diff --git a/weed/storage/erasure_coding/ec_encoder.go b/weed/storage/erasure_coding/ec_encoder.go
index 7cb8064ac..9e2edf57d 100644
--- a/weed/storage/erasure_coding/ec_encoder.go
+++ b/weed/storage/erasure_coding/ec_encoder.go
@@ -26,9 +26,9 @@ const (
 // all keys are sorted in ascending order
 func WriteSortedFileFromIdx(baseFileName string, ext string) (e error) {
 
-	cm, err := readCompactMap(baseFileName)
+	nm, err := readNeedleMap(baseFileName)
 	if err != nil {
-		return fmt.Errorf("readCompactMap: %v", err)
+		return fmt.Errorf("readNeedleMap: %v", err)
 	}
 
 	ecxFile, err := os.OpenFile(baseFileName+ext, os.O_TRUNC|os.O_CREATE|os.O_WRONLY, 0644)
@@ -37,7 +37,7 @@ func WriteSortedFileFromIdx(baseFileName string, ext string) (e error) {
 	}
 	defer ecxFile.Close()
 
-	err = cm.AscendingVisit(func(value needle_map.NeedleValue) error {
+	err = nm.AscendingVisit(func(value needle_map.NeedleValue) error {
 		bytes := value.ToBytes()
 		_, writeErr := ecxFile.Write(bytes)
 		return writeErr
@@ -281,7 +281,7 @@ func rebuildEcFiles(shardHasData []bool, inputFiles []*os.File, outputFiles []*o
 
 }
 
-func readCompactMap(baseFileName string) (*needle_map.MemDb, error) {
+func readNeedleMap(baseFileName string) (*needle_map.MemDb, error) {
 	indexFile, err := os.OpenFile(baseFileName+".idx", os.O_RDONLY, 0644)
 	if err != nil {
 		return nil, fmt.Errorf("cannot read Volume Index %s.idx: %v", baseFileName, err)
diff --git a/weed/storage/erasure_coding/ec_test.go b/weed/storage/erasure_coding/ec_test.go
index 0e4aaa27c..b2c94cfd7 100644
--- a/weed/storage/erasure_coding/ec_test.go
+++ b/weed/storage/erasure_coding/ec_test.go
@@ -41,9 +41,9 @@ func TestEncodingDecoding(t *testing.T) {
 }
 
 func validateFiles(baseFileName string) error {
-	cm, err := readCompactMap(baseFileName)
+	nm, err := readNeedleMap(baseFileName)
 	if err != nil {
-		return fmt.Errorf("readCompactMap: %v", err)
+		return fmt.Errorf("readNeedleMap: %v", err)
 	}
 
 	datFile, err := os.OpenFile(baseFileName+".dat", os.O_RDONLY, 0)
@@ -60,7 +60,7 @@ func validateFiles(baseFileName string) error {
 	ecFiles, err := openEcFiles(baseFileName, true)
 	defer closeEcFiles(ecFiles)
 
-	err = cm.AscendingVisit(func(value needle_map.NeedleValue) error {
+	err = nm.AscendingVisit(func(value needle_map.NeedleValue) error {
 		return assertSame(datFile, fi.Size(), ecFiles, value.Offset, value.Size)
 	})
 	if err != nil {