diff --git a/unmaintained/load_test/load_test_leveldb/load_test_leveldb.go b/unmaintained/load_test/load_test_leveldb/load_test_leveldb.go
index 518a5081c..43dfb0e21 100644
--- a/unmaintained/load_test/load_test_leveldb/load_test_leveldb.go
+++ b/unmaintained/load_test/load_test_leveldb/load_test_leveldb.go
@@ -16,7 +16,7 @@ import (
 )
 
 var (
-	dir = flag.String("dir", "./t", "directory to store level db files")
+	dir     = flag.String("dir", "./t", "directory to store level db files")
 	useHash = flag.Bool("isHash", false, "hash the path as the key")
 	dbCount = flag.Int("dbCount", 1, "the number of leveldb")
 )
@@ -36,7 +36,7 @@ func main() {
 
 	var dbs []*leveldb.DB
 	var chans []chan string
-	for d := 0 ; d < *dbCount; d++ {
+	for d := 0; d < *dbCount; d++ {
 		dbFolder := fmt.Sprintf("%s/%02d", *dir, d)
 		os.MkdirAll(dbFolder, 0755)
 		db, err := leveldb.OpenFile(dbFolder, opts)
@@ -49,9 +49,9 @@ func main() {
 	}
 
 	var wg sync.WaitGroup
-	for d := 0 ; d < *dbCount; d++ {
+	for d := 0; d < *dbCount; d++ {
 		wg.Add(1)
-		go func(d int){
+		go func(d int) {
 			defer wg.Done()
 
 			ch := chans[d]
@@ -60,14 +60,13 @@ func main() {
 			for p := range ch {
 				if *useHash {
 					insertAsHash(db, p)
-				}else{
+				} else {
 					insertAsFullPath(db, p)
 				}
 			}
 		}(d)
 	}
 
-
 	counter := int64(0)
 	lastResetTime := time.Now()
 
@@ -101,7 +100,7 @@ func main() {
 		}
 	}
 
-	for d := 0 ; d < *dbCount; d++ {
+	for d := 0; d < *dbCount; d++ {
 		close(chans[d])
 	}
 
diff --git a/unmaintained/remove_duplicate_fids/remove_duplicate_fids.go b/unmaintained/remove_duplicate_fids/remove_duplicate_fids.go
index 5716ffa90..4b37a64fb 100644
--- a/unmaintained/remove_duplicate_fids/remove_duplicate_fids.go
+++ b/unmaintained/remove_duplicate_fids/remove_duplicate_fids.go
@@ -1,92 +1,91 @@
 package main
 
 import (
-    "flag"
+	"flag"
+	"fmt"
+	"os"
+	"path/filepath"
 
-    "github.com/chrislusf/seaweedfs/weed/glog"
-    "github.com/chrislusf/seaweedfs/weed/storage"
-    "github.com/chrislusf/seaweedfs/weed/storage/needle"
-    "os"
-    "path/filepath"
-
-    "fmt"
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/storage"
+	"github.com/chrislusf/seaweedfs/weed/storage/needle"
 )
 
 var (
-    volumePath       = flag.String("dir", "/tmp", "data directory to store files")
-    volumeCollection = flag.String("collection", "", "the volume collection name")
-    volumeId         = flag.Int("volumeId", -1, "a volume id. The volume should already exist in the dir. The volume index file should not exist.")
+	volumePath       = flag.String("dir", "/tmp", "data directory to store files")
+	volumeCollection = flag.String("collection", "", "the volume collection name")
+	volumeId         = flag.Int("volumeId", -1, "a volume id. The volume should already exist in the dir. The volume index file should not exist.")
 )
 
-func Checksum(n* needle.Needle) string {
-     return fmt.Sprintf("%s%x", n.Id, n.Cookie)
+func Checksum(n *needle.Needle) string {
+	return fmt.Sprintf("%s%x", n.Id, n.Cookie)
 }
 
 type VolumeFileScanner4SeeDat struct {
-    version needle.Version
-    block storage.SuperBlock
+	version needle.Version
+	block   storage.SuperBlock
 
-    dir    string
-    hashes map[string]bool
-    dat * os.File
+	dir    string
+	hashes map[string]bool
+	dat    *os.File
 }
 
 func (scanner *VolumeFileScanner4SeeDat) VisitSuperBlock(superBlock storage.SuperBlock) error {
-    scanner.version = superBlock.Version()
-    scanner.block = superBlock
-    return nil
+	scanner.version = superBlock.Version()
+	scanner.block = superBlock
+	return nil
 
 }
 func (scanner *VolumeFileScanner4SeeDat) ReadNeedleBody() bool {
-    return true
+	return true
 }
 
 func (scanner *VolumeFileScanner4SeeDat) VisitNeedle(n *needle.Needle, offset int64) error {
 
-    if scanner.dat == nil {
-	newDatFile, err := os.Create(filepath.Join(*volumePath, "dat_fixed"))
-	if err != nil {
-		glog.Fatalf("Write New Volume Data %v", err)
+	if scanner.dat == nil {
+		newDatFile, err := os.Create(filepath.Join(*volumePath, "dat_fixed"))
+		if err != nil {
+			glog.Fatalf("Write New Volume Data %v", err)
+		}
+		scanner.dat = newDatFile
+		scanner.dat.Write(scanner.block.Bytes())
 	}
-	scanner.dat = newDatFile
-	scanner.dat.Write(scanner.block.Bytes())
-    }
 
-    checksum := Checksum(n)
+	checksum := Checksum(n)
 
-    if scanner.hashes[checksum] {
-        glog.V(0).Infof("duplicate checksum:%s fid:%d,%s%x @ offset:%d", checksum, *volumeId, n.Id, n.Cookie, offset)
-        return nil
-    }
-    scanner.hashes[checksum] = true
+	if scanner.hashes[checksum] {
+		glog.V(0).Infof("duplicate checksum:%s fid:%d,%s%x @ offset:%d", checksum, *volumeId, n.Id, n.Cookie, offset)
+		return nil
+	}
+	scanner.hashes[checksum] = true
 
-    _, s, _, e := n.Append(scanner.dat, scanner.version)
-    fmt.Printf("size %d error %v\n", s, e)
+	_, s, _, e := n.Append(scanner.dat, scanner.version)
+	fmt.Printf("size %d error %v\n", s, e)
 
-    return nil
+	return nil
 }
 
 func main() {
-    flag.Parse()
+	flag.Parse()
 
-    vid := needle.VolumeId(*volumeId)
+	vid := needle.VolumeId(*volumeId)
 
-    outpath, _ := filepath.Abs(filepath.Dir(os.Args[0]))
+	outpath, _ := filepath.Abs(filepath.Dir(os.Args[0]))
 
-    scanner := &VolumeFileScanner4SeeDat{
-        dir:    filepath.Join(outpath, "out"),
-        hashes: map[string]bool{},
-    }
+	scanner := &VolumeFileScanner4SeeDat{
+		dir:    filepath.Join(outpath, "out"),
+		hashes: map[string]bool{},
+	}
 
-    if _, err := os.Stat(scanner.dir); err != nil {
-        if err := os.MkdirAll(scanner.dir, os.ModePerm); err != nil {
-            glog.Fatalf("could not create output dir : %s", err)
-        }
-    }
+	if _, err := os.Stat(scanner.dir); err != nil {
+		if err := os.MkdirAll(scanner.dir, os.ModePerm); err != nil {
+			glog.Fatalf("could not create output dir : %s", err)
+		}
+	}
 
-    err := storage.ScanVolumeFile(*volumePath, *volumeCollection, vid, storage.NeedleMapInMemory, scanner)
-    if err != nil {
-        glog.Fatalf("Reading Volume File [ERROR] %s\n", err)
-    }
+	err := storage.ScanVolumeFile(*volumePath, *volumeCollection, vid, storage.NeedleMapInMemory, scanner)
+	if err != nil {
+		glog.Fatalf("Reading Volume File [ERROR] %s\n", err)
+	}
 
 }
diff --git a/unmaintained/see_dat/see_dat.go b/unmaintained/see_dat/see_dat.go
index e8e54fd4f..e07704fc6 100644
--- a/unmaintained/see_dat/see_dat.go
+++ b/unmaintained/see_dat/see_dat.go
@@ -2,12 +2,11 @@ package main
 
 import (
 	"flag"
+	"time"
 
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/storage"
 	"github.com/chrislusf/seaweedfs/weed/storage/needle"
-
-	"time"
 )
 
 var (
@@ -45,5 +44,4 @@ func main() {
 	if err != nil {
 		glog.Fatalf("Reading Volume File [ERROR] %s\n", err)
 	}
-
 }
diff --git a/weed/server/filer_server_handlers_write.go b/weed/server/filer_server_handlers_write.go
index b419c51af..5d95a5d7e 100644
--- a/weed/server/filer_server_handlers_write.go
+++ b/weed/server/filer_server_handlers_write.go
@@ -275,7 +275,7 @@ func (fs *FilerServer) DeleteHandler(w http.ResponseWriter, r *http.Request) {
 	isRecursive := r.FormValue("recursive") == "true"
 	ignoreRecursiveError := r.FormValue("ignoreRecursiveError") == "true"
 
-	err := fs.filer.DeleteEntryMetaAndData(context.Background(), filer2.FullPath(r.URL.Path), isRecursive, ignoreRecursiveError,true)
+	err := fs.filer.DeleteEntryMetaAndData(context.Background(), filer2.FullPath(r.URL.Path), isRecursive, ignoreRecursiveError, true)
 	if err != nil {
 		glog.V(1).Infoln("deleting", r.URL.Path, ":", err.Error())
 		writeJsonError(w, r, http.StatusInternalServerError, err)
diff --git a/weed/server/master_server_handlers.go b/weed/server/master_server_handlers.go
index 93f983375..728c32076 100644
--- a/weed/server/master_server_handlers.go
+++ b/weed/server/master_server_handlers.go
@@ -48,7 +48,7 @@ func (ms *MasterServer) dirLookupHandler(w http.ResponseWriter, r *http.Request)
 	collection := r.FormValue("collection") //optional, but can be faster if too many collections
 	location := ms.findVolumeLocation(collection, vid)
 	httpStatus := http.StatusOK
-	if location.Error != "" {
+	if location.Error != "" || location.Locations == nil {
 		httpStatus = http.StatusNotFound
 	} else {
 		forRead := r.FormValue("read")
@@ -60,7 +60,7 @@ func (ms *MasterServer) dirLookupHandler(w http.ResponseWriter, r *http.Request)
 
 // findVolumeLocation finds the volume location from master topo if it is leader,
 // or from master client if not leader
-func (ms *MasterServer) findVolumeLocation(collection string, vid string) operation.LookupResult {
+func (ms *MasterServer) findVolumeLocation(collection, vid string) operation.LookupResult {
 	var locations []operation.Location
 	var err error
 	if ms.Topo.IsLeader() {
diff --git a/weed/shell/command_volume_list.go b/weed/shell/command_volume_list.go
index 134580ffe..91b5a0d32 100644
--- a/weed/shell/command_volume_list.go
+++ b/weed/shell/command_volume_list.go
@@ -98,7 +98,7 @@ func writeDataNodeInfo(writer io.Writer, t *master_pb.DataNodeInfo) statistics {
 }
 func writeVolumeInformationMessage(writer io.Writer, t *master_pb.VolumeInformationMessage) statistics {
 	fmt.Fprintf(writer, "        volume %+v \n", t)
-	return newStatiscis(t)
+	return newStatistics(t)
 }
 
 type statistics struct {
@@ -108,7 +108,7 @@ type statistics struct {
 	DeletedBytes     uint64
 }
 
-func newStatiscis(t *master_pb.VolumeInformationMessage) statistics {
+func newStatistics(t *master_pb.VolumeInformationMessage) statistics {
 	return statistics{
 		Size:             t.Size,
 		FileCount:        t.FileCount,