From 1ac60769de5f21aee217d4aff047648d96d2d1d6 Mon Sep 17 00:00:00 2001
From: lance6716 <lance6716@gmail.com>
Date: Mon, 8 Mar 2021 17:16:39 +0800
Subject: [PATCH 1/7] dmctl, scheduler: support manually transfer-source

---
 dm/master/scheduler/scheduler.go      |  64 +++
 dm/master/scheduler/scheduler_test.go |  93 +++-
 dm/master/server.go                   |  20 +
 dm/pb/dmmaster.pb.go                  | 706 +++++++++++++++++++++-----
 dm/proto/dmmaster.proto               |  12 +
 go.mod                                |   2 +-
 go.sum                                |   5 +
 pkg/ha/bound.go                       |  14 +
 8 files changed, 799 insertions(+), 117 deletions(-)

diff --git a/dm/master/scheduler/scheduler.go b/dm/master/scheduler/scheduler.go
index 72e047f45c..30c86dbc58 100644
--- a/dm/master/scheduler/scheduler.go
+++ b/dm/master/scheduler/scheduler.go
@@ -15,10 +15,12 @@ package scheduler
 
 import (
 	"context"
+	"errors"
 	"sort"
 	"sync"
 	"time"
 
+	"github.com/pingcap/failpoint"
 	"go.etcd.io/etcd/clientv3"
 	"go.uber.org/zap"
 
@@ -351,6 +353,68 @@ func (s *Scheduler) GetSourceCfgByID(source string) *config.SourceConfig {
 	return &clone
 }
 
+// TransferSource unbinds the source and binds it to a free worker. If fails halfway, the old worker should try recover
+func (s *Scheduler) TransferSource(source, worker string) error {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	if !s.started {
+		return terror.ErrSchedulerNotStarted.Generate()
+	}
+
+	// 1. check existence.or no need
+	if _, ok := s.sourceCfgs[source]; !ok {
+		return terror.ErrSchedulerSourceCfgExist.Generate(source)
+	}
+	w, ok := s.workers[worker]
+	if !ok {
+		return terror.ErrSchedulerWorkerNotExist.Generate(worker)
+	}
+	oldWorker, hasOldWorker := s.bounds[source]
+	if hasOldWorker && oldWorker.BaseInfo().Name == worker {
+		return nil
+	}
+
+	// 2. check new worker is free
+	stage := w.Stage()
+	if stage != WorkerFree {
+		return terror.ErrSchedulerWorkerInvalidTrans.Generate(worker, stage, WorkerBound)
+	}
+
+	// 3. deal with old worker
+	if !hasOldWorker {
+		s.logger.Warn("in transfer source, found a free worker and not bound source, which should not happened",
+			zap.String("source", source),
+			zap.String("worker", worker))
+		// 3.1 bound it directly
+		err := s.boundSourceToWorker(source, w)
+		if err == nil {
+			delete(s.unbounds, source)
+		}
+		return err
+	}
+
+	defer func() {
+		_, err := s.tryBoundForWorker(oldWorker)
+		if err != nil {
+			s.logger.Warn("in transfer source, error when try bound the old worker", zap.Error(err))
+		}
+	}()
+
+	// 4. replace the source bound
+	failpoint.Inject("failToReplaceSourceBound", func(_ failpoint.Value) {
+		failpoint.Return(errors.New("failToPutSourceBound"))
+	})
+	_, err := ha.ReplaceSourceBound(s.etcdCli, source, oldWorker.BaseInfo().Name, worker)
+	if err != nil {
+		return err
+	}
+	oldWorker.ToFree()
+	// we have checked w.stage is free, so there should not be an error
+	_ = s.updateStatusForBound(w, ha.NewSourceBound(source, worker))
+	return nil
+}
+
 // AddSubTasks adds the information of one or more subtasks for one task.
 func (s *Scheduler) AddSubTasks(cfgs ...config.SubTaskConfig) error {
 	s.mu.Lock()
diff --git a/dm/master/scheduler/scheduler_test.go b/dm/master/scheduler/scheduler_test.go
index 5ced30a348..3914cd1565 100644
--- a/dm/master/scheduler/scheduler_test.go
+++ b/dm/master/scheduler/scheduler_test.go
@@ -20,6 +20,7 @@ import (
 	"time"
 
 	. "github.com/pingcap/check"
+	"github.com/pingcap/failpoint"
 	"go.etcd.io/etcd/clientv3"
 	v3rpc "go.etcd.io/etcd/etcdserver/api/v3rpc/rpctypes"
 	"go.etcd.io/etcd/integration"
@@ -1008,7 +1009,7 @@ func (t *testScheduler) TestLastBound(c *C) {
 	c.Assert(err, IsNil)
 	c.Assert(bounded, IsFalse)
 
-	// after worker3 become offline, worker2 should be bounded to worker2
+	// after worker3 become offline, source2 should be bounded to worker2
 	s.updateStatusForUnbound(sourceID2)
 	_, ok := s.bounds[sourceID2]
 	c.Assert(ok, IsFalse)
@@ -1018,3 +1019,93 @@ func (t *testScheduler) TestLastBound(c *C) {
 	c.Assert(bounded, IsTrue)
 	c.Assert(s.bounds[sourceID2], DeepEquals, worker2)
 }
+
+func (t *testScheduler) TestTransferSource(c *C) {
+	defer clearTestInfoOperation(c)
+
+	var (
+		logger      = log.L()
+		s           = NewScheduler(&logger, config.Security{})
+		sourceID1   = "mysql-replica-1"
+		sourceID2   = "mysql-replica-2"
+		sourceID3   = "mysql-replica-3"
+		sourceID4   = "mysql-replica-4"
+		workerName1 = "dm-worker-1"
+		workerName2 = "dm-worker-2"
+		workerName3 = "dm-worker-3"
+		workerName4 = "dm-worker-4"
+	)
+
+	worker1 := &Worker{baseInfo: ha.WorkerInfo{Name: workerName1}}
+	worker2 := &Worker{baseInfo: ha.WorkerInfo{Name: workerName2}}
+	worker3 := &Worker{baseInfo: ha.WorkerInfo{Name: workerName3}}
+	worker4 := &Worker{baseInfo: ha.WorkerInfo{Name: workerName4}}
+
+	// step 1: start an empty scheduler
+	s.started = true
+	s.etcdCli = etcdTestCli
+	s.workers[workerName1] = worker1
+	s.workers[workerName2] = worker2
+	s.workers[workerName3] = worker3
+	s.workers[workerName4] = worker4
+	s.sourceCfgs[sourceID1] = config.SourceConfig{}
+	s.sourceCfgs[sourceID2] = config.SourceConfig{}
+
+	worker1.ToFree()
+	c.Assert(s.boundSourceToWorker(sourceID1, worker1), IsNil)
+	worker2.ToFree()
+	c.Assert(s.boundSourceToWorker(sourceID2, worker2), IsNil)
+
+	c.Assert(s.bounds[sourceID1], DeepEquals, worker1)
+	c.Assert(s.bounds[sourceID2], DeepEquals, worker2)
+
+	worker3.ToFree()
+	worker4.ToFree()
+
+	// test invalid transfer: source not exists
+	c.Assert(s.TransferSource("not-exist", workerName3), NotNil)
+
+	// test valid transfer: source -> worker = bound -> free
+	c.Assert(s.TransferSource(sourceID1, workerName4), IsNil)
+	c.Assert(s.bounds[sourceID1], DeepEquals, worker4)
+	c.Assert(worker1.Stage(), Equals, WorkerFree)
+
+	// test valid transfer: source -> worker = unbound -> free
+	s.sourceCfgs[sourceID3] = config.SourceConfig{}
+	s.unbounds[sourceID3] = struct{}{}
+	c.Assert(s.TransferSource(sourceID3, workerName3), IsNil)
+	c.Assert(s.bounds[sourceID3], DeepEquals, worker3)
+
+	// test valid transfer: self
+	c.Assert(s.TransferSource(sourceID3, workerName3), IsNil)
+	c.Assert(s.bounds[sourceID3], DeepEquals, worker3)
+
+	// test invalid transfer: source -> worker = bound -> bound
+	c.Assert(s.TransferSource(sourceID1, workerName3), NotNil)
+	c.Assert(s.bounds[sourceID1], DeepEquals, worker4)
+	c.Assert(s.bounds[sourceID3], DeepEquals, worker3)
+
+	// test invalid transfer: source -> worker = bound -> offline
+	worker1.ToOffline()
+	c.Assert(s.TransferSource(sourceID1, workerName1), NotNil)
+	c.Assert(s.bounds[sourceID1], DeepEquals, worker4)
+
+	// test invalid transfer: source -> worker = unbound -> bound
+	s.sourceCfgs[sourceID4] = config.SourceConfig{}
+	s.unbounds[sourceID4] = struct{}{}
+	c.Assert(s.TransferSource(sourceID4, workerName3), NotNil)
+	c.Assert(s.bounds[sourceID3], DeepEquals, worker3)
+	delete(s.unbounds, sourceID4)
+	delete(s.sourceCfgs, sourceID4)
+
+	worker1.ToFree()
+	// now we have (worker1, nil) (worker2, source2) (worker3, source3) (worker4, source1)
+
+	// test fail halfway won't left old worker unbound
+	c.Assert(failpoint.Enable("github.com/pingcap/dm/dm/master/scheduler/failToReplaceSourceBound", `return()`), IsNil)
+	//nolint:errcheck
+	defer failpoint.Disable("github.com/pingcap/dm/dm/master/scheduler/failToReplaceSourceBound")
+	c.Assert(s.TransferSource(sourceID1, workerName1), NotNil)
+	c.Assert(s.bounds[sourceID1], DeepEquals, worker4)
+	c.Assert(worker1.Stage(), Equals, WorkerFree)
+}
diff --git a/dm/master/server.go b/dm/master/server.go
index 4645349842..3fcc2d6490 100644
--- a/dm/master/server.go
+++ b/dm/master/server.go
@@ -1982,6 +1982,26 @@ func (s *Server) HandleError(ctx context.Context, req *pb.HandleErrorRequest) (*
 	}, nil
 }
 
+// TransferSource implements MasterServer.TransferSource
+func (s *Server) TransferSource(ctx context.Context, req *pb.TransferSourceRequest) (*pb.TransferSourceResponse, error) {
+	var (
+		resp2 *pb.TransferSourceResponse
+		err2  error
+	)
+	shouldRet := s.sharedLogic(ctx, req, &resp2, &err2)
+	if shouldRet {
+		return resp2, err2
+	}
+
+	err := s.scheduler.TransferSource(req.Source, req.Worker)
+	if err != nil {
+		resp2.Msg = err.Error()
+		return resp2, nil
+	}
+	resp2.Result = true
+	return resp2, nil
+}
+
 // sharedLogic does some shared logic for each RPC implementation
 // arguments with `Pointer` suffix should be pointer to that variable its name indicated
 // return `true` means caller should return with variable that `xxPointer` modified
diff --git a/dm/pb/dmmaster.pb.go b/dm/pb/dmmaster.pb.go
index 91233745d7..60b75b1a55 100644
--- a/dm/pb/dmmaster.pb.go
+++ b/dm/pb/dmmaster.pb.go
@@ -2829,6 +2829,110 @@ func (m *HandleErrorResponse) GetSources() []*CommonWorkerResponse {
 	return nil
 }
 
+type TransferSourceRequest struct {
+	Source string `protobuf:"bytes,1,opt,name=source,proto3" json:"source,omitempty"`
+	Worker string `protobuf:"bytes,2,opt,name=worker,proto3" json:"worker,omitempty"`
+}
+
+func (m *TransferSourceRequest) Reset()         { *m = TransferSourceRequest{} }
+func (m *TransferSourceRequest) String() string { return proto.CompactTextString(m) }
+func (*TransferSourceRequest) ProtoMessage()    {}
+func (*TransferSourceRequest) Descriptor() ([]byte, []int) {
+	return fileDescriptor_f9bef11f2a341f03, []int{45}
+}
+func (m *TransferSourceRequest) XXX_Unmarshal(b []byte) error {
+	return m.Unmarshal(b)
+}
+func (m *TransferSourceRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	if deterministic {
+		return xxx_messageInfo_TransferSourceRequest.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 *TransferSourceRequest) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_TransferSourceRequest.Merge(m, src)
+}
+func (m *TransferSourceRequest) XXX_Size() int {
+	return m.Size()
+}
+func (m *TransferSourceRequest) XXX_DiscardUnknown() {
+	xxx_messageInfo_TransferSourceRequest.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_TransferSourceRequest proto.InternalMessageInfo
+
+func (m *TransferSourceRequest) GetSource() string {
+	if m != nil {
+		return m.Source
+	}
+	return ""
+}
+
+func (m *TransferSourceRequest) GetWorker() string {
+	if m != nil {
+		return m.Worker
+	}
+	return ""
+}
+
+type TransferSourceResponse struct {
+	Result bool   `protobuf:"varint,1,opt,name=result,proto3" json:"result,omitempty"`
+	Msg    string `protobuf:"bytes,2,opt,name=msg,proto3" json:"msg,omitempty"`
+}
+
+func (m *TransferSourceResponse) Reset()         { *m = TransferSourceResponse{} }
+func (m *TransferSourceResponse) String() string { return proto.CompactTextString(m) }
+func (*TransferSourceResponse) ProtoMessage()    {}
+func (*TransferSourceResponse) Descriptor() ([]byte, []int) {
+	return fileDescriptor_f9bef11f2a341f03, []int{46}
+}
+func (m *TransferSourceResponse) XXX_Unmarshal(b []byte) error {
+	return m.Unmarshal(b)
+}
+func (m *TransferSourceResponse) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	if deterministic {
+		return xxx_messageInfo_TransferSourceResponse.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 *TransferSourceResponse) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_TransferSourceResponse.Merge(m, src)
+}
+func (m *TransferSourceResponse) XXX_Size() int {
+	return m.Size()
+}
+func (m *TransferSourceResponse) XXX_DiscardUnknown() {
+	xxx_messageInfo_TransferSourceResponse.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_TransferSourceResponse proto.InternalMessageInfo
+
+func (m *TransferSourceResponse) GetResult() bool {
+	if m != nil {
+		return m.Result
+	}
+	return false
+}
+
+func (m *TransferSourceResponse) GetMsg() string {
+	if m != nil {
+		return m.Msg
+	}
+	return ""
+}
+
 func init() {
 	proto.RegisterEnum("pb.SourceOp", SourceOp_name, SourceOp_value)
 	proto.RegisterEnum("pb.LeaderOp", LeaderOp_name, LeaderOp_value)
@@ -2878,130 +2982,134 @@ func init() {
 	proto.RegisterType((*GetMasterCfgResponse)(nil), "pb.GetMasterCfgResponse")
 	proto.RegisterType((*HandleErrorRequest)(nil), "pb.HandleErrorRequest")
 	proto.RegisterType((*HandleErrorResponse)(nil), "pb.HandleErrorResponse")
+	proto.RegisterType((*TransferSourceRequest)(nil), "pb.TransferSourceRequest")
+	proto.RegisterType((*TransferSourceResponse)(nil), "pb.TransferSourceResponse")
 }
 
 func init() { proto.RegisterFile("dmmaster.proto", fileDescriptor_f9bef11f2a341f03) }
 
 var fileDescriptor_f9bef11f2a341f03 = []byte{
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+	// 1920 bytes of a gzipped FileDescriptorProto
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 }
 
 // Reference imports to suppress errors if they are not otherwise used.
@@ -3048,6 +3156,7 @@ type MasterClient interface {
 	GetCfg(ctx context.Context, in *GetCfgRequest, opts ...grpc.CallOption) (*GetCfgResponse, error)
 	HandleError(ctx context.Context, in *HandleErrorRequest, opts ...grpc.CallOption) (*HandleErrorResponse, error)
 	GetMasterCfg(ctx context.Context, in *GetMasterCfgRequest, opts ...grpc.CallOption) (*GetMasterCfgResponse, error)
+	TransferSource(ctx context.Context, in *TransferSourceRequest, opts ...grpc.CallOption) (*TransferSourceResponse, error)
 }
 
 type masterClient struct {
@@ -3229,6 +3338,15 @@ func (c *masterClient) GetMasterCfg(ctx context.Context, in *GetMasterCfgRequest
 	return out, nil
 }
 
+func (c *masterClient) TransferSource(ctx context.Context, in *TransferSourceRequest, opts ...grpc.CallOption) (*TransferSourceResponse, error) {
+	out := new(TransferSourceResponse)
+	err := c.cc.Invoke(ctx, "/pb.Master/TransferSource", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 // MasterServer is the server API for Master service.
 type MasterServer interface {
 	StartTask(context.Context, *StartTaskRequest) (*StartTaskResponse, error)
@@ -3263,6 +3381,7 @@ type MasterServer interface {
 	GetCfg(context.Context, *GetCfgRequest) (*GetCfgResponse, error)
 	HandleError(context.Context, *HandleErrorRequest) (*HandleErrorResponse, error)
 	GetMasterCfg(context.Context, *GetMasterCfgRequest) (*GetMasterCfgResponse, error)
+	TransferSource(context.Context, *TransferSourceRequest) (*TransferSourceResponse, error)
 }
 
 // UnimplementedMasterServer can be embedded to have forward compatible implementations.
@@ -3326,6 +3445,9 @@ func (*UnimplementedMasterServer) HandleError(ctx context.Context, req *HandleEr
 func (*UnimplementedMasterServer) GetMasterCfg(ctx context.Context, req *GetMasterCfgRequest) (*GetMasterCfgResponse, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method GetMasterCfg not implemented")
 }
+func (*UnimplementedMasterServer) TransferSource(ctx context.Context, req *TransferSourceRequest) (*TransferSourceResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method TransferSource not implemented")
+}
 
 func RegisterMasterServer(s *grpc.Server, srv MasterServer) {
 	s.RegisterService(&_Master_serviceDesc, srv)
@@ -3673,6 +3795,24 @@ func _Master_GetMasterCfg_Handler(srv interface{}, ctx context.Context, dec func
 	return interceptor(ctx, in, info, handler)
 }
 
+func _Master_TransferSource_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(TransferSourceRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(MasterServer).TransferSource(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/pb.Master/TransferSource",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(MasterServer).TransferSource(ctx, req.(*TransferSourceRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 var _Master_serviceDesc = grpc.ServiceDesc{
 	ServiceName: "pb.Master",
 	HandlerType: (*MasterServer)(nil),
@@ -3753,6 +3893,10 @@ var _Master_serviceDesc = grpc.ServiceDesc{
 			MethodName: "GetMasterCfg",
 			Handler:    _Master_GetMasterCfg_Handler,
 		},
+		{
+			MethodName: "TransferSource",
+			Handler:    _Master_TransferSource_Handler,
+		},
 	},
 	Streams:  []grpc.StreamDesc{},
 	Metadata: "dmmaster.proto",
@@ -5915,6 +6059,83 @@ func (m *HandleErrorResponse) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	return len(dAtA) - i, nil
 }
 
+func (m *TransferSourceRequest) 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 *TransferSourceRequest) MarshalTo(dAtA []byte) (int, error) {
+	size := m.Size()
+	return m.MarshalToSizedBuffer(dAtA[:size])
+}
+
+func (m *TransferSourceRequest) MarshalToSizedBuffer(dAtA []byte) (int, error) {
+	i := len(dAtA)
+	_ = i
+	var l int
+	_ = l
+	if len(m.Worker) > 0 {
+		i -= len(m.Worker)
+		copy(dAtA[i:], m.Worker)
+		i = encodeVarintDmmaster(dAtA, i, uint64(len(m.Worker)))
+		i--
+		dAtA[i] = 0x12
+	}
+	if len(m.Source) > 0 {
+		i -= len(m.Source)
+		copy(dAtA[i:], m.Source)
+		i = encodeVarintDmmaster(dAtA, i, uint64(len(m.Source)))
+		i--
+		dAtA[i] = 0xa
+	}
+	return len(dAtA) - i, nil
+}
+
+func (m *TransferSourceResponse) 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 *TransferSourceResponse) MarshalTo(dAtA []byte) (int, error) {
+	size := m.Size()
+	return m.MarshalToSizedBuffer(dAtA[:size])
+}
+
+func (m *TransferSourceResponse) MarshalToSizedBuffer(dAtA []byte) (int, error) {
+	i := len(dAtA)
+	_ = i
+	var l int
+	_ = l
+	if len(m.Msg) > 0 {
+		i -= len(m.Msg)
+		copy(dAtA[i:], m.Msg)
+		i = encodeVarintDmmaster(dAtA, i, uint64(len(m.Msg)))
+		i--
+		dAtA[i] = 0x12
+	}
+	if m.Result {
+		i--
+		if m.Result {
+			dAtA[i] = 1
+		} else {
+			dAtA[i] = 0
+		}
+		i--
+		dAtA[i] = 0x8
+	}
+	return len(dAtA) - i, nil
+}
+
 func encodeVarintDmmaster(dAtA []byte, offset int, v uint64) int {
 	offset -= sovDmmaster(v)
 	base := offset
@@ -6894,6 +7115,39 @@ func (m *HandleErrorResponse) Size() (n int) {
 	return n
 }
 
+func (m *TransferSourceRequest) Size() (n int) {
+	if m == nil {
+		return 0
+	}
+	var l int
+	_ = l
+	l = len(m.Source)
+	if l > 0 {
+		n += 1 + l + sovDmmaster(uint64(l))
+	}
+	l = len(m.Worker)
+	if l > 0 {
+		n += 1 + l + sovDmmaster(uint64(l))
+	}
+	return n
+}
+
+func (m *TransferSourceResponse) Size() (n int) {
+	if m == nil {
+		return 0
+	}
+	var l int
+	_ = l
+	if m.Result {
+		n += 2
+	}
+	l = len(m.Msg)
+	if l > 0 {
+		n += 1 + l + sovDmmaster(uint64(l))
+	}
+	return n
+}
+
 func sovDmmaster(x uint64) (n int) {
 	return (math_bits.Len64(x|1) + 6) / 7
 }
@@ -12941,6 +13195,228 @@ func (m *HandleErrorResponse) Unmarshal(dAtA []byte) error {
 	}
 	return nil
 }
+func (m *TransferSourceRequest) 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 ErrIntOverflowDmmaster
+			}
+			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: TransferSourceRequest: wiretype end group for non-group")
+		}
+		if fieldNum <= 0 {
+			return fmt.Errorf("proto: TransferSourceRequest: illegal tag %d (wire type %d)", fieldNum, wire)
+		}
+		switch fieldNum {
+		case 1:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Source", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowDmmaster
+				}
+				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 ErrInvalidLengthDmmaster
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex < 0 {
+				return ErrInvalidLengthDmmaster
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.Source = string(dAtA[iNdEx:postIndex])
+			iNdEx = postIndex
+		case 2:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Worker", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowDmmaster
+				}
+				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 ErrInvalidLengthDmmaster
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex < 0 {
+				return ErrInvalidLengthDmmaster
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.Worker = string(dAtA[iNdEx:postIndex])
+			iNdEx = postIndex
+		default:
+			iNdEx = preIndex
+			skippy, err := skipDmmaster(dAtA[iNdEx:])
+			if err != nil {
+				return err
+			}
+			if skippy < 0 {
+				return ErrInvalidLengthDmmaster
+			}
+			if (iNdEx + skippy) < 0 {
+				return ErrInvalidLengthDmmaster
+			}
+			if (iNdEx + skippy) > l {
+				return io.ErrUnexpectedEOF
+			}
+			iNdEx += skippy
+		}
+	}
+
+	if iNdEx > l {
+		return io.ErrUnexpectedEOF
+	}
+	return nil
+}
+func (m *TransferSourceResponse) 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 ErrIntOverflowDmmaster
+			}
+			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: TransferSourceResponse: wiretype end group for non-group")
+		}
+		if fieldNum <= 0 {
+			return fmt.Errorf("proto: TransferSourceResponse: illegal tag %d (wire type %d)", fieldNum, wire)
+		}
+		switch fieldNum {
+		case 1:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Result", wireType)
+			}
+			var v int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowDmmaster
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				v |= int(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			m.Result = bool(v != 0)
+		case 2:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Msg", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowDmmaster
+				}
+				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 ErrInvalidLengthDmmaster
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex < 0 {
+				return ErrInvalidLengthDmmaster
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.Msg = string(dAtA[iNdEx:postIndex])
+			iNdEx = postIndex
+		default:
+			iNdEx = preIndex
+			skippy, err := skipDmmaster(dAtA[iNdEx:])
+			if err != nil {
+				return err
+			}
+			if skippy < 0 {
+				return ErrInvalidLengthDmmaster
+			}
+			if (iNdEx + skippy) < 0 {
+				return ErrInvalidLengthDmmaster
+			}
+			if (iNdEx + skippy) > l {
+				return io.ErrUnexpectedEOF
+			}
+			iNdEx += skippy
+		}
+	}
+
+	if iNdEx > l {
+		return io.ErrUnexpectedEOF
+	}
+	return nil
+}
 func skipDmmaster(dAtA []byte) (n int, err error) {
 	l := len(dAtA)
 	iNdEx := 0
diff --git a/dm/proto/dmmaster.proto b/dm/proto/dmmaster.proto
index 6b2a7746ea..5121122c78 100644
--- a/dm/proto/dmmaster.proto
+++ b/dm/proto/dmmaster.proto
@@ -104,6 +104,8 @@ service Master {
     }
 
     rpc GetMasterCfg(GetMasterCfgRequest) returns(GetMasterCfgResponse) {}
+
+    rpc TransferSource(TransferSourceRequest) returns(TransferSourceResponse) {}
 }
 
 message StartTaskRequest {
@@ -423,4 +425,14 @@ message HandleErrorResponse {
     bool result = 1;
     string msg = 2;
     repeated CommonWorkerResponse sources = 3;
+}
+
+message TransferSourceRequest {
+    string source = 1;
+    string worker = 2;
+}
+
+message TransferSourceResponse {
+    bool result = 1;
+    string msg = 2;
 }
\ No newline at end of file
diff --git a/go.mod b/go.mod
index cb0c9eefc0..5027b54c05 100644
--- a/go.mod
+++ b/go.mod
@@ -10,7 +10,7 @@ require (
 	github.com/dustin/go-humanize v1.0.0
 	github.com/go-sql-driver/mysql v1.5.0
 	github.com/gogo/gateway v1.1.0
-	github.com/gogo/protobuf v1.3.1
+	github.com/gogo/protobuf v1.3.2
 	github.com/golang/mock v1.4.4
 	github.com/golang/protobuf v1.3.4
 	github.com/google/uuid v1.1.1
diff --git a/go.sum b/go.sum
index 0c0799b699..9e84a4c24f 100644
--- a/go.sum
+++ b/go.sum
@@ -370,6 +370,8 @@ github.com/gogo/protobuf v1.2.1 h1:/s5zKNz0uPFCZ5hddgPdo2TK2TVrUNMn0OOX8/aZMTE=
 github.com/gogo/protobuf v1.2.1/go.mod h1:hp+jE20tsWTFYpLwKvXlhS1hjn+gTNwPg2I6zVXpSg4=
 github.com/gogo/protobuf v1.3.1 h1:DqDEcV5aeaTmdFBePNpYsp3FlcVH/2ISVVM9Qf8PSls=
 github.com/gogo/protobuf v1.3.1/go.mod h1:SlYgWuQ5SjCEi6WLHjHCa1yvBfUnHcTbrrZtXPKa29o=
+github.com/gogo/protobuf v1.3.2 h1:Ov1cvc58UF3b5XjBnZv7+opcTcQFZebYjWzi34vdm4Q=
+github.com/gogo/protobuf v1.3.2/go.mod h1:P1XiOD3dCwIKUDQYPy72D8LYyHL2YPYrpS2s69NZV8Q=
 github.com/gohxs/readline v0.0.0-20171011095936-a780388e6e7c/go.mod h1:9S/fKAutQ6wVHqm1jnp9D9sc5hu689s9AaTWFS92LaU=
 github.com/golang-sql/civil v0.0.0-20190719163853-cb61b32ac6fe/go.mod h1:8vg3r2VgvsThLBIFL93Qb5yWzgyZWhEmBwUJWevAkK0=
 github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0/go.mod h1:E/TSTwGwJL78qG/PmXZO1EjYhfJinVAhrmmHX6Z8B9k=
@@ -568,6 +570,7 @@ github.com/kevinburke/go-bindata v3.18.0+incompatible/go.mod h1:/pEEZ72flUW2p0yi
 github.com/kisielk/errcheck v1.1.0/go.mod h1:EZBBE59ingxPouuu3KfxchcWSUPOHkagtvWXihfKN4Q=
 github.com/kisielk/errcheck v1.2.0 h1:reN85Pxc5larApoH1keMBiu2GWtPqXQ1nc9gx+jOU+E=
 github.com/kisielk/errcheck v1.2.0/go.mod h1:/BMXB+zMLi60iA8Vv6Ksmxu/1UDYcXs4uQLJ+jE2L00=
+github.com/kisielk/errcheck v1.5.0/go.mod h1:pFxgyoBC7bSaBwPgfKdkLd5X25qrDl4LWUI2bnpBCr8=
 github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck=
 github.com/klauspost/compress v1.4.0/go.mod h1:RyIbtBH6LamlWaDj8nUwkbUhJ87Yi3uG0guNDohfE1A=
 github.com/klauspost/compress v1.9.5 h1:U+CaK85mrNNb4k8BNOfgJtJ/gr6kswUCFj6miSzVC6M=
@@ -1564,10 +1567,12 @@ golang.org/x/tools v0.0.0-20200521211927-2b542361a4fc/go.mod h1:EkVYQZoAsY45+roY
 golang.org/x/tools v0.0.0-20200527183253-8e7acdbce89d h1:SR+e35rACZFBohNb4Om1ibX6N3iO0FtdbwqGSuD9dBU=
 golang.org/x/tools v0.0.0-20200527183253-8e7acdbce89d/go.mod h1:EkVYQZoAsY45+roYkvgYkIh4xh/qjgUK9TdY2XT94GE=
 golang.org/x/tools v0.0.0-20200609164405-eb789aa7ce50/go.mod h1:EkVYQZoAsY45+roYkvgYkIh4xh/qjgUK9TdY2XT94GE=
+golang.org/x/tools v0.0.0-20200619180055-7c47624df98f/go.mod h1:EkVYQZoAsY45+roYkvgYkIh4xh/qjgUK9TdY2XT94GE=
 golang.org/x/tools v0.0.0-20200820010801-b793a1359eac/go.mod h1:njjCfa9FT2d7l9Bc6FUM5FLjQPp3cFF28FI3qnDFljA=
 golang.org/x/tools v0.0.0-20200823205832-c024452afbcd h1:KNSumuk5eGuQV7zbOrDDZ3MIkwsQr0n5oKiH4oE0/hU=
 golang.org/x/tools v0.0.0-20200823205832-c024452afbcd/go.mod h1:njjCfa9FT2d7l9Bc6FUM5FLjQPp3cFF28FI3qnDFljA=
 golang.org/x/tools v0.0.0-20201125231158-b5590deeca9b/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
+golang.org/x/tools v0.0.0-20210106214847-113979e3529a/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
 golang.org/x/tools v0.1.0 h1:po9/4sTYwZU9lPhi1tOrb4hCv3qrhiQ77LZfGa2OjwY=
 golang.org/x/tools v0.1.0/go.mod h1:xkSsbof2nBLbhDlRMhhhyNLN/zl3eTqcnHD5viDpcZ0=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
diff --git a/pkg/ha/bound.go b/pkg/ha/bound.go
index 39ce801b62..2990323693 100644
--- a/pkg/ha/bound.go
+++ b/pkg/ha/bound.go
@@ -107,6 +107,20 @@ func DeleteSourceBound(cli *clientv3.Client, workers ...string) (int64, error) {
 	return rev, err
 }
 
+// ReplaceSourceBound do delete an old bound and put a new bound in one transaction, so a bound source will not become
+// unbound because of failing halfway
+func ReplaceSourceBound(cli *clientv3.Client, source, oldWorker, newWorker string) (int64, error) {
+	ops := make([]clientv3.Op, 0, 3)
+	ops = append(ops, deleteSourceBoundOp(oldWorker))
+	op, err := putSourceBoundOp(NewSourceBound(source, newWorker))
+	if err != nil {
+		return 0, err
+	}
+	ops = append(ops, op...)
+	_, rev, err := etcdutil.DoOpsInOneTxnWithRetry(cli, ops...)
+	return rev, err
+}
+
 // GetSourceBound gets the source bound relationship for the specified DM-worker.
 // if the bound relationship for the worker name not exist, return with `err == nil`.
 // if the worker name is "", it will return all bound relationships as a map{worker-name: bound}.

From 7bb67a2f40e8e5f583a949a01cf3ad0a91cf3bb3 Mon Sep 17 00:00:00 2001
From: lance6716 <lance6716@gmail.com>
Date: Tue, 9 Mar 2021 15:58:12 +0800
Subject: [PATCH 2/7] fix some comment

---
 dm/master/scheduler/scheduler.go | 3 +--
 pkg/ha/bound.go                  | 2 +-
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/dm/master/scheduler/scheduler.go b/dm/master/scheduler/scheduler.go
index 30c86dbc58..e43b9232ba 100644
--- a/dm/master/scheduler/scheduler.go
+++ b/dm/master/scheduler/scheduler.go
@@ -362,7 +362,7 @@ func (s *Scheduler) TransferSource(source, worker string) error {
 		return terror.ErrSchedulerNotStarted.Generate()
 	}
 
-	// 1. check existence.or no need
+	// 1. check existence or no need
 	if _, ok := s.sourceCfgs[source]; !ok {
 		return terror.ErrSchedulerSourceCfgExist.Generate(source)
 	}
@@ -393,7 +393,6 @@ func (s *Scheduler) TransferSource(source, worker string) error {
 		}
 		return err
 	}
-
 	defer func() {
 		_, err := s.tryBoundForWorker(oldWorker)
 		if err != nil {
diff --git a/pkg/ha/bound.go b/pkg/ha/bound.go
index 2990323693..2ca61fb1d0 100644
--- a/pkg/ha/bound.go
+++ b/pkg/ha/bound.go
@@ -107,7 +107,7 @@ func DeleteSourceBound(cli *clientv3.Client, workers ...string) (int64, error) {
 	return rev, err
 }
 
-// ReplaceSourceBound do delete an old bound and put a new bound in one transaction, so a bound source will not become
+// ReplaceSourceBound deletes an old bound and puts a new bound in one transaction, so a bound source will not become
 // unbound because of failing halfway
 func ReplaceSourceBound(cli *clientv3.Client, source, oldWorker, newWorker string) (int64, error) {
 	ops := make([]clientv3.Op, 0, 3)

From fecce7f3fddf4249111a69db548ff63fa612bf2d Mon Sep 17 00:00:00 2001
From: lance6716 <lance6716@gmail.com>
Date: Wed, 10 Mar 2021 11:11:38 +0800
Subject: [PATCH 3/7] add dmctl interface

---
 dm/ctl/ctl.go                                 |  1 +
 dm/ctl/master/transfer_source.go              | 68 +++++++++++++++++++
 dm/master/scheduler/scheduler.go              |  2 +-
 dm/master/server.go                           |  2 +-
 .../dmctl_basic/check_list/operate_source.sh  |  1 -
 .../dmctl_basic/check_list/transfer_source.sh | 35 ++++++++++
 tests/dmctl_basic/run.sh                      | 13 +++-
 tests/ha/run.sh                               | 11 +++
 8 files changed, 128 insertions(+), 5 deletions(-)
 create mode 100644 dm/ctl/master/transfer_source.go
 create mode 100644 tests/dmctl_basic/check_list/transfer_source.sh

diff --git a/dm/ctl/ctl.go b/dm/ctl/ctl.go
index 10a856e617..fa5a6c3a2f 100644
--- a/dm/ctl/ctl.go
+++ b/dm/ctl/ctl.go
@@ -74,6 +74,7 @@ func NewRootCmd() *cobra.Command {
 		master.NewOperateSchemaCmd(),
 		master.NewGetCfgCmd(),
 		master.NewHandleErrorCmd(),
+		master.NewTransferSourceCmd(),
 	)
 	// copied from (*cobra.Command).InitDefaultHelpCmd
 	helpCmd := &cobra.Command{
diff --git a/dm/ctl/master/transfer_source.go b/dm/ctl/master/transfer_source.go
new file mode 100644
index 0000000000..02b8e90f30
--- /dev/null
+++ b/dm/ctl/master/transfer_source.go
@@ -0,0 +1,68 @@
+// Copyright 2021 PingCAP, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package master
+
+import (
+	"context"
+	"errors"
+	"os"
+
+	"github.com/pingcap/dm/dm/ctl/common"
+	"github.com/pingcap/dm/dm/pb"
+
+	"github.com/spf13/cobra"
+)
+
+// NewOperateSourceCmd creates a OperateSource command
+func NewTransferSourceCmd() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "transfer-source <source-id> <worker-id>",
+		Short: "Transfers a upstream MySQL/MariaDB source to a free worker.",
+		RunE:  transferSourceFunc,
+	}
+	return cmd
+}
+
+func transferSourceFunc(cmd *cobra.Command, _ []string) (err error) {
+	if len(cmd.Flags().Args()) != 2 {
+		cmd.SetOut(os.Stdout)
+		common.PrintCmdUsage(cmd)
+		err = errors.New("please check output to see error")
+		return
+	}
+
+	sourceID := cmd.Flags().Arg(0)
+	workerID := cmd.Flags().Arg(1)
+
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	resp := &pb.TransferSourceResponse{}
+	err = common.SendRequest(
+		ctx,
+		"TransferSource",
+		&pb.TransferSourceRequest{
+			Source: sourceID,
+			Worker: workerID,
+		},
+		&resp,
+	)
+
+	if err != nil {
+		return
+	}
+
+	common.PrettyPrintResponse(resp)
+	return
+}
diff --git a/dm/master/scheduler/scheduler.go b/dm/master/scheduler/scheduler.go
index e43b9232ba..0fecb203f0 100644
--- a/dm/master/scheduler/scheduler.go
+++ b/dm/master/scheduler/scheduler.go
@@ -364,7 +364,7 @@ func (s *Scheduler) TransferSource(source, worker string) error {
 
 	// 1. check existence or no need
 	if _, ok := s.sourceCfgs[source]; !ok {
-		return terror.ErrSchedulerSourceCfgExist.Generate(source)
+		return terror.ErrSchedulerSourceCfgNotExist.Generate(source)
 	}
 	w, ok := s.workers[worker]
 	if !ok {
diff --git a/dm/master/server.go b/dm/master/server.go
index 3fcc2d6490..6fb4bcde87 100644
--- a/dm/master/server.go
+++ b/dm/master/server.go
@@ -1985,7 +1985,7 @@ func (s *Server) HandleError(ctx context.Context, req *pb.HandleErrorRequest) (*
 // TransferSource implements MasterServer.TransferSource
 func (s *Server) TransferSource(ctx context.Context, req *pb.TransferSourceRequest) (*pb.TransferSourceResponse, error) {
 	var (
-		resp2 *pb.TransferSourceResponse
+		resp2 = &pb.TransferSourceResponse{}
 		err2  error
 	)
 	shouldRet := s.sharedLogic(ctx, req, &resp2, &err2)
diff --git a/tests/dmctl_basic/check_list/operate_source.sh b/tests/dmctl_basic/check_list/operate_source.sh
index 8c0e58c126..113923b840 100644
--- a/tests/dmctl_basic/check_list/operate_source.sh
+++ b/tests/dmctl_basic/check_list/operate_source.sh
@@ -25,4 +25,3 @@ function operate_source_invalid_op() {
         "operate-source invalid $source_conf" \
         "invalid operate" 1
 }
-
diff --git a/tests/dmctl_basic/check_list/transfer_source.sh b/tests/dmctl_basic/check_list/transfer_source.sh
new file mode 100644
index 0000000000..dee47d82ab
--- /dev/null
+++ b/tests/dmctl_basic/check_list/transfer_source.sh
@@ -0,0 +1,35 @@
+#!/bin/bash
+
+function transfer_source_empty_arg() {
+    run_dm_ctl $WORK_DIR "127.0.0.1:$MASTER_PORT" \
+        "transfer-source" \
+        "transfer-source <source-id> <worker-id>" 1
+}
+
+function transfer_source_less_arg() {
+    run_dm_ctl $WORK_DIR "127.0.0.1:$MASTER_PORT" \
+        "transfer-source source-id" \
+        "transfer-source <source-id> <worker-id>" 1
+}
+
+function transfer_source_more_arg() {
+    run_dm_ctl $WORK_DIR "127.0.0.1:$MASTER_PORT" \
+        "transfer-source source-id worker-id another-worker" \
+        "transfer-source <source-id> <worker-id>" 1
+}
+
+function transfer_source_valid() {
+    source_id=$1
+    worker_id=$2
+    run_dm_ctl $WORK_DIR "127.0.0.1:$MASTER_PORT" \
+        "transfer-source $1 $2" \
+        "\"result\": true" 1
+}
+
+function transfer_source_invalid() {
+    source_id=$1
+    worker_id=$2
+    run_dm_ctl $WORK_DIR "127.0.0.1:$MASTER_PORT" \
+        "transfer-source $1 $2" \
+        "invalid stage transformation for dm-worker $2" 1
+}
diff --git a/tests/dmctl_basic/run.sh b/tests/dmctl_basic/run.sh
index 7e25083429..51ed147d7a 100755
--- a/tests/dmctl_basic/run.sh
+++ b/tests/dmctl_basic/run.sh
@@ -67,6 +67,11 @@ function usage_and_arg_test() {
     operate_source_wrong_config_file
     operate_source_invalid_op $MYSQL1_CONF
     operate_source_stop_not_created_config $MYSQL1_CONF
+
+    echo "transfer_source_empty_arg"
+    transfer_source_empty_arg
+    transfer_source_less_arg
+    transfer_source_more_arg
 }
 
 function recover_max_binlog_size() {
@@ -130,12 +135,13 @@ function run() {
         "operate-source stop $cur/conf/source1.yaml $SOURCE_ID2" \
         "\"result\": true" 3
 
+    # ensure source1 is bound to worker1
     dmctl_operate_source create $WORK_DIR/source1.yaml $SOURCE_ID1
-    dmctl_operate_source create $WORK_DIR/source2.yaml $SOURCE_ID2
-
     run_dm_worker $WORK_DIR/worker1 $WORKER1_PORT $dm_worker1_conf
     check_rpc_alive $cur/../bin/check_worker_online 127.0.0.1:$WORKER1_PORT
 
+    dmctl_operate_source create $WORK_DIR/source2.yaml $SOURCE_ID2
+
     run_dm_ctl $WORK_DIR "127.0.0.1:$MASTER_PORT" \
         "operate-source show" \
         "\"result\": true" 3 \
@@ -178,6 +184,9 @@ function run() {
         "\"stage\": \"Running\"" 4
     # update_task_not_paused $TASK_CONF
 
+    transfer_source_valid $SOURCE_ID1 worker1 # transfer to self
+    transfer_source_invalid $SOURCE_ID1 worker2
+
     echo "get_config"
     get_config_wrong_arg
     get_config_to_file
diff --git a/tests/ha/run.sh b/tests/ha/run.sh
index 647783c6da..dce949264b 100755
--- a/tests/ha/run.sh
+++ b/tests/ha/run.sh
@@ -88,6 +88,17 @@ function run() {
     echo "wait and check task running"
     check_http_alive 127.0.0.1:$MASTER_PORT/apis/${API_VERSION}/status/test '"stage": "Running"' 10
 
+    # manually transfer a exist source to a newly started worker
+    run_dm_worker $WORK_DIR/worker3 $WORKER3_PORT $cur/conf/dm-worker3.toml
+    check_rpc_alive $cur/../bin/check_worker_online 127.0.0.1:$WORKER3_PORT
+    run_dm_ctl $WORK_DIR "127.0.0.1:$MASTER_PORT" \
+        "transfer-source $SOURCE_ID1 worker3" \
+        "\"result\": true" 1
+
+    run_dm_ctl_with_retry $WORK_DIR "127.0.0.1:$MASTER_PORT" \
+        "list-member --name worker3" \
+        "$SOURCE_ID1" 1
+
     echo "query-status from all dm-master"
     run_dm_ctl_with_retry $WORK_DIR "127.0.0.1:$MASTER_PORT1" \
         "query-status test" \

From 818f92849cbd1d0a542342b3c0051a9eb1a36eef Mon Sep 17 00:00:00 2001
From: lance6716 <lance6716@gmail.com>
Date: Wed, 10 Mar 2021 13:03:17 +0800
Subject: [PATCH 4/7] fix CI

---
 dm/ctl/master/transfer_source.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dm/ctl/master/transfer_source.go b/dm/ctl/master/transfer_source.go
index 02b8e90f30..3b6574008d 100644
--- a/dm/ctl/master/transfer_source.go
+++ b/dm/ctl/master/transfer_source.go
@@ -24,7 +24,7 @@ import (
 	"github.com/spf13/cobra"
 )
 
-// NewOperateSourceCmd creates a OperateSource command
+// NewTransferSourceCmd creates a TransferSource command
 func NewTransferSourceCmd() *cobra.Command {
 	cmd := &cobra.Command{
 		Use:   "transfer-source <source-id> <worker-id>",

From 2561700e0b0565b47cbd7884b28c1d3643422160 Mon Sep 17 00:00:00 2001
From: lance6716 <lance6716@gmail.com>
Date: Wed, 10 Mar 2021 13:26:10 +0800
Subject: [PATCH 5/7] refine logic

---
 dm/master/scheduler/scheduler.go | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/dm/master/scheduler/scheduler.go b/dm/master/scheduler/scheduler.go
index 0fecb203f0..baa964ae67 100644
--- a/dm/master/scheduler/scheduler.go
+++ b/dm/master/scheduler/scheduler.go
@@ -381,24 +381,17 @@ func (s *Scheduler) TransferSource(source, worker string) error {
 		return terror.ErrSchedulerWorkerInvalidTrans.Generate(worker, stage, WorkerBound)
 	}
 
-	// 3. deal with old worker
+	// 3. if no old worker, bound it directly
 	if !hasOldWorker {
 		s.logger.Warn("in transfer source, found a free worker and not bound source, which should not happened",
 			zap.String("source", source),
 			zap.String("worker", worker))
-		// 3.1 bound it directly
 		err := s.boundSourceToWorker(source, w)
 		if err == nil {
 			delete(s.unbounds, source)
 		}
 		return err
 	}
-	defer func() {
-		_, err := s.tryBoundForWorker(oldWorker)
-		if err != nil {
-			s.logger.Warn("in transfer source, error when try bound the old worker", zap.Error(err))
-		}
-	}()
 
 	// 4. replace the source bound
 	failpoint.Inject("failToReplaceSourceBound", func(_ failpoint.Value) {
@@ -411,6 +404,12 @@ func (s *Scheduler) TransferSource(source, worker string) error {
 	oldWorker.ToFree()
 	// we have checked w.stage is free, so there should not be an error
 	_ = s.updateStatusForBound(w, ha.NewSourceBound(source, worker))
+
+	// 5. try bound the old worker
+	_, err = s.tryBoundForWorker(oldWorker)
+	if err != nil {
+		s.logger.Warn("in transfer source, error when try bound the old worker", zap.Error(err))
+	}
 	return nil
 }
 

From e12156dc73f70c0ae08e45c5220a2dece62333bb Mon Sep 17 00:00:00 2001
From: lance6716 <lance6716@gmail.com>
Date: Wed, 10 Mar 2021 14:05:39 +0800
Subject: [PATCH 6/7] fix CI

---
 tests/dmctl_command/run.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/dmctl_command/run.sh b/tests/dmctl_command/run.sh
index e8edc96bfe..15a3603606 100644
--- a/tests/dmctl_command/run.sh
+++ b/tests/dmctl_command/run.sh
@@ -6,7 +6,7 @@ cur=$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )
 source $cur/../_utils/test_prepare
 WORK_DIR=$TEST_DIR/$TEST_NAME
 
-help_cnt=34
+help_cnt=35
 
 function run() {
     # check dmctl output with help flag

From 30f87fbb3f182f6c1eb354a8f211d8a586ae2c17 Mon Sep 17 00:00:00 2001
From: lance6716 <lance6716@gmail.com>
Date: Fri, 12 Mar 2021 13:46:03 +0800
Subject: [PATCH 7/7] error when there's running task on that source

---
 _utils/terror_gen/errors_release.txt  |  1 +
 dm/master/scheduler/scheduler.go      | 19 +++++++++++++++++--
 dm/master/scheduler/scheduler_test.go |  9 +++++++--
 errors.toml                           |  6 ++++++
 pkg/terror/error_list.go              |  2 ++
 tests/dmctl_basic/run.sh              |  6 +++---
 tests/ha/run.sh                       | 11 +++++++++++
 7 files changed, 47 insertions(+), 7 deletions(-)

diff --git a/_utils/terror_gen/errors_release.txt b/_utils/terror_gen/errors_release.txt
index 57698c9304..878ff21732 100644
--- a/_utils/terror_gen/errors_release.txt
+++ b/_utils/terror_gen/errors_release.txt
@@ -490,6 +490,7 @@ ErrSchedulerSubTaskStageInvalidUpdate,[code=46015:class=dm-master:scope=internal
 ErrSchedulerSubTaskOpTaskNotExist,[code=46016:class=dm-master:scope=internal:level=medium], "Message: subtasks with name %s need to be operate not exist, Workaround: Please use `query-status` command to see tasks."
 ErrSchedulerSubTaskOpSourceNotExist,[code=46017:class=dm-master:scope=internal:level=medium], "Message: sources %v need to be operate not exist"
 ErrSchedulerTaskNotExist,[code=46018:class=scheduler:scope=internal:level=medium], "Message: task with name %s not exist, Workaround: Please use `query-status` command to see tasks."
+ErrSchedulerRequireNotRunning,[code=46019:class=scheduler:scope=internal:level=high], "Message: tasks %v on source %s should not be running, Workaround: Please use `pause-task [-s source ...] task` to pause them first"
 ErrCtlGRPCCreateConn,[code=48001:class=dmctl:scope=internal:level=high], "Message: can not create grpc connection, Workaround: Please check your network connection."
 ErrCtlInvalidTLSCfg,[code=48002:class=dmctl:scope=internal:level=medium], "Message: invalid TLS config, Workaround: Please check the `ssl-ca`, `ssl-cert` and `ssl-key` config in command line."
 ErrNotSet,[code=50000:class=not-set:scope=not-set:level=high]
diff --git a/dm/master/scheduler/scheduler.go b/dm/master/scheduler/scheduler.go
index baa964ae67..96f981ceab 100644
--- a/dm/master/scheduler/scheduler.go
+++ b/dm/master/scheduler/scheduler.go
@@ -393,7 +393,22 @@ func (s *Scheduler) TransferSource(source, worker string) error {
 		return err
 	}
 
-	// 4. replace the source bound
+	// 4. if there's old worker, make sure it's not running
+	var runningTasks []string
+	for task, subtaskM := range s.expectSubTaskStages {
+		subtaskStage, ok2 := subtaskM[source]
+		if !ok2 {
+			continue
+		}
+		if subtaskStage.Expect == pb.Stage_Running {
+			runningTasks = append(runningTasks, task)
+		}
+	}
+	if len(runningTasks) > 0 {
+		return terror.ErrSchedulerRequireNotRunning.Generate(runningTasks, source)
+	}
+
+	// 5. replace the source bound
 	failpoint.Inject("failToReplaceSourceBound", func(_ failpoint.Value) {
 		failpoint.Return(errors.New("failToPutSourceBound"))
 	})
@@ -405,7 +420,7 @@ func (s *Scheduler) TransferSource(source, worker string) error {
 	// we have checked w.stage is free, so there should not be an error
 	_ = s.updateStatusForBound(w, ha.NewSourceBound(source, worker))
 
-	// 5. try bound the old worker
+	// 6. try bound the old worker
 	_, err = s.tryBoundForWorker(oldWorker)
 	if err != nil {
 		s.logger.Warn("in transfer source, error when try bound the old worker", zap.Error(err))
diff --git a/dm/master/scheduler/scheduler_test.go b/dm/master/scheduler/scheduler_test.go
index 3914cd1565..992cdcda09 100644
--- a/dm/master/scheduler/scheduler_test.go
+++ b/dm/master/scheduler/scheduler_test.go
@@ -1103,8 +1103,13 @@ func (t *testScheduler) TestTransferSource(c *C) {
 
 	// test fail halfway won't left old worker unbound
 	c.Assert(failpoint.Enable("github.com/pingcap/dm/dm/master/scheduler/failToReplaceSourceBound", `return()`), IsNil)
-	//nolint:errcheck
-	defer failpoint.Disable("github.com/pingcap/dm/dm/master/scheduler/failToReplaceSourceBound")
+	c.Assert(s.TransferSource(sourceID1, workerName1), NotNil)
+	c.Assert(s.bounds[sourceID1], DeepEquals, worker4)
+	c.Assert(worker1.Stage(), Equals, WorkerFree)
+	c.Assert(failpoint.Disable("github.com/pingcap/dm/dm/master/scheduler/failToReplaceSourceBound"), IsNil)
+
+	// test can't transfer when there's any running task on the source
+	s.expectSubTaskStages["test"] = map[string]ha.Stage{sourceID1: {Expect: pb.Stage_Running}}
 	c.Assert(s.TransferSource(sourceID1, workerName1), NotNil)
 	c.Assert(s.bounds[sourceID1], DeepEquals, worker4)
 	c.Assert(worker1.Stage(), Equals, WorkerFree)
diff --git a/errors.toml b/errors.toml
index 710941f476..32104b2713 100644
--- a/errors.toml
+++ b/errors.toml
@@ -2950,6 +2950,12 @@ description = ""
 workaround = "Please use `query-status` command to see tasks."
 tags = ["internal", "medium"]
 
+[error.DM-scheduler-46019]
+message = "tasks %v on source %s should not be running"
+description = ""
+workaround = "Please use `pause-task [-s source ...] task` to pause them first"
+tags = ["internal", "high"]
+
 [error.DM-dmctl-48001]
 message = "can not create grpc connection"
 description = ""
diff --git a/pkg/terror/error_list.go b/pkg/terror/error_list.go
index 1f07430a23..c40f237c95 100644
--- a/pkg/terror/error_list.go
+++ b/pkg/terror/error_list.go
@@ -603,6 +603,7 @@ const (
 	codeSchedulerSubTaskOpTaskNotExist
 	codeSchedulerSubTaskOpSourceNotExist
 	codeSchedulerTaskNotExist
+	codeSchedulerRequireNotRunning
 )
 
 // dmctl error code
@@ -1192,6 +1193,7 @@ var (
 	ErrSchedulerSubTaskOpTaskNotExist     = New(codeSchedulerSubTaskOpTaskNotExist, ClassDMMaster, ScopeInternal, LevelMedium, "subtasks with name %s need to be operate not exist", "Please use `query-status` command to see tasks.")
 	ErrSchedulerSubTaskOpSourceNotExist   = New(codeSchedulerSubTaskOpSourceNotExist, ClassDMMaster, ScopeInternal, LevelMedium, "sources %v need to be operate not exist", "")
 	ErrSchedulerTaskNotExist              = New(codeSchedulerTaskNotExist, ClassScheduler, ScopeInternal, LevelMedium, "task with name %s not exist", "Please use `query-status` command to see tasks.")
+	ErrSchedulerRequireNotRunning         = New(codeSchedulerRequireNotRunning, ClassScheduler, ScopeInternal, LevelHigh, "tasks %v on source %s should not be running", "Please use `pause-task [-s source ...] task` to pause them first")
 
 	// dmctl
 	ErrCtlGRPCCreateConn = New(codeCtlGRPCCreateConn, ClassDMCtl, ScopeInternal, LevelHigh, "can not create grpc connection", "Please check your network connection.")
diff --git a/tests/dmctl_basic/run.sh b/tests/dmctl_basic/run.sh
index 51ed147d7a..a3070b83f1 100755
--- a/tests/dmctl_basic/run.sh
+++ b/tests/dmctl_basic/run.sh
@@ -157,6 +157,9 @@ function run() {
         '"worker": "worker1"' 1 \
         '"worker": "worker2"' 1
 
+    transfer_source_valid $SOURCE_ID1 worker1 # transfer to self
+    transfer_source_invalid $SOURCE_ID1 worker2
+
     echo "pause_relay_success"
     pause_relay_success
     query_status_stopped_relay
@@ -184,9 +187,6 @@ function run() {
         "\"stage\": \"Running\"" 4
     # update_task_not_paused $TASK_CONF
 
-    transfer_source_valid $SOURCE_ID1 worker1 # transfer to self
-    transfer_source_invalid $SOURCE_ID1 worker2
-
     echo "get_config"
     get_config_wrong_arg
     get_config_to_file
diff --git a/tests/ha/run.sh b/tests/ha/run.sh
index dce949264b..70b093fb63 100755
--- a/tests/ha/run.sh
+++ b/tests/ha/run.sh
@@ -90,10 +90,21 @@ function run() {
 
     # manually transfer a exist source to a newly started worker
     run_dm_worker $WORK_DIR/worker3 $WORKER3_PORT $cur/conf/dm-worker3.toml
+
+    # pause task first
     check_rpc_alive $cur/../bin/check_worker_online 127.0.0.1:$WORKER3_PORT
     run_dm_ctl $WORK_DIR "127.0.0.1:$MASTER_PORT" \
+        "transfer-source $SOURCE_ID1 worker3" \
+        "tasks \[test\] on source $SOURCE_ID1 should not be running" 1
+    run_dm_ctl $WORK_DIR "127.0.0.1:$MASTER_PORT" \
+        "pause-task -s $SOURCE_ID1 test" \
+        "\"result\": true" 2
+    run_dm_ctl_with_retry $WORK_DIR "127.0.0.1:$MASTER_PORT" \
         "transfer-source $SOURCE_ID1 worker3" \
         "\"result\": true" 1
+    run_dm_ctl $WORK_DIR "127.0.0.1:$MASTER_PORT" \
+        "resume-task -s $SOURCE_ID1 test" \
+        "\"result\": true" 2
 
     run_dm_ctl_with_retry $WORK_DIR "127.0.0.1:$MASTER_PORT" \
         "list-member --name worker3" \