diff --git a/other/java/client/src/main/java/seaweedfs/client/SeaweedInputStream.java b/other/java/client/src/main/java/seaweedfs/client/SeaweedInputStream.java
index 9d1fb3417..64754321b 100644
--- a/other/java/client/src/main/java/seaweedfs/client/SeaweedInputStream.java
+++ b/other/java/client/src/main/java/seaweedfs/client/SeaweedInputStream.java
@@ -119,9 +119,8 @@ public class SeaweedInputStream extends InputStream {
 
         long bytesRead = 0;
         int len = buf.remaining();
-        int start = (int) this.position;
-        if (start + len <= entry.getContent().size()) {
-            entry.getContent().substring(start, start + len).copyTo(buf);
+        if (this.position< Integer.MAX_VALUE && (this.position + len )<= entry.getContent().size()) {
+            entry.getContent().substring((int)this.position, (int)(this.position + len)).copyTo(buf);
         } else {
             bytesRead = SeaweedRead.read(this.filerClient, this.visibleIntervalList, this.position, buf, SeaweedRead.fileSize(entry));
         }
diff --git a/weed/s3api/bucket_metadata.go b/weed/s3api/bucket_metadata.go
index e660237de..f4088e6b3 100644
--- a/weed/s3api/bucket_metadata.go
+++ b/weed/s3api/bucket_metadata.go
@@ -1,16 +1,12 @@
 package s3api
 
 import (
-	"bytes"
 	"encoding/json"
-	"github.com/aws/aws-sdk-go/private/protocol/json/jsonutil"
 	"github.com/aws/aws-sdk-go/service/s3"
 	"github.com/seaweedfs/seaweedfs/weed/glog"
 	"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
 	"github.com/seaweedfs/seaweedfs/weed/s3api/s3_constants"
 	"github.com/seaweedfs/seaweedfs/weed/s3api/s3account"
-
-	//"github.com/seaweedfs/seaweedfs/weed/s3api"
 	"github.com/seaweedfs/seaweedfs/weed/s3api/s3err"
 	"github.com/seaweedfs/seaweedfs/weed/util"
 	"math"
@@ -23,7 +19,7 @@ var loadBucketMetadataFromFiler = func(r *BucketRegistry, bucketName string) (*B
 		return nil, err
 	}
 
-	return buildBucketMetadata(entry), nil
+	return buildBucketMetadata(r.s3a.accountManager, entry), nil
 }
 
 type BucketMetaData struct {
@@ -77,13 +73,13 @@ func (r *BucketRegistry) init() error {
 }
 
 func (r *BucketRegistry) LoadBucketMetadata(entry *filer_pb.Entry) {
-	bucketMetadata := buildBucketMetadata(entry)
+	bucketMetadata := buildBucketMetadata(r.s3a.accountManager, entry)
 	r.metadataCacheLock.Lock()
 	defer r.metadataCacheLock.Unlock()
 	r.metadataCache[entry.Name] = bucketMetadata
 }
 
-func buildBucketMetadata(entry *filer_pb.Entry) *BucketMetaData {
+func buildBucketMetadata(accountManager *s3account.AccountManager, entry *filer_pb.Entry) *BucketMetaData {
 	entryJson, _ := json.Marshal(entry)
 	glog.V(3).Infof("build bucket metadata,entry=%s", entryJson)
 	bucketMetadata := &BucketMetaData{
@@ -112,22 +108,29 @@ func buildBucketMetadata(entry *filer_pb.Entry) *BucketMetaData {
 		}
 
 		//access control policy
-		acpBytes, ok := entry.Extended[s3_constants.ExtAcpKey]
-		if ok {
-			var acp s3.AccessControlPolicy
-			err := jsonutil.UnmarshalJSON(&acp, bytes.NewReader(acpBytes))
-			if err == nil {
-				//validate owner
-				if acp.Owner != nil && acp.Owner.ID != nil {
-					bucketMetadata.Owner = acp.Owner
-				} else {
-					glog.Warningf("bucket ownerId is empty! bucket: %s", bucketMetadata.Name)
+		//owner
+		acpOwnerBytes, ok := entry.Extended[s3_constants.ExtAmzOwnerKey]
+		if ok && len(acpOwnerBytes) > 0 {
+			ownerAccountId := string(acpOwnerBytes)
+			ownerAccountName, exists := accountManager.IdNameMapping[ownerAccountId]
+			if !exists {
+				glog.Warningf("owner[id=%s] is invalid, bucket: %s", ownerAccountId, bucketMetadata.Name)
+			} else {
+				bucketMetadata.Owner = &s3.Owner{
+					ID:          &ownerAccountId,
+					DisplayName: &ownerAccountName,
 				}
-
-				//acl
-				bucketMetadata.Acl = acp.Grants
+			}
+		}
+		//grants
+		acpGrantsBytes, ok := entry.Extended[s3_constants.ExtAmzAclKey]
+		if ok && len(acpGrantsBytes) > 0 {
+			var grants []*s3.Grant
+			err := json.Unmarshal(acpGrantsBytes, &grants)
+			if err == nil {
+				bucketMetadata.Acl = grants
 			} else {
-				glog.Warningf("Unmarshal ACP: %s(%v), bucket: %s", string(acpBytes), err, bucketMetadata.Name)
+				glog.Warningf("Unmarshal ACP grants: %s(%v), bucket: %s", string(acpGrantsBytes), err, bucketMetadata.Name)
 			}
 		}
 	}
diff --git a/weed/s3api/bucket_metadata_test.go b/weed/s3api/bucket_metadata_test.go
index 23af6417b..f852a272a 100644
--- a/weed/s3api/bucket_metadata_test.go
+++ b/weed/s3api/bucket_metadata_test.go
@@ -1,8 +1,8 @@
 package s3api
 
 import (
+	"encoding/json"
 	"fmt"
-	"github.com/aws/aws-sdk-go/private/protocol/json/jsonutil"
 	"github.com/aws/aws-sdk-go/service/s3"
 	"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
 	"github.com/seaweedfs/seaweedfs/weed/s3api/s3_constants"
@@ -26,18 +26,13 @@ var (
 	}
 
 	//good entry
-	goodEntryAcp, _ = jsonutil.BuildJSON(&s3.AccessControlPolicy{
-		Owner: &s3.Owner{
-			DisplayName: &s3account.AccountAdmin.Name,
-			ID:          &s3account.AccountAdmin.Id,
-		},
-		Grants: s3_constants.PublicRead,
-	})
-	goodEntry = &filer_pb.Entry{
+	goodEntryAcl, _ = json.Marshal(s3_constants.PublicRead)
+	goodEntry       = &filer_pb.Entry{
 		Name: "entryWithValidAcp",
 		Extended: map[string][]byte{
 			s3_constants.ExtOwnershipKey: []byte(s3_constants.OwnershipBucketOwnerEnforced),
-			s3_constants.ExtAcpKey:       goodEntryAcp,
+			s3_constants.ExtAmzOwnerKey:  []byte(s3account.AccountAdmin.Name),
+			s3_constants.ExtAmzAclKey:    goodEntryAcl,
 		},
 	}
 
@@ -57,35 +52,28 @@ var (
 		},
 	}
 
-	//acp is ""
+	//owner is ""
 	acpEmptyStr = &filer_pb.Entry{
 		Name: "acpEmptyStr",
 		Extended: map[string][]byte{
-			s3_constants.ExtAcpKey: []byte(""),
+			s3_constants.ExtAmzOwnerKey: []byte(""),
 		},
 	}
 
-	//acp is empty object
-	acpEmptyObjectAcp, _ = jsonutil.BuildJSON(&s3.AccessControlPolicy{
-		Owner:  nil,
-		Grants: nil,
-	})
+	//owner not exists
 	acpEmptyObject = &filer_pb.Entry{
 		Name: "acpEmptyObject",
 		Extended: map[string][]byte{
-			s3_constants.ExtAcpKey: acpEmptyObjectAcp,
+			s3_constants.ExtAmzOwnerKey: []byte("xxxxx"),
 		},
 	}
 
-	//acp owner is nil
-	acpOwnerNilAcp, _ = jsonutil.BuildJSON(&s3.AccessControlPolicy{
-		Owner:  nil,
-		Grants: make([]*s3.Grant, 1),
-	})
-	acpOwnerNil = &filer_pb.Entry{
+	//grants is nil
+	acpOwnerNilAcp, _ = json.Marshal(make([]*s3.Grant, 0))
+	acpOwnerNil       = &filer_pb.Entry{
 		Name: "acpOwnerNil",
 		Extended: map[string][]byte{
-			s3_constants.ExtAcpKey: acpOwnerNilAcp,
+			s3_constants.ExtAmzAclKey: acpOwnerNilAcp,
 		},
 	}
 
@@ -175,8 +163,14 @@ var tcs = []*BucketMetadataTestCase{
 }
 
 func TestBuildBucketMetadata(t *testing.T) {
+	accountManager := &s3account.AccountManager{
+		IdNameMapping: map[string]string{
+			s3account.AccountAdmin.Id:     s3account.AccountAdmin.Name,
+			s3account.AccountAnonymous.Id: s3account.AccountAnonymous.Name,
+		},
+	}
 	for _, tc := range tcs {
-		resultBucketMetadata := buildBucketMetadata(tc.filerEntry)
+		resultBucketMetadata := buildBucketMetadata(accountManager, tc.filerEntry)
 		if !reflect.DeepEqual(resultBucketMetadata, tc.expectBucketMetadata) {
 			t.Fatalf("result is unexpect: \nresult: %v, \nexpect: %v", resultBucketMetadata, tc.expectBucketMetadata)
 		}
diff --git a/weed/s3api/s3_constants/extend_key.go b/weed/s3api/s3_constants/extend_key.go
index 10b69979e..f78983a99 100644
--- a/weed/s3api/s3_constants/extend_key.go
+++ b/weed/s3api/s3_constants/extend_key.go
@@ -1,6 +1,7 @@
 package s3_constants
 
 const (
-	ExtAcpKey       = "Seaweed-X-Amz-Acp"
+	ExtAmzOwnerKey  = "Seaweed-X-Amz-Owner"
+	ExtAmzAclKey    = "Seaweed-X-Amz-Acl"
 	ExtOwnershipKey = "Seaweed-X-Amz-Ownership"
 )
diff --git a/weed/server/filer_server_handlers_write_autochunk.go b/weed/server/filer_server_handlers_write_autochunk.go
index 96e5018da..7064cac02 100644
--- a/weed/server/filer_server_handlers_write_autochunk.go
+++ b/weed/server/filer_server_handlers_write_autochunk.go
@@ -375,10 +375,16 @@ func SaveAmzMetaData(r *http.Request, existing map[string][]byte, isReplace bool
 		}
 	}
 
-	//acp
-	acp := r.Header.Get(s3_constants.ExtAcpKey)
-	if len(acp) > 0 {
-		metadata[s3_constants.ExtAcpKey] = []byte(acp)
+	//acp-owner
+	acpOwner := r.Header.Get(s3_constants.ExtAmzOwnerKey)
+	if len(acpOwner) > 0 {
+		metadata[s3_constants.ExtAmzOwnerKey] = []byte(acpOwner)
+	}
+
+	//acp-grants
+	acpGrants := r.Header.Get(s3_constants.ExtAmzAclKey)
+	if len(acpOwner) > 0 {
+		metadata[s3_constants.ExtAmzAclKey] = []byte(acpGrants)
 	}
 
 	return
diff --git a/weed/storage/needle_map.go b/weed/storage/needle_map.go
index 682c88f78..0e49da959 100644
--- a/weed/storage/needle_map.go
+++ b/weed/storage/needle_map.go
@@ -48,7 +48,6 @@ type TempNeedleMapper interface {
 	NeedleMapper
 	DoOffsetLoading(v *Volume, indexFile *os.File, startFrom uint64) error
 	UpdateNeedleMap(v *Volume, indexFile *os.File, opts *opt.Options) error
-	UpdateNeedleMapMetric(indexFile *os.File) error
 }
 
 func (nm *baseNeedleMapper) IndexFileSize() uint64 {
diff --git a/weed/storage/needle_map_leveldb.go b/weed/storage/needle_map_leveldb.go
index e77651b78..30ed96c3b 100644
--- a/weed/storage/needle_map_leveldb.go
+++ b/weed/storage/needle_map_leveldb.go
@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"os"
 	"path/filepath"
+	"strings"
 
 	"github.com/syndtr/goleveldb/leveldb/errors"
 	"github.com/syndtr/goleveldb/leveldb/opt"
@@ -179,6 +180,7 @@ func levelDbWrite(db *leveldb.DB, key NeedleId, offset Offset, size Size, update
 	}
 	return nil
 }
+
 func levelDbDelete(db *leveldb.DB, key NeedleId) error {
 	bytes := make([]byte, NeedleIdSize)
 	NeedleIdToBytes(bytes, key)
@@ -305,23 +307,45 @@ func (m *LevelDbNeedleMap) DoOffsetLoading(v *Volume, indexFile *os.File, startF
 	}
 
 	err = idx.WalkIndexFile(indexFile, startFrom, func(key NeedleId, offset Offset, size Size) (e error) {
-		if !offset.IsZero() && size.IsValid() {
+		m.mapMetric.FileCounter++
+		bytes := make([]byte, NeedleIdSize)
+		NeedleIdToBytes(bytes[0:NeedleIdSize], key)
+		// fresh loading
+		if startFrom == 0 {
+			m.mapMetric.FileByteCounter += uint64(size)
+			e = levelDbWrite(db, key, offset, size, false, 0)
+			return e
+		}
+		// increment loading
+		data, err := db.Get(bytes, nil)
+		if err != nil {
+			if !strings.Contains(strings.ToLower(err.Error()), "not found") {
+				// unexpected error
+				return err
+			}
+			// new needle, unlikely happen
+			m.mapMetric.FileByteCounter += uint64(size)
 			e = levelDbWrite(db, key, offset, size, false, 0)
 		} else {
-			e = levelDbDelete(db, key)
+			// needle is found
+			oldSize := BytesToSize(data[OffsetSize : OffsetSize+SizeSize])
+			oldOffset := BytesToOffset(data[0:OffsetSize])
+			if !offset.IsZero() && size.IsValid() {
+				// updated needle
+				m.mapMetric.FileByteCounter += uint64(size)
+				if !oldOffset.IsZero() && oldSize.IsValid() {
+					m.mapMetric.DeletionCounter++
+					m.mapMetric.DeletionByteCounter += uint64(oldSize)
+				}
+				e = levelDbWrite(db, key, offset, size, false, 0)
+			} else {
+				// deleted needle
+				m.mapMetric.DeletionCounter++
+				m.mapMetric.DeletionByteCounter += uint64(oldSize)
+				e = levelDbDelete(db, key)
+			}
 		}
 		return e
 	})
-	if err != nil {
-		return err
-	}
-
-	if startFrom != 0 {
-		return needleMapMetricFromIndexFile(indexFile, &m.mapMetric)
-	}
-	return nil
-}
-
-func (m *LevelDbNeedleMap) UpdateNeedleMapMetric(indexFile *os.File) error {
-	return needleMapMetricFromIndexFile(indexFile, &m.mapMetric)
+	return err
 }
diff --git a/weed/storage/needle_map_memory.go b/weed/storage/needle_map_memory.go
index 93b1fa4f5..7721980ee 100644
--- a/weed/storage/needle_map_memory.go
+++ b/weed/storage/needle_map_memory.go
@@ -129,7 +129,3 @@ func (nm *NeedleMap) DoOffsetLoading(v *Volume, indexFile *os.File, startFrom ui
 
 	return e
 }
-
-func (m *NeedleMap) UpdateNeedleMapMetric(indexFile *os.File) error {
-	return nil
-}
diff --git a/weed/storage/volume_vacuum.go b/weed/storage/volume_vacuum.go
index 2862ca94d..38b5c0080 100644
--- a/weed/storage/volume_vacuum.go
+++ b/weed/storage/volume_vacuum.go
@@ -219,15 +219,7 @@ func (v *Volume) makeupDiff(newDatFileName, newIdxFileName, oldDatFileName, oldI
 		return fmt.Errorf("verifyIndexFileIntegrity %s failed: %v", oldIdxFileName, err)
 	}
 	if indexSize == 0 || uint64(indexSize) <= v.lastCompactIndexOffset {
-		if v.needleMapKind == NeedleMapInMemory {
-			return nil
-		}
-		newIdx, err := os.OpenFile(newIdxFileName, os.O_RDWR, 0644)
-		if err != nil {
-			return fmt.Errorf("open idx file %s failed: %v", newIdxFileName, err)
-		}
-		defer newIdx.Close()
-		return v.tmpNm.UpdateNeedleMapMetric(newIdx)
+		return nil
 	}
 
 	// fail if the old .dat file has changed to a new revision