Merge pull request #87 from chrislusf/master

sync
2024-01-19 02:48:24 +00:00 · 2021-11-11 16:00:21 +08:00 · 2021-11-11 16:00:21 +08:00 · 34240606f7
parent b5389c3b23 835e2d2ddf
commit 34240606f7
81 changed files with 2126 additions and 1304 deletions
--- a/.github/workflows/binaries_dev.yml
+++ b/.github/workflows/binaries_dev.yml
@ -3,6 +3,8 @@ name: "go: build dev binaries"
 on:
  push:
    branches: [ master ]
+  pull_request:
+    branches: [ master ]

 jobs:

@ -36,8 +38,11 @@ jobs:
      - name: Set BUILD_TIME env
        run: echo BUILD_TIME=$(date -u +%Y%m%d-%H%M) >> ${GITHUB_ENV}

+      - name: disable http2 env
+        run: export GODEBUG=http2client=0
+
      - name: Go Release Binaries Large Disk
-        uses: wangyoucao577/go-release-action@v1.20
+        uses: wangyoucao577/go-release-action@bugfix/upload-fail
        with:
          github_token: ${{ secrets.GITHUB_TOKEN }}
          goos: ${{ matrix.goos }}
@ -53,7 +58,7 @@ jobs:
          asset_name: "weed-large-disk-${{ env.BUILD_TIME }}-${{ matrix.goos }}-${{ matrix.goarch }}"

      - name: Go Release Binaries Normal Volume Size
-        uses: wangyoucao577/go-release-action@v1.20
+        uses: wangyoucao577/go-release-action@bugfix/upload-fail
        with:
          github_token: ${{ secrets.GITHUB_TOKEN }}
          goos: ${{ matrix.goos }}
@ -84,7 +89,7 @@ jobs:
        run: echo BUILD_TIME=$(date -u +%Y%m%d-%H%M) >> ${GITHUB_ENV}

      - name: Go Release Binaries Large Disk
-        uses: wangyoucao577/go-release-action@v1.20
+        uses: wangyoucao577/go-release-action@bugfix/upload-fail
        with:
          github_token: ${{ secrets.GITHUB_TOKEN }}
          goos: ${{ matrix.goos }}
@ -100,7 +105,7 @@ jobs:
          asset_name: "weed-large-disk-${{ env.BUILD_TIME }}-${{ matrix.goos }}-${{ matrix.goarch }}"

      - name: Go Release Binaries Normal Volume Size
-        uses: wangyoucao577/go-release-action@v1.20
+        uses: wangyoucao577/go-release-action@bugfix/upload-fail
        with:
          github_token: ${{ secrets.GITHUB_TOKEN }}
          goos: ${{ matrix.goos }}
--- a/backers.md
+++ b/backers.md
@ -5,12 +5,16 @@

 <h2 align="center">Generous Backers ($50+)</h2>

- [4Sight Imaging](https://www.4sightimaging.com/)
 - [Evercam Camera Management Software](https://evercam.io/)
- [Admiral](https://getadmiral.com)

 <h2 align="center">Backers</h2>

 - [ColorfulClouds Tech Co. Ltd.](https://caiyunai.com/)
 - [Haravan - Ecommerce Platform](https://www.haravan.com)
 - PeterCxy - Creator of Shelter App
+- [Hive Games](https://playhive.com/)
+- Flowm
+- Yoni Nakache
+- Catalin Constantin
+- MingLi Yuan
+- Leroy van Logchem
--- a/docker/Dockerfile.go_build
+++ b/docker/Dockerfile.go_build
@ -1,4 +1,4 @@
-FROM amd64/golang:1.17-alpine as builder
+FROM golang:1.17-alpine as builder
 RUN apk add git g++ fuse
 RUN mkdir -p /go/src/github.com/chrislusf/
 RUN git clone https://github.com/chrislusf/seaweedfs /go/src/github.com/chrislusf/seaweedfs
--- a/docker/Dockerfile.go_build_large
+++ b/docker/Dockerfile.go_build_large
@ -1,4 +1,4 @@
-FROM amd64/golang:1.17-alpine as builder
+FROM golang:1.17-alpine as builder
 RUN apk add git g++ fuse
 RUN mkdir -p /go/src/github.com/chrislusf/
 RUN git clone https://github.com/chrislusf/seaweedfs /go/src/github.com/chrislusf/seaweedfs
--- a/k8s/helm_charts2/Chart.yaml
+++ b/k8s/helm_charts2/Chart.yaml
@ -1,5 +1,5 @@
 apiVersion: v1
 description: SeaweedFS
 name: seaweedfs
-appVersion: "2.75"
-version: "2.75"
+appVersion: "2.77"
+version: "2.77"
--- a/k8s/helm_charts2/templates/filer-statefulset.yaml
+++ b/k8s/helm_charts2/templates/filer-statefulset.yaml
@ -133,11 +133,6 @@ spec:
              -encryptVolumeData \
              {{- end }}
              -ip=${POD_IP} \
-              {{- if .Values.filer.enable_peers }}
-              {{- if gt (.Values.filer.replicas | int) 1 }}
-              -peers=$(echo -n "{{ range $index := until (.Values.filer.replicas | int) }}${SEAWEEDFS_FULLNAME}-filer-{{ $index }}.${SEAWEEDFS_FULLNAME}-filer:{{ $.Values.filer.port }}{{ if lt $index (sub ($.Values.filer.replicas | int) 1) }},{{ end }}{{ end }}" | sed "s/$HOSTNAME.${SEAWEEDFS_FULLNAME}-filer:{{ $.Values.filer.port }}//" | sed 's/,$//; 's/^,//'; s/,,/,/;' )  \
-              {{- end }}
-              {{- end }}
              {{- if .Values.filer.s3.enabled }}
              -s3 \
              -s3.port={{ .Values.filer.s3.port }} \
--- a/k8s/helm_charts2/values.yaml
+++ b/k8s/helm_charts2/values.yaml
@ -246,8 +246,6 @@ filer:
  maxMB: null
  # encrypt data on volume servers
  encryptVolumeData: false
-  # enable peers sync metadata, for leveldb (localdb for filer but with sync across)
-  enable_peers: false

  # Whether proxy or redirect to volume server during file GET request
  redirectOnRead: false
--- a/other/java/client/pom.xml
+++ b/other/java/client/pom.xml
@ -5,7 +5,7 @@

    <groupId>com.github.chrislusf</groupId>
    <artifactId>seaweedfs-client</artifactId>
-    <version>1.6.9</version>
+    <version>1.7.0</version>

    <parent>
        <groupId>org.sonatype.oss</groupId>
@ -60,7 +60,7 @@
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpmime</artifactId>
-            <version>4.5.6</version>
+            <version>4.5.13</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
--- a/other/java/client/pom.xml.deploy
+++ b/other/java/client/pom.xml.deploy
@ -5,7 +5,7 @@

    <groupId>com.github.chrislusf</groupId>
    <artifactId>seaweedfs-client</artifactId>
-    <version>1.6.9</version>
+    <version>1.7.0</version>

    <parent>
        <groupId>org.sonatype.oss</groupId>
@ -60,7 +60,7 @@
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpmime</artifactId>
-            <version>4.5.6</version>
+            <version>4.5.13</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
--- a/other/java/client/pom_debug.xml
+++ b/other/java/client/pom_debug.xml
@ -5,7 +5,7 @@

    <groupId>com.github.chrislusf</groupId>
    <artifactId>seaweedfs-client</artifactId>
-    <version>1.6.9</version>
+    <version>1.7.0</version>

    <parent>
        <groupId>org.sonatype.oss</groupId>
@ -60,7 +60,7 @@
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpmime</artifactId>
-            <version>4.5.6</version>
+            <version>4.5.13</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
--- a/other/java/client/src/main/java/seaweedfs/client/RemoteUtil.java
+++ b/other/java/client/src/main/java/seaweedfs/client/RemoteUtil.java
@ -14,10 +14,10 @@ public class RemoteUtil {
        String dir = SeaweedOutputStream.getParentDirectory(fullpath);
        String name = SeaweedOutputStream.getFileName(fullpath);

-        final FilerProto.DownloadToLocalResponse downloadToLocalResponse = filerClient.getBlockingStub()
-                .downloadToLocal(FilerProto.DownloadToLocalRequest.newBuilder()
+        final FilerProto.CacheRemoteObjectToLocalClusterResponse response = filerClient.getBlockingStub()
+                .cacheRemoteObjectToLocalCluster(FilerProto.CacheRemoteObjectToLocalClusterRequest.newBuilder()
                .setDirectory(dir).setName(name).build());

-        return downloadToLocalResponse.getEntry();
+        return response.getEntry();
    }
 }
--- a/other/java/client/src/main/proto/filer.proto
+++ b/other/java/client/src/main/proto/filer.proto
@ -69,7 +69,7 @@ service SeaweedFiler {
    rpc KvPut (KvPutRequest) returns (KvPutResponse) {
    }

-    rpc DownloadToLocal (DownloadToLocalRequest) returns (DownloadToLocalResponse) {
+    rpc CacheRemoteObjectToLocalCluster (CacheRemoteObjectToLocalClusterRequest) returns (CacheRemoteObjectToLocalClusterResponse) {
    }
 }

@ -403,10 +403,10 @@ message FilerConf {
 /////////////////////////
 // Remote Storage related
 /////////////////////////
-message DownloadToLocalRequest {
+message CacheRemoteObjectToLocalClusterRequest {
    string directory = 1;
    string name = 2;
 }
-message DownloadToLocalResponse {
+message CacheRemoteObjectToLocalClusterResponse {
    Entry entry = 1;
 }
--- a/other/java/examples/pom.xml
+++ b/other/java/examples/pom.xml
@ -11,13 +11,13 @@
        <dependency>
            <groupId>com.github.chrislusf</groupId>
            <artifactId>seaweedfs-client</artifactId>
-            <version>1.6.9</version>
+            <version>1.7.0</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>com.github.chrislusf</groupId>
            <artifactId>seaweedfs-hadoop2-client</artifactId>
-            <version>1.6.9</version>
+            <version>1.7.0</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
--- a/other/java/hdfs2/dependency-reduced-pom.xml
+++ b/other/java/hdfs2/dependency-reduced-pom.xml
@ -301,7 +301,7 @@
    </snapshotRepository>
  </distributionManagement>
  <properties>
-    <seaweedfs.client.version>1.6.9</seaweedfs.client.version>
+    <seaweedfs.client.version>1.7.0</seaweedfs.client.version>
    <hadoop.version>2.9.2</hadoop.version>
  </properties>
 </project>
--- a/other/java/hdfs2/pom.xml
+++ b/other/java/hdfs2/pom.xml
@ -5,7 +5,7 @@
    <modelVersion>4.0.0</modelVersion>

    <properties>
-        <seaweedfs.client.version>1.6.9</seaweedfs.client.version>
+        <seaweedfs.client.version>1.7.0</seaweedfs.client.version>
        <hadoop.version>2.9.2</hadoop.version>
    </properties>

--- a/other/java/hdfs3/dependency-reduced-pom.xml
+++ b/other/java/hdfs3/dependency-reduced-pom.xml
@ -309,7 +309,7 @@
    </snapshotRepository>
  </distributionManagement>
  <properties>
-    <seaweedfs.client.version>1.6.9</seaweedfs.client.version>
+    <seaweedfs.client.version>1.7.0</seaweedfs.client.version>
    <hadoop.version>3.1.1</hadoop.version>
  </properties>
 </project>
--- a/other/java/hdfs3/pom.xml
+++ b/other/java/hdfs3/pom.xml
@ -5,7 +5,7 @@
    <modelVersion>4.0.0</modelVersion>

    <properties>
-        <seaweedfs.client.version>1.6.9</seaweedfs.client.version>
+        <seaweedfs.client.version>1.7.0</seaweedfs.client.version>
        <hadoop.version>3.1.1</hadoop.version>
    </properties>

--- a/weed/Makefile
+++ b/weed/Makefile
@ -2,10 +2,13 @@ BINARY = weed

 SOURCE_DIR = .

-all: debug_mount
+all: install

 .PHONY : clean debug_mount

+install:
+	go install
+
 clean:
 	go clean $(SOURCE_DIR)
 	rm -f $(BINARY)
--- a/weed/cluster/cluster.go
+++ b/weed/cluster/cluster.go
@ -0,0 +1,264 @@
+package cluster
+
+import (
+	"github.com/chrislusf/seaweedfs/weed/pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
+	"math"
+	"sync"
+	"time"
+)
+
+const (
+	MasterType = "master"
+	FilerType  = "filer"
+	BrokerType = "broker"
+)
+
+type ClusterNode struct {
+	Address   pb.ServerAddress
+	Version   string
+	counter   int
+	createdTs time.Time
+}
+
+type Leaders struct {
+	leaders [3]pb.ServerAddress
+}
+
+type Cluster struct {
+	filers       map[pb.ServerAddress]*ClusterNode
+	filersLock   sync.RWMutex
+	filerLeaders *Leaders
+	brokers      map[pb.ServerAddress]*ClusterNode
+	brokersLock  sync.RWMutex
+}
+
+func NewCluster() *Cluster {
+	return &Cluster{
+		filers:       make(map[pb.ServerAddress]*ClusterNode),
+		filerLeaders: &Leaders{},
+		brokers:      make(map[pb.ServerAddress]*ClusterNode),
+	}
+}
+
+func (cluster *Cluster) AddClusterNode(nodeType string, address pb.ServerAddress, version string) []*master_pb.KeepConnectedResponse {
+	switch nodeType {
+	case FilerType:
+		cluster.filersLock.Lock()
+		defer cluster.filersLock.Unlock()
+		if existingNode, found := cluster.filers[address]; found {
+			existingNode.counter++
+			return nil
+		}
+		cluster.filers[address] = &ClusterNode{
+			Address:   address,
+			Version:   version,
+			counter:   1,
+			createdTs: time.Now(),
+		}
+		return cluster.ensureFilerLeaders(true, nodeType, address)
+	case BrokerType:
+		cluster.brokersLock.Lock()
+		defer cluster.brokersLock.Unlock()
+		if existingNode, found := cluster.brokers[address]; found {
+			existingNode.counter++
+			return nil
+		}
+		cluster.brokers[address] = &ClusterNode{
+			Address:   address,
+			Version:   version,
+			counter:   1,
+			createdTs: time.Now(),
+		}
+		return []*master_pb.KeepConnectedResponse{
+			{
+				ClusterNodeUpdate: &master_pb.ClusterNodeUpdate{
+					NodeType: nodeType,
+					Address:  string(address),
+					IsAdd:    true,
+				},
+			},
+		}
+	case MasterType:
+	}
+	return nil
+}
+
+func (cluster *Cluster) RemoveClusterNode(nodeType string, address pb.ServerAddress) []*master_pb.KeepConnectedResponse {
+	switch nodeType {
+	case FilerType:
+		cluster.filersLock.Lock()
+		defer cluster.filersLock.Unlock()
+		if existingNode, found := cluster.filers[address]; !found {
+			return nil
+		} else {
+			existingNode.counter--
+			if existingNode.counter <= 0 {
+				delete(cluster.filers, address)
+				return cluster.ensureFilerLeaders(false, nodeType, address)
+			}
+		}
+	case BrokerType:
+		cluster.brokersLock.Lock()
+		defer cluster.brokersLock.Unlock()
+		if existingNode, found := cluster.brokers[address]; !found {
+			return nil
+		} else {
+			existingNode.counter--
+			if existingNode.counter <= 0 {
+				delete(cluster.brokers, address)
+				return []*master_pb.KeepConnectedResponse{
+					{
+						ClusterNodeUpdate: &master_pb.ClusterNodeUpdate{
+							NodeType: nodeType,
+							Address:  string(address),
+							IsAdd:    false,
+						},
+					},
+				}
+			}
+		}
+	case MasterType:
+	}
+	return nil
+}
+
+func (cluster *Cluster) ListClusterNode(nodeType string) (nodes []*ClusterNode) {
+	switch nodeType {
+	case FilerType:
+		cluster.filersLock.RLock()
+		defer cluster.filersLock.RUnlock()
+		for _, node := range cluster.filers {
+			nodes = append(nodes, node)
+		}
+	case BrokerType:
+		cluster.brokersLock.RLock()
+		defer cluster.brokersLock.RUnlock()
+		for _, node := range cluster.brokers {
+			nodes = append(nodes, node)
+		}
+	case MasterType:
+	}
+	return
+}
+
+func (cluster *Cluster) IsOneLeader(address pb.ServerAddress) bool {
+	return cluster.filerLeaders.isOneLeader(address)
+}
+
+func (cluster *Cluster) ensureFilerLeaders(isAdd bool, nodeType string, address pb.ServerAddress) (result []*master_pb.KeepConnectedResponse) {
+	if isAdd {
+		if cluster.filerLeaders.addLeaderIfVacant(address) {
+			// has added the address as one leader
+			result = append(result, &master_pb.KeepConnectedResponse{
+				ClusterNodeUpdate: &master_pb.ClusterNodeUpdate{
+					NodeType: nodeType,
+					Address:  string(address),
+					IsLeader: true,
+					IsAdd:    true,
+				},
+			})
+		} else {
+			result = append(result, &master_pb.KeepConnectedResponse{
+				ClusterNodeUpdate: &master_pb.ClusterNodeUpdate{
+					NodeType: nodeType,
+					Address:  string(address),
+					IsLeader: false,
+					IsAdd:    true,
+				},
+			})
+		}
+	} else {
+		if cluster.filerLeaders.removeLeaderIfExists(address) {
+
+			result = append(result, &master_pb.KeepConnectedResponse{
+				ClusterNodeUpdate: &master_pb.ClusterNodeUpdate{
+					NodeType: nodeType,
+					Address:  string(address),
+					IsLeader: true,
+					IsAdd:    false,
+				},
+			})
+
+			// pick the freshest one, since it is less likely to go away
+			var shortestDuration int64 = math.MaxInt64
+			now := time.Now()
+			var candidateAddress pb.ServerAddress
+			for _, node := range cluster.filers {
+				if cluster.filerLeaders.isOneLeader(node.Address) {
+					continue
+				}
+				duration := now.Sub(node.createdTs).Nanoseconds()
+				if duration < shortestDuration {
+					shortestDuration = duration
+					candidateAddress = node.Address
+				}
+			}
+			if candidateAddress != "" {
+				cluster.filerLeaders.addLeaderIfVacant(candidateAddress)
+				// added a new leader
+				result = append(result, &master_pb.KeepConnectedResponse{
+					ClusterNodeUpdate: &master_pb.ClusterNodeUpdate{
+						NodeType: nodeType,
+						Address:  string(candidateAddress),
+						IsLeader: true,
+						IsAdd:    true,
+					},
+				})
+			}
+		} else {
+			result = append(result, &master_pb.KeepConnectedResponse{
+				ClusterNodeUpdate: &master_pb.ClusterNodeUpdate{
+					NodeType: nodeType,
+					Address:  string(address),
+					IsLeader: false,
+					IsAdd:    false,
+				},
+			})
+		}
+	}
+	return
+}
+
+func (leaders *Leaders) addLeaderIfVacant(address pb.ServerAddress) (hasChanged bool) {
+	if leaders.isOneLeader(address) {
+		return
+	}
+	for i := 0; i < len(leaders.leaders); i++ {
+		if leaders.leaders[i] == "" {
+			leaders.leaders[i] = address
+			hasChanged = true
+			return
+		}
+	}
+	return
+}
+func (leaders *Leaders) removeLeaderIfExists(address pb.ServerAddress) (hasChanged bool) {
+	if !leaders.isOneLeader(address) {
+		return
+	}
+	for i := 0; i < len(leaders.leaders); i++ {
+		if leaders.leaders[i] == address {
+			leaders.leaders[i] = ""
+			hasChanged = true
+			return
+		}
+	}
+	return
+}
+func (leaders *Leaders) isOneLeader(address pb.ServerAddress) bool {
+	for i := 0; i < len(leaders.leaders); i++ {
+		if leaders.leaders[i] == address {
+			return true
+		}
+	}
+	return false
+}
+func (leaders *Leaders) GetLeaders() (addresses []pb.ServerAddress) {
+	for i := 0; i < len(leaders.leaders); i++ {
+		if leaders.leaders[i] != "" {
+			addresses = append(addresses, leaders.leaders[i])
+		}
+	}
+	return
+}
--- a/weed/cluster/cluster_test.go
+++ b/weed/cluster/cluster_test.go
@ -0,0 +1,47 @@
+package cluster
+
+import (
+	"github.com/chrislusf/seaweedfs/weed/pb"
+	"github.com/stretchr/testify/assert"
+	"testing"
+)
+
+func TestClusterAddRemoveNodes(t *testing.T) {
+	c := NewCluster()
+
+	c.AddClusterNode("filer", pb.ServerAddress("111:1"), "23.45")
+	c.AddClusterNode("filer", pb.ServerAddress("111:2"), "23.45")
+	assert.Equal(t, []pb.ServerAddress{
+		pb.ServerAddress("111:1"),
+		pb.ServerAddress("111:2"),
+	}, c.filerLeaders.GetLeaders())
+
+	c.AddClusterNode("filer", pb.ServerAddress("111:3"), "23.45")
+	c.AddClusterNode("filer", pb.ServerAddress("111:4"), "23.45")
+	assert.Equal(t, []pb.ServerAddress{
+		pb.ServerAddress("111:1"),
+		pb.ServerAddress("111:2"),
+		pb.ServerAddress("111:3"),
+	}, c.filerLeaders.GetLeaders())
+
+	c.AddClusterNode("filer", pb.ServerAddress("111:5"), "23.45")
+	c.AddClusterNode("filer", pb.ServerAddress("111:6"), "23.45")
+	c.RemoveClusterNode("filer", pb.ServerAddress("111:4"))
+	assert.Equal(t, []pb.ServerAddress{
+		pb.ServerAddress("111:1"),
+		pb.ServerAddress("111:2"),
+		pb.ServerAddress("111:3"),
+	}, c.filerLeaders.GetLeaders())
+
+	// remove oldest
+	c.RemoveClusterNode("filer", pb.ServerAddress("111:1"))
+	assert.Equal(t, []pb.ServerAddress{
+		pb.ServerAddress("111:6"),
+		pb.ServerAddress("111:2"),
+		pb.ServerAddress("111:3"),
+	}, c.filerLeaders.GetLeaders())
+
+	// remove oldest
+	c.RemoveClusterNode("filer", pb.ServerAddress("111:1"))
+
+}
--- a/weed/command/filer.go
+++ b/weed/command/filer.go
@ -4,7 +4,6 @@ import (
 	"fmt"
 	"net/http"
 	"os"
-	"strings"
 	"time"

 	"google.golang.org/grpc/reflection"
@ -46,7 +45,6 @@ type FilerOptions struct {
 	enableNotification      *bool
 	disableHttp             *bool
 	cipher                  *bool
-	peers                   *string
 	metricsHttpPort         *int
 	saveToFilerLimit        *int
 	defaultLevelDbDirectory *string
@ -72,7 +70,6 @@ func init() {
 	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")
 	f.metricsHttpPort = cmdFiler.Flag.Int("metricsPort", 0, "Prometheus metrics listen port")
 	f.saveToFilerLimit = cmdFiler.Flag.Int("saveToFilerLimit", 0, "files smaller than this limit will be saved in filer store")
 	f.defaultLevelDbDirectory = cmdFiler.Flag.String("defaultStoreDir", ".", "if filer.toml is empty, use an embedded filer store in the directory")
@ -186,11 +183,6 @@ func (fo *FilerOptions) startFiler() {

 	defaultLevelDbDirectory := util.ResolvePath(*fo.defaultLevelDbDirectory + "/filerldb2")

-	var peers []string
-	if *fo.peers != "" {
-		peers = strings.Split(*fo.peers, ",")
-	}
-
 	filerAddress := pb.NewServerAddress(*fo.ip, *fo.port, *fo.portGrpc)

 	fs, nfs_err := weed_server.NewFilerServer(defaultMux, publicVolumeMux, &weed_server.FilerOption{
@ -207,7 +199,6 @@ func (fo *FilerOptions) startFiler() {
 		Host:                  filerAddress,
 		Cipher:                *fo.cipher,
 		SaveToFilerLimit:      int64(*fo.saveToFilerLimit),
-		Filers:                pb.FromAddressStrings(peers),
 		ConcurrentUploadLimit: int64(*fo.concurrentUploadLimitMB) * 1024 * 1024,
 	})
 	if nfs_err != nil {
--- a/weed/command/filer_meta_tail.go
+++ b/weed/command/filer_meta_tail.go
@ -30,6 +30,8 @@ var cmdFilerMetaTail = &Command{
 	weed filer.meta.tail -timeAgo=30h | jq .
 	weed filer.meta.tail -timeAgo=30h | jq .eventNotification.newEntry.name

+	weed filer.meta.tail -timeAgo=30h -es=http://<elasticSearchServerHost>:<port> -es.index=seaweedfs
+
  `,
 }

--- a/weed/command/server.go
+++ b/weed/command/server.go
@ -106,7 +106,6 @@ func init() {
 	filerOptions.maxMB = cmdServer.Flag.Int("filer.maxMB", 4, "split files larger than the limit")
 	filerOptions.dirListingLimit = cmdServer.Flag.Int("filer.dirListLimit", 1000, "limit sub dir listing size")
 	filerOptions.cipher = cmdServer.Flag.Bool("filer.encryptVolumeData", false, "encrypt data on volume servers")
-	filerOptions.peers = cmdServer.Flag.String("filer.peers", "", "all filers sharing the same filer store in comma separated ip:port list")
 	filerOptions.saveToFilerLimit = cmdServer.Flag.Int("filer.saveToFilerLimit", 0, "Small files smaller than this limit can be cached in filer store.")
 	filerOptions.concurrentUploadLimitMB = cmdServer.Flag.Int("filer.concurrentUploadLimitMB", 64, "limit total concurrent upload size")

--- a/weed/command/shell.go
+++ b/weed/command/shell.go
@ -37,7 +37,7 @@ func runShell(command *Command, args []string) bool {
 	util.LoadConfiguration("security", false)
 	shellOptions.GrpcDialOption = security.LoadClientTLS(util.GetViper(), "grpc.client")

-	if *shellOptions.Masters == "" && *shellInitialFiler == "" {
+	if *shellOptions.Masters == "" {
 		util.LoadConfiguration("shell", false)
 		v := util.GetViper()
 		cluster := v.GetString("cluster.default")
@ -45,15 +45,14 @@ func runShell(command *Command, args []string) bool {
 			cluster = *shellCluster
 		}
 		if cluster == "" {
-			*shellOptions.Masters, *shellInitialFiler = "localhost:9333", "localhost:8888"
+			*shellOptions.Masters = "localhost:9333"
 		} else {
 			*shellOptions.Masters = v.GetString("cluster." + cluster + ".master")
 			*shellInitialFiler = v.GetString("cluster." + cluster + ".filer")
+			fmt.Printf("master: %s filer: %s\n", *shellOptions.Masters, *shellInitialFiler)
 		}
 	}

-	fmt.Printf("master: %s filer: %s\n", *shellOptions.Masters, *shellInitialFiler)
-
 	shellOptions.FilerAddress = pb.ServerAddress(*shellInitialFiler)
 	shellOptions.Directory = "/"

--- a/weed/filer/filechunk_manifest.go
+++ b/weed/filer/filechunk_manifest.go
@ -6,6 +6,7 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/wdclient"
 	"io"
 	"math"
+	"math/rand"
 	"net/url"
 	"strings"
 	"time"
@ -142,6 +143,9 @@ func retriedStreamFetchChunkData(writer io.Writer, urlStrings []string, cipherKe
 	var shouldRetry bool
 	var totalWritten int

+	rand.Shuffle(len(urlStrings), func(i, j int) {
+		urlStrings[i], urlStrings[j] = urlStrings[j], urlStrings[i]
+	})
 	for waitTime := time.Second; waitTime < util.RetryWaitTime; waitTime += waitTime / 2 {
 		for _, urlString := range urlStrings {
 			var localProcesed int
--- a/weed/filer/filechunks_read.go
+++ b/weed/filer/filechunks_read.go
@ -40,7 +40,7 @@ func readResolvedChunks(chunks []*filer_pb.FileChunk) (visibles []VisibleInterva
 	for _, point := range points {
 		if point.isStart {
 			if len(queue) > 0 {
-				lastIndex := len(queue) -1
+				lastIndex := len(queue) - 1
 				lastPoint := queue[lastIndex]
 				if point.x != prevX && lastPoint.ts < point.ts {
 					visibles = addToVisibles(visibles, prevX, lastPoint, point)
--- a/weed/filer/filechunks_read_test.go
+++ b/weed/filer/filechunks_read_test.go
@ -52,7 +52,7 @@ func TestReadResolvedChunks(t *testing.T) {

 func TestRandomizedReadResolvedChunks(t *testing.T) {

-	var limit int64 = 1024*1024
+	var limit int64 = 1024 * 1024
 	array := make([]int64, limit)
 	var chunks []*filer_pb.FileChunk
 	for ts := int64(0); ts < 1024; ts++ {
@ -75,7 +75,7 @@ func TestRandomizedReadResolvedChunks(t *testing.T) {
 	visibles := readResolvedChunks(chunks)

 	for _, visible := range visibles {
-		for i := visible.start; i<visible.stop;i++{
+		for i := visible.start; i < visible.stop; i++ {
 			if array[i] != visible.modifiedTime {
 				t.Errorf("position %d expected ts %d actual ts %d", i, array[i], visible.modifiedTime)
 			}
@ -101,12 +101,12 @@ func randomWrite(array []int64, start int64, size int64, ts int64) *filer_pb.Fil

 func TestSequentialReadResolvedChunks(t *testing.T) {

-	var chunkSize int64 = 1024*1024*2
+	var chunkSize int64 = 1024 * 1024 * 2
 	var chunks []*filer_pb.FileChunk
 	for ts := int64(0); ts < 13; ts++ {
 		chunks = append(chunks, &filer_pb.FileChunk{
 			FileId: "",
-			Offset: chunkSize*ts,
+			Offset: chunkSize * ts,
 			Size:   uint64(chunkSize),
 			Mtime:  1,
 		})
--- a/weed/filer/filer.go
+++ b/weed/filer/filer.go
@ -3,7 +3,9 @@ package filer
 import (
 	"context"
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/cluster"
 	"github.com/chrislusf/seaweedfs/weed/pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
 	"os"
 	"strings"
 	"time"
@ -50,7 +52,7 @@ type Filer struct {
 func NewFiler(masters []pb.ServerAddress, grpcDialOption grpc.DialOption,
 	filerHost pb.ServerAddress, collection string, replication string, dataCenter string, notifyFn func()) *Filer {
 	f := &Filer{
-		MasterClient:        wdclient.NewMasterClient(grpcDialOption, "filer", filerHost, dataCenter, masters),
+		MasterClient:        wdclient.NewMasterClient(grpcDialOption, cluster.FilerType, filerHost, dataCenter, masters),
 		fileIdDeletionQueue: util.NewUnboundedQueue(),
 		GrpcDialOption:      grpcDialOption,
 		FilerConf:           NewFilerConf(),
@ -66,22 +68,38 @@ func NewFiler(masters []pb.ServerAddress, grpcDialOption grpc.DialOption,
 	return f
 }

-func (f *Filer) AggregateFromPeers(self pb.ServerAddress, filers []pb.ServerAddress) {
+func (f *Filer) AggregateFromPeers(self pb.ServerAddress) {

-	// set peers
-	found := false
-	for _, peer := range filers {
-		if peer == self {
-			found = true
+	f.MetaAggregator = NewMetaAggregator(f, self, f.GrpcDialOption)
+	f.MasterClient.OnPeerUpdate = f.MetaAggregator.OnPeerUpdate
+
+	for _, peerUpdate := range f.ListExistingPeerUpdates() {
+		f.MetaAggregator.OnPeerUpdate(peerUpdate)
+	}
+
+}
+
+func (f *Filer) ListExistingPeerUpdates() (existingNodes []*master_pb.ClusterNodeUpdate){
+
+	if grpcErr := pb.WithMasterClient(f.MasterClient.GetMaster(), f.GrpcDialOption, func(client master_pb.SeaweedClient) error {
+		resp, err := client.ListClusterNodes(context.Background(), &master_pb.ListClusterNodesRequest{
+			ClientType: cluster.FilerType,
+		})
+
+		glog.V(0).Infof("the cluster has %d filers\n", len(resp.ClusterNodes))
+		for _, node := range resp.ClusterNodes {
+			existingNodes = append(existingNodes, &master_pb.ClusterNodeUpdate{
+				NodeType: cluster.FilerType,
+				Address:  node.Address,
+				IsLeader: node.IsLeader,
+				IsAdd:    true,
+			})
 		}
+		return err
+	}); grpcErr != nil {
+		glog.V(0).Infof("connect to %s: %v", f.MasterClient.GetMaster(), grpcErr)
 	}
-	if !found {
-		filers = append(filers, self)
-	}
-
-	f.MetaAggregator = NewMetaAggregator(filers, f.GrpcDialOption)
-	f.MetaAggregator.StartLoopSubscribe(f, self)
-
+	return
 }

 func (f *Filer) SetStore(store FilerStore) {
@ -117,7 +135,7 @@ func (fs *Filer) GetMaster() pb.ServerAddress {
 	return fs.MasterClient.GetMaster()
 }

-func (fs *Filer) KeepConnectedToMaster() {
+func (fs *Filer) KeepMasterClientConnected() {
 	fs.MasterClient.KeepConnectedToMaster()
 }

--- a/weed/filer/filer_delete_entry.go
+++ b/weed/filer/filer_delete_entry.go
@ -15,6 +15,9 @@ const (
 	MsgFailDelNonEmptyFolder = "fail to delete non-empty folder"
 )

+type OnChunksFunc func([]*filer_pb.FileChunk) error
+type OnHardLinkIdsFunc func([]HardLinkId) error
+
 func (f *Filer) DeleteEntryMetaAndData(ctx context.Context, p util.FullPath, isRecursive, ignoreRecursiveError, shouldDeleteChunks, isFromOtherCluster bool, signatures []int32) (err error) {
 	if p == "/" {
 		return nil
@ -27,20 +30,29 @@ func (f *Filer) DeleteEntryMetaAndData(ctx context.Context, p util.FullPath, isR

 	isDeleteCollection := f.isBucket(entry)

-	var chunks []*filer_pb.FileChunk
-	var hardLinkIds []HardLinkId
-	chunks = append(chunks, entry.Chunks...)
 	if entry.IsDirectory() {
 		// delete the folder children, not including the folder itself
-		var dirChunks []*filer_pb.FileChunk
-		var dirHardLinkIds []HardLinkId
-		dirChunks, dirHardLinkIds, err = f.doBatchDeleteFolderMetaAndData(ctx, entry, isRecursive, ignoreRecursiveError, shouldDeleteChunks && !isDeleteCollection, isDeleteCollection, isFromOtherCluster, signatures)
+		err = f.doBatchDeleteFolderMetaAndData(ctx, entry, isRecursive, ignoreRecursiveError, shouldDeleteChunks && !isDeleteCollection, isDeleteCollection, isFromOtherCluster, signatures, func(chunks []*filer_pb.FileChunk) error {
+			if shouldDeleteChunks && !isDeleteCollection {
+				f.DirectDeleteChunks(chunks)
+			}
+			return nil
+		}, func(hardLinkIds []HardLinkId) error {
+			// A case not handled:
+			// what if the chunk is in a different collection?
+			if shouldDeleteChunks {
+				f.maybeDeleteHardLinks(hardLinkIds)
+			}
+			return nil
+		})
 		if err != nil {
 			glog.V(0).Infof("delete directory %s: %v", p, err)
 			return fmt.Errorf("delete directory %s: %v", p, err)
 		}
-		chunks = append(chunks, dirChunks...)
-		hardLinkIds = append(hardLinkIds, dirHardLinkIds...)
+	}
+
+	if shouldDeleteChunks && !isDeleteCollection {
+		f.DirectDeleteChunks(entry.Chunks)
 	}

 	// delete the file or folder
@ -49,15 +61,6 @@ func (f *Filer) DeleteEntryMetaAndData(ctx context.Context, p util.FullPath, isR
 		return fmt.Errorf("delete file %s: %v", p, err)
 	}

-	if shouldDeleteChunks && !isDeleteCollection {
-		f.DirectDeleteChunks(chunks)
-	}
-	// A case not handled:
-	// what if the chunk is in a different collection?
-	if shouldDeleteChunks {
-		f.maybeDeleteHardLinks(hardLinkIds)
-	}
-
 	if isDeleteCollection {
 		collectionName := entry.Name()
 		f.doDeleteCollection(collectionName)
@ -67,7 +70,7 @@ func (f *Filer) DeleteEntryMetaAndData(ctx context.Context, p util.FullPath, isR
 	return nil
 }

-func (f *Filer) doBatchDeleteFolderMetaAndData(ctx context.Context, entry *Entry, isRecursive, ignoreRecursiveError, shouldDeleteChunks, isDeletingBucket, isFromOtherCluster bool, signatures []int32) (chunks []*filer_pb.FileChunk, hardlinkIds []HardLinkId, err error) {
+func (f *Filer) doBatchDeleteFolderMetaAndData(ctx context.Context, entry *Entry, isRecursive, ignoreRecursiveError, shouldDeleteChunks, isDeletingBucket, isFromOtherCluster bool, signatures []int32, onChunksFn OnChunksFunc, onHardLinkIdsFn OnHardLinkIdsFunc) (err error) {

 	lastFileName := ""
 	includeLastFile := false
@ -76,34 +79,30 @@ func (f *Filer) doBatchDeleteFolderMetaAndData(ctx context.Context, entry *Entry
 			entries, _, err := f.ListDirectoryEntries(ctx, entry.FullPath, lastFileName, includeLastFile, PaginationSize, "", "", "")
 			if err != nil {
 				glog.Errorf("list folder %s: %v", entry.FullPath, err)
-				return nil, nil, fmt.Errorf("list folder %s: %v", entry.FullPath, err)
+				return fmt.Errorf("list folder %s: %v", entry.FullPath, err)
 			}
 			if lastFileName == "" && !isRecursive && len(entries) > 0 {
 				// only for first iteration in the loop
-				glog.Errorf("deleting a folder %s has children: %+v ...", entry.FullPath, entries[0].Name())
-				return nil, nil, fmt.Errorf("%s: %s", MsgFailDelNonEmptyFolder, entry.FullPath)
+				glog.V(0).Infof("deleting a folder %s has children: %+v ...", entry.FullPath, entries[0].Name())
+				return fmt.Errorf("%s: %s", MsgFailDelNonEmptyFolder, entry.FullPath)
 			}

 			for _, sub := range entries {
 				lastFileName = sub.Name()
-				var dirChunks []*filer_pb.FileChunk
-				var dirHardLinkIds []HardLinkId
 				if sub.IsDirectory() {
 					subIsDeletingBucket := f.isBucket(sub)
-					dirChunks, dirHardLinkIds, err = f.doBatchDeleteFolderMetaAndData(ctx, sub, isRecursive, ignoreRecursiveError, shouldDeleteChunks, subIsDeletingBucket, false, nil)
-					chunks = append(chunks, dirChunks...)
-					hardlinkIds = append(hardlinkIds, dirHardLinkIds...)
+					err = f.doBatchDeleteFolderMetaAndData(ctx, sub, isRecursive, ignoreRecursiveError, shouldDeleteChunks, subIsDeletingBucket, false, nil, onChunksFn, onHardLinkIdsFn)
 				} else {
 					f.NotifyUpdateEvent(ctx, sub, nil, shouldDeleteChunks, isFromOtherCluster, nil)
 					if len(sub.HardLinkId) != 0 {
 						// hard link chunk data are deleted separately
-						hardlinkIds = append(hardlinkIds, sub.HardLinkId)
+						err = onHardLinkIdsFn([]HardLinkId{sub.HardLinkId})
 					} else {
-						chunks = append(chunks, sub.Chunks...)
+						err = onChunksFn(sub.Chunks)
 					}
 				}
 				if err != nil && !ignoreRecursiveError {
-					return nil, nil, err
+					return err
 				}
 			}

@ -113,15 +112,15 @@ func (f *Filer) doBatchDeleteFolderMetaAndData(ctx context.Context, entry *Entry
 		}
 	}

-	glog.V(3).Infof("deleting directory %v delete %d chunks: %v", entry.FullPath, len(chunks), shouldDeleteChunks)
+	glog.V(3).Infof("deleting directory %v delete chunks: %v", entry.FullPath, shouldDeleteChunks)

 	if storeDeletionErr := f.Store.DeleteFolderChildren(ctx, entry.FullPath); storeDeletionErr != nil {
-		return nil, nil, fmt.Errorf("filer store delete: %v", storeDeletionErr)
+		return fmt.Errorf("filer store delete: %v", storeDeletionErr)
 	}

 	f.NotifyUpdateEvent(ctx, entry, nil, shouldDeleteChunks, isFromOtherCluster, signatures)

-	return chunks, hardlinkIds, nil
+	return nil
 }

 func (f *Filer) doDeleteEntryMetaAndData(ctx context.Context, entry *Entry, shouldDeleteChunks bool, isFromOtherCluster bool, signatures []int32) (err error) {
--- a/weed/filer/meta_aggregator.go
+++ b/weed/filer/meta_aggregator.go
@ -3,6 +3,8 @@ package filer
 import (
 	"context"
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/cluster"
+	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
 	"github.com/chrislusf/seaweedfs/weed/util"
 	"io"
 	"sync"
@ -18,9 +20,13 @@ import (
 )

 type MetaAggregator struct {
-	filers         []pb.ServerAddress
-	grpcDialOption grpc.DialOption
-	MetaLogBuffer  *log_buffer.LogBuffer
+	filer           *Filer
+	self            pb.ServerAddress
+	isLeader        bool
+	grpcDialOption  grpc.DialOption
+	MetaLogBuffer   *log_buffer.LogBuffer
+	peerStatues     map[pb.ServerAddress]struct{}
+	peerStatuesLock sync.Mutex
 	// notifying clients
 	ListenersLock sync.Mutex
 	ListenersCond *sync.Cond
@ -28,10 +34,12 @@ type MetaAggregator struct {

 // MetaAggregator only aggregates data "on the fly". The logs are not re-persisted to disk.
 // The old data comes from what each LocalMetadata persisted on disk.
-func NewMetaAggregator(filers []pb.ServerAddress, grpcDialOption grpc.DialOption) *MetaAggregator {
+func NewMetaAggregator(filer *Filer, self pb.ServerAddress, grpcDialOption grpc.DialOption) *MetaAggregator {
 	t := &MetaAggregator{
-		filers:         filers,
+		filer:          filer,
+		self:           self,
 		grpcDialOption: grpcDialOption,
+		peerStatues:    make(map[pb.ServerAddress]struct{}),
 	}
 	t.ListenersCond = sync.NewCond(&t.ListenersLock)
 	t.MetaLogBuffer = log_buffer.NewLogBuffer("aggr", LogFlushInterval, nil, func() {
@ -40,10 +48,35 @@ func NewMetaAggregator(filers []pb.ServerAddress, grpcDialOption grpc.DialOption
 	return t
 }

-func (ma *MetaAggregator) StartLoopSubscribe(f *Filer, self pb.ServerAddress) {
-	for _, filer := range ma.filers {
-		go ma.subscribeToOneFiler(f, self, filer)
+func (ma *MetaAggregator) OnPeerUpdate(update *master_pb.ClusterNodeUpdate) {
+	if update.NodeType != cluster.FilerType {
+		return
 	}
+
+	address := pb.ServerAddress(update.Address)
+	if update.IsAdd {
+		// every filer should subscribe to a new filer
+		ma.setActive(address, true)
+		go ma.subscribeToOneFiler(ma.filer, ma.self, address)
+	} else {
+		ma.setActive(address, false)
+	}
+}
+
+func (ma *MetaAggregator) setActive(address pb.ServerAddress, isActive bool) {
+	ma.peerStatuesLock.Lock()
+	defer ma.peerStatuesLock.Unlock()
+	if isActive {
+		ma.peerStatues[address] = struct{}{}
+	} else {
+		delete(ma.peerStatues, address)
+	}
+}
+func (ma *MetaAggregator) isActive(address pb.ServerAddress)(isActive bool) {
+	ma.peerStatuesLock.Lock()
+	defer ma.peerStatuesLock.Unlock()
+	_, isActive = ma.peerStatues[address]
+	return
 }

 func (ma *MetaAggregator) subscribeToOneFiler(f *Filer, self pb.ServerAddress, peer pb.ServerAddress) {
@ -149,6 +182,10 @@ func (ma *MetaAggregator) subscribeToOneFiler(f *Filer, self pb.ServerAddress, p

 			}
 		})
+		if !ma.isActive(peer) {
+			glog.V(0).Infof("stop subscribing remote %s meta change", peer)
+			return
+		}
 		if err != nil {
 			glog.V(0).Infof("subscribing remote %s meta change: %v", peer, err)
 			time.Sleep(1733 * time.Millisecond)
--- a/weed/filer/read_remote.go
+++ b/weed/filer/read_remote.go
@ -25,9 +25,9 @@ func MapRemoteStorageLocationPathToFullPath(localMountedDir util.FullPath, remot
 	return localMountedDir.Child(remoteLocationPath[len(remoteMountedLocation.Path):])
 }

-func DownloadToLocal(filerClient filer_pb.FilerClient, remoteConf *remote_pb.RemoteConf, remoteLocation *remote_pb.RemoteStorageLocation, parent util.FullPath, entry *filer_pb.Entry) error {
+func CacheRemoteObjectToLocalCluster(filerClient filer_pb.FilerClient, remoteConf *remote_pb.RemoteConf, remoteLocation *remote_pb.RemoteStorageLocation, parent util.FullPath, entry *filer_pb.Entry) error {
 	return filerClient.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
-		_, err := client.DownloadToLocal(context.Background(), &filer_pb.DownloadToLocalRequest{
+		_, err := client.CacheRemoteObjectToLocalCluster(context.Background(), &filer_pb.CacheRemoteObjectToLocalClusterRequest{
 			Directory: string(parent),
 			Name:      entry.Name,
 		})
--- a/weed/filer/redis2/universal_redis_store.go
+++ b/weed/filer/redis2/universal_redis_store.go
@ -134,8 +134,8 @@ func (store *UniversalRedis2Store) DeleteFolderChildren(ctx context.Context, ful
 	}

 	members, err := store.Client.ZRangeByLex(ctx, genDirectoryListKey(string(fullpath)), &redis.ZRangeBy{
-		Min:    "-",
-		Max:    "+",
+		Min: "-",
+		Max: "+",
 	}).Result()
 	if err != nil {
 		return fmt.Errorf("DeleteFolderChildren %s : %v", fullpath, err)
--- a/weed/filesys/dir_rename.go
+++ b/weed/filesys/dir_rename.go
@ -67,7 +67,6 @@ func (dir *Dir) Rename(ctx context.Context, req *fuse.RenameRequest, newDirector
 	return nil
 }

-
 func (dir *Dir) handleRenameResponse(ctx context.Context, resp *filer_pb.StreamRenameEntryResponse) error {
 	// comes from filer StreamRenameEntry, can only be create or delete entry

@ -119,7 +118,7 @@ func (dir *Dir) handleRenameResponse(ctx context.Context, resp *filer_pb.StreamR
 		}
 		dir.wfs.handlesLock.Unlock()

-	}else if resp.EventNotification.OldEntry != nil {
+	} else if resp.EventNotification.OldEntry != nil {
 		// without new entry, only old entry name exists. This is the second step to delete old entry
 		if err := dir.wfs.metaCache.AtomicUpdateEntryFromFiler(ctx, util.NewFullPath(resp.Directory, resp.EventNotification.OldEntry.Name), nil); err != nil {
 			return err
--- a/weed/filesys/file.go
+++ b/weed/filesys/file.go
@ -364,15 +364,15 @@ func (file *File) getEntry() *filer_pb.Entry {
 func (file *File) downloadRemoteEntry(entry *filer_pb.Entry) (*filer_pb.Entry, error) {
 	err := file.wfs.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {

-		request := &filer_pb.DownloadToLocalRequest{
+		request := &filer_pb.CacheRemoteObjectToLocalClusterRequest{
 			Directory: file.dir.FullPath(),
 			Name:      entry.Name,
 		}

 		glog.V(4).Infof("download entry: %v", request)
-		resp, err := client.DownloadToLocal(context.Background(), request)
+		resp, err := client.CacheRemoteObjectToLocalCluster(context.Background(), request)
 		if err != nil {
-			glog.Errorf("DownloadToLocal file %s/%s: %v", file.dir.FullPath(), file.Name, err)
+			glog.Errorf("CacheRemoteObjectToLocalCluster file %s/%s: %v", file.dir.FullPath(), file.Name, err)
 			return fuse.EIO
 		}

--- a/weed/iamapi/iamapi_handlers.go
+++ b/weed/iamapi/iamapi_handlers.go
@ -8,7 +8,7 @@ import (
 	"net/http"
 )

-func writeIamErrorResponse(w http.ResponseWriter, err error, object string, value string, msg error) {
+func writeIamErrorResponse(w http.ResponseWriter, r *http.Request, err error, object string, value string, msg error) {
 	errCode := err.Error()
 	errorResp := ErrorResponse{}
 	errorResp.Error.Type = "Sender"
@ -22,10 +22,10 @@ func writeIamErrorResponse(w http.ResponseWriter, err error, object string, valu
 	case iam.ErrCodeNoSuchEntityException:
 		msg := fmt.Sprintf("The %s with name %s cannot be found.", object, value)
 		errorResp.Error.Message = &msg
-		s3err.WriteXMLResponse(w, http.StatusNotFound, errorResp)
+		s3err.WriteXMLResponse(w, r, http.StatusNotFound, errorResp)
 	case iam.ErrCodeServiceFailureException:
-		s3err.WriteXMLResponse(w, http.StatusInternalServerError, errorResp)
+		s3err.WriteXMLResponse(w, r, http.StatusInternalServerError, errorResp)
 	default:
-		s3err.WriteXMLResponse(w, http.StatusInternalServerError, errorResp)
+		s3err.WriteXMLResponse(w, r, http.StatusInternalServerError, errorResp)
 	}
 }
--- a/weed/iamapi/iamapi_management_handlers.go
+++ b/weed/iamapi/iamapi_management_handlers.go
@ -362,7 +362,7 @@ func (iama *IamApiServer) DeleteAccessKey(s3cfg *iam_pb.S3ApiConfiguration, valu

 func (iama *IamApiServer) DoActions(w http.ResponseWriter, r *http.Request) {
 	if err := r.ParseForm(); err != nil {
-		s3err.WriteErrorResponse(w, s3err.ErrInvalidRequest, r)
+		s3err.WriteErrorResponse(w, r, s3err.ErrInvalidRequest)
 		return
 	}
 	values := r.PostForm
@ -370,7 +370,7 @@ func (iama *IamApiServer) DoActions(w http.ResponseWriter, r *http.Request) {
 	s3cfgLock.RLock()
 	s3cfg := &iam_pb.S3ApiConfiguration{}
 	if err := iama.s3ApiConfig.GetS3ApiConfiguration(s3cfg); err != nil {
-		s3err.WriteErrorResponse(w, s3err.ErrInternalError, r)
+		s3err.WriteErrorResponse(w, r, s3err.ErrInternalError)
 		return
 	}
 	s3cfgLock.RUnlock()
@ -392,7 +392,7 @@ func (iama *IamApiServer) DoActions(w http.ResponseWriter, r *http.Request) {
 		userName := values.Get("UserName")
 		response, err = iama.GetUser(s3cfg, userName)
 		if err != nil {
-			writeIamErrorResponse(w, err, "user", userName, nil)
+			writeIamErrorResponse(w, r, err, "user", userName, nil)
 			return
 		}
 		changed = false
@ -400,7 +400,7 @@ func (iama *IamApiServer) DoActions(w http.ResponseWriter, r *http.Request) {
 		userName := values.Get("UserName")
 		response, err = iama.DeleteUser(s3cfg, userName)
 		if err != nil {
-			writeIamErrorResponse(w, err, "user", userName, nil)
+			writeIamErrorResponse(w, r, err, "user", userName, nil)
 			return
 		}
 	case "CreateAccessKey":
@ -411,33 +411,33 @@ func (iama *IamApiServer) DoActions(w http.ResponseWriter, r *http.Request) {
 		response, err = iama.CreatePolicy(s3cfg, values)
 		if err != nil {
 			glog.Errorf("CreatePolicy:  %+v", err)
-			s3err.WriteErrorResponse(w, s3err.ErrInvalidRequest, r)
+			s3err.WriteErrorResponse(w, r, s3err.ErrInvalidRequest)
 			return
 		}
 	case "PutUserPolicy":
 		response, err = iama.PutUserPolicy(s3cfg, values)
 		if err != nil {
 			glog.Errorf("PutUserPolicy:  %+v", err)
-			s3err.WriteErrorResponse(w, s3err.ErrInvalidRequest, r)
+			s3err.WriteErrorResponse(w, r, s3err.ErrInvalidRequest)
 			return
 		}
 	case "GetUserPolicy":
 		response, err = iama.GetUserPolicy(s3cfg, values)
 		if err != nil {
-			writeIamErrorResponse(w, err, "user", values.Get("UserName"), nil)
+			writeIamErrorResponse(w, r, err, "user", values.Get("UserName"), nil)
 			return
 		}
 		changed = false
 	case "DeleteUserPolicy":
 		if response, err = iama.DeleteUserPolicy(s3cfg, values); err != nil {
-			writeIamErrorResponse(w, err, "user", values.Get("UserName"), nil)
+			writeIamErrorResponse(w, r, err, "user", values.Get("UserName"), nil)
 		}
 	default:
 		errNotImplemented := s3err.GetAPIError(s3err.ErrNotImplemented)
 		errorResponse := ErrorResponse{}
 		errorResponse.Error.Code = &errNotImplemented.Code
 		errorResponse.Error.Message = &errNotImplemented.Description
-		s3err.WriteXMLResponse(w, errNotImplemented.HTTPStatusCode, errorResponse)
+		s3err.WriteXMLResponse(w, r, errNotImplemented.HTTPStatusCode, errorResponse)
 		return
 	}
 	if changed {
@ -445,9 +445,9 @@ func (iama *IamApiServer) DoActions(w http.ResponseWriter, r *http.Request) {
 		err := iama.s3ApiConfig.PutS3ApiConfiguration(s3cfg)
 		s3cfgLock.Unlock()
 		if err != nil {
-			writeIamErrorResponse(w, fmt.Errorf(iam.ErrCodeServiceFailureException), "", "", err)
+			writeIamErrorResponse(w, r, fmt.Errorf(iam.ErrCodeServiceFailureException), "", "", err)
 			return
 		}
 	}
-	s3err.WriteXMLResponse(w, http.StatusOK, response)
+	s3err.WriteXMLResponse(w, r, http.StatusOK, response)
 }
--- a/weed/iamapi/iamapi_server.go
+++ b/weed/iamapi/iamapi_server.go
@ -49,7 +49,7 @@ var s3ApiConfigure IamS3ApiConfig
 func NewIamApiServer(router *mux.Router, option *IamServerOption) (iamApiServer *IamApiServer, err error) {
 	s3ApiConfigure = IamS3ApiConfigure{
 		option:       option,
-		masterClient: wdclient.NewMasterClient(option.GrpcDialOption, pb.AdminShellClient, "", "", option.Masters),
+		masterClient: wdclient.NewMasterClient(option.GrpcDialOption, "iam", "", "", option.Masters),
 	}
 	s3Option := s3api.S3ApiServerOption{Filer: option.Filer}
 	iamApiServer = &IamApiServer{
--- a/weed/messaging/broker/broker_grpc_server_discovery.go
+++ b/weed/messaging/broker/broker_grpc_server_discovery.go
@ -3,6 +3,7 @@ package broker
 import (
 	"context"
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/cluster"
 	"github.com/chrislusf/seaweedfs/weed/pb"
 	"time"

@ -93,14 +94,16 @@ func (broker *MessageBroker) checkFilers() {
 	for !found {
 		for _, master := range masters {
 			err := broker.withMasterClient(master, func(client master_pb.SeaweedClient) error {
-				resp, err := client.ListMasterClients(context.Background(), &master_pb.ListMasterClientsRequest{
-					ClientType: "filer",
+				resp, err := client.ListClusterNodes(context.Background(), &master_pb.ListClusterNodesRequest{
+					ClientType: cluster.FilerType,
 				})
 				if err != nil {
 					return err
 				}

-				filers = append(filers, pb.FromAddressStrings(resp.GrpcAddresses)...)
+				for _, clusterNode := range resp.ClusterNodes {
+					filers = append(filers, pb.ServerAddress(clusterNode.Address))
+				}

 				return nil
 			})
--- a/weed/pb/filer.proto
+++ b/weed/pb/filer.proto
@ -69,7 +69,7 @@ service SeaweedFiler {
    rpc KvPut (KvPutRequest) returns (KvPutResponse) {
    }

-    rpc DownloadToLocal (DownloadToLocalRequest) returns (DownloadToLocalResponse) {
+    rpc CacheRemoteObjectToLocalCluster (CacheRemoteObjectToLocalClusterRequest) returns (CacheRemoteObjectToLocalClusterResponse) {
    }
 }

@ -403,10 +403,10 @@ message FilerConf {
 /////////////////////////
 // Remote Storage related
 /////////////////////////
-message DownloadToLocalRequest {
+message CacheRemoteObjectToLocalClusterRequest {
    string directory = 1;
    string name = 2;
 }
-message DownloadToLocalResponse {
+message CacheRemoteObjectToLocalClusterResponse {
    Entry entry = 1;
 }
--- a/weed/pb/filer_pb/filer.pb.go
+++ b/weed/pb/filer_pb/filer.pb.go
@ -3334,7 +3334,7 @@ func (x *FilerConf) GetLocations() []*FilerConf_PathConf {
 /////////////////////////
 // Remote Storage related
 /////////////////////////
-type DownloadToLocalRequest struct {
+type CacheRemoteObjectToLocalClusterRequest struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
@ -3343,8 +3343,8 @@ type DownloadToLocalRequest struct {
 	Name      string `protobuf:"bytes,2,opt,name=name,proto3" json:"name,omitempty"`
 }

-func (x *DownloadToLocalRequest) Reset() {
-	*x = DownloadToLocalRequest{}
+func (x *CacheRemoteObjectToLocalClusterRequest) Reset() {
+	*x = CacheRemoteObjectToLocalClusterRequest{}
 	if protoimpl.UnsafeEnabled {
 		mi := &file_filer_proto_msgTypes[51]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
@ -3352,13 +3352,13 @@ func (x *DownloadToLocalRequest) Reset() {
 	}
 }

-func (x *DownloadToLocalRequest) String() string {
+func (x *CacheRemoteObjectToLocalClusterRequest) String() string {
 	return protoimpl.X.MessageStringOf(x)
 }

-func (*DownloadToLocalRequest) ProtoMessage() {}
+func (*CacheRemoteObjectToLocalClusterRequest) ProtoMessage() {}

-func (x *DownloadToLocalRequest) ProtoReflect() protoreflect.Message {
+func (x *CacheRemoteObjectToLocalClusterRequest) ProtoReflect() protoreflect.Message {
 	mi := &file_filer_proto_msgTypes[51]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
@ -3370,26 +3370,26 @@ func (x *DownloadToLocalRequest) ProtoReflect() protoreflect.Message {
 	return mi.MessageOf(x)
 }

-// Deprecated: Use DownloadToLocalRequest.ProtoReflect.Descriptor instead.
-func (*DownloadToLocalRequest) Descriptor() ([]byte, []int) {
+// Deprecated: Use CacheRemoteObjectToLocalClusterRequest.ProtoReflect.Descriptor instead.
+func (*CacheRemoteObjectToLocalClusterRequest) Descriptor() ([]byte, []int) {
 	return file_filer_proto_rawDescGZIP(), []int{51}
 }

-func (x *DownloadToLocalRequest) GetDirectory() string {
+func (x *CacheRemoteObjectToLocalClusterRequest) GetDirectory() string {
 	if x != nil {
 		return x.Directory
 	}
 	return ""
 }

-func (x *DownloadToLocalRequest) GetName() string {
+func (x *CacheRemoteObjectToLocalClusterRequest) GetName() string {
 	if x != nil {
 		return x.Name
 	}
 	return ""
 }

-type DownloadToLocalResponse struct {
+type CacheRemoteObjectToLocalClusterResponse struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
@ -3397,8 +3397,8 @@ type DownloadToLocalResponse struct {
 	Entry *Entry `protobuf:"bytes,1,opt,name=entry,proto3" json:"entry,omitempty"`
 }

-func (x *DownloadToLocalResponse) Reset() {
-	*x = DownloadToLocalResponse{}
+func (x *CacheRemoteObjectToLocalClusterResponse) Reset() {
+	*x = CacheRemoteObjectToLocalClusterResponse{}
 	if protoimpl.UnsafeEnabled {
 		mi := &file_filer_proto_msgTypes[52]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
@ -3406,13 +3406,13 @@ func (x *DownloadToLocalResponse) Reset() {
 	}
 }

-func (x *DownloadToLocalResponse) String() string {
+func (x *CacheRemoteObjectToLocalClusterResponse) String() string {
 	return protoimpl.X.MessageStringOf(x)
 }

-func (*DownloadToLocalResponse) ProtoMessage() {}
+func (*CacheRemoteObjectToLocalClusterResponse) ProtoMessage() {}

-func (x *DownloadToLocalResponse) ProtoReflect() protoreflect.Message {
+func (x *CacheRemoteObjectToLocalClusterResponse) ProtoReflect() protoreflect.Message {
 	mi := &file_filer_proto_msgTypes[52]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
@ -3424,12 +3424,12 @@ func (x *DownloadToLocalResponse) ProtoReflect() protoreflect.Message {
 	return mi.MessageOf(x)
 }

-// Deprecated: Use DownloadToLocalResponse.ProtoReflect.Descriptor instead.
-func (*DownloadToLocalResponse) Descriptor() ([]byte, []int) {
+// Deprecated: Use CacheRemoteObjectToLocalClusterResponse.ProtoReflect.Descriptor instead.
+func (*CacheRemoteObjectToLocalClusterResponse) Descriptor() ([]byte, []int) {
 	return file_filer_proto_rawDescGZIP(), []int{52}
 }

-func (x *DownloadToLocalResponse) GetEntry() *Entry {
+func (x *CacheRemoteObjectToLocalClusterResponse) GetEntry() *Entry {
 	if x != nil {
 		return x.Entry
 	}
@ -4042,16 +4042,18 @@ var file_filer_proto_rawDesc = []byte{
 	0x68, 0x5f, 0x63, 0x6f, 0x75, 0x6e, 0x74, 0x18, 0x07, 0x20, 0x01, 0x28, 0x0d, 0x52, 0x11, 0x76,
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@ -4159,18 +4161,21 @@ var file_filer_proto_rawDesc = []byte{
 	0x12, 0x3a, 0x0a, 0x05, 0x4b, 0x76, 0x50, 0x75, 0x74, 0x12, 0x16, 0x2e, 0x66, 0x69, 0x6c, 0x65,
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 }

 var (
@ -4187,59 +4192,59 @@ func file_filer_proto_rawDescGZIP() []byte {

 var file_filer_proto_msgTypes = make([]protoimpl.MessageInfo, 57)
 var file_filer_proto_goTypes = []interface{}{
-	(*LookupDirectoryEntryRequest)(nil),   // 0: filer_pb.LookupDirectoryEntryRequest
-	(*LookupDirectoryEntryResponse)(nil),  // 1: filer_pb.LookupDirectoryEntryResponse
-	(*ListEntriesRequest)(nil),            // 2: filer_pb.ListEntriesRequest
-	(*ListEntriesResponse)(nil),           // 3: filer_pb.ListEntriesResponse
-	(*RemoteEntry)(nil),                   // 4: filer_pb.RemoteEntry
-	(*Entry)(nil),                         // 5: filer_pb.Entry
-	(*FullEntry)(nil),                     // 6: filer_pb.FullEntry
-	(*EventNotification)(nil),             // 7: filer_pb.EventNotification
-	(*FileChunk)(nil),                     // 8: filer_pb.FileChunk
-	(*FileChunkManifest)(nil),             // 9: filer_pb.FileChunkManifest
-	(*FileId)(nil),                        // 10: filer_pb.FileId
-	(*FuseAttributes)(nil),                // 11: filer_pb.FuseAttributes
-	(*CreateEntryRequest)(nil),            // 12: filer_pb.CreateEntryRequest
-	(*CreateEntryResponse)(nil),           // 13: filer_pb.CreateEntryResponse
-	(*UpdateEntryRequest)(nil),            // 14: filer_pb.UpdateEntryRequest
-	(*UpdateEntryResponse)(nil),           // 15: filer_pb.UpdateEntryResponse
-	(*AppendToEntryRequest)(nil),          // 16: filer_pb.AppendToEntryRequest
-	(*AppendToEntryResponse)(nil),         // 17: filer_pb.AppendToEntryResponse
-	(*DeleteEntryRequest)(nil),            // 18: filer_pb.DeleteEntryRequest
-	(*DeleteEntryResponse)(nil),           // 19: filer_pb.DeleteEntryResponse
-	(*AtomicRenameEntryRequest)(nil),      // 20: filer_pb.AtomicRenameEntryRequest
-	(*AtomicRenameEntryResponse)(nil),     // 21: filer_pb.AtomicRenameEntryResponse
-	(*StreamRenameEntryRequest)(nil),      // 22: filer_pb.StreamRenameEntryRequest
-	(*StreamRenameEntryResponse)(nil),     // 23: filer_pb.StreamRenameEntryResponse
-	(*AssignVolumeRequest)(nil),           // 24: filer_pb.AssignVolumeRequest
-	(*AssignVolumeResponse)(nil),          // 25: filer_pb.AssignVolumeResponse
-	(*LookupVolumeRequest)(nil),           // 26: filer_pb.LookupVolumeRequest
-	(*Locations)(nil),                     // 27: filer_pb.Locations
-	(*Location)(nil),                      // 28: filer_pb.Location
-	(*LookupVolumeResponse)(nil),          // 29: filer_pb.LookupVolumeResponse
-	(*Collection)(nil),                    // 30: filer_pb.Collection
-	(*CollectionListRequest)(nil),         // 31: filer_pb.CollectionListRequest
-	(*CollectionListResponse)(nil),        // 32: filer_pb.CollectionListResponse
-	(*DeleteCollectionRequest)(nil),       // 33: filer_pb.DeleteCollectionRequest
-	(*DeleteCollectionResponse)(nil),      // 34: filer_pb.DeleteCollectionResponse
-	(*StatisticsRequest)(nil),             // 35: filer_pb.StatisticsRequest
-	(*StatisticsResponse)(nil),            // 36: filer_pb.StatisticsResponse
-	(*GetFilerConfigurationRequest)(nil),  // 37: filer_pb.GetFilerConfigurationRequest
-	(*GetFilerConfigurationResponse)(nil), // 38: filer_pb.GetFilerConfigurationResponse
-	(*SubscribeMetadataRequest)(nil),      // 39: filer_pb.SubscribeMetadataRequest
-	(*SubscribeMetadataResponse)(nil),     // 40: filer_pb.SubscribeMetadataResponse
-	(*LogEntry)(nil),                      // 41: filer_pb.LogEntry
-	(*KeepConnectedRequest)(nil),          // 42: filer_pb.KeepConnectedRequest
-	(*KeepConnectedResponse)(nil),         // 43: filer_pb.KeepConnectedResponse
-	(*LocateBrokerRequest)(nil),           // 44: filer_pb.LocateBrokerRequest
-	(*LocateBrokerResponse)(nil),          // 45: filer_pb.LocateBrokerResponse
-	(*KvGetRequest)(nil),                  // 46: filer_pb.KvGetRequest
-	(*KvGetResponse)(nil),                 // 47: filer_pb.KvGetResponse
-	(*KvPutRequest)(nil),                  // 48: filer_pb.KvPutRequest
-	(*KvPutResponse)(nil),                 // 49: filer_pb.KvPutResponse
-	(*FilerConf)(nil),                     // 50: filer_pb.FilerConf
-	(*DownloadToLocalRequest)(nil),        // 51: filer_pb.DownloadToLocalRequest
-	(*DownloadToLocalResponse)(nil),       // 52: filer_pb.DownloadToLocalResponse
+	(*LookupDirectoryEntryRequest)(nil),             // 0: filer_pb.LookupDirectoryEntryRequest
+	(*LookupDirectoryEntryResponse)(nil),            // 1: filer_pb.LookupDirectoryEntryResponse
+	(*ListEntriesRequest)(nil),                      // 2: filer_pb.ListEntriesRequest
+	(*ListEntriesResponse)(nil),                     // 3: filer_pb.ListEntriesResponse
+	(*RemoteEntry)(nil),                             // 4: filer_pb.RemoteEntry
+	(*Entry)(nil),                                   // 5: filer_pb.Entry
+	(*FullEntry)(nil),                               // 6: filer_pb.FullEntry
+	(*EventNotification)(nil),                       // 7: filer_pb.EventNotification
+	(*FileChunk)(nil),                               // 8: filer_pb.FileChunk
+	(*FileChunkManifest)(nil),                       // 9: filer_pb.FileChunkManifest
+	(*FileId)(nil),                                  // 10: filer_pb.FileId
+	(*FuseAttributes)(nil),                          // 11: filer_pb.FuseAttributes
+	(*CreateEntryRequest)(nil),                      // 12: filer_pb.CreateEntryRequest
+	(*CreateEntryResponse)(nil),                     // 13: filer_pb.CreateEntryResponse
+	(*UpdateEntryRequest)(nil),                      // 14: filer_pb.UpdateEntryRequest
+	(*UpdateEntryResponse)(nil),                     // 15: filer_pb.UpdateEntryResponse
+	(*AppendToEntryRequest)(nil),                    // 16: filer_pb.AppendToEntryRequest
+	(*AppendToEntryResponse)(nil),                   // 17: filer_pb.AppendToEntryResponse
+	(*DeleteEntryRequest)(nil),                      // 18: filer_pb.DeleteEntryRequest
+	(*DeleteEntryResponse)(nil),                     // 19: filer_pb.DeleteEntryResponse
+	(*AtomicRenameEntryRequest)(nil),                // 20: filer_pb.AtomicRenameEntryRequest
+	(*AtomicRenameEntryResponse)(nil),               // 21: filer_pb.AtomicRenameEntryResponse
+	(*StreamRenameEntryRequest)(nil),                // 22: filer_pb.StreamRenameEntryRequest
+	(*StreamRenameEntryResponse)(nil),               // 23: filer_pb.StreamRenameEntryResponse
+	(*AssignVolumeRequest)(nil),                     // 24: filer_pb.AssignVolumeRequest
+	(*AssignVolumeResponse)(nil),                    // 25: filer_pb.AssignVolumeResponse
+	(*LookupVolumeRequest)(nil),                     // 26: filer_pb.LookupVolumeRequest
+	(*Locations)(nil),                               // 27: filer_pb.Locations
+	(*Location)(nil),                                // 28: filer_pb.Location
+	(*LookupVolumeResponse)(nil),                    // 29: filer_pb.LookupVolumeResponse
+	(*Collection)(nil),                              // 30: filer_pb.Collection
+	(*CollectionListRequest)(nil),                   // 31: filer_pb.CollectionListRequest
+	(*CollectionListResponse)(nil),                  // 32: filer_pb.CollectionListResponse
+	(*DeleteCollectionRequest)(nil),                 // 33: filer_pb.DeleteCollectionRequest
+	(*DeleteCollectionResponse)(nil),                // 34: filer_pb.DeleteCollectionResponse
+	(*StatisticsRequest)(nil),                       // 35: filer_pb.StatisticsRequest
+	(*StatisticsResponse)(nil),                      // 36: filer_pb.StatisticsResponse
+	(*GetFilerConfigurationRequest)(nil),            // 37: filer_pb.GetFilerConfigurationRequest
+	(*GetFilerConfigurationResponse)(nil),           // 38: filer_pb.GetFilerConfigurationResponse
+	(*SubscribeMetadataRequest)(nil),                // 39: filer_pb.SubscribeMetadataRequest
+	(*SubscribeMetadataResponse)(nil),               // 40: filer_pb.SubscribeMetadataResponse
+	(*LogEntry)(nil),                                // 41: filer_pb.LogEntry
+	(*KeepConnectedRequest)(nil),                    // 42: filer_pb.KeepConnectedRequest
+	(*KeepConnectedResponse)(nil),                   // 43: filer_pb.KeepConnectedResponse
+	(*LocateBrokerRequest)(nil),                     // 44: filer_pb.LocateBrokerRequest
+	(*LocateBrokerResponse)(nil),                    // 45: filer_pb.LocateBrokerResponse
+	(*KvGetRequest)(nil),                            // 46: filer_pb.KvGetRequest
+	(*KvGetResponse)(nil),                           // 47: filer_pb.KvGetResponse
+	(*KvPutRequest)(nil),                            // 48: filer_pb.KvPutRequest
+	(*KvPutResponse)(nil),                           // 49: filer_pb.KvPutResponse
+	(*FilerConf)(nil),                               // 50: filer_pb.FilerConf
+	(*CacheRemoteObjectToLocalClusterRequest)(nil),  // 51: filer_pb.CacheRemoteObjectToLocalClusterRequest
+	(*CacheRemoteObjectToLocalClusterResponse)(nil), // 52: filer_pb.CacheRemoteObjectToLocalClusterResponse
 	nil,                                   // 53: filer_pb.Entry.ExtendedEntry
 	nil,                                   // 54: filer_pb.LookupVolumeResponse.LocationsMapEntry
 	(*LocateBrokerResponse_Resource)(nil), // 55: filer_pb.LocateBrokerResponse.Resource
@ -4269,7 +4274,7 @@ var file_filer_proto_depIdxs = []int32{
 	7,  // 20: filer_pb.SubscribeMetadataResponse.event_notification:type_name -> filer_pb.EventNotification
 	55, // 21: filer_pb.LocateBrokerResponse.resources:type_name -> filer_pb.LocateBrokerResponse.Resource
 	56, // 22: filer_pb.FilerConf.locations:type_name -> filer_pb.FilerConf.PathConf
-	5,  // 23: filer_pb.DownloadToLocalResponse.entry:type_name -> filer_pb.Entry
+	5,  // 23: filer_pb.CacheRemoteObjectToLocalClusterResponse.entry:type_name -> filer_pb.Entry
 	27, // 24: filer_pb.LookupVolumeResponse.LocationsMapEntry.value:type_name -> filer_pb.Locations
 	0,  // 25: filer_pb.SeaweedFiler.LookupDirectoryEntry:input_type -> filer_pb.LookupDirectoryEntryRequest
 	2,  // 26: filer_pb.SeaweedFiler.ListEntries:input_type -> filer_pb.ListEntriesRequest
@ -4291,7 +4296,7 @@ var file_filer_proto_depIdxs = []int32{
 	44, // 42: filer_pb.SeaweedFiler.LocateBroker:input_type -> filer_pb.LocateBrokerRequest
 	46, // 43: filer_pb.SeaweedFiler.KvGet:input_type -> filer_pb.KvGetRequest
 	48, // 44: filer_pb.SeaweedFiler.KvPut:input_type -> filer_pb.KvPutRequest
-	51, // 45: filer_pb.SeaweedFiler.DownloadToLocal:input_type -> filer_pb.DownloadToLocalRequest
+	51, // 45: filer_pb.SeaweedFiler.CacheRemoteObjectToLocalCluster:input_type -> filer_pb.CacheRemoteObjectToLocalClusterRequest
 	1,  // 46: filer_pb.SeaweedFiler.LookupDirectoryEntry:output_type -> filer_pb.LookupDirectoryEntryResponse
 	3,  // 47: filer_pb.SeaweedFiler.ListEntries:output_type -> filer_pb.ListEntriesResponse
 	13, // 48: filer_pb.SeaweedFiler.CreateEntry:output_type -> filer_pb.CreateEntryResponse
@ -4312,7 +4317,7 @@ var file_filer_proto_depIdxs = []int32{
 	45, // 63: filer_pb.SeaweedFiler.LocateBroker:output_type -> filer_pb.LocateBrokerResponse
 	47, // 64: filer_pb.SeaweedFiler.KvGet:output_type -> filer_pb.KvGetResponse
 	49, // 65: filer_pb.SeaweedFiler.KvPut:output_type -> filer_pb.KvPutResponse
-	52, // 66: filer_pb.SeaweedFiler.DownloadToLocal:output_type -> filer_pb.DownloadToLocalResponse
+	52, // 66: filer_pb.SeaweedFiler.CacheRemoteObjectToLocalCluster:output_type -> filer_pb.CacheRemoteObjectToLocalClusterResponse
 	46, // [46:67] is the sub-list for method output_type
 	25, // [25:46] is the sub-list for method input_type
 	25, // [25:25] is the sub-list for extension type_name
@ -4939,7 +4944,7 @@ func file_filer_proto_init() {
 			}
 		}
 		file_filer_proto_msgTypes[51].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*DownloadToLocalRequest); i {
+			switch v := v.(*CacheRemoteObjectToLocalClusterRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@ -4951,7 +4956,7 @@ func file_filer_proto_init() {
 			}
 		}
 		file_filer_proto_msgTypes[52].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*DownloadToLocalResponse); i {
+			switch v := v.(*CacheRemoteObjectToLocalClusterResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@ -5039,7 +5044,7 @@ type SeaweedFilerClient interface {
 	LocateBroker(ctx context.Context, in *LocateBrokerRequest, opts ...grpc.CallOption) (*LocateBrokerResponse, error)
 	KvGet(ctx context.Context, in *KvGetRequest, opts ...grpc.CallOption) (*KvGetResponse, error)
 	KvPut(ctx context.Context, in *KvPutRequest, opts ...grpc.CallOption) (*KvPutResponse, error)
-	DownloadToLocal(ctx context.Context, in *DownloadToLocalRequest, opts ...grpc.CallOption) (*DownloadToLocalResponse, error)
+	CacheRemoteObjectToLocalCluster(ctx context.Context, in *CacheRemoteObjectToLocalClusterRequest, opts ...grpc.CallOption) (*CacheRemoteObjectToLocalClusterResponse, error)
 }

 type seaweedFilerClient struct {
@ -5344,9 +5349,9 @@ func (c *seaweedFilerClient) KvPut(ctx context.Context, in *KvPutRequest, opts .
 	return out, nil
 }

-func (c *seaweedFilerClient) DownloadToLocal(ctx context.Context, in *DownloadToLocalRequest, opts ...grpc.CallOption) (*DownloadToLocalResponse, error) {
-	out := new(DownloadToLocalResponse)
-	err := c.cc.Invoke(ctx, "/filer_pb.SeaweedFiler/DownloadToLocal", in, out, opts...)
+func (c *seaweedFilerClient) CacheRemoteObjectToLocalCluster(ctx context.Context, in *CacheRemoteObjectToLocalClusterRequest, opts ...grpc.CallOption) (*CacheRemoteObjectToLocalClusterResponse, error) {
+	out := new(CacheRemoteObjectToLocalClusterResponse)
+	err := c.cc.Invoke(ctx, "/filer_pb.SeaweedFiler/CacheRemoteObjectToLocalCluster", in, out, opts...)
 	if err != nil {
 		return nil, err
 	}
@ -5375,7 +5380,7 @@ type SeaweedFilerServer interface {
 	LocateBroker(context.Context, *LocateBrokerRequest) (*LocateBrokerResponse, error)
 	KvGet(context.Context, *KvGetRequest) (*KvGetResponse, error)
 	KvPut(context.Context, *KvPutRequest) (*KvPutResponse, error)
-	DownloadToLocal(context.Context, *DownloadToLocalRequest) (*DownloadToLocalResponse, error)
+	CacheRemoteObjectToLocalCluster(context.Context, *CacheRemoteObjectToLocalClusterRequest) (*CacheRemoteObjectToLocalClusterResponse, error)
 }

 // UnimplementedSeaweedFilerServer can be embedded to have forward compatible implementations.
@ -5442,8 +5447,8 @@ func (*UnimplementedSeaweedFilerServer) KvGet(context.Context, *KvGetRequest) (*
 func (*UnimplementedSeaweedFilerServer) KvPut(context.Context, *KvPutRequest) (*KvPutResponse, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method KvPut not implemented")
 }
-func (*UnimplementedSeaweedFilerServer) DownloadToLocal(context.Context, *DownloadToLocalRequest) (*DownloadToLocalResponse, error) {
-	return nil, status.Errorf(codes.Unimplemented, "method DownloadToLocal not implemented")
+func (*UnimplementedSeaweedFilerServer) CacheRemoteObjectToLocalCluster(context.Context, *CacheRemoteObjectToLocalClusterRequest) (*CacheRemoteObjectToLocalClusterResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method CacheRemoteObjectToLocalCluster not implemented")
 }

 func RegisterSeaweedFilerServer(s *grpc.Server, srv SeaweedFilerServer) {
@ -5830,20 +5835,20 @@ func _SeaweedFiler_KvPut_Handler(srv interface{}, ctx context.Context, dec func(
 	return interceptor(ctx, in, info, handler)
 }

-func _SeaweedFiler_DownloadToLocal_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
-	in := new(DownloadToLocalRequest)
+func _SeaweedFiler_CacheRemoteObjectToLocalCluster_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(CacheRemoteObjectToLocalClusterRequest)
 	if err := dec(in); err != nil {
 		return nil, err
 	}
 	if interceptor == nil {
-		return srv.(SeaweedFilerServer).DownloadToLocal(ctx, in)
+		return srv.(SeaweedFilerServer).CacheRemoteObjectToLocalCluster(ctx, in)
 	}
 	info := &grpc.UnaryServerInfo{
 		Server:     srv,
-		FullMethod: "/filer_pb.SeaweedFiler/DownloadToLocal",
+		FullMethod: "/filer_pb.SeaweedFiler/CacheRemoteObjectToLocalCluster",
 	}
 	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
-		return srv.(SeaweedFilerServer).DownloadToLocal(ctx, req.(*DownloadToLocalRequest))
+		return srv.(SeaweedFilerServer).CacheRemoteObjectToLocalCluster(ctx, req.(*CacheRemoteObjectToLocalClusterRequest))
 	}
 	return interceptor(ctx, in, info, handler)
 }
@ -5913,8 +5918,8 @@ var _SeaweedFiler_serviceDesc = grpc.ServiceDesc{
 			Handler:    _SeaweedFiler_KvPut_Handler,
 		},
 		{
-			MethodName: "DownloadToLocal",
-			Handler:    _SeaweedFiler_DownloadToLocal_Handler,
+			MethodName: "CacheRemoteObjectToLocalCluster",
+			Handler:    _SeaweedFiler_CacheRemoteObjectToLocalCluster_Handler,
 		},
 	},
 	Streams: []grpc.StreamDesc{
--- a/weed/pb/master.proto
+++ b/weed/pb/master.proto
@ -7,209 +7,222 @@ option go_package = "github.com/chrislusf/seaweedfs/weed/pb/master_pb";
 //////////////////////////////////////////////////

 service Seaweed {
-    rpc SendHeartbeat (stream Heartbeat) returns (stream HeartbeatResponse) {
-    }
-    rpc KeepConnected (stream KeepConnectedRequest) returns (stream VolumeLocation) {
-    }
-    rpc LookupVolume (LookupVolumeRequest) returns (LookupVolumeResponse) {
-    }
-    rpc Assign (AssignRequest) returns (AssignResponse) {
-    }
-    rpc Statistics (StatisticsRequest) returns (StatisticsResponse) {
-    }
-    rpc CollectionList (CollectionListRequest) returns (CollectionListResponse) {
-    }
-    rpc CollectionDelete (CollectionDeleteRequest) returns (CollectionDeleteResponse) {
-    }
-    rpc VolumeList (VolumeListRequest) returns (VolumeListResponse) {
-    }
-    rpc LookupEcVolume (LookupEcVolumeRequest) returns (LookupEcVolumeResponse) {
-    }
-    rpc VacuumVolume (VacuumVolumeRequest) returns (VacuumVolumeResponse) {
-    }
-    rpc GetMasterConfiguration (GetMasterConfigurationRequest) returns (GetMasterConfigurationResponse) {
-    }
-    rpc ListMasterClients (ListMasterClientsRequest) returns (ListMasterClientsResponse) {
-    }
-    rpc LeaseAdminToken (LeaseAdminTokenRequest) returns (LeaseAdminTokenResponse) {
-    }
-    rpc ReleaseAdminToken (ReleaseAdminTokenRequest) returns (ReleaseAdminTokenResponse) {
-    }
+  rpc SendHeartbeat (stream Heartbeat) returns (stream HeartbeatResponse) {
+  }
+  rpc KeepConnected (stream KeepConnectedRequest) returns (stream KeepConnectedResponse) {
+  }
+  rpc LookupVolume (LookupVolumeRequest) returns (LookupVolumeResponse) {
+  }
+  rpc Assign (AssignRequest) returns (AssignResponse) {
+  }
+  rpc Statistics (StatisticsRequest) returns (StatisticsResponse) {
+  }
+  rpc CollectionList (CollectionListRequest) returns (CollectionListResponse) {
+  }
+  rpc CollectionDelete (CollectionDeleteRequest) returns (CollectionDeleteResponse) {
+  }
+  rpc VolumeList (VolumeListRequest) returns (VolumeListResponse) {
+  }
+  rpc LookupEcVolume (LookupEcVolumeRequest) returns (LookupEcVolumeResponse) {
+  }
+  rpc VacuumVolume (VacuumVolumeRequest) returns (VacuumVolumeResponse) {
+  }
+  rpc GetMasterConfiguration (GetMasterConfigurationRequest) returns (GetMasterConfigurationResponse) {
+  }
+  rpc ListClusterNodes (ListClusterNodesRequest) returns (ListClusterNodesResponse) {
+  }
+  rpc LeaseAdminToken (LeaseAdminTokenRequest) returns (LeaseAdminTokenResponse) {
+  }
+  rpc ReleaseAdminToken (ReleaseAdminTokenRequest) returns (ReleaseAdminTokenResponse) {
+  }

 }

 //////////////////////////////////////////////////

 message Heartbeat {
-    string ip = 1;
-    uint32 port = 2;
-    string public_url = 3;
-    uint64 max_file_key = 5;
-    string data_center = 6;
-    string rack = 7;
-    uint32 admin_port = 8;
-    repeated VolumeInformationMessage volumes = 9;
-    // delta volumes
-    repeated VolumeShortInformationMessage new_volumes = 10;
-    repeated VolumeShortInformationMessage deleted_volumes = 11;
-    bool has_no_volumes = 12;
+  string ip = 1;
+  uint32 port = 2;
+  string public_url = 3;
+  uint64 max_file_key = 5;
+  string data_center = 6;
+  string rack = 7;
+  uint32 admin_port = 8;
+  repeated VolumeInformationMessage volumes = 9;
+  // delta volumes
+  repeated VolumeShortInformationMessage new_volumes = 10;
+  repeated VolumeShortInformationMessage deleted_volumes = 11;
+  bool has_no_volumes = 12;

-    // erasure coding
-    repeated VolumeEcShardInformationMessage ec_shards = 16;
-    // delta erasure coding shards
-    repeated VolumeEcShardInformationMessage new_ec_shards = 17;
-    repeated VolumeEcShardInformationMessage deleted_ec_shards = 18;
-    bool has_no_ec_shards = 19;
+  // erasure coding
+  repeated VolumeEcShardInformationMessage ec_shards = 16;
+  // delta erasure coding shards
+  repeated VolumeEcShardInformationMessage new_ec_shards = 17;
+  repeated VolumeEcShardInformationMessage deleted_ec_shards = 18;
+  bool has_no_ec_shards = 19;

-    map<string, uint32> max_volume_counts = 4;
-    uint32 grpc_port = 20;
+  map<string, uint32> max_volume_counts = 4;
+  uint32 grpc_port = 20;

 }

 message HeartbeatResponse {
-    uint64 volume_size_limit = 1;
-    string leader = 2;
-    string metrics_address = 3;
-    uint32 metrics_interval_seconds = 4;
-    repeated StorageBackend storage_backends = 5;
+  uint64 volume_size_limit = 1;
+  string leader = 2;
+  string metrics_address = 3;
+  uint32 metrics_interval_seconds = 4;
+  repeated StorageBackend storage_backends = 5;
 }

 message VolumeInformationMessage {
-    uint32 id = 1;
-    uint64 size = 2;
-    string collection = 3;
-    uint64 file_count = 4;
-    uint64 delete_count = 5;
-    uint64 deleted_byte_count = 6;
-    bool read_only = 7;
-    uint32 replica_placement = 8;
-    uint32 version = 9;
-    uint32 ttl = 10;
-    uint32 compact_revision = 11;
-    int64 modified_at_second = 12;
-    string remote_storage_name = 13;
-    string remote_storage_key = 14;
-    string disk_type = 15;
+  uint32 id = 1;
+  uint64 size = 2;
+  string collection = 3;
+  uint64 file_count = 4;
+  uint64 delete_count = 5;
+  uint64 deleted_byte_count = 6;
+  bool read_only = 7;
+  uint32 replica_placement = 8;
+  uint32 version = 9;
+  uint32 ttl = 10;
+  uint32 compact_revision = 11;
+  int64 modified_at_second = 12;
+  string remote_storage_name = 13;
+  string remote_storage_key = 14;
+  string disk_type = 15;
 }

 message VolumeShortInformationMessage {
-    uint32 id = 1;
-    string collection = 3;
-    uint32 replica_placement = 8;
-    uint32 version = 9;
-    uint32 ttl = 10;
-    string disk_type = 15;
+  uint32 id = 1;
+  string collection = 3;
+  uint32 replica_placement = 8;
+  uint32 version = 9;
+  uint32 ttl = 10;
+  string disk_type = 15;
 }

 message VolumeEcShardInformationMessage {
-    uint32 id = 1;
-    string collection = 2;
-    uint32 ec_index_bits = 3;
-    string disk_type = 4;
+  uint32 id = 1;
+  string collection = 2;
+  uint32 ec_index_bits = 3;
+  string disk_type = 4;
 }

 message StorageBackend {
-    string type = 1;
-    string id = 2;
-    map<string, string> properties = 3;
+  string type = 1;
+  string id = 2;
+  map<string, string> properties = 3;
 }

 message Empty {
 }

 message SuperBlockExtra {
-    message ErasureCoding {
-        uint32 data = 1;
-        uint32 parity = 2;
-        repeated uint32 volume_ids = 3;
-    }
-    ErasureCoding erasure_coding = 1;
+  message ErasureCoding {
+    uint32 data = 1;
+    uint32 parity = 2;
+    repeated uint32 volume_ids = 3;
+  }
+  ErasureCoding erasure_coding = 1;
 }

 message KeepConnectedRequest {
-    string name = 1;
-    string client_address = 3;
+  string client_type = 1;
+  string client_address = 3;
+  string version = 4;
 }

 message VolumeLocation {
-    string url = 1;
-    string public_url = 2;
-    repeated uint32 new_vids = 3;
-    repeated uint32 deleted_vids = 4;
-    string leader = 5; // optional when leader is not itself
-    string data_center = 6; // optional when DataCenter is in use
-    uint32 grpc_port = 7;
+  string url = 1;
+  string public_url = 2;
+  repeated uint32 new_vids = 3;
+  repeated uint32 deleted_vids = 4;
+  string leader = 5; // optional when leader is not itself
+  string data_center = 6; // optional when DataCenter is in use
+  uint32 grpc_port = 7;
+}
+
+message ClusterNodeUpdate {
+  string node_type = 1;
+  string address = 2;
+  bool is_leader = 3;
+  bool is_add = 4;
+}
+
+message KeepConnectedResponse {
+  VolumeLocation volume_location = 1;
+  ClusterNodeUpdate cluster_node_update = 2;
 }

 message LookupVolumeRequest {
-    repeated string volume_or_file_ids = 1;
-    string collection = 2; // optional, a bit faster if provided.
+  repeated string volume_or_file_ids = 1;
+  string collection = 2; // optional, a bit faster if provided.
 }
 message LookupVolumeResponse {
-    message VolumeIdLocation {
-        string volume_or_file_id = 1;
-        repeated Location locations = 2;
-        string error = 3;
-        string auth = 4;
-    }
-    repeated VolumeIdLocation volume_id_locations = 1;
+  message VolumeIdLocation {
+    string volume_or_file_id = 1;
+    repeated Location locations = 2;
+    string error = 3;
+    string auth = 4;
+  }
+  repeated VolumeIdLocation volume_id_locations = 1;
 }

 message Location {
-    string url = 1;
-    string public_url = 2;
-    uint32 grpc_port = 3;
+  string url = 1;
+  string public_url = 2;
+  uint32 grpc_port = 3;
 }

 message AssignRequest {
-    uint64 count = 1;
-    string replication = 2;
-    string collection = 3;
-    string ttl = 4;
-    string data_center = 5;
-    string rack = 6;
-    string data_node = 7;
-    uint32 memory_map_max_size_mb = 8;
-    uint32 Writable_volume_count = 9;
-    string disk_type = 10;
+  uint64 count = 1;
+  string replication = 2;
+  string collection = 3;
+  string ttl = 4;
+  string data_center = 5;
+  string rack = 6;
+  string data_node = 7;
+  uint32 memory_map_max_size_mb = 8;
+  uint32 Writable_volume_count = 9;
+  string disk_type = 10;
 }
 message AssignResponse {
-    string fid = 1;
-    uint64 count = 4;
-    string error = 5;
-    string auth = 6;
-    repeated Location replicas = 7;
-    Location location = 8;
+  string fid = 1;
+  uint64 count = 4;
+  string error = 5;
+  string auth = 6;
+  repeated Location replicas = 7;
+  Location location = 8;
 }

 message StatisticsRequest {
-    string replication = 1;
-    string collection = 2;
-    string ttl = 3;
-    string disk_type = 4;
+  string replication = 1;
+  string collection = 2;
+  string ttl = 3;
+  string disk_type = 4;
 }
 message StatisticsResponse {
-    uint64 total_size = 4;
-    uint64 used_size = 5;
-    uint64 file_count = 6;
+  uint64 total_size = 4;
+  uint64 used_size = 5;
+  uint64 file_count = 6;
 }

 //
 // collection related
 //
 message Collection {
-    string name = 1;
+  string name = 1;
 }
 message CollectionListRequest {
-    bool include_normal_volumes = 1;
-    bool include_ec_volumes = 2;
+  bool include_normal_volumes = 1;
+  bool include_ec_volumes = 2;
 }
 message CollectionListResponse {
-    repeated Collection collections = 1;
+  repeated Collection collections = 1;
 }

 message CollectionDeleteRequest {
-    string name = 1;
+  string name = 1;
 }
 message CollectionDeleteResponse {
 }
@ -218,56 +231,56 @@ message CollectionDeleteResponse {
 // volume related
 //
 message DiskInfo {
-    string type = 1;
-    int64 volume_count = 2;
-    int64 max_volume_count = 3;
-    int64 free_volume_count = 4;
-    int64 active_volume_count = 5;
-    repeated VolumeInformationMessage volume_infos = 6;
-    repeated VolumeEcShardInformationMessage ec_shard_infos = 7;
-    int64 remote_volume_count = 8;
+  string type = 1;
+  int64 volume_count = 2;
+  int64 max_volume_count = 3;
+  int64 free_volume_count = 4;
+  int64 active_volume_count = 5;
+  repeated VolumeInformationMessage volume_infos = 6;
+  repeated VolumeEcShardInformationMessage ec_shard_infos = 7;
+  int64 remote_volume_count = 8;
 }
 message DataNodeInfo {
-    string id = 1;
-    map<string, DiskInfo> diskInfos = 2;
-    uint32 grpc_port = 3;
+  string id = 1;
+  map<string, DiskInfo> diskInfos = 2;
+  uint32 grpc_port = 3;
 }
 message RackInfo {
-    string id = 1;
-    repeated DataNodeInfo data_node_infos = 2;
-    map<string, DiskInfo> diskInfos = 3;
+  string id = 1;
+  repeated DataNodeInfo data_node_infos = 2;
+  map<string, DiskInfo> diskInfos = 3;
 }
 message DataCenterInfo {
-    string id = 1;
-    repeated RackInfo rack_infos = 2;
-    map<string, DiskInfo> diskInfos = 3;
+  string id = 1;
+  repeated RackInfo rack_infos = 2;
+  map<string, DiskInfo> diskInfos = 3;
 }
 message TopologyInfo {
-    string id = 1;
-    repeated DataCenterInfo data_center_infos = 2;
-    map<string, DiskInfo> diskInfos = 3;
+  string id = 1;
+  repeated DataCenterInfo data_center_infos = 2;
+  map<string, DiskInfo> diskInfos = 3;
 }
 message VolumeListRequest {
 }
 message VolumeListResponse {
-    TopologyInfo topology_info = 1;
-    uint64 volume_size_limit_mb = 2;
+  TopologyInfo topology_info = 1;
+  uint64 volume_size_limit_mb = 2;
 }

 message LookupEcVolumeRequest {
-    uint32 volume_id = 1;
+  uint32 volume_id = 1;
 }
 message LookupEcVolumeResponse {
-    uint32 volume_id = 1;
-    message EcShardIdLocation {
-        uint32 shard_id = 1;
-        repeated Location locations = 2;
-    }
-    repeated EcShardIdLocation shard_id_locations = 2;
+  uint32 volume_id = 1;
+  message EcShardIdLocation {
+    uint32 shard_id = 1;
+    repeated Location locations = 2;
+  }
+  repeated EcShardIdLocation shard_id_locations = 2;
 }

 message VacuumVolumeRequest {
-    float garbage_threshold = 1;
+  float garbage_threshold = 1;
 }
 message VacuumVolumeResponse {
 }
@ -275,37 +288,42 @@ message VacuumVolumeResponse {
 message GetMasterConfigurationRequest {
 }
 message GetMasterConfigurationResponse {
-    string metrics_address = 1;
-    uint32 metrics_interval_seconds = 2;
-    repeated StorageBackend storage_backends = 3;
-    string default_replication = 4;
-    string leader = 5;
-    uint32 volume_size_limit_m_b = 6;
-    bool volume_preallocate = 7;
+  string metrics_address = 1;
+  uint32 metrics_interval_seconds = 2;
+  repeated StorageBackend storage_backends = 3;
+  string default_replication = 4;
+  string leader = 5;
+  uint32 volume_size_limit_m_b = 6;
+  bool volume_preallocate = 7;
 }

-message ListMasterClientsRequest {
-    string client_type = 1;
+message ListClusterNodesRequest {
+  string client_type = 1;
 }
-message ListMasterClientsResponse {
-    repeated string grpc_addresses = 1;
+message ListClusterNodesResponse {
+  message ClusterNode {
+    string address = 1;
+    string version = 2;
+    bool is_leader = 3;
+  }
+  repeated ClusterNode cluster_nodes = 1;
 }

 message LeaseAdminTokenRequest {
-    int64 previous_token = 1;
-    int64 previous_lock_time = 2;
-    string lock_name = 3;
-    string client_name = 4;
+  int64 previous_token = 1;
+  int64 previous_lock_time = 2;
+  string lock_name = 3;
+  string client_name = 4;
 }
 message LeaseAdminTokenResponse {
-    int64 token = 1;
-    int64 lock_ts_ns = 2;
+  int64 token = 1;
+  int64 lock_ts_ns = 2;
 }

 message ReleaseAdminTokenRequest {
-    int64 previous_token = 1;
-    int64 previous_lock_time = 2;
-    string lock_name = 3;
+  int64 previous_token = 1;
+  int64 previous_lock_time = 2;
+  string lock_name = 3;
 }
 message ReleaseAdminTokenResponse {
 }
--- a/weed/pb/master_pb/master.pb.go
+++ b/weed/pb/master_pb/master.pb.go
--- a/weed/remote_storage/s3/s3_storage_client.go
+++ b/weed/remote_storage/s3/s3_storage_client.go
@ -83,6 +83,7 @@ func (s *s3RemoteStorageClient) Traverse(remote *remote_pb.RemoteStorageLocation
 	}
 	isLastPage := false
 	for !isLastPage && err == nil {
+		var localErr error
 		listErr := s.conn.ListObjectsV2Pages(listInput, func(page *s3.ListObjectsV2Output, lastPage bool) bool {
 			for _, content := range page.Contents {
 				key := *content.Key
@ -94,6 +95,7 @@ func (s *s3RemoteStorageClient) Traverse(remote *remote_pb.RemoteStorageLocation
 					RemoteETag:  *content.ETag,
 					StorageName: s.conf.Name,
 				}); err != nil {
+					localErr = err
 					return false
 				}
 			}
@ -104,6 +106,9 @@ func (s *s3RemoteStorageClient) Traverse(remote *remote_pb.RemoteStorageLocation
 		if listErr != nil {
 			err = fmt.Errorf("list %v: %v", remote, listErr)
 		}
+		if localErr != nil {
+			err = fmt.Errorf("process %v: %v", remote, localErr)
+		}
 	}
 	return
 }
--- a/weed/s3api/auth_credentials.go
+++ b/weed/s3api/auth_credentials.go
@ -5,6 +5,7 @@ import (
 	"net/http"
 	"os"
 	"strings"
+	"sync"

 	"github.com/chrislusf/seaweedfs/weed/filer"
 	"github.com/chrislusf/seaweedfs/weed/glog"
@ -23,6 +24,8 @@ type Iam interface {
 }

 type IdentityAccessManagement struct {
+	m sync.RWMutex
+
 	identities []*Identity
 	domain     string
 }
@ -131,31 +134,38 @@ func (iam *IdentityAccessManagement) loadS3ApiConfiguration(config *iam_pb.S3Api
 		}
 		identities = append(identities, t)
 	}
-
+	iam.m.Lock()
 	// atomically switch
 	iam.identities = identities
+	iam.m.Unlock()
 	return nil
 }

 func (iam *IdentityAccessManagement) isEnabled() bool {
-
+	iam.m.RLock()
+	defer iam.m.RUnlock()
 	return len(iam.identities) > 0
 }

 func (iam *IdentityAccessManagement) lookupByAccessKey(accessKey string) (identity *Identity, cred *Credential, found bool) {

+	iam.m.RLock()
+	defer iam.m.RUnlock()
 	for _, ident := range iam.identities {
 		for _, cred := range ident.Credentials {
+			// println("checking", ident.Name, cred.AccessKey)
 			if cred.AccessKey == accessKey {
 				return ident, cred, true
 			}
 		}
 	}
+	glog.V(1).Infof("could not find accessKey %s", accessKey)
 	return nil, nil, false
 }

 func (iam *IdentityAccessManagement) lookupAnonymous() (identity *Identity, found bool) {
-
+	iam.m.RLock()
+	defer iam.m.RUnlock()
 	for _, ident := range iam.identities {
 		if ident.Name == "anonymous" {
 			return ident, true
@ -177,12 +187,14 @@ func (iam *IdentityAccessManagement) Auth(f http.HandlerFunc, action Action) htt
 				r.Header.Set(xhttp.AmzIdentityId, identity.Name)
 				if identity.isAdmin() {
 					r.Header.Set(xhttp.AmzIsAdmin, "true")
+				} else if _, ok := r.Header[xhttp.AmzIsAdmin]; ok {
+					r.Header.Del(xhttp.AmzIsAdmin)
 				}
 			}
 			f(w, r)
 			return
 		}
-		s3err.WriteErrorResponse(w, errCode, r)
+		s3err.WriteErrorResponse(w, r, errCode)
 	}
 }

--- a/weed/s3api/s3api_bucket_handlers.go
+++ b/weed/s3api/s3api_bucket_handlers.go
@ -36,7 +36,7 @@ func (s3a *S3ApiServer) ListBucketsHandler(w http.ResponseWriter, r *http.Reques
 	if s3a.iam.isEnabled() {
 		identity, s3Err = s3a.iam.authUser(r)
 		if s3Err != s3err.ErrNone {
-			s3err.WriteErrorResponse(w, s3Err, r)
+			s3err.WriteErrorResponse(w, r, s3Err)
 			return
 		}
 	}
@ -46,7 +46,7 @@ func (s3a *S3ApiServer) ListBucketsHandler(w http.ResponseWriter, r *http.Reques
 	entries, _, err := s3a.list(s3a.option.BucketsPath, "", "", false, math.MaxInt32)

 	if err != nil {
-		s3err.WriteErrorResponse(w, s3err.ErrInternalError, r)
+		s3err.WriteErrorResponse(w, r, s3err.ErrInternalError)
 		return
 	}

@ -73,7 +73,7 @@ func (s3a *S3ApiServer) ListBucketsHandler(w http.ResponseWriter, r *http.Reques
 		Buckets: buckets,
 	}

-	writeSuccessResponseXML(w, response)
+	writeSuccessResponseXML(w, r, response)
 }

 func (s3a *S3ApiServer) PutBucketHandler(w http.ResponseWriter, r *http.Request) {
@ -100,17 +100,24 @@ func (s3a *S3ApiServer) PutBucketHandler(w http.ResponseWriter, r *http.Request)
 		}
 		return nil
 	}); err != nil {
-		s3err.WriteErrorResponse(w, s3err.ErrInternalError, r)
+		s3err.WriteErrorResponse(w, r, s3err.ErrInternalError)
 		return
 	}
 	if exist, err := s3a.exists(s3a.option.BucketsPath, bucket, true); err == nil && exist {
 		errCode = s3err.ErrBucketAlreadyExists
 	}
 	if errCode != s3err.ErrNone {
-		s3err.WriteErrorResponse(w, errCode, r)
+		s3err.WriteErrorResponse(w, r, errCode)
 		return
 	}

+	if s3a.iam.isEnabled() {
+		if _, errCode = s3a.iam.authRequest(r, s3_constants.ACTION_ADMIN); errCode != s3err.ErrNone {
+			s3err.WriteErrorResponse(w, r, errCode)
+			return
+		}
+	}
+
 	fn := func(entry *filer_pb.Entry) {
 		if identityId := r.Header.Get(xhttp.AmzIdentityId); identityId != "" {
 			if entry.Extended == nil {
@ -123,11 +130,11 @@ func (s3a *S3ApiServer) PutBucketHandler(w http.ResponseWriter, r *http.Request)
 	// create the folder for bucket, but lazily create actual collection
 	if err := s3a.mkdir(s3a.option.BucketsPath, bucket, fn); err != nil {
 		glog.Errorf("PutBucketHandler mkdir: %v", err)
-		s3err.WriteErrorResponse(w, s3err.ErrInternalError, r)
+		s3err.WriteErrorResponse(w, r, s3err.ErrInternalError)
 		return
 	}

-	writeSuccessResponseEmpty(w)
+	writeSuccessResponseEmpty(w, r)
 }

 func (s3a *S3ApiServer) DeleteBucketHandler(w http.ResponseWriter, r *http.Request) {
@ -136,7 +143,7 @@ func (s3a *S3ApiServer) DeleteBucketHandler(w http.ResponseWriter, r *http.Reque
 	glog.V(3).Infof("DeleteBucketHandler %s", bucket)

 	if err := s3a.checkBucket(r, bucket); err != s3err.ErrNone {
-		s3err.WriteErrorResponse(w, err, r)
+		s3err.WriteErrorResponse(w, r, err)
 		return
 	}

@ -158,11 +165,11 @@ func (s3a *S3ApiServer) DeleteBucketHandler(w http.ResponseWriter, r *http.Reque
 	err = s3a.rm(s3a.option.BucketsPath, bucket, false, true)

 	if err != nil {
-		s3err.WriteErrorResponse(w, s3err.ErrInternalError, r)
+		s3err.WriteErrorResponse(w, r, s3err.ErrInternalError)
 		return
 	}

-	s3err.WriteEmptyResponse(w, http.StatusNoContent)
+	s3err.WriteEmptyResponse(w, r, http.StatusNoContent)
 }

 func (s3a *S3ApiServer) HeadBucketHandler(w http.ResponseWriter, r *http.Request) {
@ -171,11 +178,11 @@ func (s3a *S3ApiServer) HeadBucketHandler(w http.ResponseWriter, r *http.Request
 	glog.V(3).Infof("HeadBucketHandler %s", bucket)

 	if err := s3a.checkBucket(r, bucket); err != s3err.ErrNone {
-		s3err.WriteErrorResponse(w, err, r)
+		s3err.WriteErrorResponse(w, r, err)
 		return
 	}

-	writeSuccessResponseEmpty(w)
+	writeSuccessResponseEmpty(w, r)
 }

 func (s3a *S3ApiServer) checkBucket(r *http.Request, bucket string) s3err.ErrorCode {
@ -216,7 +223,7 @@ func (s3a *S3ApiServer) GetBucketAclHandler(w http.ResponseWriter, r *http.Reque
 	glog.V(3).Infof("GetBucketAclHandler %s", bucket)

 	if err := s3a.checkBucket(r, bucket); err != s3err.ErrNone {
-		s3err.WriteErrorResponse(w, err, r)
+		s3err.WriteErrorResponse(w, r, err)
 		return
 	}

@ -245,7 +252,7 @@ func (s3a *S3ApiServer) GetBucketAclHandler(w http.ResponseWriter, r *http.Reque
 			})
 		}
 	}
-	writeSuccessResponseXML(w, response)
+	writeSuccessResponseXML(w, r, response)
 }

 // GetBucketLifecycleConfigurationHandler Get Bucket Lifecycle configuration
@ -256,18 +263,18 @@ func (s3a *S3ApiServer) GetBucketLifecycleConfigurationHandler(w http.ResponseWr
 	glog.V(3).Infof("GetBucketAclHandler %s", bucket)

 	if err := s3a.checkBucket(r, bucket); err != s3err.ErrNone {
-		s3err.WriteErrorResponse(w, err, r)
+		s3err.WriteErrorResponse(w, r, err)
 		return
 	}
 	fc, err := filer.ReadFilerConf(s3a.option.Filer, s3a.option.GrpcDialOption, nil)
 	if err != nil {
 		glog.Errorf("GetBucketLifecycleConfigurationHandler: %s", err)
-		s3err.WriteErrorResponse(w, s3err.ErrInternalError, r)
+		s3err.WriteErrorResponse(w, r, s3err.ErrInternalError)
 		return
 	}
 	ttls := fc.GetCollectionTtls(bucket)
 	if len(ttls) == 0 {
-		s3err.WriteErrorResponse(w, s3err.ErrNoSuchLifecycleConfiguration, r)
+		s3err.WriteErrorResponse(w, r, s3err.ErrNoSuchLifecycleConfiguration)
 		return
 	}
 	response := Lifecycle{}
@ -285,14 +292,14 @@ func (s3a *S3ApiServer) GetBucketLifecycleConfigurationHandler(w http.ResponseWr
 			Expiration: Expiration{Days: days, set: true},
 		})
 	}
-	writeSuccessResponseXML(w, response)
+	writeSuccessResponseXML(w, r, response)
 }

 // PutBucketLifecycleConfigurationHandler Put Bucket Lifecycle configuration
 // https://docs.aws.amazon.com/AmazonS3/latest/API/API_PutBucketLifecycleConfiguration.html
 func (s3a *S3ApiServer) PutBucketLifecycleConfigurationHandler(w http.ResponseWriter, r *http.Request) {

-	s3err.WriteErrorResponse(w, s3err.ErrNotImplemented, r)
+	s3err.WriteErrorResponse(w, r, s3err.ErrNotImplemented)

 }

@ -300,6 +307,6 @@ func (s3a *S3ApiServer) PutBucketLifecycleConfigurationHandler(w http.ResponseWr
 // https://docs.aws.amazon.com/AmazonS3/latest/API/API_DeleteBucketLifecycle.html
 func (s3a *S3ApiServer) DeleteBucketLifecycleHandler(w http.ResponseWriter, r *http.Request) {

-	s3err.WriteEmptyResponse(w, http.StatusNoContent)
+	s3err.WriteEmptyResponse(w, r, http.StatusNoContent)

 }
--- a/weed/s3api/s3api_handlers.go
+++ b/weed/s3api/s3api_handlers.go
@ -26,12 +26,12 @@ func (s3a *S3ApiServer) AdjustedUrl(location *filer_pb.Location) string {
 	return location.Url
 }

-func writeSuccessResponseXML(w http.ResponseWriter, response interface{}) {
-	s3err.WriteXMLResponse(w, http.StatusOK, response)
+func writeSuccessResponseXML(w http.ResponseWriter, r *http.Request, response interface{}) {
+	s3err.WriteXMLResponse(w, r, http.StatusOK, response)
 }

-func writeSuccessResponseEmpty(w http.ResponseWriter) {
-	s3err.WriteEmptyResponse(w, http.StatusOK)
+func writeSuccessResponseEmpty(w http.ResponseWriter, r *http.Request) {
+	s3err.WriteEmptyResponse(w, r, http.StatusOK)
 }

 func validateContentMd5(h http.Header) ([]byte, error) {
--- a/weed/s3api/s3api_object_copy_handlers.go
+++ b/weed/s3api/s3api_object_copy_handlers.go
@ -34,16 +34,16 @@ func (s3a *S3ApiServer) CopyObjectHandler(w http.ResponseWriter, r *http.Request
 		dir, name := fullPath.DirAndName()
 		entry, err := s3a.getEntry(dir, name)
 		if err != nil {
-			s3err.WriteErrorResponse(w, s3err.ErrInvalidCopySource, r)
+			s3err.WriteErrorResponse(w, r, s3err.ErrInvalidCopySource)
 			return
 		}
 		entry.Extended = weed_server.SaveAmzMetaData(r, entry.Extended, isReplace(r))
 		err = s3a.touch(dir, name, entry)
 		if err != nil {
-			s3err.WriteErrorResponse(w, s3err.ErrInvalidCopySource, r)
+			s3err.WriteErrorResponse(w, r, s3err.ErrInvalidCopySource)
 			return
 		}
-		writeSuccessResponseXML(w, CopyObjectResult{
+		writeSuccessResponseXML(w, r, CopyObjectResult{
 			ETag:         fmt.Sprintf("%x", entry.Attributes.Md5),
 			LastModified: time.Now().UTC(),
 		})
@ -52,19 +52,19 @@ func (s3a *S3ApiServer) CopyObjectHandler(w http.ResponseWriter, r *http.Request

 	// If source object is empty or bucket is empty, reply back invalid copy source.
 	if srcObject == "" || srcBucket == "" {
-		s3err.WriteErrorResponse(w, s3err.ErrInvalidCopySource, r)
+		s3err.WriteErrorResponse(w, r, s3err.ErrInvalidCopySource)
 		return
 	}
 	srcPath := util.FullPath(fmt.Sprintf("%s/%s%s", s3a.option.BucketsPath, srcBucket, srcObject))
 	dir, name := srcPath.DirAndName()
 	_, err = s3a.getEntry(dir, name)
 	if err != nil {
-		s3err.WriteErrorResponse(w, s3err.ErrInvalidCopySource, r)
+		s3err.WriteErrorResponse(w, r, s3err.ErrInvalidCopySource)
 		return
 	}

 	if srcBucket == dstBucket && srcObject == dstObject {
-		s3err.WriteErrorResponse(w, s3err.ErrInvalidCopyDest, r)
+		s3err.WriteErrorResponse(w, r, s3err.ErrInvalidCopyDest)
 		return
 	}

@ -75,7 +75,7 @@ func (s3a *S3ApiServer) CopyObjectHandler(w http.ResponseWriter, r *http.Request

 	_, _, resp, err := util.DownloadFile(srcUrl, "")
 	if err != nil {
-		s3err.WriteErrorResponse(w, s3err.ErrInvalidCopySource, r)
+		s3err.WriteErrorResponse(w, r, s3err.ErrInvalidCopySource)
 		return
 	}
 	defer util.CloseResponse(resp)
@ -84,7 +84,7 @@ func (s3a *S3ApiServer) CopyObjectHandler(w http.ResponseWriter, r *http.Request
 	etag, errCode := s3a.putToFiler(r, dstUrl, resp.Body)

 	if errCode != s3err.ErrNone {
-		s3err.WriteErrorResponse(w, errCode, r)
+		s3err.WriteErrorResponse(w, r, errCode)
 		return
 	}

@ -95,7 +95,7 @@ func (s3a *S3ApiServer) CopyObjectHandler(w http.ResponseWriter, r *http.Request
 		LastModified: time.Now().UTC(),
 	}

-	writeSuccessResponseXML(w, response)
+	writeSuccessResponseXML(w, r, response)

 }

@ -128,7 +128,7 @@ func (s3a *S3ApiServer) CopyObjectPartHandler(w http.ResponseWriter, r *http.Req
 	srcBucket, srcObject := pathToBucketAndObject(cpSrcPath)
 	// If source object is empty or bucket is empty, reply back invalid copy source.
 	if srcObject == "" || srcBucket == "" {
-		s3err.WriteErrorResponse(w, s3err.ErrInvalidCopySource, r)
+		s3err.WriteErrorResponse(w, r, s3err.ErrInvalidCopySource)
 		return
 	}

@ -137,7 +137,7 @@ func (s3a *S3ApiServer) CopyObjectPartHandler(w http.ResponseWriter, r *http.Req

 	partID, err := strconv.Atoi(partIDString)
 	if err != nil {
-		s3err.WriteErrorResponse(w, s3err.ErrInvalidPart, r)
+		s3err.WriteErrorResponse(w, r, s3err.ErrInvalidPart)
 		return
 	}

@ -145,7 +145,7 @@ func (s3a *S3ApiServer) CopyObjectPartHandler(w http.ResponseWriter, r *http.Req

 	// check partID with maximum part ID for multipart objects
 	if partID > globalMaxPartID {
-		s3err.WriteErrorResponse(w, s3err.ErrInvalidMaxParts, r)
+		s3err.WriteErrorResponse(w, r, s3err.ErrInvalidMaxParts)
 		return
 	}

@ -158,7 +158,7 @@ func (s3a *S3ApiServer) CopyObjectPartHandler(w http.ResponseWriter, r *http.Req

 	dataReader, err := util.ReadUrlAsReaderCloser(srcUrl, rangeHeader)
 	if err != nil {
-		s3err.WriteErrorResponse(w, s3err.ErrInvalidCopySource, r)
+		s3err.WriteErrorResponse(w, r, s3err.ErrInvalidCopySource)
 		return
 	}
 	defer dataReader.Close()
@ -167,7 +167,7 @@ func (s3a *S3ApiServer) CopyObjectPartHandler(w http.ResponseWriter, r *http.Req
 	etag, errCode := s3a.putToFiler(r, dstUrl, dataReader)

 	if errCode != s3err.ErrNone {
-		s3err.WriteErrorResponse(w, errCode, r)
+		s3err.WriteErrorResponse(w, r, errCode)
 		return
 	}

@ -178,7 +178,7 @@ func (s3a *S3ApiServer) CopyObjectPartHandler(w http.ResponseWriter, r *http.Req
 		LastModified: time.Now().UTC(),
 	}

-	writeSuccessResponseXML(w, response)
+	writeSuccessResponseXML(w, r, response)

 }

--- a/weed/s3api/s3api_object_handlers.go
+++ b/weed/s3api/s3api_object_handlers.go
@ -56,20 +56,20 @@ func (s3a *S3ApiServer) PutObjectHandler(w http.ResponseWriter, r *http.Request)

 	_, err := validateContentMd5(r.Header)
 	if err != nil {
-		s3err.WriteErrorResponse(w, s3err.ErrInvalidDigest, r)
+		s3err.WriteErrorResponse(w, r, s3err.ErrInvalidDigest)
 		return
 	}

 	if r.Header.Get("Cache-Control") != "" {
 		if _, err = cacheobject.ParseRequestCacheControl(r.Header.Get("Cache-Control")); err != nil {
-			s3err.WriteErrorResponse(w, s3err.ErrInvalidDigest, r)
+			s3err.WriteErrorResponse(w, r, s3err.ErrInvalidDigest)
 			return
 		}
 	}

 	if r.Header.Get("Expires") != "" {
 		if _, err = time.Parse(http.TimeFormat, r.Header.Get("Expires")); err != nil {
-			s3err.WriteErrorResponse(w, s3err.ErrInvalidDigest, r)
+			s3err.WriteErrorResponse(w, r, s3err.ErrInvalidDigest)
 			return
 		}
 	}
@ -87,12 +87,12 @@ func (s3a *S3ApiServer) PutObjectHandler(w http.ResponseWriter, r *http.Request)
 			_, s3ErrCode = s3a.iam.reqSignatureV4Verify(r)
 		}
 		if s3ErrCode != s3err.ErrNone {
-			s3err.WriteErrorResponse(w, s3ErrCode, r)
+			s3err.WriteErrorResponse(w, r, s3ErrCode)
 			return
 		}
 	} else {
 		if authTypeStreamingSigned == rAuthType {
-			s3err.WriteErrorResponse(w, s3err.ErrAuthNotSetup, r)
+			s3err.WriteErrorResponse(w, r, s3err.ErrAuthNotSetup)
 			return
 		}
 	}
@ -100,7 +100,7 @@ func (s3a *S3ApiServer) PutObjectHandler(w http.ResponseWriter, r *http.Request)

 	if strings.HasSuffix(object, "/") {
 		if err := s3a.mkdir(s3a.option.BucketsPath, bucket+object, nil); err != nil {
-			s3err.WriteErrorResponse(w, s3err.ErrInternalError, r)
+			s3err.WriteErrorResponse(w, r, s3err.ErrInternalError)
 			return
 		}
 	} else {
@ -113,14 +113,14 @@ func (s3a *S3ApiServer) PutObjectHandler(w http.ResponseWriter, r *http.Request)
 		etag, errCode := s3a.putToFiler(r, uploadUrl, dataReader)

 		if errCode != s3err.ErrNone {
-			s3err.WriteErrorResponse(w, errCode, r)
+			s3err.WriteErrorResponse(w, r, errCode)
 			return
 		}

 		setEtag(w, etag)
 	}

-	writeSuccessResponseEmpty(w)
+	writeSuccessResponseEmpty(w, r)
 }

 func urlPathEscape(object string) string {
@ -137,7 +137,7 @@ func (s3a *S3ApiServer) GetObjectHandler(w http.ResponseWriter, r *http.Request)
 	glog.V(3).Infof("GetObjectHandler %s %s", bucket, object)

 	if strings.HasSuffix(r.URL.Path, "/") {
-		s3err.WriteErrorResponse(w, s3err.ErrNotImplemented, r)
+		s3err.WriteErrorResponse(w, r, s3err.ErrNotImplemented)
 		return
 	}

@ -215,13 +215,13 @@ func (s3a *S3ApiServer) DeleteMultipleObjectsHandler(w http.ResponseWriter, r *h

 	deleteXMLBytes, err := io.ReadAll(r.Body)
 	if err != nil {
-		s3err.WriteErrorResponse(w, s3err.ErrInternalError, r)
+		s3err.WriteErrorResponse(w, r, s3err.ErrInternalError)
 		return
 	}

 	deleteObjects := &DeleteObjectsRequest{}
 	if err := xml.Unmarshal(deleteXMLBytes, deleteObjects); err != nil {
-		s3err.WriteErrorResponse(w, s3err.ErrMalformedXML, r)
+		s3err.WriteErrorResponse(w, r, s3err.ErrMalformedXML)
 		return
 	}

@ -273,7 +273,7 @@ func (s3a *S3ApiServer) DeleteMultipleObjectsHandler(w http.ResponseWriter, r *h
 	}
 	deleteResp.Errors = deleteErrors

-	writeSuccessResponseXML(w, deleteResp)
+	writeSuccessResponseXML(w, r, deleteResp)

 }

@ -317,7 +317,7 @@ func (s3a *S3ApiServer) proxyToFiler(w http.ResponseWriter, r *http.Request, des

 	if err != nil {
 		glog.Errorf("NewRequest %s: %v", destUrl, err)
-		s3err.WriteErrorResponse(w, s3err.ErrInternalError, r)
+		s3err.WriteErrorResponse(w, r, s3err.ErrInternalError)
 		return
 	}

@ -346,19 +346,19 @@ func (s3a *S3ApiServer) proxyToFiler(w http.ResponseWriter, r *http.Request, des

 	if postErr != nil {
 		glog.Errorf("post to filer: %v", postErr)
-		s3err.WriteErrorResponse(w, s3err.ErrInternalError, r)
+		s3err.WriteErrorResponse(w, r, s3err.ErrInternalError)
 		return
 	}
 	defer util.CloseResponse(resp)

 	if resp.StatusCode == http.StatusPreconditionFailed {
-		s3err.WriteErrorResponse(w, s3err.ErrPreconditionFailed, r)
+		s3err.WriteErrorResponse(w, r, s3err.ErrPreconditionFailed)
 		return
 	}

 	if (resp.ContentLength == -1 || resp.StatusCode == 404) && resp.StatusCode != 304 {
 		if r.Method != "DELETE" {
-			s3err.WriteErrorResponse(w, s3err.ErrNoSuchKey, r)
+			s3err.WriteErrorResponse(w, r, s3err.ErrNoSuchKey)
 			return
 		}
 	}
--- a/weed/s3api/s3api_object_handlers_postpolicy.go
+++ b/weed/s3api/s3api_object_handlers_postpolicy.go
@ -29,23 +29,23 @@ func (s3a *S3ApiServer) PostPolicyBucketHandler(w http.ResponseWriter, r *http.R

 	reader, err := r.MultipartReader()
 	if err != nil {
-		s3err.WriteErrorResponse(w, s3err.ErrMalformedPOSTRequest, r)
+		s3err.WriteErrorResponse(w, r, s3err.ErrMalformedPOSTRequest)
 		return
 	}
 	form, err := reader.ReadForm(int64(5 * humanize.MiByte))
 	if err != nil {
-		s3err.WriteErrorResponse(w, s3err.ErrMalformedPOSTRequest, r)
+		s3err.WriteErrorResponse(w, r, s3err.ErrMalformedPOSTRequest)
 		return
 	}
 	defer form.RemoveAll()

 	fileBody, fileName, fileSize, formValues, err := extractPostPolicyFormValues(form)
 	if err != nil {
-		s3err.WriteErrorResponse(w, s3err.ErrMalformedPOSTRequest, r)
+		s3err.WriteErrorResponse(w, r, s3err.ErrMalformedPOSTRequest)
 		return
 	}
 	if fileBody == nil {
-		s3err.WriteErrorResponse(w, s3err.ErrPOSTFileRequired, r)
+		s3err.WriteErrorResponse(w, r, s3err.ErrPOSTFileRequired)
 		return
 	}
 	defer fileBody.Close()
@ -63,7 +63,7 @@ func (s3a *S3ApiServer) PostPolicyBucketHandler(w http.ResponseWriter, r *http.R
 	if successRedirect != "" {
 		redirectURL, err = url.Parse(successRedirect)
 		if err != nil {
-			s3err.WriteErrorResponse(w, s3err.ErrMalformedPOSTRequest, r)
+			s3err.WriteErrorResponse(w, r, s3err.ErrMalformedPOSTRequest)
 			return
 		}
 	}
@ -71,13 +71,13 @@ func (s3a *S3ApiServer) PostPolicyBucketHandler(w http.ResponseWriter, r *http.R
 	// Verify policy signature.
 	errCode := s3a.iam.doesPolicySignatureMatch(formValues)
 	if errCode != s3err.ErrNone {
-		s3err.WriteErrorResponse(w, errCode, r)
+		s3err.WriteErrorResponse(w, r, errCode)
 		return
 	}

 	policyBytes, err := base64.StdEncoding.DecodeString(formValues.Get("Policy"))
 	if err != nil {
-		s3err.WriteErrorResponse(w, s3err.ErrMalformedPOSTRequest, r)
+		s3err.WriteErrorResponse(w, r, s3err.ErrMalformedPOSTRequest)
 		return
 	}

@ -86,7 +86,7 @@ func (s3a *S3ApiServer) PostPolicyBucketHandler(w http.ResponseWriter, r *http.R

 		postPolicyForm, err := policy.ParsePostPolicyForm(string(policyBytes))
 		if err != nil {
-			s3err.WriteErrorResponse(w, s3err.ErrPostPolicyConditionInvalidFormat, r)
+			s3err.WriteErrorResponse(w, r, s3err.ErrPostPolicyConditionInvalidFormat)
 			return
 		}

@ -102,12 +102,12 @@ func (s3a *S3ApiServer) PostPolicyBucketHandler(w http.ResponseWriter, r *http.R
 		lengthRange := postPolicyForm.Conditions.ContentLengthRange
 		if lengthRange.Valid {
 			if fileSize < lengthRange.Min {
-				s3err.WriteErrorResponse(w, s3err.ErrEntityTooSmall, r)
+				s3err.WriteErrorResponse(w, r, s3err.ErrEntityTooSmall)
 				return
 			}

 			if fileSize > lengthRange.Max {
-				s3err.WriteErrorResponse(w, s3err.ErrEntityTooLarge, r)
+				s3err.WriteErrorResponse(w, r, s3err.ErrEntityTooLarge)
 				return
 			}
 		}
@ -118,7 +118,7 @@ func (s3a *S3ApiServer) PostPolicyBucketHandler(w http.ResponseWriter, r *http.R
 	etag, errCode := s3a.putToFiler(r, uploadUrl, fileBody)

 	if errCode != s3err.ErrNone {
-		s3err.WriteErrorResponse(w, errCode, r)
+		s3err.WriteErrorResponse(w, r, errCode)
 		return
 	}

@ -126,7 +126,7 @@ func (s3a *S3ApiServer) PostPolicyBucketHandler(w http.ResponseWriter, r *http.R
 		// Replace raw query params..
 		redirectURL.RawQuery = getRedirectPostRawQuery(bucket, object, etag)
 		w.Header().Set("Location", redirectURL.String())
-		s3err.WriteEmptyResponse(w, http.StatusSeeOther)
+		s3err.WriteEmptyResponse(w, r, http.StatusSeeOther)
 		return
 	}

@ -141,11 +141,11 @@ func (s3a *S3ApiServer) PostPolicyBucketHandler(w http.ResponseWriter, r *http.R
 			ETag:     `"` + etag + `"`,
 			Location: w.Header().Get("Location"),
 		}
-		s3err.WriteXMLResponse(w, http.StatusCreated, resp)
+		s3err.WriteXMLResponse(w, r, http.StatusCreated, resp)
 	case "200":
-		s3err.WriteEmptyResponse(w, http.StatusOK)
+		s3err.WriteEmptyResponse(w, r, http.StatusOK)
 	default:
-		writeSuccessResponseEmpty(w)
+		writeSuccessResponseEmpty(w, r)
 	}

 }
--- a/weed/s3api/s3api_object_multipart_handlers.go
+++ b/weed/s3api/s3api_object_multipart_handlers.go
@ -45,11 +45,11 @@ func (s3a *S3ApiServer) NewMultipartUploadHandler(w http.ResponseWriter, r *http
 	glog.V(2).Info("NewMultipartUploadHandler", string(s3err.EncodeXMLResponse(response)), errCode)

 	if errCode != s3err.ErrNone {
-		s3err.WriteErrorResponse(w, errCode, r)
+		s3err.WriteErrorResponse(w, r, errCode)
 		return
 	}

-	writeSuccessResponseXML(w, response)
+	writeSuccessResponseXML(w, r, response)

 }

@ -69,11 +69,11 @@ func (s3a *S3ApiServer) CompleteMultipartUploadHandler(w http.ResponseWriter, r
 	glog.V(2).Info("CompleteMultipartUploadHandler", string(s3err.EncodeXMLResponse(response)), errCode)

 	if errCode != s3err.ErrNone {
-		s3err.WriteErrorResponse(w, errCode, r)
+		s3err.WriteErrorResponse(w, r, errCode)
 		return
 	}

-	writeSuccessResponseXML(w, response)
+	writeSuccessResponseXML(w, r, response)

 }

@ -91,13 +91,13 @@ func (s3a *S3ApiServer) AbortMultipartUploadHandler(w http.ResponseWriter, r *ht
 	})

 	if errCode != s3err.ErrNone {
-		s3err.WriteErrorResponse(w, errCode, r)
+		s3err.WriteErrorResponse(w, r, errCode)
 		return
 	}

 	glog.V(2).Info("AbortMultipartUploadHandler", string(s3err.EncodeXMLResponse(response)))

-	writeSuccessResponseXML(w, response)
+	writeSuccessResponseXML(w, r, response)

 }

@ -107,13 +107,13 @@ func (s3a *S3ApiServer) ListMultipartUploadsHandler(w http.ResponseWriter, r *ht

 	prefix, keyMarker, uploadIDMarker, delimiter, maxUploads, encodingType := getBucketMultipartResources(r.URL.Query())
 	if maxUploads < 0 {
-		s3err.WriteErrorResponse(w, s3err.ErrInvalidMaxUploads, r)
+		s3err.WriteErrorResponse(w, r, s3err.ErrInvalidMaxUploads)
 		return
 	}
 	if keyMarker != "" {
 		// Marker not common with prefix is not implemented.
 		if !strings.HasPrefix(keyMarker, prefix) {
-			s3err.WriteErrorResponse(w, s3err.ErrNotImplemented, r)
+			s3err.WriteErrorResponse(w, r, s3err.ErrNotImplemented)
 			return
 		}
 	}
@ -131,13 +131,13 @@ func (s3a *S3ApiServer) ListMultipartUploadsHandler(w http.ResponseWriter, r *ht
 	glog.V(2).Infof("ListMultipartUploadsHandler %s errCode=%d", string(s3err.EncodeXMLResponse(response)), errCode)

 	if errCode != s3err.ErrNone {
-		s3err.WriteErrorResponse(w, errCode, r)
+		s3err.WriteErrorResponse(w, r, errCode)
 		return
 	}

 	// TODO handle encodingType

-	writeSuccessResponseXML(w, response)
+	writeSuccessResponseXML(w, r, response)
 }

 // ListObjectPartsHandler - Lists object parts in a multipart upload.
@ -146,11 +146,11 @@ func (s3a *S3ApiServer) ListObjectPartsHandler(w http.ResponseWriter, r *http.Re

 	uploadID, partNumberMarker, maxParts, _ := getObjectResources(r.URL.Query())
 	if partNumberMarker < 0 {
-		s3err.WriteErrorResponse(w, s3err.ErrInvalidPartNumberMarker, r)
+		s3err.WriteErrorResponse(w, r, s3err.ErrInvalidPartNumberMarker)
 		return
 	}
 	if maxParts < 0 {
-		s3err.WriteErrorResponse(w, s3err.ErrInvalidMaxParts, r)
+		s3err.WriteErrorResponse(w, r, s3err.ErrInvalidMaxParts)
 		return
 	}

@ -165,11 +165,11 @@ func (s3a *S3ApiServer) ListObjectPartsHandler(w http.ResponseWriter, r *http.Re
 	glog.V(2).Infof("ListObjectPartsHandler %s count=%d", string(s3err.EncodeXMLResponse(response)), len(response.Part))

 	if errCode != s3err.ErrNone {
-		s3err.WriteErrorResponse(w, errCode, r)
+		s3err.WriteErrorResponse(w, r, errCode)
 		return
 	}

-	writeSuccessResponseXML(w, response)
+	writeSuccessResponseXML(w, r, response)

 }

@ -180,18 +180,18 @@ func (s3a *S3ApiServer) PutObjectPartHandler(w http.ResponseWriter, r *http.Requ
 	uploadID := r.URL.Query().Get("uploadId")
 	exists, err := s3a.exists(s3a.genUploadsFolder(bucket), uploadID, true)
 	if !exists {
-		s3err.WriteErrorResponse(w, s3err.ErrNoSuchUpload, r)
+		s3err.WriteErrorResponse(w, r, s3err.ErrNoSuchUpload)
 		return
 	}

 	partIDString := r.URL.Query().Get("partNumber")
 	partID, err := strconv.Atoi(partIDString)
 	if err != nil {
-		s3err.WriteErrorResponse(w, s3err.ErrInvalidPart, r)
+		s3err.WriteErrorResponse(w, r, s3err.ErrInvalidPart)
 		return
 	}
 	if partID > globalMaxPartID {
-		s3err.WriteErrorResponse(w, s3err.ErrInvalidMaxParts, r)
+		s3err.WriteErrorResponse(w, r, s3err.ErrInvalidMaxParts)
 		return
 	}

@ -208,7 +208,7 @@ func (s3a *S3ApiServer) PutObjectPartHandler(w http.ResponseWriter, r *http.Requ
 			_, s3ErrCode = s3a.iam.reqSignatureV4Verify(r)
 		}
 		if s3ErrCode != s3err.ErrNone {
-			s3err.WriteErrorResponse(w, s3ErrCode, r)
+			s3err.WriteErrorResponse(w, r, s3ErrCode)
 			return
 		}
 	}
@ -225,13 +225,13 @@ func (s3a *S3ApiServer) PutObjectPartHandler(w http.ResponseWriter, r *http.Requ

 	etag, errCode := s3a.putToFiler(r, uploadUrl, dataReader)
 	if errCode != s3err.ErrNone {
-		s3err.WriteErrorResponse(w, errCode, r)
+		s3err.WriteErrorResponse(w, r, errCode)
 		return
 	}

 	setEtag(w, etag)

-	writeSuccessResponseEmpty(w)
+	writeSuccessResponseEmpty(w, r)

 }

--- a/weed/s3api/s3api_object_tagging_handlers.go
+++ b/weed/s3api/s3api_object_tagging_handlers.go
@ -26,15 +26,15 @@ func (s3a *S3ApiServer) GetObjectTaggingHandler(w http.ResponseWriter, r *http.R
 	if err != nil {
 		if err == filer_pb.ErrNotFound {
 			glog.Errorf("GetObjectTaggingHandler %s: %v", r.URL, err)
-			s3err.WriteErrorResponse(w, s3err.ErrNoSuchKey, r)
+			s3err.WriteErrorResponse(w, r, s3err.ErrNoSuchKey)
 		} else {
 			glog.Errorf("GetObjectTaggingHandler %s: %v", r.URL, err)
-			s3err.WriteErrorResponse(w, s3err.ErrInternalError, r)
+			s3err.WriteErrorResponse(w, r, s3err.ErrInternalError)
 		}
 		return
 	}

-	writeSuccessResponseXML(w, FromTags(tags))
+	writeSuccessResponseXML(w, r, FromTags(tags))

 }

@ -52,29 +52,29 @@ func (s3a *S3ApiServer) PutObjectTaggingHandler(w http.ResponseWriter, r *http.R
 	input, err := io.ReadAll(io.LimitReader(r.Body, r.ContentLength))
 	if err != nil {
 		glog.Errorf("PutObjectTaggingHandler read input %s: %v", r.URL, err)
-		s3err.WriteErrorResponse(w, s3err.ErrInternalError, r)
+		s3err.WriteErrorResponse(w, r, s3err.ErrInternalError)
 		return
 	}
 	if err = xml.Unmarshal(input, tagging); err != nil {
 		glog.Errorf("PutObjectTaggingHandler Unmarshal %s: %v", r.URL, err)
-		s3err.WriteErrorResponse(w, s3err.ErrMalformedXML, r)
+		s3err.WriteErrorResponse(w, r, s3err.ErrMalformedXML)
 		return
 	}
 	tags := tagging.ToTags()
 	if len(tags) > 10 {
 		glog.Errorf("PutObjectTaggingHandler tags %s: %d tags more than 10", r.URL, len(tags))
-		s3err.WriteErrorResponse(w, s3err.ErrInvalidTag, r)
+		s3err.WriteErrorResponse(w, r, s3err.ErrInvalidTag)
 		return
 	}
 	for k, v := range tags {
 		if len(k) > 128 {
 			glog.Errorf("PutObjectTaggingHandler tags %s: tag key %s longer than 128", r.URL, k)
-			s3err.WriteErrorResponse(w, s3err.ErrInvalidTag, r)
+			s3err.WriteErrorResponse(w, r, s3err.ErrInvalidTag)
 			return
 		}
 		if len(v) > 256 {
 			glog.Errorf("PutObjectTaggingHandler tags %s: tag value %s longer than 256", r.URL, v)
-			s3err.WriteErrorResponse(w, s3err.ErrInvalidTag, r)
+			s3err.WriteErrorResponse(w, r, s3err.ErrInvalidTag)
 			return
 		}
 	}
@ -82,10 +82,10 @@ func (s3a *S3ApiServer) PutObjectTaggingHandler(w http.ResponseWriter, r *http.R
 	if err = s3a.setTags(dir, name, tagging.ToTags()); err != nil {
 		if err == filer_pb.ErrNotFound {
 			glog.Errorf("PutObjectTaggingHandler setTags %s: %v", r.URL, err)
-			s3err.WriteErrorResponse(w, s3err.ErrNoSuchKey, r)
+			s3err.WriteErrorResponse(w, r, s3err.ErrNoSuchKey)
 		} else {
 			glog.Errorf("PutObjectTaggingHandler setTags %s: %v", r.URL, err)
-			s3err.WriteErrorResponse(w, s3err.ErrInternalError, r)
+			s3err.WriteErrorResponse(w, r, s3err.ErrInternalError)
 		}
 		return
 	}
@ -108,10 +108,10 @@ func (s3a *S3ApiServer) DeleteObjectTaggingHandler(w http.ResponseWriter, r *htt
 	if err != nil {
 		if err == filer_pb.ErrNotFound {
 			glog.Errorf("DeleteObjectTaggingHandler %s: %v", r.URL, err)
-			s3err.WriteErrorResponse(w, s3err.ErrNoSuchKey, r)
+			s3err.WriteErrorResponse(w, r, s3err.ErrNoSuchKey)
 		} else {
 			glog.Errorf("DeleteObjectTaggingHandler %s: %v", r.URL, err)
-			s3err.WriteErrorResponse(w, s3err.ErrInternalError, r)
+			s3err.WriteErrorResponse(w, r, s3err.ErrInternalError)
 		}
 		return
 	}
--- a/weed/s3api/s3api_objects_list_handlers.go
+++ b/weed/s3api/s3api_objects_list_handlers.go
@ -45,11 +45,11 @@ func (s3a *S3ApiServer) ListObjectsV2Handler(w http.ResponseWriter, r *http.Requ
 	originalPrefix, continuationToken, startAfter, delimiter, _, maxKeys := getListObjectsV2Args(r.URL.Query())

 	if maxKeys < 0 {
-		s3err.WriteErrorResponse(w, s3err.ErrInvalidMaxKeys, r)
+		s3err.WriteErrorResponse(w, r, s3err.ErrInvalidMaxKeys)
 		return
 	}
 	if delimiter != "" && delimiter != "/" {
-		s3err.WriteErrorResponse(w, s3err.ErrNotImplemented, r)
+		s3err.WriteErrorResponse(w, r, s3err.ErrNotImplemented)
 		return
 	}

@ -61,13 +61,13 @@ func (s3a *S3ApiServer) ListObjectsV2Handler(w http.ResponseWriter, r *http.Requ
 	response, err := s3a.listFilerEntries(bucket, originalPrefix, maxKeys, marker, delimiter)

 	if err != nil {
-		s3err.WriteErrorResponse(w, s3err.ErrInternalError, r)
+		s3err.WriteErrorResponse(w, r, s3err.ErrInternalError)
 		return
 	}

 	if len(response.Contents) == 0 {
 		if exists, existErr := s3a.exists(s3a.option.BucketsPath, bucket, true); existErr == nil && !exists {
-			s3err.WriteErrorResponse(w, s3err.ErrNoSuchBucket, r)
+			s3err.WriteErrorResponse(w, r, s3err.ErrNoSuchBucket)
 			return
 		}
 	}
@ -87,7 +87,7 @@ func (s3a *S3ApiServer) ListObjectsV2Handler(w http.ResponseWriter, r *http.Requ
 		StartAfter:            startAfter,
 	}

-	writeSuccessResponseXML(w, responseV2)
+	writeSuccessResponseXML(w, r, responseV2)
 }

 func (s3a *S3ApiServer) ListObjectsV1Handler(w http.ResponseWriter, r *http.Request) {
@ -101,29 +101,29 @@ func (s3a *S3ApiServer) ListObjectsV1Handler(w http.ResponseWriter, r *http.Requ
 	originalPrefix, marker, delimiter, maxKeys := getListObjectsV1Args(r.URL.Query())

 	if maxKeys < 0 {
-		s3err.WriteErrorResponse(w, s3err.ErrInvalidMaxKeys, r)
+		s3err.WriteErrorResponse(w, r, s3err.ErrInvalidMaxKeys)
 		return
 	}
 	if delimiter != "" && delimiter != "/" {
-		s3err.WriteErrorResponse(w, s3err.ErrNotImplemented, r)
+		s3err.WriteErrorResponse(w, r, s3err.ErrNotImplemented)
 		return
 	}

 	response, err := s3a.listFilerEntries(bucket, originalPrefix, maxKeys, marker, delimiter)

 	if err != nil {
-		s3err.WriteErrorResponse(w, s3err.ErrInternalError, r)
+		s3err.WriteErrorResponse(w, r, s3err.ErrInternalError)
 		return
 	}

 	if len(response.Contents) == 0 {
 		if exists, existErr := s3a.exists(s3a.option.BucketsPath, bucket, true); existErr == nil && !exists {
-			s3err.WriteErrorResponse(w, s3err.ErrNoSuchBucket, r)
+			s3err.WriteErrorResponse(w, r, s3err.ErrNoSuchBucket)
 			return
 		}
 	}

-	writeSuccessResponseXML(w, response)
+	writeSuccessResponseXML(w, r, response)
 }

 func (s3a *S3ApiServer) listFilerEntries(bucket string, originalPrefix string, maxKeys int, marker string, delimiter string) (response ListBucketResult, err error) {
@ -220,12 +220,16 @@ func (s3a *S3ApiServer) doListFilerEntries(client filer_pb.SeaweedFilerClient, d
 			err = subErr
 			return
 		}
+		counter += subCounter
 		isTruncated = isTruncated || subIsTruncated
 		maxKeys -= subCounter
 		nextMarker = subDir + "/" + subNextMarker
 		// finished processing this sub directory
 		marker = subDir
 	}
+	if maxKeys <= 0 {
+		return
+	}

 	// now marker is also a direct child of dir
 	request := &filer_pb.ListEntriesRequest{
--- a/weed/s3api/s3api_server.go
+++ b/weed/s3api/s3api_server.go
@ -66,7 +66,7 @@ func (s3a *S3ApiServer) registerRouter(router *mux.Router) {
 		// HeadObject
 		bucket.Methods("HEAD").Path("/{object:.+}").HandlerFunc(track(s3a.iam.Auth(s3a.HeadObjectHandler, ACTION_READ), "GET"))
 		// HeadBucket
-		bucket.Methods("HEAD").HandlerFunc(track(s3a.iam.Auth(s3a.HeadBucketHandler, ACTION_ADMIN), "GET"))
+		bucket.Methods("HEAD").HandlerFunc(track(s3a.iam.Auth(s3a.HeadBucketHandler, ACTION_READ), "GET"))

 		// CopyObjectPart
 		bucket.Methods("PUT").Path("/{object:.+}").HeadersRegexp("X-Amz-Copy-Source", `.*?(\/|%2F).*?`).HandlerFunc(track(s3a.iam.Auth(s3a.CopyObjectPartHandler, ACTION_WRITE), "PUT")).Queries("partNumber", "{partNumber:[0-9]+}", "uploadId", "{uploadId:.*}")
@ -137,7 +137,7 @@ func (s3a *S3ApiServer) registerRouter(router *mux.Router) {
 		bucket.Methods("GET").HandlerFunc(track(s3a.iam.Auth(s3a.ListObjectsV1Handler, ACTION_LIST), "LIST"))

 		// PutBucket
-		bucket.Methods("PUT").HandlerFunc(track(s3a.iam.Auth(s3a.PutBucketHandler, ACTION_ADMIN), "PUT"))
+		bucket.Methods("PUT").HandlerFunc(track(s3a.PutBucketHandler, "PUT"))

 		// DeleteBucket
 		bucket.Methods("DELETE").HandlerFunc(track(s3a.iam.Auth(s3a.DeleteBucketHandler, ACTION_WRITE), "DELETE"))
--- a/weed/s3api/s3api_status_handlers.go
+++ b/weed/s3api/s3api_status_handlers.go
@ -4,5 +4,5 @@ import "net/http"

 func (s3a *S3ApiServer) StatusHandler(w http.ResponseWriter, r *http.Request) {
 	// write out the response code and content type header
-	writeSuccessResponseEmpty(w)
+	writeSuccessResponseEmpty(w, r)
 }
--- a/weed/s3api/s3err/error_handler.go
+++ b/weed/s3api/s3err/error_handler.go
@ -19,15 +19,15 @@ const (
 	MimeXML  mimeType = "application/xml"
 )

-func WriteXMLResponse(w http.ResponseWriter, statusCode int, response interface{}) {
-	WriteResponse(w, statusCode, EncodeXMLResponse(response), MimeXML)
+func WriteXMLResponse(w http.ResponseWriter, r *http.Request, statusCode int, response interface{}) {
+	WriteResponse(w, r, statusCode, EncodeXMLResponse(response), MimeXML)
 }

-func WriteEmptyResponse(w http.ResponseWriter, statusCode int) {
-	WriteResponse(w, statusCode, []byte{}, mimeNone)
+func WriteEmptyResponse(w http.ResponseWriter, r *http.Request, statusCode int) {
+	WriteResponse(w, r, statusCode, []byte{}, mimeNone)
 }

-func WriteErrorResponse(w http.ResponseWriter, errorCode ErrorCode, r *http.Request) {
+func WriteErrorResponse(w http.ResponseWriter, r *http.Request, errorCode ErrorCode) {
 	vars := mux.Vars(r)
 	bucket := vars["bucket"]
 	object := vars["object"]
@ -38,7 +38,7 @@ func WriteErrorResponse(w http.ResponseWriter, errorCode ErrorCode, r *http.Requ
 	apiError := GetAPIError(errorCode)
 	errorResponse := getRESTErrorResponse(apiError, r.URL.Path, bucket, object)
 	encodedErrorResponse := EncodeXMLResponse(errorResponse)
-	WriteResponse(w, apiError.HTTPStatusCode, encodedErrorResponse, MimeXML)
+	WriteResponse(w, r, apiError.HTTPStatusCode, encodedErrorResponse, MimeXML)
 }

 func getRESTErrorResponse(err APIError, resource string, bucket, object string) RESTErrorResponse {
@ -61,13 +61,17 @@ func EncodeXMLResponse(response interface{}) []byte {
 	return bytesBuffer.Bytes()
 }

-func setCommonHeaders(w http.ResponseWriter) {
+func setCommonHeaders(w http.ResponseWriter, r *http.Request) {
 	w.Header().Set("x-amz-request-id", fmt.Sprintf("%d", time.Now().UnixNano()))
 	w.Header().Set("Accept-Ranges", "bytes")
+	if r.Header.Get("Origin") != "" {
+		w.Header().Set("Access-Control-Allow-Origin", "*")
+		w.Header().Set("Access-Control-Allow-Credentials", "true")
+	}
 }

-func WriteResponse(w http.ResponseWriter, statusCode int, response []byte, mType mimeType) {
-	setCommonHeaders(w)
+func WriteResponse(w http.ResponseWriter, r *http.Request, statusCode int, response []byte, mType mimeType) {
+	setCommonHeaders(w, r)
 	if response != nil {
 		w.Header().Set("Content-Length", strconv.Itoa(len(response)))
 	}
@ -88,5 +92,5 @@ func WriteResponse(w http.ResponseWriter, statusCode int, response []byte, mType
 // If none of the http routes match respond with MethodNotAllowed
 func NotFoundHandler(w http.ResponseWriter, r *http.Request) {
 	glog.V(0).Infof("unsupported %s %s", r.Method, r.RequestURI)
-	WriteErrorResponse(w, ErrMethodNotAllowed, r)
+	WriteErrorResponse(w, r, ErrMethodNotAllowed)
 }
--- a/weed/s3api/stats.go
+++ b/weed/s3api/stats.go
@ -2,7 +2,6 @@ package s3api

 import (
 	stats_collect "github.com/chrislusf/seaweedfs/weed/stats"
-	"github.com/chrislusf/seaweedfs/weed/util"
 	"net/http"
 	"strconv"
 	"time"
@ -28,7 +27,7 @@ func (r *StatusRecorder) Flush() {

 func track(f http.HandlerFunc, action string) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
-		w.Header().Set("Server", "SeaweedFS S3 "+util.VERSION)
+		w.Header().Set("Server", "SeaweedFS S3")
 		recorder := NewStatusResponseWriter(w)
 		start := time.Now()
 		f(recorder, r)
--- a/weed/server/filer_grpc_server_remote.go
+++ b/weed/server/filer_grpc_server_remote.go
@ -17,7 +17,7 @@ import (
 	"time"
 )

-func (fs *FilerServer) DownloadToLocal(ctx context.Context, req *filer_pb.DownloadToLocalRequest) (*filer_pb.DownloadToLocalResponse, error) {
+func (fs *FilerServer) CacheRemoteObjectToLocalCluster(ctx context.Context, req *filer_pb.CacheRemoteObjectToLocalClusterRequest) (*filer_pb.CacheRemoteObjectToLocalClusterResponse, error) {

 	// load all mappings
 	mappingEntry, err := fs.filer.FindEntry(ctx, util.JoinPath(filer.DirectoryEtcRemote, filer.REMOTE_STORAGE_MOUNT_FILE))
@ -57,7 +57,7 @@ func (fs *FilerServer) DownloadToLocal(ctx context.Context, req *filer_pb.Downlo
 		return nil, err
 	}

-	resp := &filer_pb.DownloadToLocalResponse{}
+	resp := &filer_pb.CacheRemoteObjectToLocalClusterResponse{}
 	if entry.Remote == nil || entry.Remote.RemoteSize == 0 {
 		return resp, nil
 	}
--- a/weed/server/filer_grpc_server_rename.go
+++ b/weed/server/filer_grpc_server_rename.go
@ -161,7 +161,7 @@ func (fs *FilerServer) moveSelfEntry(ctx context.Context, stream filer_pb.Seawee
 		if err := stream.Send(&filer_pb.StreamRenameEntryResponse{
 			Directory: string(newParent),
 			EventNotification: &filer_pb.EventNotification{
-				OldEntry:           &filer_pb.Entry{
+				OldEntry: &filer_pb.Entry{
 					Name: entry.Name(),
 				},
 				NewEntry:           newEntry.ToProtoEntry(),
--- a/weed/server/filer_server.go
+++ b/weed/server/filer_server.go
@ -61,7 +61,6 @@ type FilerOption struct {
 	recursiveDelete       bool
 	Cipher                bool
 	SaveToFilerLimit      int64
-	Filers                []pb.ServerAddress
 	ConcurrentUploadLimit int64
 }

@ -108,7 +107,7 @@ func NewFilerServer(defaultMux, readonlyMux *http.ServeMux, option *FilerOption)
 	fs.checkWithMaster()

 	go stats.LoopPushingMetric("filer", string(fs.option.Host), fs.metricsAddress, fs.metricsIntervalSec)
-	go fs.filer.KeepConnectedToMaster()
+	go fs.filer.KeepMasterClientConnected()

 	v := util.GetViper()
 	if !util.LoadConfiguration("filer", false) {
@ -143,7 +142,7 @@ func NewFilerServer(defaultMux, readonlyMux *http.ServeMux, option *FilerOption)
 		readonlyMux.HandleFunc("/", fs.readonlyFilerHandler)
 	}

-	fs.filer.AggregateFromPeers(option.Host, option.Filers)
+	fs.filer.AggregateFromPeers(option.Host)

 	fs.filer.LoadBuckets()

--- a/weed/server/filer_server_handlers_read.go
+++ b/weed/server/filer_server_handlers_read.go
@ -169,11 +169,11 @@ func (fs *FilerServer) GetOrHeadHandler(w http.ResponseWriter, r *http.Request)
 		chunks := entry.Chunks
 		if entry.IsInRemoteOnly() {
 			dir, name := entry.FullPath.DirAndName()
-			if resp, err := fs.DownloadToLocal(context.Background(), &filer_pb.DownloadToLocalRequest{
+			if resp, err := fs.CacheRemoteObjectToLocalCluster(context.Background(), &filer_pb.CacheRemoteObjectToLocalClusterRequest{
 				Directory: dir,
 				Name:      name,
 			}); err != nil {
-				glog.Errorf("DownloadToLocal %s: %v", entry.FullPath, err)
+				glog.Errorf("CacheRemoteObjectToLocalCluster %s: %v", entry.FullPath, err)
 				return fmt.Errorf("cache %s: %v", entry.FullPath, err)
 			} else {
 				chunks = resp.Entry.Chunks
--- a/weed/server/master_grpc_server.go
+++ b/weed/server/master_grpc_server.go
@ -6,7 +6,6 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/storage/backend"
 	"github.com/chrislusf/seaweedfs/weed/util"
 	"net"
-	"strings"
 	"time"

 	"github.com/chrislusf/raft"
@ -45,11 +44,7 @@ func (ms *MasterServer) SendHeartbeat(stream master_pb.Seaweed_SendHeartbeatServ
 			}

 			if len(message.DeletedVids) > 0 {
-				ms.clientChansLock.RLock()
-				for _, ch := range ms.clientChans {
-					ch <- message
-				}
-				ms.clientChansLock.RUnlock()
+				ms.broadcastToClients(&master_pb.KeepConnectedResponse{VolumeLocation: message})
 			}
 		}
 	}()
@ -154,12 +149,7 @@ func (ms *MasterServer) SendHeartbeat(stream master_pb.Seaweed_SendHeartbeatServ

 		}
 		if len(message.NewVids) > 0 || len(message.DeletedVids) > 0 {
-			ms.clientChansLock.RLock()
-			for host, ch := range ms.clientChans {
-				glog.V(0).Infof("master send to %s: %s", host, message.String())
-				ch <- message
-			}
-			ms.clientChansLock.RUnlock()
+			ms.broadcastToClients(&master_pb.KeepConnectedResponse{VolumeLocation: message})
 		}

 		// tell the volume servers about the leader
@ -195,12 +185,20 @@ func (ms *MasterServer) KeepConnected(stream master_pb.Seaweed_KeepConnectedServ
 	// buffer by 1 so we don't end up getting stuck writing to stopChan forever
 	stopChan := make(chan bool, 1)

-	clientName, messageChan := ms.addClient(req.Name, peerAddress)
+	clientName, messageChan := ms.addClient(req.ClientType, peerAddress)
+	for _, update := range ms.Cluster.AddClusterNode(req.ClientType, peerAddress, req.Version) {
+		ms.broadcastToClients(update)
+	}

-	defer ms.deleteClient(clientName)
+	defer func() {
+		for _, update := range ms.Cluster.RemoveClusterNode(req.ClientType, peerAddress) {
+			ms.broadcastToClients(update)
+		}
+		ms.deleteClient(clientName)
+	}()

 	for _, message := range ms.Topo.ToVolumeLocations() {
-		if sendErr := stream.Send(message); sendErr != nil {
+		if sendErr := stream.Send(&master_pb.KeepConnectedResponse{VolumeLocation: message}); sendErr != nil {
 			return sendErr
 		}
 	}
@ -235,21 +233,31 @@ func (ms *MasterServer) KeepConnected(stream master_pb.Seaweed_KeepConnectedServ

 }

+func (ms *MasterServer) broadcastToClients(message *master_pb.KeepConnectedResponse) {
+	ms.clientChansLock.RLock()
+	for _, ch := range ms.clientChans {
+		ch <- message
+	}
+	ms.clientChansLock.RUnlock()
+}
+
 func (ms *MasterServer) informNewLeader(stream master_pb.Seaweed_KeepConnectedServer) error {
 	leader, err := ms.Topo.Leader()
 	if err != nil {
 		glog.Errorf("topo leader: %v", err)
 		return raft.NotLeaderError
 	}
-	if err := stream.Send(&master_pb.VolumeLocation{
-		Leader: string(leader),
+	if err := stream.Send(&master_pb.KeepConnectedResponse{
+		VolumeLocation: &master_pb.VolumeLocation{
+			Leader: string(leader),
+		},
 	}); err != nil {
 		return err
 	}
 	return nil
 }

-func (ms *MasterServer) addClient(clientType string, clientAddress pb.ServerAddress) (clientName string, messageChan chan *master_pb.VolumeLocation) {
+func (ms *MasterServer) addClient(clientType string, clientAddress pb.ServerAddress) (clientName string, messageChan chan *master_pb.KeepConnectedResponse) {
 	clientName = clientType + "@" + string(clientAddress)
 	glog.V(0).Infof("+ client %v", clientName)

@ -258,7 +266,7 @@ func (ms *MasterServer) addClient(clientType string, clientAddress pb.ServerAddr
 	// trying to send to it in SendHeartbeat and so we can't lock the
 	// clientChansLock to remove the channel and we're stuck writing to it
 	// 100 is probably overkill
-	messageChan = make(chan *master_pb.VolumeLocation, 100)
+	messageChan = make(chan *master_pb.KeepConnectedResponse, 100)

 	ms.clientChansLock.Lock()
 	ms.clientChans[clientName] = messageChan
@ -295,19 +303,6 @@ func findClientAddress(ctx context.Context, grpcPort uint32) string {

 }

-func (ms *MasterServer) ListMasterClients(ctx context.Context, req *master_pb.ListMasterClientsRequest) (*master_pb.ListMasterClientsResponse, error) {
-	resp := &master_pb.ListMasterClientsResponse{}
-	ms.clientChansLock.RLock()
-	defer ms.clientChansLock.RUnlock()
-
-	for k := range ms.clientChans {
-		if strings.HasPrefix(k, req.ClientType+"@") {
-			resp.GrpcAddresses = append(resp.GrpcAddresses, k[len(req.ClientType)+1:])
-		}
-	}
-	return resp, nil
-}
-
 func (ms *MasterServer) GetMasterConfiguration(ctx context.Context, req *master_pb.GetMasterConfigurationRequest) (*master_pb.GetMasterConfigurationResponse, error) {

 	// tell the volume servers about the leader
--- a/weed/server/master_grpc_server_cluster.go
+++ b/weed/server/master_grpc_server_cluster.go
@ -0,0 +1,21 @@
+package weed_server
+
+import (
+	"context"
+	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
+)
+
+func (ms *MasterServer) ListClusterNodes(ctx context.Context, req *master_pb.ListClusterNodesRequest) (*master_pb.ListClusterNodesResponse, error) {
+	resp := &master_pb.ListClusterNodesResponse{}
+
+	clusterNodes := ms.Cluster.ListClusterNode(req.ClientType)
+
+	for _, node := range clusterNodes {
+		resp.ClusterNodes = append(resp.ClusterNodes, &master_pb.ListClusterNodesResponse_ClusterNode{
+			Address: string(node.Address),
+			Version: node.Version,
+			IsLeader: ms.Cluster.IsOneLeader(node.Address),
+		})
+	}
+	return resp, nil
+}
--- a/weed/server/master_server.go
+++ b/weed/server/master_server.go
@ -2,6 +2,7 @@ package weed_server

 import (
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/cluster"
 	"github.com/chrislusf/seaweedfs/weed/pb"
 	"net/http"
 	"net/http/httputil"
@ -60,13 +61,15 @@ type MasterServer struct {

 	// notifying clients
 	clientChansLock sync.RWMutex
-	clientChans     map[string]chan *master_pb.VolumeLocation
+	clientChans     map[string]chan *master_pb.KeepConnectedResponse

 	grpcDialOption grpc.DialOption

 	MasterClient *wdclient.MasterClient

 	adminLocks *AdminLocks
+
+	Cluster *cluster.Cluster
 }

 func NewMasterServer(r *mux.Router, option *MasterOption, peers []pb.ServerAddress) *MasterServer {
@ -99,10 +102,11 @@ func NewMasterServer(r *mux.Router, option *MasterOption, peers []pb.ServerAddre
 		option:          option,
 		preallocateSize: preallocateSize,
 		vgCh:            make(chan *topology.VolumeGrowRequest, 1<<6),
-		clientChans:     make(map[string]chan *master_pb.VolumeLocation),
+		clientChans:     make(map[string]chan *master_pb.KeepConnectedResponse),
 		grpcDialOption:  grpcDialOption,
-		MasterClient:    wdclient.NewMasterClient(grpcDialOption, "master", option.Master, "", peers),
+		MasterClient:    wdclient.NewMasterClient(grpcDialOption, cluster.MasterType, option.Master, "", peers),
 		adminLocks:      NewAdminLocks(),
+		Cluster:         cluster.NewCluster(),
 	}
 	ms.boundedLeaderChan = make(chan int, 16)

--- a/weed/server/volume_grpc_copy.go
+++ b/weed/server/volume_grpc_copy.go
@ -80,7 +80,7 @@ func (vs *VolumeServer) VolumeCopy(req *volume_server_pb.VolumeCopyRequest, stre

 		// println("source:", volFileInfoResp.String())
 		copyResponse := &volume_server_pb.VolumeCopyResponse{}
-		reportInterval := int64(1024*1024*128)
+		reportInterval := int64(1024 * 1024 * 128)
 		nextReportTarget := reportInterval
 		var modifiedTsNs int64
 		var sendErr error
--- a/weed/server/volume_grpc_tier_upload.go
+++ b/weed/server/volume_grpc_tier_upload.go
@ -62,13 +62,8 @@ func (vs *VolumeServer) VolumeTierMoveDatToRemote(req *volume_server_pb.VolumeTi
 		})
 	}

-	// remember the file original source
-	attributes := make(map[string]string)
-	attributes["volumeId"] = v.Id.String()
-	attributes["collection"] = v.Collection
-	attributes["ext"] = ".dat"
 	// copy the data file
-	key, size, err := backendStorage.CopyFile(diskFile.File, attributes, fn)
+	key, size, err := backendStorage.CopyFile(diskFile.File, fn)
 	if err != nil {
 		return fmt.Errorf("backend %s copy file %s: %v", req.DestinationBackendName, diskFile.Name(), err)
 	}
--- a/weed/server/volume_grpc_vacuum.go
+++ b/weed/server/volume_grpc_vacuum.go
@ -27,7 +27,7 @@ func (vs *VolumeServer) VacuumVolumeCheck(ctx context.Context, req *volume_serve
 func (vs *VolumeServer) VacuumVolumeCompact(req *volume_server_pb.VacuumVolumeCompactRequest, stream volume_server_pb.VolumeServer_VacuumVolumeCompactServer) error {

 	resp := &volume_server_pb.VacuumVolumeCompactResponse{}
-	reportInterval := int64(1024*1024*128)
+	reportInterval := int64(1024 * 1024 * 128)
 	nextReportTarget := reportInterval

 	var sendErr error
--- a/weed/shell/command_cluster_ps.go
+++ b/weed/shell/command_cluster_ps.go
@ -0,0 +1,55 @@
+package shell
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/cluster"
+	"io"
+
+	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
+)
+
+func init() {
+	Commands = append(Commands, &commandClusterPs{})
+}
+
+type commandClusterPs struct {
+}
+
+func (c *commandClusterPs) Name() string {
+	return "cluster.ps"
+}
+
+func (c *commandClusterPs) Help() string {
+	return `check current cluster process status
+
+	cluster.ps
+
+`
+}
+
+func (c *commandClusterPs) Do(args []string, commandEnv *CommandEnv, writer io.Writer) (err error) {
+
+	clusterPsCommand := flag.NewFlagSet(c.Name(), flag.ContinueOnError)
+	if err = clusterPsCommand.Parse(args); err != nil {
+		return nil
+	}
+
+	err = commandEnv.MasterClient.WithClient(func(client master_pb.SeaweedClient) error {
+		resp, err := client.ListClusterNodes(context.Background(), &master_pb.ListClusterNodesRequest{
+			ClientType: cluster.FilerType,
+		})
+
+		fmt.Fprintf(writer, "the cluster has %d filers\n", len(resp.ClusterNodes))
+		for _, node := range resp.ClusterNodes {
+			fmt.Fprintf(writer, "  * %s (%v)\n", node.Address, node.Version)
+		}
+		return err
+	})
+	if err != nil {
+		return
+	}
+
+	return nil
+}
--- a/weed/shell/command_ec_encode.go
+++ b/weed/shell/command_ec_encode.go
@ -6,6 +6,7 @@ import (
 	"fmt"
 	"github.com/chrislusf/seaweedfs/weed/pb"
 	"io"
+	"math/rand"
 	"sync"
 	"time"

@ -33,7 +34,7 @@ func (c *commandEcEncode) Name() string {
 func (c *commandEcEncode) Help() string {
 	return `apply erasure coding to a volume

-	ec.encode [-collection=""] [-fullPercent=95] [-quietFor=1h]
+	ec.encode [-collection=""] [-fullPercent=95 -quietFor=1h]
 	ec.encode [-collection=""] [-volumeId=<volume_id>]

 	This command will:
@ -248,7 +249,7 @@ func parallelCopyEcShardsFromSource(grpcDialOption grpc.DialOption, targetServer
 func balancedEcDistribution(servers []*EcNode) (allocated [][]uint32) {
 	allocated = make([][]uint32, len(servers))
 	allocatedShardIdIndex := uint32(0)
-	serverIndex := 0
+	serverIndex := rand.Intn(len(servers))
 	for allocatedShardIdIndex < erasure_coding.TotalShardsCount {
 		if servers[serverIndex].freeEcSlot > 0 {
 			allocated[serverIndex] = append(allocated[serverIndex], allocatedShardIdIndex)
--- a/weed/shell/command_remote_cache.go
+++ b/weed/shell/command_remote_cache.go
@ -26,7 +26,7 @@ func (c *commandRemoteCache) Help() string {
 	return `cache the file content for mounted directories or files

 	# assume a remote storage is configured to name "cloud1"
-	remote.configure -name=cloud1 -type=s3 -access_key=xxx -secret_key=yyy
+	remote.configure -name=cloud1 -type=s3 -s3.access_key=xxx -s3.secret_key=yyy
 	# mount and pull one bucket
 	remote.mount -dir=/xxx -remote=cloud1/bucket

@ -163,10 +163,10 @@ func (c *commandRemoteCache) cacheContentData(commandEnv *CommandEnv, writer io.

 			remoteLocation := filer.MapFullPathToRemoteStorageLocation(localMountedDir, remoteMountedLocation, dir.Child(entry.Name))

-			if err := filer.DownloadToLocal(commandEnv, remoteConf, remoteLocation, dir, entry); err != nil {
-				fmt.Fprintf(writer, "DownloadToLocal %+v: %v\n", remoteLocation, err)
+			if err := filer.CacheRemoteObjectToLocalCluster(commandEnv, remoteConf, remoteLocation, dir, entry); err != nil {
+				fmt.Fprintf(writer, "CacheRemoteObjectToLocalCluster %+v: %v\n", remoteLocation, err)
 				if executionErr == nil {
-					executionErr = fmt.Errorf("DownloadToLocal %+v: %v\n", remoteLocation, err)
+					executionErr = fmt.Errorf("CacheRemoteObjectToLocalCluster %+v: %v\n", remoteLocation, err)
 				}
 				return
 			}
--- a/weed/shell/command_remote_meta_sync.go
+++ b/weed/shell/command_remote_meta_sync.go
@ -27,7 +27,7 @@ func (c *commandRemoteMetaSync) Help() string {
 	return `synchronize the local file meta data with the remote file metadata

 	# assume a remote storage is configured to name "cloud1"
-	remote.configure -name=cloud1 -type=s3 -access_key=xxx -secret_key=yyy
+	remote.configure -name=cloud1 -type=s3 -s3.access_key=xxx -s3.secret_key=yyy
 	# mount and pull one bucket
 	remote.mount -dir=/xxx -remote=cloud1/bucket

--- a/weed/shell/command_remote_mount.go
+++ b/weed/shell/command_remote_mount.go
@ -32,7 +32,7 @@ func (c *commandRemoteMount) Help() string {
 	return `mount remote storage and pull its metadata

 	# assume a remote storage is configured to name "cloud1"
-	remote.configure -name=cloud1 -type=s3 -access_key=xxx -secret_key=yyy
+	remote.configure -name=cloud1 -type=s3 -s3.access_key=xxx -s3.secret_key=yyy

 	# mount and pull one bucket
 	remote.mount -dir=/xxx -remote=cloud1/bucket
--- a/weed/shell/command_remote_mount_buckets.go
+++ b/weed/shell/command_remote_mount_buckets.go
@ -27,7 +27,7 @@ func (c *commandRemoteMountBuckets) Help() string {
 	return `mount all buckets in remote storage and pull its metadata

 	# assume a remote storage is configured to name "cloud1"
-	remote.configure -name=cloud1 -type=s3 -access_key=xxx -secret_key=yyy
+	remote.configure -name=cloud1 -type=s3 -s3.access_key=xxx -s3.secret_key=yyy

 	# mount all buckets
 	remote.mount.buckets -remote=cloud1
--- a/weed/shell/command_remote_unmount.go
+++ b/weed/shell/command_remote_unmount.go
@ -27,7 +27,7 @@ func (c *commandRemoteUnmount) Help() string {
 	return `unmount remote storage

 	# assume a remote storage is configured to name "s3_1"
-	remote.configure -name=s3_1 -type=s3 -access_key=xxx -secret_key=yyy
+	remote.configure -name=s3_1 -type=s3 -s3.access_key=xxx -s3.secret_key=yyy
 	# mount and pull one bucket
 	remote.mount -dir=/xxx -remote=s3_1/bucket

--- a/weed/shell/command_volume_fix_replication_test.go
+++ b/weed/shell/command_volume_fix_replication_test.go
@ -261,6 +261,29 @@ func TestSatisfyReplicaPlacement00x(t *testing.T) {

 }

+func TestSatisfyReplicaPlacement100(t *testing.T) {
+
+	var tests = []testcase{
+		{
+			name:        "test 100",
+			replication: "100",
+			replicas: []*VolumeReplica{
+				{
+					location: &location{"dc1", "r1", &master_pb.DataNodeInfo{Id: "dn1"}},
+				},
+				{
+					location: &location{"dc1", "r2", &master_pb.DataNodeInfo{Id: "dn2"}},
+				},
+			},
+			possibleLocation: location{"dc2", "r3", &master_pb.DataNodeInfo{Id: "dn3"}},
+			expected:         true,
+		},
+	}
+
+	runTests(tests, t)
+
+}
+
 func runTests(tests []testcase, t *testing.T) {
 	for _, tt := range tests {
 		replicaPlacement, _ := super_block.NewReplicaPlacementFromString(tt.replication)
--- a/weed/shell/shell_liner.go
+++ b/weed/shell/shell_liner.go
@ -3,9 +3,13 @@ package shell
 import (
 	"context"
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/cluster"
+	"github.com/chrislusf/seaweedfs/weed/pb"
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
 	"github.com/chrislusf/seaweedfs/weed/util/grace"
 	"io"
+	"math/rand"
 	"os"
 	"path"
 	"regexp"
@ -47,6 +51,29 @@ func RunShell(options ShellOptions) {
 	go commandEnv.MasterClient.KeepConnectedToMaster()
 	commandEnv.MasterClient.WaitUntilConnected()

+	if commandEnv.option.FilerAddress == "" {
+		var filers []pb.ServerAddress
+		commandEnv.MasterClient.WithClient(func(client master_pb.SeaweedClient) error {
+			resp, err := client.ListClusterNodes(context.Background(), &master_pb.ListClusterNodesRequest{
+				ClientType: cluster.FilerType,
+			})
+			if err != nil {
+				return err
+			}
+
+			for _, clusterNode := range resp.ClusterNodes {
+				filers = append(filers, pb.ServerAddress(clusterNode.Address))
+			}
+			return nil
+		})
+		fmt.Printf("master: %s ", *options.Masters)
+		if len(filers) > 0 {
+			fmt.Printf("filers: %v", filers)
+			commandEnv.option.FilerAddress = filers[rand.Intn(len(filers))]
+		}
+		fmt.Println()
+	}
+
 	if commandEnv.option.FilerAddress != "" {
 		commandEnv.WithFilerClient(func(filerClient filer_pb.SeaweedFilerClient) error {
 			resp, err := filerClient.GetFilerConfiguration(context.Background(), &filer_pb.GetFilerConfigurationRequest{})
--- a/weed/storage/backend/backend.go
+++ b/weed/storage/backend/backend.go
@ -25,7 +25,7 @@ type BackendStorageFile interface {
 type BackendStorage interface {
 	ToProperties() map[string]string
 	NewStorageFile(key string, tierInfo *volume_server_pb.VolumeInfo) BackendStorageFile
-	CopyFile(f *os.File, attributes map[string]string, fn func(progressed int64, percentage float32) error) (key string, size int64, err error)
+	CopyFile(f *os.File, fn func(progressed int64, percentage float32) error) (key string, size int64, err error)
 	DownloadFile(fileName string, key string, fn func(progressed int64, percentage float32) error) (size int64, err error)
 	DeleteFile(key string) (err error)
 }
--- a/weed/storage/backend/s3_backend/s3_backend.go
+++ b/weed/storage/backend/s3_backend/s3_backend.go
@ -79,13 +79,13 @@ func (s *S3BackendStorage) NewStorageFile(key string, tierInfo *volume_server_pb
 	return f
 }

-func (s *S3BackendStorage) CopyFile(f *os.File, attributes map[string]string, fn func(progressed int64, percentage float32) error) (key string, size int64, err error) {
+func (s *S3BackendStorage) CopyFile(f *os.File, fn func(progressed int64, percentage float32) error) (key string, size int64, err error) {
 	randomUuid, _ := uuid.NewRandom()
 	key = randomUuid.String()

 	glog.V(1).Infof("copying dat file of %s to remote s3.%s as %s", f.Name(), s.id, key)

-	size, err = uploadToS3(s.conn, f.Name(), s.bucket, key, attributes, fn)
+	size, err = uploadToS3(s.conn, f.Name(), s.bucket, key, fn)

 	return
 }
--- a/weed/storage/backend/s3_backend/s3_sessions.go
+++ b/weed/storage/backend/s3_backend/s3_sessions.go
@ -2,6 +2,8 @@ package s3_backend

 import (
 	"fmt"
+	"github.com/aws/aws-sdk-go/aws/request"
+	"github.com/chrislusf/seaweedfs/weed/util"
 	"sync"

 	"github.com/aws/aws-sdk-go/aws"
@ -47,6 +49,9 @@ func createSession(awsAccessKeyId, awsSecretAccessKey, region, endpoint string)
 	if err != nil {
 		return nil, fmt.Errorf("create aws session in region %s: %v", region, err)
 	}
+	sess.Handlers.Build.PushBack(func(r *request.Request) {
+		r.HTTPRequest.Header.Set("User-Agent", "SeaweedFS/"+util.VERSION_NUMBER)
+	})

 	t := s3.New(sess)

--- a/weed/storage/backend/s3_backend/s3_upload.go
+++ b/weed/storage/backend/s3_backend/s3_upload.go
@ -12,9 +12,7 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/glog"
 )

-func uploadToS3(sess s3iface.S3API, filename string, destBucket string, destKey string,
-	attributes map[string]string,
-	fn func(progressed int64, percentage float32) error) (fileSize int64, err error) {
+func uploadToS3(sess s3iface.S3API, filename string, destBucket string, destKey string, fn func(progressed int64, percentage float32) error) (fileSize int64, err error) {

 	//open the file
 	f, err := os.Open(filename)
@ -48,25 +46,13 @@ func uploadToS3(sess s3iface.S3API, filename string, destBucket string, destKey
 		fn:   fn,
 	}

-	// process tagging
-	tags := ""
-	for k, v := range attributes {
-		if len(tags) > 0 {
-			tags = tags + "&"
-		}
-		tags = tags + k + "=" + v
-	}
-
 	// Upload the file to S3.
 	var result *s3manager.UploadOutput
 	result, err = uploader.Upload(&s3manager.UploadInput{
-		Bucket:               aws.String(destBucket),
-		Key:                  aws.String(destKey),
-		Body:                 fileReader,
-		ACL:                  aws.String("private"),
-		ServerSideEncryption: aws.String("AES256"),
-		StorageClass:         aws.String("STANDARD_IA"),
-		Tagging:              aws.String(tags),
+		Bucket:       aws.String(destBucket),
+		Key:          aws.String(destKey),
+		Body:         fileReader,
+		StorageClass: aws.String("STANDARD_IA"),
 	})

 	//in case it fails to upload
--- a/weed/util/constants.go
+++ b/weed/util/constants.go
@ -5,7 +5,7 @@ import (
 )

 var (
-	VERSION_NUMBER = fmt.Sprintf("%.02f", 2.75)
+	VERSION_NUMBER = fmt.Sprintf("%.02f", 2.77)
 	VERSION        = sizeLimit + " " + VERSION_NUMBER
 	COMMIT         = ""
 )
--- a/weed/wdclient/masterclient.go
+++ b/weed/wdclient/masterclient.go
@ -21,6 +21,8 @@ type MasterClient struct {
 	grpcDialOption grpc.DialOption

 	vidMap
+
+	OnPeerUpdate func(update *master_pb.ClusterNodeUpdate)
 }

 func NewMasterClient(grpcDialOption grpc.DialOption, clientType string, clientHost pb.ServerAddress, clientDataCenter string, masters []pb.ServerAddress) *MasterClient {
@ -93,7 +95,7 @@ func (mc *MasterClient) tryAllMasters() {
 }

 func (mc *MasterClient) tryConnectToMaster(master pb.ServerAddress) (nextHintedLeader pb.ServerAddress) {
-	glog.V(0).Infof("%s masterClient Connecting to master %v", mc.clientType, master)
+	glog.V(1).Infof("%s masterClient Connecting to master %v", mc.clientType, master)
 	gprcErr := pb.WithMasterClient(master, mc.grpcDialOption, func(client master_pb.SeaweedClient) error {

 		ctx, cancel := context.WithCancel(context.Background())
@ -105,7 +107,11 @@ func (mc *MasterClient) tryConnectToMaster(master pb.ServerAddress) (nextHintedL
 			return err
 		}

-		if err = stream.Send(&master_pb.KeepConnectedRequest{Name: mc.clientType, ClientAddress: string(mc.clientHost)}); err != nil {
+		if err = stream.Send(&master_pb.KeepConnectedRequest{
+			ClientType:    mc.clientType,
+			ClientAddress: string(mc.clientHost),
+			Version:       util.Version(),
+		}); err != nil {
 			glog.V(0).Infof("%s masterClient failed to send to %s: %v", mc.clientType, master, err)
 			return err
 		}
@ -114,34 +120,49 @@ func (mc *MasterClient) tryConnectToMaster(master pb.ServerAddress) (nextHintedL
 		mc.currentMaster = master

 		for {
-			volumeLocation, err := stream.Recv()
+			resp, err := stream.Recv()
 			if err != nil {
 				glog.V(0).Infof("%s masterClient failed to receive from %s: %v", mc.clientType, master, err)
 				return err
 			}

-			// maybe the leader is changed
-			if volumeLocation.Leader != "" {
-				glog.V(0).Infof("redirected to leader %v", volumeLocation.Leader)
-				nextHintedLeader = pb.ServerAddress(volumeLocation.Leader)
-				return nil
+			if resp.VolumeLocation != nil {
+				// maybe the leader is changed
+				if resp.VolumeLocation.Leader != "" {
+					glog.V(0).Infof("redirected to leader %v", resp.VolumeLocation.Leader)
+					nextHintedLeader = pb.ServerAddress(resp.VolumeLocation.Leader)
+					return nil
+				}
+
+				// process new volume location
+				loc := Location{
+					Url:        resp.VolumeLocation.Url,
+					PublicUrl:  resp.VolumeLocation.PublicUrl,
+					DataCenter: resp.VolumeLocation.DataCenter,
+					GrpcPort:   int(resp.VolumeLocation.GrpcPort),
+				}
+				for _, newVid := range resp.VolumeLocation.NewVids {
+					glog.V(1).Infof("%s: %s masterClient adds volume %d", mc.clientType, loc.Url, newVid)
+					mc.addLocation(newVid, loc)
+				}
+				for _, deletedVid := range resp.VolumeLocation.DeletedVids {
+					glog.V(1).Infof("%s: %s masterClient removes volume %d", mc.clientType, loc.Url, deletedVid)
+					mc.deleteLocation(deletedVid, loc)
+				}
 			}

-			// process new volume location
-			loc := Location{
-				Url:        volumeLocation.Url,
-				PublicUrl:  volumeLocation.PublicUrl,
-				DataCenter: volumeLocation.DataCenter,
-				GrpcPort:   int(volumeLocation.GrpcPort),
-			}
-			for _, newVid := range volumeLocation.NewVids {
-				glog.V(1).Infof("%s: %s masterClient adds volume %d", mc.clientType, loc.Url, newVid)
-				mc.addLocation(newVid, loc)
-			}
-			for _, deletedVid := range volumeLocation.DeletedVids {
-				glog.V(1).Infof("%s: %s masterClient removes volume %d", mc.clientType, loc.Url, deletedVid)
-				mc.deleteLocation(deletedVid, loc)
+			if resp.ClusterNodeUpdate != nil {
+				update := resp.ClusterNodeUpdate
+				if mc.OnPeerUpdate != nil {
+					if update.IsAdd {
+						glog.V(0).Infof("+ %s %s leader:%v\n", update.NodeType, update.Address, update.IsLeader)
+					} else {
+						glog.V(0).Infof("- %s %s leader:%v\n", update.NodeType, update.Address, update.IsLeader)
+					}
+					mc.OnPeerUpdate(update)
+				}
 			}
+
 		}

 	})