diff --git a/client/config/constants_otel.go b/client/config/constants_otel.go
index 97758e76b..b5803f548 100644
--- a/client/config/constants_otel.go
+++ b/client/config/constants_otel.go
@@ -55,6 +55,7 @@ const (
 	SpanBackSource        = "client-back-source"
 	SpanFirstSchedule     = "schedule-#1"
 	SpanGetPieceTasks     = "get-piece-tasks"
+	SpanSyncPieceTasks    = "sync-piece-tasks"
 	SpanDownloadPiece     = "download-piece-#%d"
 	SpanProxy             = "proxy"
 	SpanWritePiece        = "write-piece"
diff --git a/client/daemon/peer/peertask_conductor.go b/client/daemon/peer/peertask_conductor.go
index a4ad59950..e2f19f92a 100644
--- a/client/daemon/peer/peertask_conductor.go
+++ b/client/daemon/peer/peertask_conductor.go
@@ -476,7 +476,7 @@ func (pt *peerTaskConductor) pullPieces() {
 
 func (pt *peerTaskConductor) pullPiecesWithP2P() {
 	var (
-		// keep same size with pt.failedPieceCh for avoiding dead lock
+		// keep same size with pt.failedPieceCh for avoiding deadlock
 		pieceBufferSize = uint32(config.DefaultPieceChanSize)
 		pieceRequestCh  = make(chan *DownloadPieceRequest, pieceBufferSize)
 	)
@@ -684,6 +684,8 @@ func (pt *peerTaskConductor) updateSynchronizer(lastNum int32, p *scheduler.Peer
 	num, ok := pt.getNextNotReadyPieceNum(lastNum)
 	if !ok {
 		pt.Infof("all pieces is ready, peer task completed, skip to synchronize")
+		p.MainPeer = nil
+		p.StealPeers = nil
 		return num
 	}
 	var peers = []*scheduler.PeerPacket_DestPeer{p.MainPeer}
diff --git a/client/daemon/peer/peertask_piecetask_synchronizer.go b/client/daemon/peer/peertask_piecetask_synchronizer.go
index 3515da510..8b1e90ddd 100644
--- a/client/daemon/peer/peertask_piecetask_synchronizer.go
+++ b/client/daemon/peer/peertask_piecetask_synchronizer.go
@@ -18,14 +18,17 @@ package peer
 
 import (
 	"context"
+	"fmt"
 	"io"
 	"sync"
 
 	"github.com/pkg/errors"
+	"go.opentelemetry.io/otel/trace"
 	"go.uber.org/atomic"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/status"
 
+	"d7y.io/dragonfly/v2/client/config"
 	logger "d7y.io/dragonfly/v2/internal/dflog"
 	"d7y.io/dragonfly/v2/pkg/rpc/base"
 	"d7y.io/dragonfly/v2/pkg/rpc/dfdaemon"
@@ -44,6 +47,7 @@ type pieceTaskSyncManager struct {
 
 type pieceTaskSynchronizer struct {
 	*logger.SugaredLoggerOnWith
+	span              trace.Span
 	client            dfdaemon.Daemon_SyncPieceTasksClient
 	dstPeer           *scheduler.PeerPacket_DestPeer
 	error             atomic.Value
@@ -158,7 +162,9 @@ func (s *pieceTaskSyncManager) newPieceTaskSynchronizer(
 		return err
 	}
 
+	_, span := tracer.Start(s.ctx, config.SpanSyncPieceTasks)
 	synchronizer := &pieceTaskSynchronizer{
+		span:                span,
 		peerTaskConductor:   s.peerTaskConductor,
 		pieceRequestCh:      s.pieceRequestCh,
 		client:              client,
@@ -263,7 +269,9 @@ func (s *pieceTaskSynchronizer) close() {
 	if err := s.client.CloseSend(); err != nil {
 		s.error.Store(&pieceTaskSynchronizerError{err})
 		s.Debugf("close send error: %s, dest peer: %s", err, s.dstPeer.PeerId)
+		s.span.RecordError(err)
 	}
+	s.span.End()
 }
 
 func (s *pieceTaskSynchronizer) dispatchPieceRequest(piecePacket *base.PiecePacket) {
@@ -299,6 +307,7 @@ func (s *pieceTaskSynchronizer) dispatchPieceRequest(piecePacket *base.PiecePack
 		}
 		select {
 		case s.pieceRequestCh <- req:
+			s.span.AddEvent(fmt.Sprintf("send piece #%d request", piece.PieceNum))
 		case <-s.peerTaskConductor.successCh:
 			s.Infof("peer task success, stop dispatch piece request, dest peer: %s", s.dstPeer.PeerId)
 		case <-s.peerTaskConductor.failCh:
@@ -325,7 +334,8 @@ func (s *pieceTaskSynchronizer) receive(piecePacket *base.PiecePacket) {
 	} else {
 		s.Errorf("synchronizer receives with error: %s", err)
 		s.error.Store(&pieceTaskSynchronizerError{err})
-		s.reportError()
+		s.reportError(err)
+		s.Errorf("synchronizer receives with error: %s", err)
 	}
 }
 
@@ -336,19 +346,21 @@ func (s *pieceTaskSynchronizer) acquire(request *base.PieceTaskRequest) error {
 		return err
 	}
 	err := s.client.Send(request)
+	s.span.AddEvent(fmt.Sprintf("send piece #%d request", request.StartNum))
 	if err != nil {
 		s.error.Store(&pieceTaskSynchronizerError{err})
 		if s.canceled(err) {
 			s.Debugf("synchronizer sends canceled")
 		} else {
 			s.Errorf("synchronizer sends with error: %s", err)
-			s.reportError()
+			s.reportError(err)
 		}
 	}
 	return err
 }
 
-func (s *pieceTaskSynchronizer) reportError() {
+func (s *pieceTaskSynchronizer) reportError(err error) {
+	s.span.RecordError(err)
 	sendError := s.peerTaskConductor.sendPieceResult(compositePieceResult(s.peerTaskConductor, s.dstPeer, base.Code_ClientPieceRequestFail))
 	if sendError != nil {
 		s.Errorf("sync piece info failed and send piece result with error: %s", sendError)
diff --git a/client/daemon/rpcserver/rpcserver.go b/client/daemon/rpcserver/rpcserver.go
index 474216f44..089426f07 100644
--- a/client/daemon/rpcserver/rpcserver.go
+++ b/client/daemon/rpcserver/rpcserver.go
@@ -19,6 +19,7 @@ package rpcserver
 import (
 	"context"
 	"fmt"
+	"io"
 	"math"
 	"net"
 	"os"
@@ -139,59 +140,85 @@ func (s *server) GetPieceTasks(ctx context.Context, request *base.PieceTaskReque
 }
 
 // sendExistPieces will send as much as possible pieces
-func (s *server) sendExistPieces(request *base.PieceTaskRequest, sync dfdaemongrpc.Daemon_SyncPieceTasksServer, sentMap map[int32]struct{}) (total int32, sent int, err error) {
-	return sendExistPieces(sync.Context(), s.GetPieceTasks, request, sync, sentMap, true)
+func (s *server) sendExistPieces(log *logger.SugaredLoggerOnWith, request *base.PieceTaskRequest, sync dfdaemongrpc.Daemon_SyncPieceTasksServer, sentMap map[int32]struct{}) (total int32, err error) {
+	return sendExistPieces(sync.Context(), log, s.GetPieceTasks, request, sync, sentMap, true)
 }
 
 // sendFirstPieceTasks will send as much as possible pieces, even if no available pieces
-func (s *server) sendFirstPieceTasks(request *base.PieceTaskRequest, sync dfdaemongrpc.Daemon_SyncPieceTasksServer, sentMap map[int32]struct{}) (total int32, sent int, err error) {
-	return sendExistPieces(sync.Context(), s.GetPieceTasks, request, sync, sentMap, false)
+func (s *server) sendFirstPieceTasks(log *logger.SugaredLoggerOnWith, request *base.PieceTaskRequest, sync dfdaemongrpc.Daemon_SyncPieceTasksServer, sentMap map[int32]struct{}) (total int32, err error) {
+	return sendExistPieces(sync.Context(), log, s.GetPieceTasks, request, sync, sentMap, false)
 }
 
 func (s *server) SyncPieceTasks(sync dfdaemongrpc.Daemon_SyncPieceTasksServer) error {
 	request, err := sync.Recv()
 	if err != nil {
+		logger.Errorf("receive first sync piece tasks request error: %s", err.Error())
 		return err
 	}
+	log := logger.With("taskID", request.TaskId,
+		"localPeerID", request.DstPid, "remotePeerID", request.SrcPid)
+
 	skipPieceCount := request.StartNum
 	var sentMap = make(map[int32]struct{})
+
 	// TODO if not found, try to send to peer task conductor, then download it first
-	total, sent, err := s.sendFirstPieceTasks(request, sync, sentMap)
+	total, err := s.sendFirstPieceTasks(log, request, sync, sentMap)
 	if err != nil {
+		log.Errorf("send first piece tasks error: %s", err)
 		return err
 	}
 
-	// task is done, just return
-	if int(total) == sent {
-		return nil
+	recvReminding := func() error {
+		for {
+			request, err = sync.Recv()
+			if err == io.EOF {
+				return nil
+			}
+			if err != nil {
+				logger.Errorf("receive reminding piece tasks request error: %s", err)
+				return err
+			}
+			total, err = s.sendExistPieces(log, request, sync, sentMap)
+			if err != nil {
+				logger.Errorf("send reminding piece tasks error: %s", err)
+				return err
+			}
+		}
+	}
+
+	// task is done, just receive new piece tasks requests only
+	if int(total) == len(sentMap)+int(skipPieceCount) {
+		log.Infof("all piece tasks sent, receive new piece tasks requests only")
+		return recvReminding()
 	}
 
 	// subscribe peer task message for remaining pieces
 	result, ok := s.peerTaskManager.Subscribe(request)
 	if !ok {
-		// task not found, double check for done task
-		total, sent, err = s.sendExistPieces(request, sync, sentMap)
+		// running task not found, double check for done task
+		request.StartNum = searchNextPieceNum(sentMap, skipPieceCount)
+		total, err = s.sendExistPieces(log, request, sync, sentMap)
 		if err != nil {
+			log.Errorf("send exist piece tasks error: %s", err)
 			return err
 		}
 
-		if int(total) > sent {
+		if int(total) > len(sentMap)+int(skipPieceCount) {
 			return status.Errorf(codes.Unavailable, "peer task not finish, but no running task found")
 		}
-		return nil
+		return recvReminding()
 	}
 
 	var sub = &subscriber{
-		SubscribeResult: result,
-		sync:            sync,
-		request:         request,
-		skipPieceCount:  skipPieceCount,
-		totalPieces:     total,
-		sentMap:         sentMap,
-		done:            make(chan struct{}),
-		uploadAddr:      s.uploadAddr,
-		SugaredLoggerOnWith: logger.With("taskID", request.TaskId,
-			"localPeerID", request.DstPid, "remotePeerID", request.SrcPid),
+		SubscribeResult:     result,
+		sync:                sync,
+		request:             request,
+		skipPieceCount:      skipPieceCount,
+		totalPieces:         total,
+		sentMap:             sentMap,
+		done:                make(chan struct{}),
+		uploadAddr:          s.uploadAddr,
+		SugaredLoggerOnWith: log,
 	}
 
 	go sub.receiveRemainingPieceTaskRequests()
diff --git a/client/daemon/rpcserver/rpcserver_test.go b/client/daemon/rpcserver/rpcserver_test.go
index 942c35a28..da6f812c9 100644
--- a/client/daemon/rpcserver/rpcserver_test.go
+++ b/client/daemon/rpcserver/rpcserver_test.go
@@ -48,7 +48,7 @@ func TestMain(m *testing.M) {
 	os.Exit(m.Run())
 }
 
-func TestDownloadManager_ServeDownload(t *testing.T) {
+func Test_ServeDownload(t *testing.T) {
 	assert := testifyassert.New(t)
 	ctrl := gomock.NewController(t)
 	defer ctrl.Finish()
@@ -112,7 +112,7 @@ func TestDownloadManager_ServeDownload(t *testing.T) {
 	assert.True(lastResult.Done)
 }
 
-func TestDownloadManager_ServePeer(t *testing.T) {
+func Test_ServePeer(t *testing.T) {
 	assert := testifyassert.New(t)
 	ctrl := gomock.NewController(t)
 	defer ctrl.Finish()
@@ -216,7 +216,7 @@ func TestDownloadManager_ServePeer(t *testing.T) {
 	}
 }
 
-func TestDownloadManager_SyncPieceTasks(t *testing.T) {
+func Test_SyncPieceTasks(t *testing.T) {
 	assert := testifyassert.New(t)
 	ctrl := gomock.NewController(t)
 	defer ctrl.Finish()
@@ -231,12 +231,12 @@ func TestDownloadManager_SyncPieceTasks(t *testing.T) {
 	}
 	var tests = []struct {
 		name            string
-		existTaskID     string // test for non-exists task
-		existPieces     []pieceRange
+		existTaskID     string       // test for non-exists task
+		existPieces     []pieceRange // already exist pieces in storage
+		followingPieces []pieceRange // following pieces in running task subscribe channel
 		requestPieces   []int32
 		limit           uint32
 		totalPieces     uint32
-		followingPieces []pieceRange
 		success         bool
 		verify          func(t *testing.T, assert *testifyassert.Assertions)
 	}{
@@ -253,6 +253,20 @@ func TestDownloadManager_SyncPieceTasks(t *testing.T) {
 			verify: func(t *testing.T, assert *testifyassert.Assertions) {
 			},
 		},
+		{
+			name: "already exists in storage with extra get piece request",
+			existPieces: []pieceRange{
+				{
+					start: 0,
+					end:   10,
+				},
+			},
+			totalPieces:   11,
+			requestPieces: []int32{1, 3, 5, 7},
+			success:       true,
+			verify: func(t *testing.T, assert *testifyassert.Assertions) {
+			},
+		},
 		{
 			name: "already exists in storage - large",
 			existPieces: []pieceRange{
@@ -266,6 +280,20 @@ func TestDownloadManager_SyncPieceTasks(t *testing.T) {
 			verify: func(t *testing.T, assert *testifyassert.Assertions) {
 			},
 		},
+		{
+			name: "already exists in storage - large with extra get piece request",
+			existPieces: []pieceRange{
+				{
+					start: 0,
+					end:   1000,
+				},
+			},
+			totalPieces:   1001,
+			requestPieces: []int32{1, 3, 5, 7, 100, 500, 1000},
+			success:       true,
+			verify: func(t *testing.T, assert *testifyassert.Assertions) {
+			},
+		},
 		{
 			name: "partial exists in storage",
 			existPieces: []pieceRange{
@@ -452,7 +480,6 @@ func TestDownloadManager_SyncPieceTasks(t *testing.T) {
 				}
 
 				port, client := setupPeerServerAndClient(t, s, assert, s.ServePeer)
-				defer s.peerServer.GracefulStop()
 
 				syncClient, err := client.SyncPieceTasks(
 					context.Background(),
@@ -514,6 +541,7 @@ func TestDownloadManager_SyncPieceTasks(t *testing.T) {
 				if tc.success {
 					assert.Equal(int(maxNum+1), len(total))
 				}
+				s.peerServer.GracefulStop()
 			}
 
 		})
diff --git a/client/daemon/rpcserver/subscriber.go b/client/daemon/rpcserver/subscriber.go
index 9a24510f5..fcd10231f 100644
--- a/client/daemon/rpcserver/subscriber.go
+++ b/client/daemon/rpcserver/subscriber.go
@@ -52,41 +52,56 @@ func (s *subscriber) getPieces(ctx context.Context, request *base.PieceTaskReque
 
 func sendExistPieces(
 	ctx context.Context,
+	log *logger.SugaredLoggerOnWith,
 	get func(ctx context.Context, request *base.PieceTaskRequest) (*base.PiecePacket, error),
 	request *base.PieceTaskRequest,
 	sync dfdaemon.Daemon_SyncPieceTasksServer,
-	sendMap map[int32]struct{},
-	skipSendZeroPiece bool) (total int32, sent int, err error) {
+	sentMap map[int32]struct{},
+	skipSendZeroPiece bool) (total int32, err error) {
 	if request.Limit <= 0 {
 		request.Limit = 16
 	}
+	var pp *base.PiecePacket
 	for {
-		pp, err := get(ctx, request)
+		pp, err = get(ctx, request)
 		if err != nil {
-			return -1, -1, err
+			log.Errorf("get piece error: %s", err)
+			return -1, err
 		}
 		if len(pp.PieceInfos) == 0 && skipSendZeroPiece {
-			return pp.TotalPiece, sent, nil
+			return pp.TotalPiece, nil
 		}
 		if err = sync.Send(pp); err != nil {
-			return pp.TotalPiece, sent, err
+			log.Errorf("send pieces error: %s", err)
+			return pp.TotalPiece, err
 		}
 		for _, p := range pp.PieceInfos {
-			sendMap[p.PieceNum] = struct{}{}
+			log.Infof("send ready piece %d", p.PieceNum)
+			sentMap[p.PieceNum] = struct{}{}
 		}
-		sent += len(pp.PieceInfos)
 		if uint32(len(pp.PieceInfos)) < request.Limit {
-			return pp.TotalPiece, sent, nil
+			log.Infof("sent %d pieces, total: %d", len(pp.PieceInfos), pp.TotalPiece)
+			return pp.TotalPiece, nil
 		}
 		// the get piece func always return sorted pieces, use last piece num + 1 to get more pieces
 		request.StartNum = uint32(pp.PieceInfos[request.Limit-1].PieceNum + 1)
 	}
 }
 
+func searchNextPieceNum(sentMap map[int32]struct{}, cur uint32) (nextPieceNum uint32) {
+	for i := int32(cur); ; i++ {
+		if _, ok := sentMap[i]; !ok {
+			nextPieceNum = uint32(i)
+			break
+		}
+	}
+	return nextPieceNum
+}
+
 // sendExistPieces will send as much as possible pieces
-func (s *subscriber) sendExistPieces(startNum uint32) (total int32, sent int, err error) {
+func (s *subscriber) sendExistPieces(startNum uint32) (total int32, err error) {
 	s.request.StartNum = startNum
-	return sendExistPieces(s.sync.Context(), s.getPieces, s.request, s.sync, s.sentMap, true)
+	return sendExistPieces(s.sync.Context(), s.SugaredLoggerOnWith, s.getPieces, s.request, s.sync, s.sentMap, true)
 }
 
 func (s *subscriber) receiveRemainingPieceTaskRequests() {
@@ -123,6 +138,7 @@ func (s *subscriber) receiveRemainingPieceTaskRequests() {
 			return
 		}
 		for _, p := range pp.PieceInfos {
+			s.Infof("send ready piece %d", p.PieceNum)
 			s.sentMap[p.PieceNum] = struct{}{}
 		}
 		s.Unlock()
@@ -148,14 +164,14 @@ loop:
 			s.Infof("remote SyncPieceTasks done, exit sending, local task is running")
 			return nil
 		case info := <-s.PieceInfoChannel:
+			s.Infof("receive piece info, num: %d, %v", info.Num, info.Finished)
 			// not desired piece
-			s.Debugf("receive piece info, num: %d, %v", info.Num, info.Finished)
 			if s.totalPieces > -1 && uint32(info.Num) < nextPieceNum {
 				continue
 			}
-			s.Lock()
-			total, _, err := s.sendExistPieces(uint32(info.Num))
 
+			s.Lock()
+			total, err := s.sendExistPieces(uint32(info.Num))
 			if err != nil {
 				err = s.saveError(err)
 				s.Unlock()
@@ -175,13 +191,14 @@ loop:
 			nextPieceNum = s.searchNextPieceNum(nextPieceNum)
 			s.Unlock()
 		case <-s.Success:
+			s.Infof("peer task is success, send remaining pieces")
 			s.Lock()
 			// all pieces already sent
 			if s.totalPieces > -1 && nextPieceNum == uint32(s.totalPieces) {
 				s.Unlock()
 				break loop
 			}
-			total, _, err := s.sendExistPieces(nextPieceNum)
+			total, err := s.sendExistPieces(nextPieceNum)
 			if err != nil {
 				err = s.saveError(err)
 				s.Unlock()
@@ -192,11 +209,14 @@ loop:
 			}
 			if s.totalPieces > -1 && len(s.sentMap)+int(s.skipPieceCount) != int(s.totalPieces) {
 				s.Unlock()
-				return dferrors.Newf(base.Code_ClientError, "peer task success, but can not send all pieces")
+				msg := "peer task success, but can not send all pieces"
+				s.Errorf(msg)
+				return dferrors.Newf(base.Code_ClientError, msg)
 			}
 			s.Unlock()
 			break loop
 		case <-s.Fail:
+			s.Errorf("peer task failed")
 			return dferrors.Newf(base.Code_ClientError, "peer task failed")
 		}
 	}
@@ -221,11 +241,5 @@ func (s *subscriber) saveError(err error) error {
 }
 
 func (s *subscriber) searchNextPieceNum(cur uint32) (nextPieceNum uint32) {
-	for i := int32(cur); ; i++ {
-		if _, ok := s.sentMap[i]; !ok {
-			nextPieceNum = uint32(i)
-			break
-		}
-	}
-	return nextPieceNum
+	return searchNextPieceNum(s.sentMap, cur)
 }