diff --git a/client/daemon/peer/peertask_conductor.go b/client/daemon/peer/peertask_conductor.go
index 5f96dc383..b16b18d59 100644
--- a/client/daemon/peer/peertask_conductor.go
+++ b/client/daemon/peer/peertask_conductor.go
@@ -63,8 +63,6 @@ const (
 	failedReasonNotSet = "unknown"
 )
 
-var errPeerPacketChanged = errors.New("peer packet changed")
-
 var _ Task = (*peerTaskConductor)(nil)
 
 // peerTaskConductor will fetch all pieces from other peers and send pieces info to broker
@@ -112,15 +110,7 @@ type peerTaskConductor struct {
 
 	// peerPacketStream stands schedulerclient.PeerPacketStream from scheduler
 	peerPacketStream schedulerv1.Scheduler_ReportPieceResultClient
-	// peerPacket is the latest available peers from peerPacketCh
-	// Deprecated: remove in future release
-	peerPacket      atomic.Value // *schedulerv1.PeerPacket
-	legacyPeerCount *atomic.Int64
-	// peerPacketReady will receive a ready signal for peerPacket ready
-	peerPacketReady chan bool
-	// pieceTaskPoller pulls piece task from other peers
-	// Deprecated: pieceTaskPoller is deprecated, use pieceTaskSyncManager
-	pieceTaskPoller *pieceTaskPoller
+	legacyPeerCount  *atomic.Int64
 	// pieceTaskSyncManager syncs piece task from other peers
 	pieceTaskSyncManager *pieceTaskSyncManager
 
@@ -134,9 +124,6 @@ type peerTaskConductor struct {
 	// span stands open telemetry trace span
 	span trace.Span
 
-	// failedPieceCh will hold all pieces which download failed,
-	// those pieces will be retried later
-	failedPieceCh chan int32
 	// failedReason will be set when peer task failed
 	failedReason string
 	// failedReason will be set when peer task failed
@@ -230,7 +217,6 @@ func (ptm *peerTaskManager) newPeerTaskConductor(
 		ctx:                 ctx,
 		ctxCancel:           cancel,
 		broker:              newPieceBroker(),
-		peerPacketReady:     make(chan bool, 1),
 		peerID:              request.PeerId,
 		taskID:              taskID,
 		successCh:           make(chan struct{}),
@@ -240,7 +226,6 @@ func (ptm *peerTaskManager) newPeerTaskConductor(
 		readyPieces:         NewBitmap(),
 		runningPieces:       NewBitmap(),
 		requestedPieces:     NewBitmap(),
-		failedPieceCh:       make(chan int32, config.DefaultPieceChanSize),
 		failedReason:        failedReasonNotSet,
 		failedCode:          commonv1.Code_UnknownError,
 		contentLength:       atomic.NewInt64(-1),
@@ -256,11 +241,6 @@ func (ptm *peerTaskManager) newPeerTaskConductor(
 		rg:                  rg,
 	}
 
-	ptc.pieceTaskPoller = &pieceTaskPoller{
-		getPiecesMaxRetry: ptm.GetPiecesMaxRetry,
-		peerTaskConductor: ptc,
-	}
-
 	ptc.pieceDownloadCtx, ptc.pieceDownloadCancel = context.WithCancel(ptc.ctx)
 
 	return ptc
@@ -505,23 +485,6 @@ func (pt *peerTaskConductor) cancelNotRegisterred(code commonv1.Code, reason str
 // only use when receive back source code from scheduler
 func (pt *peerTaskConductor) markBackSource() {
 	pt.needBackSource.Store(true)
-	// when close peerPacketReady, pullPiecesFromPeers will invoke backSource
-	close(pt.peerPacketReady)
-	// let legacy mode exit
-	pt.peerPacket.Store(&schedulerv1.PeerPacket{
-		TaskId:        pt.taskID,
-		SrcPid:        pt.peerID,
-		ParallelCount: 1,
-		MainPeer:      nil,
-		CandidatePeers: []*schedulerv1.PeerPacket_DestPeer{
-			{
-				Ip:      pt.PeerHost.Ip,
-				RpcPort: pt.PeerHost.RpcPort,
-				PeerId:  pt.peerID,
-			},
-		},
-		Code: commonv1.Code_SchedNeedBackSource,
-	})
 }
 
 // only use when legacy get piece from peers schedule timeout
@@ -593,7 +556,6 @@ func (pt *peerTaskConductor) pullPiecesWithP2P() {
 		pieceRequestQueue: pieceRequestQueue,
 		workers:           map[string]*pieceTaskSynchronizer{},
 	}
-	go pt.pullPiecesFromPeers(pieceRequestQueue)
 	pt.receivePeerPacket(pieceRequestQueue)
 }
 
@@ -701,6 +663,7 @@ func (pt *peerTaskConductor) receivePeerPacket(pieceRequestQueue ring.Queue[Down
 		peerPacket          *schedulerv1.PeerPacket
 		err                 error
 		firstPacketReceived bool
+		firstPacketDone     = make(chan bool)
 	)
 	// only record first schedule result
 	// other schedule result will record as an event in peer task span
@@ -720,6 +683,8 @@ func (pt *peerTaskConductor) receivePeerPacket(pieceRequestQueue ring.Queue[Down
 			pt.Fail()
 		}
 	}()
+
+	go pt.waitFirstPeerPacket(firstPacketDone)
 loop:
 	for {
 		select {
@@ -739,7 +704,7 @@ loop:
 		}
 		if err != nil {
 			// some errors, like commonv1.Code_SchedReregister, after reregister success,
-			// we can continue receive peer packet from the new scheduler
+			// we can continue to receive peer packet from the new scheduler
 			cont := pt.confirmReceivePeerPacketError(err)
 			if cont {
 				continue
@@ -753,7 +718,7 @@ loop:
 		pt.Debugf("receive peerPacket %v", peerPacket)
 		if peerPacket.Code != commonv1.Code_Success {
 			if peerPacket.Code == commonv1.Code_SchedNeedBackSource {
-				pt.markBackSource()
+				pt.forceBackSource()
 				pt.Infof("receive back source code")
 				return
 			}
@@ -789,38 +754,18 @@ loop:
 			firstPeerSpan.SetAttributes(config.AttributeMainPeer.String(peerPacket.MainPeer.PeerId))
 			firstPeerSpan.End()
 		}
-		// updateSynchronizer will update legacy peers to peerPacket.CandidatePeers only
-		lastNotReadyPiece = pt.updateSynchronizer(lastNotReadyPiece, peerPacket)
+
+		lastNotReadyPiece = pt.updateSynchronizers(lastNotReadyPiece, peerPacket)
 		if !firstPacketReceived {
 			// trigger legacy get piece once to avoid first schedule timeout
 			firstPacketReceived = true
-		} else if len(peerPacket.CandidatePeers) == 0 {
-			pt.Debugf("no legacy peers, skip to send peerPacketReady")
-			pt.legacyPeerCount.Store(0)
-			continue
-		}
-
-		legacyPeerCount := int64(len(peerPacket.CandidatePeers))
-		pt.Debugf("connect to %d legacy peers", legacyPeerCount)
-		pt.legacyPeerCount.Store(legacyPeerCount)
-
-		// legacy mode: update peer packet, then send peerPacketReady
-		pt.peerPacket.Store(peerPacket)
-		select {
-		case pt.peerPacketReady <- true:
-		case <-pt.successCh:
-			pt.Infof("peer task success, stop wait peer packet from scheduler")
-			break loop
-		case <-pt.failCh:
-			pt.Errorf("peer task fail, stop wait peer packet from scheduler")
-			break loop
-		default:
+			close(firstPacketDone)
 		}
 	}
 }
 
-// updateSynchronizer will convert peers to synchronizer, if failed, will update failed peers to schedulerv1.PeerPacket
-func (pt *peerTaskConductor) updateSynchronizer(lastNum int32, p *schedulerv1.PeerPacket) int32 {
+// updateSynchronizers will convert peers to synchronizer, if failed, will update failed peers to schedulerv1.PeerPacket
+func (pt *peerTaskConductor) updateSynchronizers(lastNum int32, p *schedulerv1.PeerPacket) int32 {
 	desiredPiece, ok := pt.getNextNotReadyPieceNum(lastNum)
 	if !ok {
 		pt.Infof("all pieces is ready, peer task completed, skip to synchronize")
@@ -831,10 +776,7 @@ func (pt *peerTaskConductor) updateSynchronizer(lastNum int32, p *schedulerv1.Pe
 	var peers = []*schedulerv1.PeerPacket_DestPeer{p.MainPeer}
 	peers = append(peers, p.CandidatePeers...)
 
-	legacyPeers := pt.pieceTaskSyncManager.newMultiPieceTaskSynchronizer(peers, desiredPiece)
-
-	p.MainPeer = nil
-	p.CandidatePeers = legacyPeers
+	_ = pt.pieceTaskSyncManager.syncPeers(peers, desiredPiece)
 	return desiredPiece
 }
 
@@ -854,7 +796,7 @@ func (pt *peerTaskConductor) confirmReceivePeerPacketError(err error) (cont bool
 	if ok {
 		switch de.Code {
 		case commonv1.Code_SchedNeedBackSource:
-			pt.markBackSource()
+			pt.forceBackSource()
 			pt.Infof("receive back source code")
 			return false
 		case commonv1.Code_SchedReregister:
@@ -955,98 +897,6 @@ func (pt *peerTaskConductor) pullSinglePiece() {
 	}
 }
 
-// Deprecated
-func (pt *peerTaskConductor) pullPiecesFromPeers(pieceRequestQueue ring.Queue[DownloadPieceRequest]) {
-	if ok, backSource := pt.waitFirstPeerPacket(); !ok {
-		if backSource {
-			return
-		}
-		pt.Errorf("wait first peer packet error")
-		return
-	}
-	var (
-		num   int32
-		ok    bool
-		limit uint32
-	)
-
-	// ensure first peer packet is not nil
-	peerPacket, ok := pt.peerPacket.Load().(*schedulerv1.PeerPacket)
-	if !ok {
-		pt.Warn("pull pieces canceled")
-		return
-	}
-	if len(peerPacket.CandidatePeers) == 0 {
-		num, ok = pt.waitAvailablePeerPacket()
-		if !ok {
-			return
-		}
-	}
-
-	limit = config.DefaultPieceChanSize
-loop:
-	for {
-		// 1, check whether catch exit signal or get a failed piece
-		// if nothing got, process normal pieces
-		select {
-		case <-pt.successCh:
-			pt.Infof("peer task success, stop get pieces from peer")
-			break loop
-		case <-pt.failCh:
-			pt.Error("peer task fail, stop get pieces from peer")
-			break loop
-		case failed := <-pt.failedPieceCh:
-			pt.Warnf("download piece %d failed, retry", failed)
-			num = failed
-			limit = 1
-		default:
-		}
-
-	retry:
-		// 2, try to get pieces
-		pt.Debugf("try to get pieces, number: %d, limit: %d", num, limit)
-		piecePacket, err := pt.pieceTaskPoller.preparePieceTasks(
-			&commonv1.PieceTaskRequest{
-				TaskId:   pt.taskID,
-				SrcPid:   pt.peerID,
-				StartNum: uint32(num),
-				Limit:    limit,
-			})
-
-		if err != nil {
-			pt.Warnf("get piece task error: %s, wait available peers from scheduler", err.Error())
-			pt.span.RecordError(err)
-			if num, ok = pt.waitAvailablePeerPacket(); !ok {
-				break loop
-			}
-			continue loop
-		}
-
-		pt.updateMetadata(piecePacket)
-
-		// 3. dispatch piece request to all workers
-		pt.dispatchPieceRequest(pieceRequestQueue, piecePacket)
-
-		// 4. get next not request piece
-		if num, ok = pt.getNextPieceNum(num); ok {
-			// get next piece success
-			limit = config.DefaultPieceChanSize
-			continue
-		}
-
-		// 5. wait failed pieces
-		pt.Infof("all pieces requests sent, just wait failed pieces")
-		// get failed piece
-		if num, ok = pt.waitFailedPiece(); !ok {
-			// when ok == false, indicates than need break loop
-			break loop
-		}
-		// just need one piece
-		limit = 1
-		goto retry
-	}
-}
-
 func (pt *peerTaskConductor) updateMetadata(piecePacket *commonv1.PiecePacket) {
 	// update total piece
 	var metadataChanged bool
@@ -1094,139 +944,30 @@ func (pt *peerTaskConductor) initDownloadPieceWorkers(count int32, pieceRequestQ
 	}
 }
 
-func (pt *peerTaskConductor) waitFirstPeerPacket() (done bool, backSource bool) {
+func (pt *peerTaskConductor) waitFirstPeerPacket(done chan bool) {
 	// wait first available peer
 	select {
 	case <-pt.successCh:
 		pt.Infof("peer task succeed, no need to wait first peer")
-		return true, false
+		return
 	case <-pt.failCh:
 		pt.Warnf("peer task failed, no need to wait first peer")
-		return true, false
-	case _, ok := <-pt.peerPacketReady:
-		if ok {
-			// preparePieceTasksByPeer func already send piece result with error
-			pt.Infof("new peer client ready, scheduler time cost: %dus, peer count: %d",
-				time.Since(pt.startTime).Microseconds(), len(pt.peerPacket.Load().(*schedulerv1.PeerPacket).CandidatePeers))
-			return true, false
-		}
-		// when scheduler says commonv1.Code_SchedNeedBackSource, receivePeerPacket will close pt.peerPacketReady
-		pt.Infof("start download from source due to commonv1.Code_SchedNeedBackSource")
-		pt.span.AddEvent("back source due to scheduler says need back source")
-		pt.backSource()
-		return false, true
+		return
+	case <-done:
+		pt.Debugf("first peer packet received")
+		return
 	case <-time.After(pt.SchedulerOption.ScheduleTimeout.Duration):
 		if pt.SchedulerOption.DisableAutoBackSource {
 			pt.cancel(commonv1.Code_ClientScheduleTimeout, reasonBackSourceDisabled)
 			err := fmt.Errorf("%s, auto back source disabled", pt.failedReason)
 			pt.span.RecordError(err)
 			pt.Errorf(err.Error())
-			return false, false
+			return
 		}
 		pt.Warnf("start download from source due to %s", reasonScheduleTimeout)
 		pt.span.AddEvent("back source due to schedule timeout")
 		pt.forceBackSource()
-		return false, true
-	}
-}
-
-// Deprecated
-func (pt *peerTaskConductor) waitAvailablePeerPacket() (int32, bool) {
-	// only <-pt.peerPacketReady continue loop, others break
-	select {
-	// when peer task without content length or total pieces count, match here
-	case <-pt.successCh:
-		pt.Infof("peer task success, stop wait available peer packet")
-	case <-pt.failCh:
-		pt.Infof("peer task fail, stop wait available peer packet")
-	case _, ok := <-pt.peerPacketReady:
-		if ok {
-			// preparePieceTasksByPeer func already send piece result with error
-			pt.Infof("new peer client ready, peer count: %d", len(pt.peerPacket.Load().(*schedulerv1.PeerPacket).CandidatePeers))
-			// research from piece 0
-			return 0, true
-		}
-		// when scheduler says commonv1.Code_SchedNeedBackSource, receivePeerPacket will close pt.peerPacketReady
-		pt.Infof("start download from source due to commonv1.Code_SchedNeedBackSource")
-		pt.span.AddEvent("back source due to scheduler says need back source ")
-		// TODO optimize back source when already downloaded some pieces
-		pt.backSource()
-	}
-	return -1, false
-}
-
-// Deprecated
-func (pt *peerTaskConductor) dispatchPieceRequest(pieceRequestQueue ring.Queue[DownloadPieceRequest], piecePacket *commonv1.PiecePacket) {
-	pieceCount := len(piecePacket.PieceInfos)
-	pt.Debugf("dispatch piece request, piece count: %d", pieceCount)
-	// fix cdn return zero piece info, but with total piece count and content length
-	if pieceCount == 0 {
-		finished := pt.isCompleted()
-		if finished {
-			pt.Done()
-		}
-	}
-	for _, piece := range piecePacket.PieceInfos {
-		pt.Infof("get piece %d from %s/%s, digest: %s, start: %d, size: %d",
-			piece.PieceNum, piecePacket.DstAddr, piecePacket.DstPid, piece.PieceMd5, piece.RangeStart, piece.RangeSize)
-		// FIXME when set total piece but no total digest, fetch again
-		pt.requestedPiecesLock.Lock()
-		if !pt.requestedPieces.IsSet(piece.PieceNum) {
-			pt.requestedPieces.Set(piece.PieceNum)
-		}
-		pt.requestedPiecesLock.Unlock()
-		req := &DownloadPieceRequest{
-			storage: pt.GetStorage(),
-			piece:   piece,
-			log:     pt.Log(),
-			TaskID:  pt.GetTaskID(),
-			PeerID:  pt.GetPeerID(),
-			DstPid:  piecePacket.DstPid,
-			DstAddr: piecePacket.DstAddr,
-		}
-
-		pieceRequestQueue.Enqueue(req)
-		msg := fmt.Sprintf("send piece #%d request to piece download queue", piece.PieceNum)
-		pt.span.AddEvent(msg)
-		pt.Infof(msg)
-
-		select {
-		case <-pt.successCh:
-			pt.Infof("peer task success, stop dispatch piece request")
-		case <-pt.failCh:
-			pt.Warnf("peer task fail, stop dispatch piece request")
-		default:
-		}
-	}
-}
-
-func (pt *peerTaskConductor) waitFailedPiece() (int32, bool) {
-	if pt.isCompleted() {
-		return -1, false
-	}
-wait:
-	// use no default branch select to wait failed piece or exit
-	select {
-	case <-pt.successCh:
-		pt.Infof("peer task success, stop to wait failed piece")
-		return -1, false
-	case <-pt.failCh:
-		pt.Debugf("peer task fail, stop to wait failed piece")
-		return -1, false
-	case failed := <-pt.failedPieceCh:
-		pt.Warnf("download piece/%d failed, retry", failed)
-		return failed, true
-	case _, ok := <-pt.peerPacketReady:
-		if ok {
-			// preparePieceTasksByPeer func already send piece result with error
-			pt.Infof("new peer client ready, but all pieces are already downloading, just wait failed pieces")
-			goto wait
-		}
-		// when scheduler says commonv1.Code_SchedNeedBackSource, receivePeerPacket will close pt.peerPacketReady
-		pt.Infof("start download from source due to commonv1.Code_SchedNeedBackSource")
-		pt.span.AddEvent("back source due to scheduler says need back source")
-		pt.backSource()
-		return -1, false
+		return
 	}
 }
 
@@ -1312,25 +1053,6 @@ func (pt *peerTaskConductor) downloadPiece(workerID int32, request *DownloadPiec
 			})
 		pt.Infof("send failed piece %d to remote, attempt: %d, success: %d",
 			request.piece.PieceNum, attempt, success)
-
-		// when there is no legacy peers, skip send to failedPieceCh for legacy peers in background
-		if pt.legacyPeerCount.Load() == 0 {
-			pt.Infof("there is no legacy peers, skip send to failedPieceCh for legacy peers")
-			return
-		}
-		// Deprecated
-		// send to fail chan and retry
-		// try to send directly first, if failed channel is busy, create a new goroutine to do this
-		select {
-		case pt.failedPieceCh <- request.piece.PieceNum:
-			pt.Infof("success to send failed piece %d to failedPieceCh", request.piece.PieceNum)
-		default:
-			pt.Infof("start to send failed piece %d to failedPieceCh in background", request.piece.PieceNum)
-			go func() {
-				pt.failedPieceCh <- request.piece.PieceNum
-				pt.Infof("success to send failed piece %d to failedPieceCh in background", request.piece.PieceNum)
-			}()
-		}
 		return
 	}
 	// broadcast success piece
diff --git a/client/daemon/peer/peertask_manager_test.go b/client/daemon/peer/peertask_manager_test.go
index 1eac62955..7bcd135b7 100644
--- a/client/daemon/peer/peertask_manager_test.go
+++ b/client/daemon/peer/peertask_manager_test.go
@@ -83,7 +83,6 @@ type componentsOption struct {
 	backSource         bool
 	scope              commonv1.SizeScope
 	content            []byte
-	getPieceTasks      bool
 	reregister         bool
 }
 
@@ -130,42 +129,32 @@ func setupPeerTaskManagerComponents(ctrl *gomock.Controller, opt componentsOptio
 			PieceMd5Sign:  totalDigests,
 		}
 	}
-	if opt.getPieceTasks {
-		daemon.EXPECT().GetPieceTasks(gomock.Any(), gomock.Any()).AnyTimes().
-			DoAndReturn(func(ctx context.Context, request *commonv1.PieceTaskRequest) (*commonv1.PiecePacket, error) {
-				return genPiecePacket(request), nil
-			})
-		daemon.EXPECT().SyncPieceTasks(gomock.Any()).AnyTimes().DoAndReturn(func(arg0 dfdaemonv1.Daemon_SyncPieceTasksServer) error {
-			return status.Error(codes.Unimplemented, "TODO")
+	daemon.EXPECT().GetPieceTasks(gomock.Any(), gomock.Any()).AnyTimes().
+		DoAndReturn(func(ctx context.Context, request *commonv1.PieceTaskRequest) (*commonv1.PiecePacket, error) {
+			return nil, status.Error(codes.Unimplemented, "TODO")
 		})
-	} else {
-		daemon.EXPECT().GetPieceTasks(gomock.Any(), gomock.Any()).AnyTimes().
-			DoAndReturn(func(ctx context.Context, request *commonv1.PieceTaskRequest) (*commonv1.PiecePacket, error) {
-				return nil, status.Error(codes.Unimplemented, "TODO")
-			})
-		daemon.EXPECT().SyncPieceTasks(gomock.Any()).AnyTimes().DoAndReturn(func(s dfdaemonv1.Daemon_SyncPieceTasksServer) error {
-			request, err := s.Recv()
+	daemon.EXPECT().SyncPieceTasks(gomock.Any()).AnyTimes().DoAndReturn(func(s dfdaemonv1.Daemon_SyncPieceTasksServer) error {
+		request, err := s.Recv()
+		if err != nil {
+			return err
+		}
+		if err = s.Send(genPiecePacket(request)); err != nil {
+			return err
+		}
+		for {
+			request, err = s.Recv()
+			if err == io.EOF {
+				break
+			}
 			if err != nil {
 				return err
 			}
 			if err = s.Send(genPiecePacket(request)); err != nil {
 				return err
 			}
-			for {
-				request, err = s.Recv()
-				if err == io.EOF {
-					break
-				}
-				if err != nil {
-					return err
-				}
-				if err = s.Send(genPiecePacket(request)); err != nil {
-					return err
-				}
-			}
-			return nil
-		})
-	}
+		}
+		return nil
+	})
 	ln, _ := rpc.Listen(dfnet.NetAddr{
 		Type: "tcp",
 		Addr: fmt.Sprintf("0.0.0.0:%d", port),
@@ -354,7 +343,6 @@ type testSpec struct {
 	sizeScope          commonv1.SizeScope
 	peerID             string
 	url                string
-	legacyFeature      bool
 	reregister         bool
 	// when urlGenerator is not nil, use urlGenerator instead url
 	// it's useful for httptest server
@@ -621,80 +609,76 @@ func TestPeerTaskManager_TaskSuite(t *testing.T) {
 			if _tc.runTaskTypes == nil {
 				types = taskTypes
 			}
-			assert := testifyassert.New(t)
-			require := testifyrequire.New(t)
-			for _, legacy := range []bool{true, false} {
-				for _, typ := range types {
-					// dup a new test case with the task type
-					logger.Infof("-------------------- test %s - type %s, legacy feature: %v started --------------------",
-						_tc.name, taskTypeNames[typ], legacy)
-					tc := _tc
-					tc.taskType = typ
-					tc.legacyFeature = legacy
-					func() {
-						ctrl := gomock.NewController(t)
-						defer ctrl.Finish()
-						mockContentLength := len(tc.taskData)
+			assert = testifyassert.New(t)
+			require = testifyrequire.New(t)
+			for _, typ := range types {
+				// dup a new test case with the task type
+				logger.Infof("-------------------- test %s - type %s, started --------------------",
+					_tc.name, taskTypeNames[typ])
+				tc := _tc
+				tc.taskType = typ
+				func() {
+					ctrl := gomock.NewController(t)
+					defer ctrl.Finish()
+					mockContentLength := len(tc.taskData)
 
-						urlMeta := &commonv1.UrlMeta{
-							Tag: "d7y-test",
-						}
+					urlMeta := &commonv1.UrlMeta{
+						Tag: "d7y-test",
+					}
 
-						if tc.httpRange != nil {
-							urlMeta.Range = strings.TrimLeft(tc.httpRange.String(), "bytes=")
-						}
+					if tc.httpRange != nil {
+						urlMeta.Range = strings.TrimLeft(tc.httpRange.String(), "bytes=")
+					}
 
-						if tc.urlGenerator != nil {
-							tc.url = tc.urlGenerator(&tc)
-						}
-						taskID := idgen.TaskID(tc.url, urlMeta)
+					if tc.urlGenerator != nil {
+						tc.url = tc.urlGenerator(&tc)
+					}
+					taskID := idgen.TaskID(tc.url, urlMeta)
 
-						var (
-							downloader   PieceDownloader
-							sourceClient source.ResourceClient
-						)
+					var (
+						downloader   PieceDownloader
+						sourceClient source.ResourceClient
+					)
 
-						if tc.mockPieceDownloader != nil {
-							downloader = tc.mockPieceDownloader(ctrl, tc.taskData, tc.pieceSize)
-						}
+					if tc.mockPieceDownloader != nil {
+						downloader = tc.mockPieceDownloader(ctrl, tc.taskData, tc.pieceSize)
+					}
 
-						if tc.mockHTTPSourceClient != nil {
+					if tc.mockHTTPSourceClient != nil {
+						source.UnRegister("http")
+						defer func() {
+							// reset source client
 							source.UnRegister("http")
-							defer func() {
-								// reset source client
-								source.UnRegister("http")
-								require.Nil(source.Register("http", httpprotocol.NewHTTPSourceClient(), httpprotocol.Adapter))
-							}()
-							// replace source client
-							sourceClient = tc.mockHTTPSourceClient(t, ctrl, tc.httpRange, tc.taskData, tc.url)
-							require.Nil(source.Register("http", sourceClient, httpprotocol.Adapter))
-						}
+							require.Nil(source.Register("http", httpprotocol.NewHTTPSourceClient(), httpprotocol.Adapter))
+						}()
+						// replace source client
+						sourceClient = tc.mockHTTPSourceClient(t, ctrl, tc.httpRange, tc.taskData, tc.url)
+						require.Nil(source.Register("http", sourceClient, httpprotocol.Adapter))
+					}
 
-						option := componentsOption{
-							taskID:             taskID,
-							contentLength:      int64(mockContentLength),
-							pieceSize:          uint32(tc.pieceSize),
-							pieceParallelCount: tc.pieceParallelCount,
-							pieceDownloader:    downloader,
-							sourceClient:       sourceClient,
-							content:            tc.taskData,
-							scope:              tc.sizeScope,
-							peerPacketDelay:    tc.peerPacketDelay,
-							backSource:         tc.backSource,
-							getPieceTasks:      tc.legacyFeature,
-							reregister:         tc.reregister,
-						}
-						// keep peer task running in enough time to check "getOrCreatePeerTaskConductor" always return same
-						if tc.taskType == taskTypeConductor {
-							option.peerPacketDelay = []time.Duration{time.Second}
-						}
-						mm := setupMockManager(ctrl, &tc, option)
-						defer mm.CleanUp()
+					option := componentsOption{
+						taskID:             taskID,
+						contentLength:      int64(mockContentLength),
+						pieceSize:          uint32(tc.pieceSize),
+						pieceParallelCount: tc.pieceParallelCount,
+						pieceDownloader:    downloader,
+						sourceClient:       sourceClient,
+						content:            tc.taskData,
+						scope:              tc.sizeScope,
+						peerPacketDelay:    tc.peerPacketDelay,
+						backSource:         tc.backSource,
+						reregister:         tc.reregister,
+					}
+					// keep peer task running in enough time to check "getOrCreatePeerTaskConductor" always return same
+					if tc.taskType == taskTypeConductor {
+						option.peerPacketDelay = []time.Duration{time.Second}
+					}
+					mm := setupMockManager(ctrl, &tc, option)
+					defer mm.CleanUp()
 
-						tc.run(assert, require, mm, urlMeta)
-					}()
-					logger.Infof("-------------------- test %s - type %s, finished --------------------", _tc.name, taskTypeNames[typ])
-				}
+					tc.run(assert, require, mm, urlMeta)
+				}()
+				logger.Infof("-------------------- test %s - type %s, finished --------------------", _tc.name, taskTypeNames[typ])
 			}
 		})
 	}
diff --git a/client/daemon/peer/peertask_piecetask_poller.go b/client/daemon/peer/peertask_piecetask_poller.go
deleted file mode 100644
index 8b3936a17..000000000
--- a/client/daemon/peer/peertask_piecetask_poller.go
+++ /dev/null
@@ -1,261 +0,0 @@
-/*
- *     Copyright 2022 The Dragonfly Authors
- *
- * 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,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package peer
-
-import (
-	"context"
-	"fmt"
-	"time"
-
-	"go.opentelemetry.io/otel/trace"
-	"google.golang.org/grpc/codes"
-	"google.golang.org/grpc/status"
-
-	commonv1 "d7y.io/api/pkg/apis/common/v1"
-	schedulerv1 "d7y.io/api/pkg/apis/scheduler/v1"
-
-	"d7y.io/dragonfly/v2/client/config"
-	"d7y.io/dragonfly/v2/internal/dferrors"
-	"d7y.io/dragonfly/v2/pkg/dfnet"
-	"d7y.io/dragonfly/v2/pkg/retry"
-	dfdaemonclient "d7y.io/dragonfly/v2/pkg/rpc/dfdaemon/client"
-)
-
-type pieceTaskPoller struct {
-	peerTaskConductor *peerTaskConductor
-	// getPiecesMaxRetry stands max retry to get pieces from one peer packet
-	getPiecesMaxRetry int
-}
-
-func (poller *pieceTaskPoller) preparePieceTasks(request *commonv1.PieceTaskRequest) (pp *commonv1.PiecePacket, err error) {
-	ptc := poller.peerTaskConductor
-	defer ptc.recoverFromPanic()
-	var retryCount int
-prepare:
-	retryCount++
-	poller.peerTaskConductor.Debugf("prepare piece tasks, retry count: %d", retryCount)
-	peerPacket := ptc.peerPacket.Load().(*schedulerv1.PeerPacket)
-
-	if poller.peerTaskConductor.needBackSource.Load() {
-		return nil, fmt.Errorf("need back source")
-	}
-
-	for _, peer := range peerPacket.CandidatePeers {
-		if poller.peerTaskConductor.needBackSource.Load() {
-			return nil, fmt.Errorf("need back source")
-		}
-
-		request.DstPid = peer.PeerId
-		pp, err = poller.preparePieceTasksByPeer(peerPacket, peer, request)
-		if err == nil {
-			return
-		}
-		if err == errPeerPacketChanged {
-			if poller.getPiecesMaxRetry > 0 && retryCount > poller.getPiecesMaxRetry {
-				err = fmt.Errorf("get pieces max retry count reached")
-				return
-			}
-			goto prepare
-		}
-	}
-	return
-}
-
-func (poller *pieceTaskPoller) preparePieceTasksByPeer(
-	curPeerPacket *schedulerv1.PeerPacket,
-	peer *schedulerv1.PeerPacket_DestPeer, request *commonv1.PieceTaskRequest) (*commonv1.PiecePacket, error) {
-	ptc := poller.peerTaskConductor
-	if peer == nil {
-		return nil, fmt.Errorf("empty peer")
-	}
-
-	var span trace.Span
-	_, span = tracer.Start(ptc.ctx, config.SpanGetPieceTasks)
-	span.SetAttributes(config.AttributeTargetPeerID.String(peer.PeerId))
-	span.SetAttributes(config.AttributeGetPieceStartNum.Int(int(request.StartNum)))
-	span.SetAttributes(config.AttributeGetPieceLimit.Int(int(request.Limit)))
-	defer span.End()
-
-	var maxRetries = 60
-	// when cdn returns commonv1.Code_CDNTaskNotFound, report it to scheduler and wait cdn download it.
-retry:
-	ptc.Debugf("try get piece task from peer %s, piece num: %d, limit: %d\"", peer.PeerId, request.StartNum, request.Limit)
-	p, err := poller.getPieceTasksByPeer(span, curPeerPacket, peer, request)
-	if err == nil {
-		ptc.Infof("get piece task from peer %s ok, pieces length: %d, totalPiece: %d, content length: %d, piece md5 sign: %s",
-			peer.PeerId, len(p.PieceInfos), p.TotalPiece, p.ContentLength, p.PieceMd5Sign)
-		span.SetAttributes(config.AttributeGetPieceCount.Int(len(p.PieceInfos)))
-		return p, nil
-	}
-	span.RecordError(err)
-	if err == errPeerPacketChanged {
-		return nil, err
-	}
-	ptc.Debugf("get piece task error: %s", err)
-
-	// grpc error
-	if se, ok := err.(interface{ GRPCStatus() *status.Status }); ok {
-		ptc.Debugf("get piece task with grpc error, code: %d", se.GRPCStatus().Code())
-		// context canceled, just exit
-		if se.GRPCStatus().Code() == codes.Canceled {
-			span.AddEvent("context canceled")
-			ptc.Warnf("get piece task from peer %s canceled: %s", peer.PeerId, err)
-			return nil, err
-		}
-	}
-	code := commonv1.Code_ClientPieceRequestFail
-	// not grpc error
-	if de, ok := err.(*dferrors.DfError); ok && uint32(de.Code) > uint32(codes.Unauthenticated) {
-		ptc.Debugf("get piece task from peer %s with df error, code: %d", peer.PeerId, de.Code)
-		code = de.Code
-	}
-	ptc.Errorf("get piece task from peer %s error: %s, code: %d", peer.PeerId, err, code)
-	sendError := ptc.sendPieceResult(&schedulerv1.PieceResult{
-		TaskId:        ptc.taskID,
-		SrcPid:        ptc.peerID,
-		DstPid:        peer.PeerId,
-		PieceInfo:     &commonv1.PieceInfo{},
-		Success:       false,
-		Code:          code,
-		HostLoad:      nil,
-		FinishedCount: -1,
-	})
-	// error code should be sent to scheduler and the scheduler can schedule a new peer
-	if sendError != nil {
-		ptc.cancel(commonv1.Code_SchedError, sendError.Error())
-		span.RecordError(sendError)
-		ptc.Errorf("send piece result error: %s, code to send: %d", sendError, code)
-		return nil, sendError
-	}
-
-	// currently, before cdn gc tasks, it did not notify scheduler, when cdn complains Code_CDNTaskNotFound, retry
-	if maxRetries > 0 && code == commonv1.Code_CDNTaskNotFound && curPeerPacket == ptc.peerPacket.Load().(*schedulerv1.PeerPacket) {
-		span.AddEvent("retry for CdnTaskNotFound")
-		time.Sleep(time.Second)
-		maxRetries--
-		goto retry
-	}
-	return nil, err
-}
-
-func (poller *pieceTaskPoller) getPieceTasksByPeer(
-	span trace.Span,
-	curPeerPacket *schedulerv1.PeerPacket,
-	peer *schedulerv1.PeerPacket_DestPeer,
-	request *commonv1.PieceTaskRequest) (*commonv1.PiecePacket, error) {
-	var (
-		peerPacketChanged bool
-		count             int
-		ptc               = poller.peerTaskConductor
-	)
-	p, _, err := retry.Run(ptc.ctx, 0.05, 0.2, 40, func() (any, bool, error) {
-		// GetPieceTasks must be fast, so short time out is okay
-		ctx, cancel := context.WithTimeout(ptc.ctx, 4*time.Second)
-		defer cancel()
-
-		netAddr := &dfnet.NetAddr{
-			Type: dfnet.TCP,
-			Addr: fmt.Sprintf("%s:%d", peer.Ip, peer.RpcPort),
-		}
-		client, err := dfdaemonclient.GetInsecureClient(context.Background(), netAddr.String())
-		if err != nil {
-			ptc.Errorf("get dfdaemon client error: %s", err)
-			span.RecordError(err)
-			return nil, true, err
-		}
-
-		piecePacket, getError := client.GetPieceTasks(ctx, request)
-		// when GetPieceTasks returns err, exit retry
-		if getError != nil {
-			ptc.Errorf("get piece tasks with error: %s", getError)
-			span.RecordError(getError)
-
-			// fast way 1 to exit retry
-			if de, ok := getError.(*dferrors.DfError); ok {
-				ptc.Debugf("get piece task with grpc error, code: %d", de.Code)
-				// bad request, like invalid piece num, just exit
-				if de.Code == commonv1.Code_BadRequest {
-					span.AddEvent("bad request")
-					ptc.Warnf("get piece task from peer %s canceled: %s", peer.PeerId, getError)
-					return nil, true, getError
-				}
-			}
-
-			// fast way 2 to exit retry
-			lastPeerPacket := ptc.peerPacket.Load().(*schedulerv1.PeerPacket)
-			if curPeerPacket.CandidatePeers[0].PeerId != lastPeerPacket.CandidatePeers[0].PeerId {
-				ptc.Warnf("get piece tasks with error: %s, but peer packet changed, switch to new peer packet, current destPeer %s, new destPeer %s", getError,
-					curPeerPacket.CandidatePeers[0].PeerId, lastPeerPacket.CandidatePeers[0].PeerId)
-				peerPacketChanged = true
-				return nil, true, nil
-			}
-			return nil, true, getError
-		}
-		// got any pieces
-		if len(piecePacket.PieceInfos) > 0 {
-			return piecePacket, false, nil
-		}
-		// need update metadata
-		if piecePacket.ContentLength > ptc.GetContentLength() || piecePacket.TotalPiece > ptc.GetTotalPieces() {
-			return piecePacket, false, nil
-		}
-		// invalid request num
-		if piecePacket.TotalPiece > -1 && uint32(piecePacket.TotalPiece) <= request.StartNum {
-			ptc.Warnf("invalid start num: %d, total piece: %d", request.StartNum, piecePacket.TotalPiece)
-			return piecePacket, false, nil
-		}
-
-		// by santong: when peer return empty, retry later
-		sendError := ptc.sendPieceResult(&schedulerv1.PieceResult{
-			TaskId:        ptc.taskID,
-			SrcPid:        ptc.peerID,
-			DstPid:        peer.PeerId,
-			PieceInfo:     &commonv1.PieceInfo{},
-			Success:       false,
-			Code:          commonv1.Code_ClientWaitPieceReady,
-			HostLoad:      nil,
-			FinishedCount: ptc.readyPieces.Settled(),
-		})
-		if sendError != nil {
-			ptc.cancel(commonv1.Code_ClientPieceRequestFail, sendError.Error())
-			span.RecordError(sendError)
-			ptc.Errorf("send piece result with commonv1.Code_ClientWaitPieceReady error: %s", sendError)
-			return nil, true, sendError
-		}
-		// fast way to exit retry
-		lastPeerPacket := ptc.peerPacket.Load().(*schedulerv1.PeerPacket)
-		if curPeerPacket.CandidatePeers[0].PeerId != lastPeerPacket.CandidatePeers[0].PeerId {
-			ptc.Warnf("get empty pieces and peer packet changed, switch to new peer packet, current destPeer %s, new destPeer %s",
-				curPeerPacket.CandidatePeers[0].PeerId, lastPeerPacket.CandidatePeers[0].PeerId)
-			peerPacketChanged = true
-			return nil, true, nil
-		}
-		count++
-		span.AddEvent("retry due to empty pieces",
-			trace.WithAttributes(config.AttributeGetPieceRetry.Int(count)))
-		ptc.Infof("peer %s returns success but with empty pieces, retry later", peer.PeerId)
-		return nil, false, dferrors.ErrEmptyValue
-	})
-	if peerPacketChanged {
-		return nil, errPeerPacketChanged
-	}
-
-	if err == nil {
-		return p.(*commonv1.PiecePacket), nil
-	}
-	return nil, err
-}
diff --git a/client/daemon/peer/peertask_piecetask_synchronizer.go b/client/daemon/peer/peertask_piecetask_synchronizer.go
index 87a77176b..0d4d7a103 100644
--- a/client/daemon/peer/peertask_piecetask_synchronizer.go
+++ b/client/daemon/peer/peertask_piecetask_synchronizer.go
@@ -75,29 +75,39 @@ type pieceTaskSynchronizerError struct {
 }
 
 // FIXME for compatibility, sync will be called after the dfdaemonclient.GetPieceTasks deprecated and the pieceTaskPoller removed
-func (s *pieceTaskSyncManager) sync(pp *schedulerv1.PeerPacket, desiredPiece int32) error {
+func (s *pieceTaskSyncManager) syncPeers(destPeers []*schedulerv1.PeerPacket_DestPeer, desiredPiece int32) error {
+	s.Lock()
+	defer func() {
+		if s.peerTaskConductor.WatchdogTimeout > 0 {
+			s.resetWatchdog(destPeers[0])
+		}
+		s.Unlock()
+	}()
+
 	var (
 		peers = map[string]bool{}
 		errs  []error
 	)
-	peers[pp.MainPeer.PeerId] = true
+
 	// TODO if the worker failed, reconnect and retry
-	s.Lock()
-	defer s.Unlock()
-	if _, ok := s.workers[pp.MainPeer.PeerId]; !ok {
-		err := s.newPieceTaskSynchronizer(s.ctx, pp.MainPeer, desiredPiece)
-		if err != nil {
-			s.peerTaskConductor.Errorf("main peer SyncPieceTasks error: %s", err)
-			errs = append(errs, err)
-		}
-	}
-	for _, p := range pp.CandidatePeers {
-		peers[p.PeerId] = true
-		if _, ok := s.workers[p.PeerId]; !ok {
-			err := s.newPieceTaskSynchronizer(s.ctx, p, desiredPiece)
-			if err != nil {
-				s.peerTaskConductor.Errorf("candidate peer SyncPieceTasks error: %s", err)
-				errs = append(errs, err)
+	for _, peer := range destPeers {
+		peers[peer.PeerId] = true
+		if _, ok := s.workers[peer.PeerId]; !ok {
+			err := s.newPieceTaskSynchronizer(s.ctx, peer, desiredPiece)
+			if err == nil {
+				s.peerTaskConductor.Infof("connected to peer: %s", peer.PeerId)
+				continue
+			}
+
+			// other errors, report to scheduler
+			if errors.Is(err, context.DeadlineExceeded) {
+				// connect timeout error, report to scheduler to get more available peers
+				s.reportInvalidPeer(peer, commonv1.Code_ClientConnectionError)
+				s.peerTaskConductor.Infof("connect peer %s with error: %s", peer.PeerId, err)
+			} else {
+				// other errors, report to scheduler to get more available peers
+				s.reportInvalidPeer(peer, commonv1.Code_ClientPieceRequestFail)
+				s.peerTaskConductor.Errorf("connect peer %s error: %s", peer.PeerId, err)
 			}
 		}
 	}
@@ -224,47 +234,6 @@ func (s *pieceTaskSyncManager) newPieceTaskSynchronizer(
 	return nil
 }
 
-func (s *pieceTaskSyncManager) newMultiPieceTaskSynchronizer(
-	destPeers []*schedulerv1.PeerPacket_DestPeer,
-	desiredPiece int32) (legacyPeers []*schedulerv1.PeerPacket_DestPeer) {
-	s.Lock()
-	defer func() {
-		if s.peerTaskConductor.WatchdogTimeout > 0 {
-			s.resetWatchdog(destPeers[0])
-		}
-		s.Unlock()
-	}()
-
-	for _, peer := range destPeers {
-		err := s.newPieceTaskSynchronizer(s.ctx, peer, desiredPiece)
-		if err == nil {
-			s.peerTaskConductor.Infof("connected to peer: %s", peer.PeerId)
-			continue
-		}
-		// when err is codes.Unimplemented, fallback to legacy get piece grpc
-		stat, ok := status.FromError(err)
-		if ok && stat.Code() == codes.Unimplemented {
-			// for legacy peers, when get pieces error, will report the error
-			s.peerTaskConductor.Warnf("connect peer %s error: %s, fallback to legacy get piece grpc", peer.PeerId, err)
-			legacyPeers = append(legacyPeers, peer)
-			continue
-		}
-
-		// other errors, report to scheduler
-		if errors.Is(err, context.DeadlineExceeded) {
-			// connect timeout error, report to scheduler to get more available peers
-			s.reportInvalidPeer(peer, commonv1.Code_ClientConnectionError)
-			s.peerTaskConductor.Infof("connect to peer %s with error: %s, peer is invalid, skip legacy grpc", peer.PeerId, err)
-		} else {
-			// other errors, report to scheduler to get more available peers
-			s.reportInvalidPeer(peer, commonv1.Code_ClientPieceRequestFail)
-			s.peerTaskConductor.Errorf("connect peer %s error: %s, not codes.Unimplemented", peer.PeerId, err)
-		}
-	}
-	s.cleanStaleWorker(destPeers)
-	return legacyPeers
-}
-
 func (s *pieceTaskSyncManager) resetWatchdog(mainPeer *schedulerv1.PeerPacket_DestPeer) {
 	if s.watchdog != nil {
 		close(s.watchdog.done)
diff --git a/client/daemon/peer/peertask_stream_backsource_partial_test.go b/client/daemon/peer/peertask_stream_backsource_partial_test.go
index cdcc9475d..16abef2b4 100644
--- a/client/daemon/peer/peertask_stream_backsource_partial_test.go
+++ b/client/daemon/peer/peertask_stream_backsource_partial_test.go
@@ -35,9 +35,7 @@ import (
 	"github.com/stretchr/testify/require"
 	"go.uber.org/atomic"
 	"google.golang.org/grpc"
-	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/credentials/insecure"
-	"google.golang.org/grpc/status"
 
 	commonv1 "d7y.io/api/pkg/apis/common/v1"
 	dfdaemonv1 "d7y.io/api/pkg/apis/dfdaemon/v1"
@@ -99,8 +97,45 @@ func setupBackSourcePartialComponents(ctrl *gomock.Controller, testBytes []byte,
 			TotalPiece:    pieceCount,
 		}, nil
 	})
-	daemon.EXPECT().SyncPieceTasks(gomock.Any()).AnyTimes().DoAndReturn(func(arg0 dfdaemonv1.Daemon_SyncPieceTasksServer) error {
-		return status.Error(codes.Unimplemented, "TODO")
+	daemon.EXPECT().SyncPieceTasks(gomock.Any()).AnyTimes().DoAndReturn(func(s dfdaemonv1.Daemon_SyncPieceTasksServer) error {
+		request, err := s.Recv()
+		if err != nil {
+			return err
+		}
+		var tasks []*commonv1.PieceInfo
+		// only return first piece
+		if request.StartNum == 0 {
+			tasks = append(tasks,
+				&commonv1.PieceInfo{
+					PieceNum:    int32(request.StartNum),
+					RangeStart:  uint64(0),
+					RangeSize:   opt.pieceSize,
+					PieceMd5:    digest.MD5FromBytes(testBytes[0:opt.pieceSize]),
+					PieceOffset: 0,
+					PieceStyle:  0,
+				})
+		}
+		pp := &commonv1.PiecePacket{
+			PieceMd5Sign:  digest.SHA256FromStrings(piecesMd5...),
+			TaskId:        request.TaskId,
+			DstPid:        "peer-x",
+			PieceInfos:    tasks,
+			ContentLength: opt.contentLength,
+			TotalPiece:    pieceCount,
+		}
+		if err = s.Send(pp); err != nil {
+			return err
+		}
+		for {
+			_, err = s.Recv()
+			if err == io.EOF {
+				break
+			}
+			if err != nil {
+				return err
+			}
+		}
+		return nil
 	})
 	ln, _ := rpc.Listen(dfnet.NetAddr{
 		Type: "tcp",
diff --git a/client/daemon/peer/traffic_shaper_test.go b/client/daemon/peer/traffic_shaper_test.go
index e418329dc..7b8b193bb 100644
--- a/client/daemon/peer/traffic_shaper_test.go
+++ b/client/daemon/peer/traffic_shaper_test.go
@@ -132,10 +132,29 @@ func trafficShaperSetupPeerTaskManagerComponents(ctrl *gomock.Controller, opt tr
 	}
 	daemon.EXPECT().GetPieceTasks(gomock.Any(), gomock.Any()).AnyTimes().
 		DoAndReturn(func(ctx context.Context, request *commonv1.PieceTaskRequest) (*commonv1.PiecePacket, error) {
-			return genPiecePacket(request), nil
+			return nil, status.Error(codes.Unimplemented, "TODO")
 		})
-	daemon.EXPECT().SyncPieceTasks(gomock.Any()).AnyTimes().DoAndReturn(func(arg0 dfdaemonv1.Daemon_SyncPieceTasksServer) error {
-		return status.Error(codes.Unimplemented, "TODO")
+	daemon.EXPECT().SyncPieceTasks(gomock.Any()).AnyTimes().DoAndReturn(func(s dfdaemonv1.Daemon_SyncPieceTasksServer) error {
+		request, err := s.Recv()
+		if err != nil {
+			return err
+		}
+		if err = s.Send(genPiecePacket(request)); err != nil {
+			return err
+		}
+		for {
+			request, err = s.Recv()
+			if err == io.EOF {
+				break
+			}
+			if err != nil {
+				return err
+			}
+			if err = s.Send(genPiecePacket(request)); err != nil {
+				return err
+			}
+		}
+		return nil
 	})
 	ln, _ := rpc.Listen(dfnet.NetAddr{
 		Type: "tcp",