diff --git a/Makefile b/Makefile
index 830e3ca76..9a62eb9fe 100644
--- a/Makefile
+++ b/Makefile
@@ -36,6 +36,9 @@ deps:
 build: deps
 	go build $(GO_FLAGS) -ldflags "$(LDFLAGS)" -o $(BINARY) $(SOURCE_DIR)
 
+install: deps
+	go install $(GO_FLAGS) -ldflags "$(LDFLAGS)" $(SOURCE_DIR)
+
 linux: deps
 	mkdir -p linux
 	GOOS=linux GOARCH=amd64 go build $(GO_FLAGS) -ldflags "$(LDFLAGS)" -o linux/$(BINARY) $(SOURCE_DIR)
diff --git a/README.md b/README.md
index 4d816c23d..4d5a8a80d 100644
--- a/README.md
+++ b/README.md
@@ -429,7 +429,7 @@ MinIO metadata are in simple files. Each file write will incur meta file writes.
 
 MinIO does not have optimization for large number of small files.
 
-MinIO has multiple disk IO to read one file. SeaweedFS has O(1) disk reads.
+MinIO has multiple disk IO to read one file. SeaweedFS has O(1) disk reads, even for erasure coded files.
 
 MinIO has full-time erasure coding. SeaweedFS uses replication on hot data for faster speed and optionally applies erasure coding on warm data.
 
@@ -463,30 +463,18 @@ https://golang.org/doc/install
 make sure you set up your $GOPATH
 
 
-Step 2: also you may need to install Mercurial by following the instructions at:
-
-http://mercurial.selenic.com/downloads
-
+Step 2: checkout this repo:
+```bash
+git clone https://github.com/chrislusf/seaweedfs.git
+```
 Step 3: download, compile, and install the project by executing the following command
 
 ```bash
-go get github.com/chrislusf/seaweedfs/weed
+make install
 ```
 
 Once this is done, you will find the executable "weed" in your `$GOPATH/bin` directory
 
-Note:
-* If you got into this problem, try to `rm -Rf $GOPATH/src/go.etcd.io/etcd/vendor/golang.org/x/net/trace` and build again.
-```
-panic: /debug/requests is already registered. You may have two independent copies of golang.org/x/net/trace in your binary, trying to maintain separate state. This may involve a vendored copy of golang.org/x/net/trace.
-```
-
-Step 4: after you modify your code locally, you could start a local build by calling `go install` under
-
-```
-$GOPATH/src/github.com/chrislusf/seaweedfs/weed
-```
-
 [Back to TOC](#table-of-contents)
 
 ## Disk Related Topics ##
diff --git a/docker/entrypoint.sh b/docker/entrypoint.sh
index 427576bcf..5a858d993 100755
--- a/docker/entrypoint.sh
+++ b/docker/entrypoint.sh
@@ -23,7 +23,8 @@ case "$1" in
 
   'master')
   	ARGS="-mdir=/data -volumePreallocate -volumeSizeLimitMB=1024"
-  	exec /usr/bin/weed $@ $ARGS
+  	shift
+  	exec /usr/bin/weed master $ARGS $@
 	;;
 
   'volume')
@@ -31,7 +32,8 @@ case "$1" in
   	if isArgPassed "-max" "$@"; then
   	  ARGS="-dir=/data"
   	fi
-  	exec /usr/bin/weed $@ $ARGS
+  	shift
+  	exec /usr/bin/weed volume $ARGS $@
 	;;
 
   'server')
@@ -39,17 +41,20 @@ case "$1" in
   	if isArgPassed "-volume.max" "$@"; then
   	  ARGS="-dir=/data -master.volumePreallocate -master.volumeSizeLimitMB=1024"
   	fi
-  	exec /usr/bin/weed $@ $ARGS
+ 	shift
+  	exec /usr/bin/weed server $ARGS $@
   	;;
 
   'filer')
   	ARGS=""
-  	exec /usr/bin/weed $@ $ARGS
+  	shift
+  	exec /usr/bin/weed filer $ARGS $@
 	;;
 
   's3')
   	ARGS="-domainName=$S3_DOMAIN_NAME -key.file=$S3_KEY_FILE -cert.file=$S3_CERT_FILE"
-  	exec /usr/bin/weed $@ $ARGS
+  	shift
+  	exec /usr/bin/weed s3 $ARGS $@
 	;;
 
   'cronjob')
diff --git a/other/java/client/src/main/proto/filer.proto b/other/java/client/src/main/proto/filer.proto
index dd5d08e1e..40a46b33f 100644
--- a/other/java/client/src/main/proto/filer.proto
+++ b/other/java/client/src/main/proto/filer.proto
@@ -218,6 +218,7 @@ message AssignVolumeRequest {
     int32 ttl_sec = 4;
     string data_center = 5;
     string parent_path = 6;
+    string rack = 7;
 }
 
 message AssignVolumeResponse {
diff --git a/weed/command/filer.go b/weed/command/filer.go
index e885eafc4..793401fe3 100644
--- a/weed/command/filer.go
+++ b/weed/command/filer.go
@@ -36,6 +36,7 @@ type FilerOptions struct {
 	maxMB                   *int
 	dirListingLimit         *int
 	dataCenter              *string
+	rack                    *string
 	enableNotification      *bool
 	disableHttp             *bool
 	cipher                  *bool
@@ -59,6 +60,7 @@ func init() {
 	f.maxMB = cmdFiler.Flag.Int("maxMB", 32, "split files larger than the limit")
 	f.dirListingLimit = cmdFiler.Flag.Int("dirListLimit", 100000, "limit sub dir listing size")
 	f.dataCenter = cmdFiler.Flag.String("dataCenter", "", "prefer to write to volumes in this data center")
+	f.rack = cmdFiler.Flag.String("rack", "", "prefer to write to volumes in this rack")
 	f.disableHttp = cmdFiler.Flag.Bool("disableHttp", false, "disable http request, only gRpc operations are allowed")
 	f.cipher = cmdFiler.Flag.Bool("encryptVolumeData", false, "encrypt data on volume servers")
 	f.peers = cmdFiler.Flag.String("peers", "", "all filers sharing the same filer store in comma separated ip:port list")
@@ -141,6 +143,7 @@ func (fo *FilerOptions) startFiler() {
 		MaxMB:              *fo.maxMB,
 		DirListingLimit:    *fo.dirListingLimit,
 		DataCenter:         *fo.dataCenter,
+		Rack:               *fo.rack,
 		DefaultLevelDbDir:  defaultLevelDbDirectory,
 		DisableHttp:        *fo.disableHttp,
 		Host:               *fo.ip,
diff --git a/weed/command/server.go b/weed/command/server.go
index 80fb14600..c55d2cfee 100644
--- a/weed/command/server.go
+++ b/weed/command/server.go
@@ -159,6 +159,7 @@ func runServer(cmd *Command, args []string) bool {
 	masterOptions.whiteList = serverWhiteListOption
 
 	filerOptions.dataCenter = serverDataCenter
+	filerOptions.rack = serverRack
 	filerOptions.disableHttp = serverDisableHttp
 	masterOptions.disableHttp = serverDisableHttp
 
diff --git a/weed/filesys/dirty_page.go b/weed/filesys/dirty_page.go
index a200050c4..7a3e859f5 100644
--- a/weed/filesys/dirty_page.go
+++ b/weed/filesys/dirty_page.go
@@ -2,11 +2,17 @@ package filesys
 
 import (
 	"bytes"
-	"github.com/chrislusf/seaweedfs/weed/glog"
-	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
 	"io"
+	"runtime"
 	"sync"
 	"time"
+
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+)
+
+var (
+	concurrentWriterLimit = runtime.NumCPU()
 )
 
 type ContinuousDirtyPages struct {
@@ -15,17 +21,26 @@ type ContinuousDirtyPages struct {
 	writeWaitGroup         sync.WaitGroup
 	chunkSaveErrChan       chan error
 	chunkSaveErrChanClosed bool
+	lastErr                error
 	lock                   sync.Mutex
 	collection             string
 	replication            string
 }
 
 func newDirtyPages(file *File) *ContinuousDirtyPages {
-	return &ContinuousDirtyPages{
+	dirtyPages := &ContinuousDirtyPages{
 		intervals:        &ContinuousIntervals{},
 		f:                file,
-		chunkSaveErrChan: make(chan error, 8),
+		chunkSaveErrChan: make(chan error, concurrentWriterLimit),
 	}
+	go func() {
+		for t := range dirtyPages.chunkSaveErrChan {
+			if t != nil {
+				dirtyPages.lastErr = t
+			}
+		}
+	}()
+	return dirtyPages
 }
 
 func (pages *ContinuousDirtyPages) AddPage(offset int64, data []byte) {
@@ -84,7 +99,7 @@ func (pages *ContinuousDirtyPages) saveExistingLargestPageToStorage() (hasSavedD
 func (pages *ContinuousDirtyPages) saveToStorage(reader io.Reader, offset int64, size int64) {
 
 	if pages.chunkSaveErrChanClosed {
-		pages.chunkSaveErrChan = make(chan error, 8)
+		pages.chunkSaveErrChan = make(chan error, concurrentWriterLimit)
 		pages.chunkSaveErrChanClosed = false
 	}
 
@@ -105,7 +120,7 @@ func (pages *ContinuousDirtyPages) saveToStorage(reader io.Reader, offset int64,
 		chunk.Mtime = mtime
 		pages.collection, pages.replication = collection, replication
 		pages.f.addChunks([]*filer_pb.FileChunk{chunk})
-		pages.chunkSaveErrChan <- nil
+		glog.V(3).Infof("%s saveToStorage [%d,%d)", pages.f.fullpath(), offset, offset+size)
 	}()
 }
 
diff --git a/weed/filesys/dirty_page_interval.go b/weed/filesys/dirty_page_interval.go
index afa2755ed..f143fe3e4 100644
--- a/weed/filesys/dirty_page_interval.go
+++ b/weed/filesys/dirty_page_interval.go
@@ -3,6 +3,8 @@ package filesys
 import (
 	"bytes"
 	"io"
+
+	"github.com/chrislusf/seaweedfs/weed/util"
 )
 
 type IntervalNode struct {
@@ -200,10 +202,13 @@ func (c *ContinuousIntervals) ReadDataAt(data []byte, startOffset int64) (maxSto
 func (l *IntervalLinkedList) ToReader() io.Reader {
 	var readers []io.Reader
 	t := l.Head
-	readers = append(readers, bytes.NewReader(t.Data))
+	readers = append(readers, util.NewBytesReader(t.Data))
 	for t.Next != nil {
 		t = t.Next
 		readers = append(readers, bytes.NewReader(t.Data))
 	}
+	if len(readers) == 1 {
+		return readers[0]
+	}
 	return io.MultiReader(readers...)
 }
diff --git a/weed/filesys/filehandle.go b/weed/filesys/filehandle.go
index 45abfcc5c..e3163117c 100644
--- a/weed/filesys/filehandle.go
+++ b/weed/filesys/filehandle.go
@@ -142,8 +142,7 @@ func (fh *FileHandle) Write(ctx context.Context, req *fuse.WriteRequest, resp *f
 	defer fh.Unlock()
 
 	// write the request to volume servers
-	data := make([]byte, len(req.Data))
-	copy(data, req.Data)
+	data := req.Data
 
 	fh.f.entry.Attributes.FileSize = uint64(max(req.Offset+int64(len(data)), int64(fh.f.entry.Attributes.FileSize)))
 	glog.V(4).Infof("%v write [%d,%d) %d", fh.f.fullpath(), req.Offset, req.Offset+int64(len(req.Data)), len(req.Data))
@@ -186,8 +185,10 @@ func (fh *FileHandle) Release(ctx context.Context, req *fuse.ReleaseRequest) err
 	}
 
 	// stop the goroutine
-	fh.dirtyPages.chunkSaveErrChanClosed = true
-	close(fh.dirtyPages.chunkSaveErrChan)
+	if !fh.dirtyPages.chunkSaveErrChanClosed {
+		fh.dirtyPages.chunkSaveErrChanClosed = true
+		close(fh.dirtyPages.chunkSaveErrChan)
+	}
 
 	return nil
 }
@@ -207,25 +208,17 @@ func (fh *FileHandle) doFlush(ctx context.Context, header fuse.Header) error {
 
 	fh.dirtyPages.saveExistingPagesToStorage()
 
-	var err error
-	go func() {
-		for t := range fh.dirtyPages.chunkSaveErrChan {
-			if t != nil {
-				err = t
-			}
-		}
-	}()
 	fh.dirtyPages.writeWaitGroup.Wait()
 
-	if err != nil {
-		return err
+	if fh.dirtyPages.lastErr != nil {
+		return fh.dirtyPages.lastErr
 	}
 
 	if !fh.f.dirtyMetadata {
 		return nil
 	}
 
-	err = fh.f.wfs.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
+	err := fh.f.wfs.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
 
 		if fh.f.entry.Attributes != nil {
 			fh.f.entry.Attributes.Mime = fh.contentType
diff --git a/weed/operation/upload_content.go b/weed/operation/upload_content.go
index e9002d09d..9eb05f6e1 100644
--- a/weed/operation/upload_content.go
+++ b/weed/operation/upload_content.go
@@ -76,10 +76,15 @@ func Upload(uploadUrl string, filename string, cipher bool, reader io.Reader, is
 }
 
 func doUpload(uploadUrl string, filename string, cipher bool, reader io.Reader, isInputCompressed bool, mtype string, pairMap map[string]string, jwt security.EncodedJwt) (uploadResult *UploadResult, err error, data []byte) {
-	data, err = ioutil.ReadAll(reader)
-	if err != nil {
-		err = fmt.Errorf("read input: %v", err)
-		return
+	bytesReader, ok := reader.(*util.BytesReader)
+	if ok {
+		data = bytesReader.Bytes
+	} else {
+		data, err = ioutil.ReadAll(reader)
+		if err != nil {
+			err = fmt.Errorf("read input: %v", err)
+			return
+		}
 	}
 	uploadResult, uploadErr := retriedUploadData(uploadUrl, filename, cipher, data, isInputCompressed, mtype, pairMap, jwt)
 	return uploadResult, uploadErr, data
diff --git a/weed/pb/filer.proto b/weed/pb/filer.proto
index dd5d08e1e..40a46b33f 100644
--- a/weed/pb/filer.proto
+++ b/weed/pb/filer.proto
@@ -218,6 +218,7 @@ message AssignVolumeRequest {
     int32 ttl_sec = 4;
     string data_center = 5;
     string parent_path = 6;
+    string rack = 7;
 }
 
 message AssignVolumeResponse {
diff --git a/weed/pb/filer_pb/filer.pb.go b/weed/pb/filer_pb/filer.pb.go
index e89c5f221..36d35eb8b 100644
--- a/weed/pb/filer_pb/filer.pb.go
+++ b/weed/pb/filer_pb/filer.pb.go
@@ -1481,6 +1481,7 @@ type AssignVolumeRequest struct {
 	TtlSec      int32  `protobuf:"varint,4,opt,name=ttl_sec,json=ttlSec,proto3" json:"ttl_sec,omitempty"`
 	DataCenter  string `protobuf:"bytes,5,opt,name=data_center,json=dataCenter,proto3" json:"data_center,omitempty"`
 	ParentPath  string `protobuf:"bytes,6,opt,name=parent_path,json=parentPath,proto3" json:"parent_path,omitempty"`
+	Rack        string `protobuf:"bytes,7,opt,name=rack,proto3" json:"rack,omitempty"`
 }
 
 func (x *AssignVolumeRequest) Reset() {
@@ -1557,6 +1558,13 @@ func (x *AssignVolumeRequest) GetParentPath() string {
 	return ""
 }
 
+func (x *AssignVolumeRequest) GetRack() string {
+	if x != nil {
+		return x.Rack
+	}
+	return ""
+}
+
 type AssignVolumeResponse struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -3251,7 +3259,7 @@ var file_filer_proto_rawDesc = []byte{
 	0x65, 0x77, 0x5f, 0x6e, 0x61, 0x6d, 0x65, 0x18, 0x04, 0x20, 0x01, 0x28, 0x09, 0x52, 0x07, 0x6e,
 	0x65, 0x77, 0x4e, 0x61, 0x6d, 0x65, 0x22, 0x1b, 0x0a, 0x19, 0x41, 0x74, 0x6f, 0x6d, 0x69, 0x63,
 	0x52, 0x65, 0x6e, 0x61, 0x6d, 0x65, 0x45, 0x6e, 0x74, 0x72, 0x79, 0x52, 0x65, 0x73, 0x70, 0x6f,
-	0x6e, 0x73, 0x65, 0x22, 0xc8, 0x01, 0x0a, 0x13, 0x41, 0x73, 0x73, 0x69, 0x67, 0x6e, 0x56, 0x6f,
+	0x6e, 0x73, 0x65, 0x22, 0xdc, 0x01, 0x0a, 0x13, 0x41, 0x73, 0x73, 0x69, 0x67, 0x6e, 0x56, 0x6f,
 	0x6c, 0x75, 0x6d, 0x65, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x12, 0x14, 0x0a, 0x05, 0x63,
 	0x6f, 0x75, 0x6e, 0x74, 0x18, 0x01, 0x20, 0x01, 0x28, 0x05, 0x52, 0x05, 0x63, 0x6f, 0x75, 0x6e,
 	0x74, 0x12, 0x1e, 0x0a, 0x0a, 0x63, 0x6f, 0x6c, 0x6c, 0x65, 0x63, 0x74, 0x69, 0x6f, 0x6e, 0x18,
@@ -3263,276 +3271,277 @@ var file_filer_proto_rawDesc = []byte{
 	0x64, 0x61, 0x74, 0x61, 0x5f, 0x63, 0x65, 0x6e, 0x74, 0x65, 0x72, 0x18, 0x05, 0x20, 0x01, 0x28,
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+	0x75, 0x65, 0x73, 0x74, 0x1a, 0x23, 0x2e, 0x66, 0x69, 0x6c, 0x65, 0x72, 0x5f, 0x70, 0x62, 0x2e,
+	0x53, 0x75, 0x62, 0x73, 0x63, 0x72, 0x69, 0x62, 0x65, 0x4d, 0x65, 0x74, 0x61, 0x64, 0x61, 0x74,
+	0x61, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x22, 0x00, 0x30, 0x01, 0x12, 0x65, 0x0a,
+	0x16, 0x53, 0x75, 0x62, 0x73, 0x63, 0x72, 0x69, 0x62, 0x65, 0x4c, 0x6f, 0x63, 0x61, 0x6c, 0x4d,
+	0x65, 0x74, 0x61, 0x64, 0x61, 0x74, 0x61, 0x12, 0x22, 0x2e, 0x66, 0x69, 0x6c, 0x65, 0x72, 0x5f,
 	0x70, 0x62, 0x2e, 0x53, 0x75, 0x62, 0x73, 0x63, 0x72, 0x69, 0x62, 0x65, 0x4d, 0x65, 0x74, 0x61,
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-	0x12, 0x56, 0x0a, 0x0d, 0x4b, 0x65, 0x65, 0x70, 0x43, 0x6f, 0x6e, 0x6e, 0x65, 0x63, 0x74, 0x65,
-	0x64, 0x12, 0x1e, 0x2e, 0x66, 0x69, 0x6c, 0x65, 0x72, 0x5f, 0x70, 0x62, 0x2e, 0x4b, 0x65, 0x65,
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-	0x74, 0x1a, 0x1f, 0x2e, 0x66, 0x69, 0x6c, 0x65, 0x72, 0x5f, 0x70, 0x62, 0x2e, 0x4b, 0x65, 0x65,
-	0x70, 0x43, 0x6f, 0x6e, 0x6e, 0x65, 0x63, 0x74, 0x65, 0x64, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e,
-	0x73, 0x65, 0x22, 0x00, 0x28, 0x01, 0x30, 0x01, 0x12, 0x4f, 0x0a, 0x0c, 0x4c, 0x6f, 0x63, 0x61,
-	0x74, 0x65, 0x42, 0x72, 0x6f, 0x6b, 0x65, 0x72, 0x12, 0x1d, 0x2e, 0x66, 0x69, 0x6c, 0x65, 0x72,
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-	0x65, 0x74, 0x12, 0x16, 0x2e, 0x66, 0x69, 0x6c, 0x65, 0x72, 0x5f, 0x70, 0x62, 0x2e, 0x4b, 0x76,
-	0x47, 0x65, 0x74, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x1a, 0x17, 0x2e, 0x66, 0x69, 0x6c,
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-	0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x1a, 0x17, 0x2e, 0x66, 0x69, 0x6c, 0x65, 0x72, 0x5f, 0x70,
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-	0x00, 0x42, 0x4f, 0x0a, 0x10, 0x73, 0x65, 0x61, 0x77, 0x65, 0x65, 0x64, 0x66, 0x73, 0x2e, 0x63,
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-	0x72, 0x69, 0x73, 0x6c, 0x75, 0x73, 0x66, 0x2f, 0x73, 0x65, 0x61, 0x77, 0x65, 0x65, 0x64, 0x66,
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-	0x70, 0x62, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
+	0x64, 0x61, 0x74, 0x61, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x1a, 0x23, 0x2e, 0x66, 0x69,
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+	0x22, 0x00, 0x30, 0x01, 0x12, 0x56, 0x0a, 0x0d, 0x4b, 0x65, 0x65, 0x70, 0x43, 0x6f, 0x6e, 0x6e,
+	0x65, 0x63, 0x74, 0x65, 0x64, 0x12, 0x1e, 0x2e, 0x66, 0x69, 0x6c, 0x65, 0x72, 0x5f, 0x70, 0x62,
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+	0x4c, 0x6f, 0x63, 0x61, 0x74, 0x65, 0x42, 0x72, 0x6f, 0x6b, 0x65, 0x72, 0x12, 0x1d, 0x2e, 0x66,
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+	0x6c, 0x65, 0x72, 0x5f, 0x70, 0x62, 0x2e, 0x4c, 0x6f, 0x63, 0x61, 0x74, 0x65, 0x42, 0x72, 0x6f,
+	0x6b, 0x65, 0x72, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x22, 0x00, 0x12, 0x3a, 0x0a,
+	0x05, 0x4b, 0x76, 0x47, 0x65, 0x74, 0x12, 0x16, 0x2e, 0x66, 0x69, 0x6c, 0x65, 0x72, 0x5f, 0x70,
+	0x62, 0x2e, 0x4b, 0x76, 0x47, 0x65, 0x74, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x1a, 0x17,
+	0x2e, 0x66, 0x69, 0x6c, 0x65, 0x72, 0x5f, 0x70, 0x62, 0x2e, 0x4b, 0x76, 0x47, 0x65, 0x74, 0x52,
+	0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x22, 0x00, 0x12, 0x3a, 0x0a, 0x05, 0x4b, 0x76, 0x50,
+	0x75, 0x74, 0x12, 0x16, 0x2e, 0x66, 0x69, 0x6c, 0x65, 0x72, 0x5f, 0x70, 0x62, 0x2e, 0x4b, 0x76,
+	0x50, 0x75, 0x74, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x1a, 0x17, 0x2e, 0x66, 0x69, 0x6c,
+	0x65, 0x72, 0x5f, 0x70, 0x62, 0x2e, 0x4b, 0x76, 0x50, 0x75, 0x74, 0x52, 0x65, 0x73, 0x70, 0x6f,
+	0x6e, 0x73, 0x65, 0x22, 0x00, 0x42, 0x4f, 0x0a, 0x10, 0x73, 0x65, 0x61, 0x77, 0x65, 0x65, 0x64,
+	0x66, 0x73, 0x2e, 0x63, 0x6c, 0x69, 0x65, 0x6e, 0x74, 0x42, 0x0a, 0x46, 0x69, 0x6c, 0x65, 0x72,
+	0x50, 0x72, 0x6f, 0x74, 0x6f, 0x5a, 0x2f, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f,
+	0x6d, 0x2f, 0x63, 0x68, 0x72, 0x69, 0x73, 0x6c, 0x75, 0x73, 0x66, 0x2f, 0x73, 0x65, 0x61, 0x77,
+	0x65, 0x65, 0x64, 0x66, 0x73, 0x2f, 0x77, 0x65, 0x65, 0x64, 0x2f, 0x70, 0x62, 0x2f, 0x66, 0x69,
+	0x6c, 0x65, 0x72, 0x5f, 0x70, 0x62, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
diff --git a/weed/s3api/s3api_object_handlers.go b/weed/s3api/s3api_object_handlers.go
index 93d6db79f..fa628f44e 100644
--- a/weed/s3api/s3api_object_handlers.go
+++ b/weed/s3api/s3api_object_handlers.go
@@ -5,12 +5,13 @@ import (
 	"encoding/json"
 	"encoding/xml"
 	"fmt"
-	"github.com/chrislusf/seaweedfs/weed/s3api/s3err"
 	"io"
 	"io/ioutil"
 	"net/http"
 	"strings"
 
+	"github.com/chrislusf/seaweedfs/weed/s3api/s3err"
+
 	"github.com/gorilla/mux"
 
 	"github.com/chrislusf/seaweedfs/weed/glog"
@@ -333,7 +334,7 @@ func (s3a *S3ApiServer) putToFiler(r *http.Request, uploadUrl string, dataReader
 	}
 	if ret.Error != "" {
 		glog.Errorf("upload to filer error: %v", ret.Error)
-		return "", s3err.ErrInternalError
+		return "", filerErrorToS3Error(ret.Error)
 	}
 
 	return etag, s3err.ErrNone
@@ -359,3 +360,10 @@ func getBucketAndObject(r *http.Request) (bucket, object string) {
 
 	return
 }
+
+func filerErrorToS3Error(errString string) s3err.ErrorCode {
+	if strings.HasPrefix(errString, "existing ") && strings.HasSuffix(errString, "is a directory") {
+		return s3err.ErrExistingObjectIsDirectory
+	}
+	return s3err.ErrInternalError
+}
diff --git a/weed/s3api/s3err/s3api_errors.go b/weed/s3api/s3err/s3api_errors.go
index f95652afb..a3f7bb25e 100644
--- a/weed/s3api/s3err/s3api_errors.go
+++ b/weed/s3api/s3err/s3api_errors.go
@@ -92,6 +92,8 @@ const (
 	ErrMissingDateHeader
 	ErrInvalidRequest
 	ErrNotImplemented
+
+	ErrExistingObjectIsDirectory
 )
 
 // error code to APIError structure, these fields carry respective
@@ -344,6 +346,11 @@ var errorCodeResponse = map[ErrorCode]APIError{
 		Description:    "A header you provided implies functionality that is not implemented",
 		HTTPStatusCode: http.StatusNotImplemented,
 	},
+	ErrExistingObjectIsDirectory: {
+		Code:           "ExistingObjectIsDirectory",
+		Description:    "Existing Object is a directory.",
+		HTTPStatusCode: http.StatusConflict,
+	},
 }
 
 // GetAPIError provides API Error for input API error code.
diff --git a/weed/server/filer_grpc_server.go b/weed/server/filer_grpc_server.go
index fefc231b3..d6dddf911 100644
--- a/weed/server/filer_grpc_server.go
+++ b/weed/server/filer_grpc_server.go
@@ -257,12 +257,7 @@ func (fs *FilerServer) cleanupChunks(existingEntry *filer.Entry, newEntry *filer
 	garbage = append(garbage, coveredChunks...)
 
 	if newEntry.Attributes != nil {
-		chunks, err = filer.MaybeManifestize(fs.saveAsChunk(
-			newEntry.Attributes.Replication,
-			newEntry.Attributes.Collection,
-			"",
-			needle.SecondsToTTL(newEntry.Attributes.TtlSec),
-			false), chunks)
+		chunks, err = filer.MaybeManifestize(fs.saveAsChunk(newEntry.Attributes.Replication, newEntry.Attributes.Collection, "", "", needle.SecondsToTTL(newEntry.Attributes.TtlSec), false), chunks)
 		if err != nil {
 			// not good, but should be ok
 			glog.V(0).Infof("MaybeManifestize: %v", err)
@@ -303,12 +298,7 @@ func (fs *FilerServer) AppendToEntry(ctx context.Context, req *filer_pb.AppendTo
 
 	entry.Chunks = append(entry.Chunks, req.Chunks...)
 
-	entry.Chunks, err = filer.MaybeManifestize(fs.saveAsChunk(
-		entry.Replication,
-		entry.Collection,
-		"",
-		needle.SecondsToTTL(entry.TtlSec),
-		false), entry.Chunks)
+	entry.Chunks, err = filer.MaybeManifestize(fs.saveAsChunk(entry.Replication, entry.Collection, "", "", needle.SecondsToTTL(entry.TtlSec), false), entry.Chunks)
 	if err != nil {
 		// not good, but should be ok
 		glog.V(0).Infof("MaybeManifestize: %v", err)
@@ -345,6 +335,10 @@ func (fs *FilerServer) AssignVolume(ctx context.Context, req *filer_pb.AssignVol
 	if dataCenter == "" {
 		dataCenter = fs.option.DataCenter
 	}
+	rack := req.Rack
+	if rack == "" {
+		rack = fs.option.Rack
+	}
 
 	assignRequest := &operation.VolumeAssignRequest{
 		Count:       uint64(req.Count),
@@ -352,14 +346,16 @@ func (fs *FilerServer) AssignVolume(ctx context.Context, req *filer_pb.AssignVol
 		Collection:  collection,
 		Ttl:         ttlStr,
 		DataCenter:  dataCenter,
+		Rack:        rack,
 	}
-	if dataCenter != "" {
+	if dataCenter != "" || rack != "" {
 		altRequest = &operation.VolumeAssignRequest{
 			Count:       uint64(req.Count),
 			Replication: replication,
 			Collection:  collection,
 			Ttl:         ttlStr,
 			DataCenter:  "",
+			Rack:        "",
 		}
 	}
 	assignResult, err := operation.Assign(fs.filer.GetMaster(), fs.grpcDialOption, assignRequest, altRequest)
diff --git a/weed/server/filer_server.go b/weed/server/filer_server.go
index 59c149cef..065bb3251 100644
--- a/weed/server/filer_server.go
+++ b/weed/server/filer_server.go
@@ -3,12 +3,13 @@ package weed_server
 import (
 	"context"
 	"fmt"
-	"github.com/chrislusf/seaweedfs/weed/stats"
 	"net/http"
 	"os"
 	"sync"
 	"time"
 
+	"github.com/chrislusf/seaweedfs/weed/stats"
+
 	"google.golang.org/grpc"
 
 	"github.com/chrislusf/seaweedfs/weed/util/grace"
@@ -47,6 +48,7 @@ type FilerOption struct {
 	MaxMB              int
 	DirListingLimit    int
 	DataCenter         string
+	Rack               string
 	DefaultLevelDbDir  string
 	DisableHttp        bool
 	Host               string
diff --git a/weed/server/filer_server_handlers_write.go b/weed/server/filer_server_handlers_write.go
index 584ab9823..267b8752d 100644
--- a/weed/server/filer_server_handlers_write.go
+++ b/weed/server/filer_server_handlers_write.go
@@ -29,7 +29,7 @@ type FilerPostResult struct {
 	Url   string `json:"url,omitempty"`
 }
 
-func (fs *FilerServer) assignNewFileInfo(replication, collection, dataCenter, ttlString string, fsync bool) (fileId, urlLocation string, auth security.EncodedJwt, err error) {
+func (fs *FilerServer) assignNewFileInfo(replication, collection, dataCenter, rack, ttlString string, fsync bool) (fileId, urlLocation string, auth security.EncodedJwt, err error) {
 
 	stats.FilerRequestCounter.WithLabelValues("assign").Inc()
 	start := time.Now()
@@ -43,13 +43,14 @@ func (fs *FilerServer) assignNewFileInfo(replication, collection, dataCenter, tt
 		DataCenter:  dataCenter,
 	}
 	var altRequest *operation.VolumeAssignRequest
-	if dataCenter != "" {
+	if dataCenter != "" || rack != "" {
 		altRequest = &operation.VolumeAssignRequest{
 			Count:       1,
 			Replication: replication,
 			Collection:  collection,
 			Ttl:         ttlString,
 			DataCenter:  "",
+			Rack:        "",
 		}
 	}
 
@@ -78,6 +79,10 @@ func (fs *FilerServer) PostHandler(w http.ResponseWriter, r *http.Request) {
 	if dataCenter == "" {
 		dataCenter = fs.option.DataCenter
 	}
+	rack := query.Get("rack")
+	if dataCenter == "" {
+		rack = fs.option.Rack
+	}
 	ttlString := r.URL.Query().Get("ttl")
 
 	// read ttl in seconds
@@ -87,7 +92,7 @@ func (fs *FilerServer) PostHandler(w http.ResponseWriter, r *http.Request) {
 		ttlSeconds = int32(ttl.Minutes()) * 60
 	}
 
-	fs.autoChunk(ctx, w, r, replication, collection, dataCenter, ttlSeconds, ttlString, fsync)
+	fs.autoChunk(ctx, w, r, replication, collection, dataCenter, rack, ttlSeconds, ttlString, fsync)
 
 }
 
diff --git a/weed/server/filer_server_handlers_write_autochunk.go b/weed/server/filer_server_handlers_write_autochunk.go
index 2b37e3c5d..d86d49b2a 100644
--- a/weed/server/filer_server_handlers_write_autochunk.go
+++ b/weed/server/filer_server_handlers_write_autochunk.go
@@ -23,8 +23,7 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/util"
 )
 
-func (fs *FilerServer) autoChunk(ctx context.Context, w http.ResponseWriter, r *http.Request,
-	replication string, collection string, dataCenter string, ttlSec int32, ttlString string, fsync bool) {
+func (fs *FilerServer) autoChunk(ctx context.Context, w http.ResponseWriter, r *http.Request, replication string, collection string, dataCenter string, rack string, ttlSec int32, ttlString string, fsync bool) {
 
 	// autoChunking can be set at the command-line level or as a query param. Query param overrides command-line
 	query := r.URL.Query()
@@ -50,10 +49,10 @@ func (fs *FilerServer) autoChunk(ctx context.Context, w http.ResponseWriter, r *
 		if r.Header.Get("Content-Type") == "" && strings.HasSuffix(r.URL.Path, "/") {
 			reply, err = fs.mkdir(ctx, w, r)
 		} else {
-			reply, md5bytes, err = fs.doPostAutoChunk(ctx, w, r, chunkSize, replication, collection, dataCenter, ttlSec, ttlString, fsync)
+			reply, md5bytes, err = fs.doPostAutoChunk(ctx, w, r, chunkSize, replication, collection, dataCenter, rack, ttlSec, ttlString, fsync)
 		}
 	} else {
-		reply, md5bytes, err = fs.doPutAutoChunk(ctx, w, r, chunkSize, replication, collection, dataCenter, ttlSec, ttlString, fsync)
+		reply, md5bytes, err = fs.doPutAutoChunk(ctx, w, r, chunkSize, replication, collection, dataCenter, rack, ttlSec, ttlString, fsync)
 	}
 	if err != nil {
 		writeJsonError(w, r, http.StatusInternalServerError, err)
@@ -65,7 +64,7 @@ func (fs *FilerServer) autoChunk(ctx context.Context, w http.ResponseWriter, r *
 	}
 }
 
-func (fs *FilerServer) doPostAutoChunk(ctx context.Context, w http.ResponseWriter, r *http.Request, chunkSize int32, replication string, collection string, dataCenter string, ttlSec int32, ttlString string, fsync bool) (filerResult *FilerPostResult, md5bytes []byte, replyerr error) {
+func (fs *FilerServer) doPostAutoChunk(ctx context.Context, w http.ResponseWriter, r *http.Request, chunkSize int32, replication string, collection string, dataCenter string, rack string, ttlSec int32, ttlString string, fsync bool) (filerResult *FilerPostResult, md5bytes []byte, replyerr error) {
 
 	multipartReader, multipartReaderErr := r.MultipartReader()
 	if multipartReaderErr != nil {
@@ -86,12 +85,12 @@ func (fs *FilerServer) doPostAutoChunk(ctx context.Context, w http.ResponseWrite
 		contentType = ""
 	}
 
-	fileChunks, md5Hash, chunkOffset, err := fs.uploadReaderToChunks(w, r, part1, chunkSize, replication, collection, dataCenter, ttlString, fileName, contentType, fsync)
+	fileChunks, md5Hash, chunkOffset, err := fs.uploadReaderToChunks(w, r, part1, chunkSize, replication, collection, dataCenter, rack, ttlString, fileName, contentType, fsync)
 	if err != nil {
 		return nil, nil, err
 	}
 
-	fileChunks, replyerr = filer.MaybeManifestize(fs.saveAsChunk(replication, collection, dataCenter, ttlString, fsync), fileChunks)
+	fileChunks, replyerr = filer.MaybeManifestize(fs.saveAsChunk(replication, collection, dataCenter, rack, ttlString, fsync), fileChunks)
 	if replyerr != nil {
 		glog.V(0).Infof("manifestize %s: %v", r.RequestURI, replyerr)
 		return
@@ -103,17 +102,17 @@ func (fs *FilerServer) doPostAutoChunk(ctx context.Context, w http.ResponseWrite
 	return
 }
 
-func (fs *FilerServer) doPutAutoChunk(ctx context.Context, w http.ResponseWriter, r *http.Request, chunkSize int32, replication string, collection string, dataCenter string, ttlSec int32, ttlString string, fsync bool) (filerResult *FilerPostResult, md5bytes []byte, replyerr error) {
+func (fs *FilerServer) doPutAutoChunk(ctx context.Context, w http.ResponseWriter, r *http.Request, chunkSize int32, replication string, collection string, dataCenter string, rack string, ttlSec int32, ttlString string, fsync bool) (filerResult *FilerPostResult, md5bytes []byte, replyerr error) {
 
 	fileName := ""
 	contentType := ""
 
-	fileChunks, md5Hash, chunkOffset, err := fs.uploadReaderToChunks(w, r, r.Body, chunkSize, replication, collection, dataCenter, ttlString, fileName, contentType, fsync)
+	fileChunks, md5Hash, chunkOffset, err := fs.uploadReaderToChunks(w, r, r.Body, chunkSize, replication, collection, dataCenter, rack, ttlString, fileName, contentType, fsync)
 	if err != nil {
 		return nil, nil, err
 	}
 
-	fileChunks, replyerr = filer.MaybeManifestize(fs.saveAsChunk(replication, collection, dataCenter, ttlString, fsync), fileChunks)
+	fileChunks, replyerr = filer.MaybeManifestize(fs.saveAsChunk(replication, collection, dataCenter, rack, ttlString, fsync), fileChunks)
 	if replyerr != nil {
 		glog.V(0).Infof("manifestize %s: %v", r.RequestURI, replyerr)
 		return
@@ -186,7 +185,7 @@ func (fs *FilerServer) saveMetaData(ctx context.Context, r *http.Request, fileNa
 	return filerResult, replyerr
 }
 
-func (fs *FilerServer) uploadReaderToChunks(w http.ResponseWriter, r *http.Request, reader io.Reader, chunkSize int32, replication string, collection string, dataCenter string, ttlString string, fileName string, contentType string, fsync bool) ([]*filer_pb.FileChunk, hash.Hash, int64, error) {
+func (fs *FilerServer) uploadReaderToChunks(w http.ResponseWriter, r *http.Request, reader io.Reader, chunkSize int32, replication string, collection string, dataCenter string, rack string, ttlString string, fileName string, contentType string, fsync bool) ([]*filer_pb.FileChunk, hash.Hash, int64, error) {
 	var fileChunks []*filer_pb.FileChunk
 
 	md5Hash := md5.New()
@@ -198,7 +197,7 @@ func (fs *FilerServer) uploadReaderToChunks(w http.ResponseWriter, r *http.Reque
 		limitedReader := io.LimitReader(partReader, int64(chunkSize))
 
 		// assign one file id for one chunk
-		fileId, urlLocation, auth, assignErr := fs.assignNewFileInfo(replication, collection, dataCenter, ttlString, fsync)
+		fileId, urlLocation, auth, assignErr := fs.assignNewFileInfo(replication, collection, dataCenter, rack, ttlString, fsync)
 		if assignErr != nil {
 			return nil, nil, 0, assignErr
 		}
@@ -242,11 +241,11 @@ func (fs *FilerServer) doUpload(urlLocation string, w http.ResponseWriter, r *ht
 	return uploadResult, err
 }
 
-func (fs *FilerServer) saveAsChunk(replication string, collection string, dataCenter string, ttlString string, fsync bool) filer.SaveDataAsChunkFunctionType {
+func (fs *FilerServer) saveAsChunk(replication string, collection string, dataCenter string, rack string, ttlString string, fsync bool) filer.SaveDataAsChunkFunctionType {
 
 	return func(reader io.Reader, name string, offset int64) (*filer_pb.FileChunk, string, string, error) {
 		// assign one file id for one chunk
-		fileId, urlLocation, auth, assignErr := fs.assignNewFileInfo(replication, collection, dataCenter, ttlString, fsync)
+		fileId, urlLocation, auth, assignErr := fs.assignNewFileInfo(replication, collection, dataCenter, rack, ttlString, fsync)
 		if assignErr != nil {
 			return nil, "", "", assignErr
 		}
diff --git a/weed/server/filer_server_handlers_write_cipher.go b/weed/server/filer_server_handlers_write_cipher.go
index 60082a8d4..720d97027 100644
--- a/weed/server/filer_server_handlers_write_cipher.go
+++ b/weed/server/filer_server_handlers_write_cipher.go
@@ -16,10 +16,9 @@ import (
 )
 
 // handling single chunk POST or PUT upload
-func (fs *FilerServer) encrypt(ctx context.Context, w http.ResponseWriter, r *http.Request,
-	replication string, collection string, dataCenter string, ttlSeconds int32, ttlString string, fsync bool) (filerResult *FilerPostResult, err error) {
+func (fs *FilerServer) encrypt(ctx context.Context, w http.ResponseWriter, r *http.Request, replication string, collection string, dataCenter string, rack string, ttlSeconds int32, ttlString string, fsync bool) (filerResult *FilerPostResult, err error) {
 
-	fileId, urlLocation, auth, err := fs.assignNewFileInfo(replication, collection, dataCenter, ttlString, fsync)
+	fileId, urlLocation, auth, err := fs.assignNewFileInfo(replication, collection, dataCenter, rack, ttlString, fsync)
 
 	if err != nil || fileId == "" || urlLocation == "" {
 		return nil, fmt.Errorf("fail to allocate volume for %s, collection:%s, datacenter:%s", r.URL.Path, collection, dataCenter)
diff --git a/weed/topology/topology_vacuum.go b/weed/topology/topology_vacuum.go
index 4f3d69627..7bf55d131 100644
--- a/weed/topology/topology_vacuum.go
+++ b/weed/topology/topology_vacuum.go
@@ -42,13 +42,17 @@ func batchVacuumVolumeCheck(grpcDialOption grpc.DialOption, vl *VolumeLayout, vi
 		}(index, dn.Url(), vid)
 	}
 	vacuumLocationList := NewVolumeLocationList()
+
+	waitTimeout := time.NewTimer(30 * time.Minute)
+	defer waitTimeout.Stop()
+
 	for range locationlist.list {
 		select {
 		case index := <-ch:
 			if index != -1 {
 				vacuumLocationList.list = append(vacuumLocationList.list, locationlist.list[index])
 			}
-		case <-time.After(30 * time.Minute):
+		case <-waitTimeout.C:
 			return vacuumLocationList, false
 		}
 	}
@@ -81,11 +85,15 @@ func batchVacuumVolumeCompact(grpcDialOption grpc.DialOption, vl *VolumeLayout,
 		}(index, dn.Url(), vid)
 	}
 	isVacuumSuccess := true
+
+	waitTimeout := time.NewTimer(30 * time.Minute)
+	defer waitTimeout.Stop()
+
 	for range locationlist.list {
 		select {
 		case canCommit := <-ch:
 			isVacuumSuccess = isVacuumSuccess && canCommit
-		case <-time.After(30 * time.Minute):
+		case <-waitTimeout.C:
 			return false
 		}
 	}
diff --git a/weed/util/bytes.go b/weed/util/bytes.go
index 67e6876fa..c2a4df108 100644
--- a/weed/util/bytes.go
+++ b/weed/util/bytes.go
@@ -1,6 +1,7 @@
 package util
 
 import (
+	"bytes"
 	"crypto/md5"
 	"crypto/rand"
 	"encoding/base64"
@@ -148,3 +149,15 @@ func RandomBytes(byteCount int) []byte {
 	rand.Read(buf)
 	return buf
 }
+
+type BytesReader struct {
+	Bytes []byte
+	*bytes.Reader
+}
+
+func NewBytesReader(b []byte) *BytesReader {
+	return &BytesReader{
+		Bytes:  b,
+		Reader: bytes.NewReader(b),
+	}
+}
diff --git a/weed/util/limiter.go b/weed/util/limiter.go
new file mode 100644
index 000000000..91499632c
--- /dev/null
+++ b/weed/util/limiter.go
@@ -0,0 +1,40 @@
+package util
+
+// initial version comes from https://github.com/korovkin/limiter/blob/master/limiter.go
+
+// LimitedConcurrentExecutor object
+type LimitedConcurrentExecutor struct {
+	limit     int
+	tokenChan chan int
+}
+
+func NewLimitedConcurrentExecutor(limit int) *LimitedConcurrentExecutor {
+
+	// allocate a limiter instance
+	c := &LimitedConcurrentExecutor{
+		limit:     limit,
+		tokenChan: make(chan int, limit),
+	}
+
+	// allocate the tokenChan:
+	for i := 0; i < c.limit; i++ {
+		c.tokenChan <- i
+	}
+
+	return c
+}
+
+// Execute adds a function to the execution queue.
+// if num of go routines allocated by this instance is < limit
+// launch a new go routine to execute job
+// else wait until a go routine becomes available
+func (c *LimitedConcurrentExecutor) Execute(job func()) {
+	token := <-c.tokenChan
+	go func() {
+		defer func() {
+			c.tokenChan <- token
+		}()
+		// run the job
+		job()
+	}()
+}