diff --git a/supernode/daemon/mgr/cdn/manager.go b/supernode/daemon/mgr/cdn/manager.go
index d97b6f8a5..b06d1f870 100644
--- a/supernode/daemon/mgr/cdn/manager.go
+++ b/supernode/daemon/mgr/cdn/manager.go
@@ -3,6 +3,7 @@ package cdn
 import (
 	"context"
 	"crypto/md5"
+	"path"
 	"strconv"
 
 	"github.com/dragonflyoss/Dragonfly/apis/types"
@@ -32,7 +33,7 @@ type Manager struct {
 
 // NewManager returns a new Manager.
 func NewManager(cfg *config.Config, cacheStore *store.Store, progressManager mgr.ProgressMgr) (*Manager, error) {
-	rateLimiter := cutil.NewRateLimiter(cutil.TransRate(cfg.MaxBandwidth-cfg.SystemReservedBandwidth), 2)
+	rateLimiter := cutil.NewRateLimiter(cutil.TransRate(config.TransLimit(cfg.MaxBandwidth-cfg.SystemReservedBandwidth)), 2)
 	metaDataManager := newFileMetaDataManager(cacheStore)
 	pieceMD5Manager := newpieceMD5Mgr()
 	cdnReporter := newReporter(cfg, cacheStore, progressManager, metaDataManager, pieceMD5Manager)
@@ -87,14 +88,14 @@ func (cm *Manager) TriggerCDN(ctx context.Context, task *types.TaskInfo) (*types
 
 	cm.updateLastModifiedAndETag(ctx, task.ID, resp.Header.Get("Last-Modified"), resp.Header.Get("Etag"))
 	reader := cutil.NewLimitReaderWithLimiterAndMD5Sum(resp.Body, cm.limiter, fileMD5)
-	realFileLength, err := cm.writer.startWriter(ctx, cm.cfg, reader, task, startPieceNum, httpFileLength, pieceContSize)
+	downloadMetadata, err := cm.writer.startWriter(ctx, cm.cfg, reader, task, startPieceNum, httpFileLength, pieceContSize)
 	if err != nil {
 		logrus.Errorf("failed to write for task %s: %v", task.ID, err)
 		return nil, err
 	}
 
 	realMD5 := reader.Md5()
-	success, err := cm.handleCDNResult(ctx, task, realMD5, httpFileLength, realFileLength)
+	success, err := cm.handleCDNResult(ctx, task, realMD5, httpFileLength, downloadMetadata.realHTTPFileLength)
 	if err != nil || success == false {
 		return &types.TaskInfo{
 			CdnStatus: types.TaskInfoCdnStatusFAILED,
@@ -103,18 +104,16 @@ func (cm *Manager) TriggerCDN(ctx context.Context, task *types.TaskInfo) (*types
 
 	return &types.TaskInfo{
 		CdnStatus:  types.TaskInfoCdnStatusSUCCESS,
-		FileLength: realFileLength,
+		FileLength: downloadMetadata.realFileLength,
 		RealMd5:    realMD5,
 	}, nil
 }
 
 // GetHTTPPath returns the http download path of taskID.
+// The returned path joined the DownloadRaw.Bucket and DownloadRaw.Key.
 func (cm *Manager) GetHTTPPath(ctx context.Context, taskID string) (string, error) {
-	info, err := cm.cacheStore.Stat(ctx, getDownloadRawFunc(taskID))
-	if err != nil {
-		return "", err
-	}
-	return info.Path, nil
+	raw := getDownloadRawFunc(taskID)
+	return path.Join("/", raw.Bucket, raw.Key), nil
 }
 
 // GetStatus get the status of the file.
diff --git a/supernode/daemon/mgr/cdn/super_writer.go b/supernode/daemon/mgr/cdn/super_writer.go
index 813cb667e..2ecb5fa7e 100644
--- a/supernode/daemon/mgr/cdn/super_writer.go
+++ b/supernode/daemon/mgr/cdn/super_writer.go
@@ -21,6 +21,12 @@ type protocolContent struct {
 	pieceContent     *bytes.Buffer
 }
 
+type downloadMetadata struct {
+	realFileLength     int64
+	realHTTPFileLength int64
+	pieceCount         int
+}
+
 type superWriter struct {
 	cdnStore    *store.Store
 	cdnReporter *reporter
@@ -35,9 +41,11 @@ func newSuperWriter(cdnStore *store.Store, cdnReporter *reporter) *superWriter {
 
 // startWriter writes the stream data from the reader to the underlying storage.
 func (cw *superWriter) startWriter(ctx context.Context, cfg *config.Config, reader io.Reader,
-	task *types.TaskInfo, startPieceNum int, httpFileLength int64, pieceContSize int32) (int64, error) {
+	task *types.TaskInfo, startPieceNum int, httpFileLength int64, pieceContSize int32) (*downloadMetadata, error) {
 	// realFileLength is used to caculate the file Length dynamically
-	realFileLength := int64(startPieceNum) * int64(pieceContSize)
+	realFileLength := int64(startPieceNum) * int64(task.PieceSize)
+	// realHTTPFileLength is used to caculate the http file Length dynamically
+	realHTTPFileLength := int64(startPieceNum) * int64(pieceContSize)
 	// the left size of data for a complete piece
 	pieceContLeft := pieceContSize
 	// the pieceNum currently processed
@@ -57,6 +65,7 @@ func (cw *superWriter) startWriter(ctx context.Context, cfg *config.Config, read
 		if n > 0 {
 			logrus.Debugf("success to read content with length: %d", n)
 			realFileLength += int64(n)
+			realHTTPFileLength += int64(n)
 			if int(pieceContLeft) <= n {
 				bb.Write(buf[:pieceContLeft])
 				pc := &protocolContent{
@@ -104,11 +113,15 @@ func (cw *superWriter) startWriter(ctx context.Context, cfg *config.Config, read
 		}
 		if e != nil {
 			close(jobCh)
-			return 0, e
+			return nil, e
 		}
 	}
 
 	close(jobCh)
 	wg.Wait()
-	return realFileLength, nil
+	return &downloadMetadata{
+		realFileLength:     realFileLength,
+		realHTTPFileLength: realHTTPFileLength,
+		pieceCount:         curPieceNum,
+	}, nil
 }
diff --git a/supernode/daemon/mgr/cdn/super_writer_test.go b/supernode/daemon/mgr/cdn/super_writer_test.go
index 3d8edf2f5..b56e6ba2a 100644
--- a/supernode/daemon/mgr/cdn/super_writer_test.go
+++ b/supernode/daemon/mgr/cdn/super_writer_test.go
@@ -73,9 +73,9 @@ func (s *SuperWriterTestSuite) TestStartWriter(c *check.C) {
 	pieceCount := (httpFileLen + int64(pieceContSize-1)) / int64(pieceContSize)
 	expectedSize := httpFileLen + pieceCount*int64(config.PieceWrapSize)
 
-	realFileLength, err := s.writer.startWriter(context.TODO(), nil, f, task, 0, httpFileLen, pieceContSize)
+	downloadMetadata, err := s.writer.startWriter(context.TODO(), nil, f, task, 0, httpFileLen, pieceContSize)
 	c.Check(err, check.IsNil)
-	c.Check(realFileLength, check.Equals, expectedSize)
+	c.Check(downloadMetadata.realFileLength, check.Equals, expectedSize)
 	checkFileSize(s.writer.cdnStore, task.ID, expectedSize, c)
 }
 
diff --git a/supernode/daemon/mgr/progress/progress_util.go b/supernode/daemon/mgr/progress/progress_util.go
index 6170045f7..59cff9f55 100644
--- a/supernode/daemon/mgr/progress/progress_util.go
+++ b/supernode/daemon/mgr/progress/progress_util.go
@@ -74,7 +74,10 @@ func updateRunningPiece(dstPIDMap *cutil.SyncMap, srcCID, dstPID string, pieceNu
 		return dstPIDMap.Add(pieceNumString, dstPID)
 	}
 
-	if _, err := dstPIDMap.Get(pieceNumString); err != nil && errorType.IsDataNotFound(err) {
+	if _, err := dstPIDMap.Get(pieceNumString); err != nil {
+		if errorType.IsDataNotFound(err) {
+			return nil
+		}
 		return err
 	}