diff --git a/go/stats/duration_counter_test.go b/go/stats/duration_counter_test.go
index aa9d61c87..484d97009 100644
--- a/go/stats/duration_counter_test.go
+++ b/go/stats/duration_counter_test.go
@@ -7,10 +7,10 @@ func TestRobinCounter(t *testing.T) {
 	rrc.Add(0, 1)
 	rrc.Add(50, 2)
 	if rrc.Count() != 2 {
-		t.Fatal()
+		t.Fatal("faild1")
 	}
 	if rrc.Sum() != 3 {
-		t.Fatal()
+		t.Fatal("faild2")
 	}
 	/*
 		index out of range
diff --git a/go/storage/chunked_file_reader.go b/go/storage/chunked_file_reader.go
index 637c841ee..755d2966b 100644
--- a/go/storage/chunked_file_reader.go
+++ b/go/storage/chunked_file_reader.go
@@ -96,7 +96,7 @@ func (cf *ChunkedFileReader) readLocalChunkNeedle(fid *FileId, w io.Writer, offs
 		return 0, e
 	}
 	if n.Cookie != cookie {
-		return 0, fmt.Errorf("read error: with unmaching cookie seen: %s expected: %s", cookie, n.Cookie)
+		return 0, fmt.Errorf("read error: with unmaching cookie seen: %x expected: %x", cookie, n.Cookie)
 	}
 	wn, e := w.Write(n.Data[offset:])
 	return int64(wn), e
diff --git a/go/storage/compact_map.go b/go/storage/compact_map.go
index 5271b5e9c..beb618963 100644
--- a/go/storage/compact_map.go
+++ b/go/storage/compact_map.go
@@ -121,8 +121,8 @@ type CompactMap struct {
 	lock sync.RWMutex
 }
 
-func NewCompactMap() CompactMap {
-	return CompactMap{}
+func NewCompactMap() *CompactMap {
+	return &CompactMap{}
 }
 
 func (cm *CompactMap) Set(key Key, offset uint32, size uint32) uint32 {
diff --git a/go/storage/compact_map_perf_test.go b/go/storage/compact_map_perf_test.go
index 1b429f263..79e122227 100644
--- a/go/storage/compact_map_perf_test.go
+++ b/go/storage/compact_map_perf_test.go
@@ -19,7 +19,7 @@ func TestMemoryUsage(t *testing.T) {
 
 }
 
-func LoadNewNeedleMap(file *os.File) CompactMap {
+func LoadNewNeedleMap(file *os.File) *CompactMap {
 	m := NewCompactMap()
 	bytes := make([]byte, 16*1024)
 	count, e := file.Read(bytes)
diff --git a/go/storage/needle_map.go b/go/storage/needle_map.go
index d594dd348..9e997e9ba 100644
--- a/go/storage/needle_map.go
+++ b/go/storage/needle_map.go
@@ -36,11 +36,11 @@ type NeedleMapper interface {
 type baseNeedleMapper struct {
 	indexFile           *os.File
 	mutex               sync.RWMutex
-	deletionCounter     int    `json:"DeletionCounter"`
-	fileCounter         int    `json:"FileCounter"`
-	deletionByteCounter uint64 `json:"DeletionByteCounter"`
-	fileByteCounter     uint64 `json:"FileByteCounter"`
-	maximumFileKey      uint64 `json:"MaxFileKey"`
+	deletionCounter     int
+	fileCounter         int
+	deletionByteCounter uint64
+	fileByteCounter     uint64
+	maximumFileKey      uint64
 }
 
 func (nm *baseNeedleMapper) IndexFileSize() uint64 {
diff --git a/go/storage/needle_map_memory.go b/go/storage/needle_map_memory.go
index fabbcd62d..8e244169b 100644
--- a/go/storage/needle_map_memory.go
+++ b/go/storage/needle_map_memory.go
@@ -8,7 +8,7 @@ import (
 )
 
 type NeedleMap struct {
-	m CompactMap
+	m *CompactMap
 
 	baseNeedleMapper
 }
diff --git a/go/storage/volume_info_test.go b/go/storage/volume_info_test.go
index c90ca2336..9c1a7b470 100644
--- a/go/storage/volume_info_test.go
+++ b/go/storage/volume_info_test.go
@@ -17,7 +17,7 @@ func TestSortVolumeInfos(t *testing.T) {
 	sortVolumeInfos(vis)
 	for i := 0; i < len(vis); i++ {
 		if vis[i].Id != VolumeId(i+1) {
-			t.Fatal()
+			t.Fatal("id error")
 		}
 	}
 }
diff --git a/go/storage/volume_pure_reader.go b/go/storage/volume_pure_reader.go
index a03c88327..2b35397f5 100644
--- a/go/storage/volume_pure_reader.go
+++ b/go/storage/volume_pure_reader.go
@@ -140,7 +140,6 @@ func (cdr *PureReader) WriteTo(w io.Writer) (written int64, err error) {
 			written += n
 		}
 	}
-	return
 }
 
 func (cr *PureReader) ReadAt(p []byte, off int64) (n int, err error) {
diff --git a/go/storage/volume_sync.go b/go/storage/volume_sync.go
index 7d09c873d..b1211acd5 100644
--- a/go/storage/volume_sync.go
+++ b/go/storage/volume_sync.go
@@ -48,7 +48,7 @@ optimized more later).
 func (v *Volume) Synchronize(volumeServer string) (err error) {
 	var lastCompactRevision uint16 = 0
 	var compactRevision uint16 = 0
-	var masterMap CompactMap
+	var masterMap *CompactMap
 	for i := 0; i < 3; i++ {
 		if masterMap, _, compactRevision, err = fetchVolumeFileEntries(volumeServer, v.Id); err != nil {
 			return fmt.Errorf("Failed to sync volume %d entries with %s: %v", v.Id, volumeServer, err)
@@ -77,7 +77,7 @@ func (a ByOffset) Less(i, j int) bool { return a[i].Offset < a[j].Offset }
 
 // trySynchronizing sync with remote volume server incrementally by
 // make up the local and remote delta.
-func (v *Volume) trySynchronizing(volumeServer string, masterMap CompactMap, compactRevision uint16) error {
+func (v *Volume) trySynchronizing(volumeServer string, masterMap *CompactMap, compactRevision uint16) error {
 	slaveIdxFile, err := os.Open(v.nm.IndexFileName())
 	if err != nil {
 		return fmt.Errorf("Open volume %d index file: %v", v.Id, err)
@@ -137,7 +137,7 @@ func (v *Volume) trySynchronizing(volumeServer string, masterMap CompactMap, com
 	return nil
 }
 
-func fetchVolumeFileEntries(volumeServer string, vid VolumeId) (m CompactMap, lastOffset uint64, compactRevision uint16, err error) {
+func fetchVolumeFileEntries(volumeServer string, vid VolumeId) (m *CompactMap, lastOffset uint64, compactRevision uint16, err error) {
 	m = NewCompactMap()
 
 	syncStatus, err := operation.GetVolumeSyncStatus(volumeServer, vid.String())
diff --git a/go/util/http_util.go b/go/util/http_util.go
index 7a395aca6..2fbd76fb9 100644
--- a/go/util/http_util.go
+++ b/go/util/http_util.go
@@ -179,7 +179,6 @@ func GetBufferStream(url string, values url.Values, allocatedBytes []byte, eachB
 			return err
 		}
 	}
-	return nil
 }
 
 func GetUrlStream(url string, values url.Values, readFn func(io.Reader) error) error {