBusy != nil {
 		{
 			size, err := m.ServerIsBusy.MarshalToSizedBuffer(dAtA[:i])
@@ -2518,20 +2623,20 @@ func (m *ResolvedTs) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 		dAtA[i] = 0x10
 	}
 	if len(m.Regions) > 0 {
-		dAtA16 := make([]byte, len(m.Regions)*10)
-		var j15 int
+		dAtA17 := make([]byte, len(m.Regions)*10)
+		var j16 int
 		for _, num := range m.Regions {
 			for num >= 1<<7 {
-				dAtA16[j15] = uint8(uint64(num)&0x7f | 0x80)
+				dAtA17[j16] = uint8(uint64(num)&0x7f | 0x80)
 				num >>= 7
-				j15++
+				j16++
 			}
-			dAtA16[j15] = uint8(num)
-			j15++
+			dAtA17[j16] = uint8(num)
+			j16++
 		}
-		i -= j15
-		copy(dAtA[i:], dAtA16[:j15])
-		i = encodeVarintCdcpb(dAtA, i, uint64(j15))
+		i -= j16
+		copy(dAtA[i:], dAtA17[:j16])
+		i = encodeVarintCdcpb(dAtA, i, uint64(j16))
 		i--
 		dAtA[i] = 0xa
 	}
@@ -2884,6 +2989,21 @@ func (m *ClusterIDMismatch) Size() (n int) {
 	return n
 }
 
+func (m *Congested) Size() (n int) {
+	if m == nil {
+		return 0
+	}
+	var l int
+	_ = l
+	if m.RegionId != 0 {
+		n += 1 + sovCdcpb(uint64(m.RegionId))
+	}
+	if m.XXX_unrecognized != nil {
+		n += len(m.XXX_unrecognized)
+	}
+	return n
+}
+
 func (m *Error) Size() (n int) {
 	if m == nil {
 		return 0
@@ -2918,6 +3038,10 @@ func (m *Error) Size() (n int) {
 		l = m.ServerIsBusy.Size()
 		n += 1 + l + sovCdcpb(uint64(l))
 	}
+	if m.Congested != nil {
+		l = m.Congested.Size()
+		n += 1 + l + sovCdcpb(uint64(l))
+	}
 	if m.XXX_unrecognized != nil {
 		n += len(m.XXX_unrecognized)
 	}
@@ -3673,6 +3797,76 @@ func (m *ClusterIDMismatch) Unmarshal(dAtA []byte) error {
 	}
 	return nil
 }
+func (m *Congested) 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 ErrIntOverflowCdcpb
+			}
+			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: Congested: wiretype end group for non-group")
+		}
+		if fieldNum <= 0 {
+			return fmt.Errorf("proto: Congested: illegal tag %d (wire type %d)", fieldNum, wire)
+		}
+		switch fieldNum {
+		case 1:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field RegionId", wireType)
+			}
+			m.RegionId = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowCdcpb
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.RegionId |= uint64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		default:
+			iNdEx = preIndex
+			skippy, err := skipCdcpb(dAtA[iNdEx:])
+			if err != nil {
+				return err
+			}
+			if (skippy < 0) || (iNdEx+skippy) < 0 {
+				return ErrInvalidLengthCdcpb
+			}
+			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 (m *Error) Unmarshal(dAtA []byte) error {
 	l := len(dAtA)
 	iNdEx := 0
@@ -3954,6 +4148,42 @@ func (m *Error) Unmarshal(dAtA []byte) error {
 				return err
 			}
 			iNdEx = postIndex
+		case 8:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Congested", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowCdcpb
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= int(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthCdcpb
+			}
+			postIndex := iNdEx + msglen
+			if postIndex < 0 {
+				return ErrInvalidLengthCdcpb
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			if m.Congested == nil {
+				m.Congested = &Congested{}
+			}
+			if err := m.Congested.Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
+				return err
+			}
+			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skipCdcpb(dAtA[iNdEx:])
diff --git a/proto/cdcpb.proto b/proto/cdcpb.proto
index 2a04f51cc..700d61573 100644
--- a/proto/cdcpb.proto
+++ b/proto/cdcpb.proto
@@ -38,6 +38,13 @@ message ClusterIDMismatch {
     uint64 request = 2;
 }
 
+// Congested is an error variable that
+// tells people that the TiKV-CDC is congested.
+message Congested {
+    // The region ID that triggers the congestion.
+    uint64 region_id = 1;
+}
+
 message Error {
     errorpb.NotLeader not_leader = 1;
     errorpb.RegionNotFound region_not_found = 2;
@@ -46,6 +53,7 @@ message Error {
     Compatibility compatibility = 5;
     ClusterIDMismatch cluster_id_mismatch = 6;
     errorpb.ServerIsBusy server_is_busy = 7;
+    Congested congested = 8;
 }
 
 message TxnInfo {
diff --git a/scripts/proto.lock b/scripts/proto.lock
index 02344e3e2..ebb86d492 100644
--- a/scripts/proto.lock
+++ b/scripts/proto.lock
@@ -2154,6 +2154,16 @@
               }
             ]
           },
+          {
+            "name": "Congested",
+            "fields": [
+              {
+                "id": 1,
+                "name": "region_id",
+                "type": "uint64"
+              }
+            ]
+          },
           {
             "name": "Error",
             "fields": [
@@ -2191,6 +2201,11 @@
                 "id": 7,
                 "name": "server_is_busy",
                 "type": "errorpb.ServerIsBusy"
+              },
+              {
+                "id": 8,
+                "name": "congested",
+                "type": "Congested"
               }
             ]
           },