diff --git a/go/storage/volume_replicate.go b/go/storage/volume_replicate.go
index f40cf60da..00b9cd14e 100644
--- a/go/storage/volume_replicate.go
+++ b/go/storage/volume_replicate.go
@@ -63,14 +63,18 @@ func ScanDirtyData(indexFileContent []byte) (dirtys DirtyDatas) {
 }
 
 func (cr *CleanReader) Seek(offset int64, whence int) (int64, error) {
-	off, e := cr.DataFile.Seek(0, 1)
+	oldOff, e := cr.DataFile.Seek(0, 1)
 	if e != nil {
-		return 0, nil
+		return 0, e
+	}
+	newOff, e := cr.DataFile.Seek(offset, whence)
+	if e != nil {
+		return 0, e
 	}
-	if off != offset {
-		cr.Close()
+	if oldOff != newOff {
+		cr.closePipe(true)
 	}
-	return cr.DataFile.Seek(offset, whence)
+	return newOff, nil
 }
 
 func (cr *CleanReader) Size() (int64, error) {
@@ -125,7 +129,7 @@ func (cdr *CleanReader) WriteTo(w io.Writer) (written int64, err error) {
 			}
 			if sz <= 0 {
 				// copy until eof
-				n, e = io.Copy(w, cdr.DataFile);
+				n, e = io.Copy(w, cdr.DataFile)
 				written += n
 				return
 			}
@@ -149,13 +153,15 @@ func (cr *CleanReader) Read(p []byte) (int, error) {
 }
 
 func (cr *CleanReader) Close() (e error) {
-	cr.mutex.Lock()
-	defer cr.mutex.Unlock()
-	cr.closePipe()
+	cr.closePipe(true)
 	return cr.DataFile.Close()
 }
 
-func (cr *CleanReader) closePipe() (e error) {
+func (cr *CleanReader) closePipe(lock bool) (e error) {
+	if lock {
+		cr.mutex.Lock()
+		defer cr.mutex.Unlock()
+	}
 	if cr.pr != nil {
 		if err := cr.pr.Close(); err != nil {
 			e = err
@@ -177,7 +183,7 @@ func (cr *CleanReader) getPipeReader() io.Reader {
 	if cr.pr != nil && cr.pw != nil {
 		return cr.pr
 	}
-	cr.closePipe()
+	cr.closePipe(false)
 	cr.pr, cr.pw = io.Pipe()
 	go func(pw *io.PipeWriter) {
 		_, e := cr.WriteTo(pw)
@@ -193,7 +199,7 @@ func (v *Volume) GetVolumeCleanReader() (cr *CleanReader, err error) {
 	} else {
 		dirtys = ScanDirtyData(indexData)
 	}
-	dataFile, e := os.Open(v.FileName()+".dat")
+	dataFile, e := os.Open(v.FileName() + ".dat")
 
 	if e != nil {
 		return nil, e
diff --git a/go/weed/weed_server/volume_server_handlers_replicate.go b/go/weed/weed_server/volume_server_handlers_replicate.go
index c8b429a7b..411967326 100644
--- a/go/weed/weed_server/volume_server_handlers_replicate.go
+++ b/go/weed/weed_server/volume_server_handlers_replicate.go
@@ -2,10 +2,11 @@ package weed_server
 
 import (
 	"fmt"
+	"io"
 	"net/http"
 	"strconv"
+
 	"github.com/chrislusf/seaweedfs/go/glog"
-	"io"
 	"github.com/pierrec/lz4"
 )
 
@@ -26,16 +27,17 @@ func (vs *VolumeServer) getVolumeCleanDataHandler(w http.ResponseWriter, r *http
 		return
 	}
 	w.Header().Set("Accept-Ranges", "bytes")
-	w.Header().Set("Content-Encoding", "lz4")
 	w.Header().Set("Content-Disposition", fmt.Sprintf(`filename="%d.dat.lz4"`, v.Id))
-	lz4w := lz4.NewWriter(w)
-	defer lz4w.Close()
+
 	rangeReq := r.Header.Get("Range")
 	if rangeReq == "" {
 		w.Header().Set("Content-Length", strconv.FormatInt(totalSize, 10))
+		w.Header().Set("Content-Encoding", "lz4")
+		lz4w := lz4.NewWriter(w)
 		if _, e = io.Copy(lz4w, cr); e != nil {
 			glog.V(4).Infoln("response write error:", e)
 		}
+		lz4w.Close()
 		return
 	}
 	ranges, e := parseRange(rangeReq, totalSize)
@@ -49,13 +51,16 @@ func (vs *VolumeServer) getVolumeCleanDataHandler(w http.ResponseWriter, r *http
 	}
 	ra := ranges[0]
 	if _, e := cr.Seek(ra.start, 0); e != nil {
-		http.Error(w, fmt.Sprintf("Seek: %v", e), http.StatusInternalServerError)
+		http.Error(w, e.Error(), http.StatusInternalServerError)
 		return
 	}
 	w.Header().Set("Content-Length", strconv.FormatInt(ra.length, 10))
 	w.Header().Set("Content-Range", ra.contentRange(totalSize))
+	w.Header().Set("Content-Encoding", "lz4")
 	w.WriteHeader(http.StatusPartialContent)
+	lz4w := lz4.NewWriter(w)
 	if _, e = io.CopyN(lz4w, cr, ra.length); e != nil {
 		glog.V(2).Infoln("response write error:", e)
 	}
+	lz4w.Close()
 }