Merge pull request #74 from chrislusf/master

sync
2024-01-19 02:48:24 +00:00 · 2021-03-12 15:05:31 +08:00 · 2021-03-12 15:05:31 +08:00 · 17d02264f3
parent 620b91f23e 5f99eee27c
commit 17d02264f3
121 changed files with 3358 additions and 441 deletions
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@ -40,6 +40,7 @@ jobs:
          goarch: ${{ matrix.goarch }}
          release_tag: dev
          overwrite: true
+          pre_command: export CGO_ENABLED=0
          build_flags: -tags 5BytesOffset # optional, default is
          ldflags: -extldflags -static -X github.com/chrislusf/seaweedfs/weed/util.COMMIT=${{github.sha}}
          # Where to run `go build .`
@ -55,6 +56,7 @@ jobs:
          goarch: ${{ matrix.goarch }}
          release_tag: dev
          overwrite: true
+          pre_command: export CGO_ENABLED=0
          ldflags: -extldflags -static -X github.com/chrislusf/seaweedfs/weed/util.COMMIT=${{github.sha}}
          # Where to run `go build .`
          project_path: weed
--- a/README.md
+++ b/README.md
@ -79,17 +79,34 @@ SeaweedFS is a simple and highly scalable distributed file system. There are two
 1. to store billions of files!
 2. to serve the files fast!

-SeaweedFS started as an Object Store to handle small files efficiently. Instead of managing all file metadata in a central master, the central master only manages volumes on volume servers, and these volume servers manage files and their metadata. This relieves concurrency pressure from the central master and spreads file metadata into volume servers, allowing faster file access (O(1), usually just one disk read operation).
+SeaweedFS started as an Object Store to handle small files efficiently. 
+Instead of managing all file metadata in a central master, 
+the central master only manages volumes on volume servers, 
+and these volume servers manage files and their metadata. 
+This relieves concurrency pressure from the central master and spreads file metadata into volume servers, 
+allowing faster file access (O(1), usually just one disk read operation).

-SeaweedFS can transparently integrate with the cloud. With hot data on local cluster, and warm data on the cloud with O(1) access time, SeaweedFS can achieve both fast local access time and elastic cloud storage capacity. What's more, the cloud storage access API cost is minimized. Faster and Cheaper than direct cloud storage!
+SeaweedFS can transparently integrate with the cloud. 
+With hot data on local cluster, and warm data on the cloud with O(1) access time, 
+SeaweedFS can achieve both fast local access time and elastic cloud storage capacity. 
+What's more, the cloud storage access API cost is minimized. 
+Faster and Cheaper than direct cloud storage!
+Signup for future managed SeaweedFS cluster offering at "seaweedfilesystem at gmail dot com".

-There is only 40 bytes of disk storage overhead for each file's metadata. It is so simple with O(1) disk reads that you are welcome to challenge the performance with your actual use cases.
+There is only 40 bytes of disk storage overhead for each file's metadata. 
+It is so simple with O(1) disk reads that you are welcome to challenge the performance with your actual use cases.

-SeaweedFS started by implementing [Facebook's Haystack design paper](http://www.usenix.org/event/osdi10/tech/full_papers/Beaver.pdf). Also, SeaweedFS implements erasure coding with ideas from [f4: Facebook’s Warm BLOB Storage System](https://www.usenix.org/system/files/conference/osdi14/osdi14-paper-muralidhar.pdf)
+SeaweedFS started by implementing [Facebook's Haystack design paper](http://www.usenix.org/event/osdi10/tech/full_papers/Beaver.pdf). 
+Also, SeaweedFS implements erasure coding with ideas from 
+[f4: Facebook’s Warm BLOB Storage System](https://www.usenix.org/system/files/conference/osdi14/osdi14-paper-muralidhar.pdf), and has a lot of similarities with [Facebook’s Tectonic Filesystem](https://www.usenix.org/system/files/fast21-pan.pdf)

-On top of the object store, optional [Filer] can support directories and POSIX attributes. Filer is a separate linearly-scalable stateless server with customizable metadata stores, e.g., MySql, Postgres, Redis, Cassandra, HBase, Mongodb, Elastic Search, LevelDB, RocksDB, MemSql, TiDB, Etcd, CockroachDB, etc.
+On top of the object store, optional [Filer] can support directories and POSIX attributes. 
+Filer is a separate linearly-scalable stateless server with customizable metadata stores, 
+e.g., MySql, Postgres, Redis, Cassandra, HBase, Mongodb, Elastic Search, LevelDB, RocksDB, MemSql, TiDB, Etcd, CockroachDB, etc.

-For any distributed key value stores, the large values can be offloaded to SeaweedFS. With the fast access speed and linearly scalable capacity, SeaweedFS can work as a distributed [Key-Large-Value store][KeyLargeValueStore].
+For any distributed key value stores, the large values can be offloaded to SeaweedFS. 
+With the fast access speed and linearly scalable capacity, 
+SeaweedFS can work as a distributed [Key-Large-Value store][KeyLargeValueStore].

 [Back to TOC](#table-of-contents)

@ -105,6 +122,7 @@ For any distributed key value stores, the large values can be offloaded to Seawe
 * Support ETag, Accept-Range, Last-Modified, etc.
 * Support in-memory/leveldb/readonly mode tuning for memory/performance balance.
 * Support rebalancing the writable and readonly volumes.
+* [Customizable Multiple Storage Tiers][TieredStorage]: Customizable storage disk types to balance performance and cost.
 * [Transparent cloud integration][CloudTier]: unlimited capacity via tiered cloud storage for warm data.
 * [Erasure Coding for warm storage][ErasureCoding]  Rack-Aware 10.4 erasure coding reduces storage cost and increases availability.

@ -135,6 +153,7 @@ For any distributed key value stores, the large values can be offloaded to Seawe
 [Hadoop]: https://github.com/chrislusf/seaweedfs/wiki/Hadoop-Compatible-File-System
 [WebDAV]: https://github.com/chrislusf/seaweedfs/wiki/WebDAV
 [ErasureCoding]: https://github.com/chrislusf/seaweedfs/wiki/Erasure-coding-for-warm-storage
+[TieredStorage]: https://github.com/chrislusf/seaweedfs/wiki/Tiered-Storage
 [CloudTier]: https://github.com/chrislusf/seaweedfs/wiki/Cloud-Tier
 [FilerDataEncryption]: https://github.com/chrislusf/seaweedfs/wiki/Filer-Data-Encryption
 [FilerTTL]: https://github.com/chrislusf/seaweedfs/wiki/Filer-Stores
--- a/backers.md
+++ b/backers.md
@ -1,3 +1,4 @@
+
 <h1 align="center">Sponsors &amp; Backers</h1>

 - [Become a backer or sponsor on Patreon](https://www.patreon.com/seaweedfs).
@ -12,3 +13,4 @@

 - [ColorfulClouds Tech Co. Ltd.](https://caiyunai.com/)
 - [Haravan - Ecommerce Platform](https://www.haravan.com)
+- PeterCxy - Creator of Shelter App
--- a/docker/Dockerfile.go_build
+++ b/docker/Dockerfile.go_build
@ -6,7 +6,7 @@ ARG BRANCH=${BRANCH:-master}
 RUN cd /go/src/github.com/chrislusf/seaweedfs && git checkout $BRANCH
 RUN cd /go/src/github.com/chrislusf/seaweedfs/weed \
  && export LDFLAGS="-X github.com/chrislusf/seaweedfs/weed/util.COMMIT=$(git rev-parse --short HEAD)" \
-  && go install -ldflags "${LDFLAGS}"
+  && CGO_ENABLED=0 go install -ldflags "-extldflags -static ${LDFLAGS}"

 FROM alpine AS final
 LABEL author="Chris Lu"
--- a/docker/Dockerfile.go_build_large
+++ b/docker/Dockerfile.go_build_large
@ -6,7 +6,7 @@ ARG BRANCH=${BRANCH:-master}
 RUN cd /go/src/github.com/chrislusf/seaweedfs && git checkout $BRANCH
 RUN cd /go/src/github.com/chrislusf/seaweedfs/weed \
  && export LDFLAGS="-X github.com/chrislusf/seaweedfs/weed/util.COMMIT=$(git rev-parse --short HEAD)" \
-  && go install -tags 5BytesOffset -ldflags "${LDFLAGS}"
+  && CGO_ENABLED=0 go install -tags 5BytesOffset -ldflags "-extldflags -static ${LDFLAGS}"

 FROM alpine AS final
 LABEL author="Chris Lu"
--- a/docker/Makefile
+++ b/docker/Makefile
@ -5,7 +5,7 @@ all: gen
 gen: dev

 build:
-	cd ../weed; GOOS=linux go build; mv weed ../docker/
+	cd ../weed; CGO_ENABLED=0 GOOS=linux go build -ldflags "-extldflags -static"; mv weed ../docker/
 	docker build --no-cache -t chrislusf/seaweedfs:local -f Dockerfile.local .
 	rm ./weed

@ -15,6 +15,9 @@ s3tests_build:
 dev: build
 	docker-compose -f compose/local-dev-compose.yml -p seaweedfs up

+dev_tls: build certstrap
+	ENV_FILE="tls.env" docker-compose -f compose/local-dev-compose.yml -p seaweedfs up
+
 dev_mount: build
 	docker-compose -f compose/local-mount-compose.yml -p seaweedfs up

@ -41,3 +44,15 @@ filer_etcd: build

 clean:
 	rm ./weed
+
+certstrap:
+	go get github.com/square/certstrap
+	certstrap --depot-path compose/tls init --passphrase "" --common-name "SeaweedFS CA" || true
+	certstrap --depot-path compose/tls request-cert --passphrase "" --common-name volume01.dev || true
+	certstrap --depot-path compose/tls request-cert --passphrase "" --common-name master01.dev || true
+	certstrap --depot-path compose/tls request-cert --passphrase "" --common-name filer01.dev || true
+	certstrap --depot-path compose/tls request-cert --passphrase "" --common-name client01.dev || true
+	certstrap --depot-path compose/tls sign --CA "SeaweedFS CA" volume01.dev || true
+	certstrap --depot-path compose/tls sign --CA "SeaweedFS CA" master01.dev || true
+	certstrap --depot-path compose/tls sign --CA "SeaweedFS CA" filer01.dev || true
+	certstrap --depot-path compose/tls sign --CA "SeaweedFS CA" client01.dev || true
--- a/docker/compose/dev.env
+++ b/docker/compose/dev.env
--- a/docker/compose/local-clusters-compose.yml
+++ b/docker/compose/local-clusters-compose.yml
@ -11,6 +11,10 @@ services:
      - 8888:8888
      - 18888:18888
    command: "server -ip=server1 -filer -volume.max=0 -master.volumeSizeLimitMB=1024 -volume.preStopSeconds=1"
+    volumes:
+      - ./master-cloud.toml:/etc/seaweedfs/master.toml
+    depends_on:
+      - server2
  server2:
    image: chrislusf/seaweedfs:local
    ports:
@ -20,4 +24,5 @@ services:
      - 18085:18080
      - 8889:8888
      - 18889:18888
-    command: "server -ip=server2 -filer -volume.max=0 -master.volumeSizeLimitMB=1024 -volume.preStopSeconds=1"
+      - 8334:8333
+    command: "server -ip=server2 -filer -s3 -volume.max=0 -master.volumeSizeLimitMB=1024 -volume.preStopSeconds=1"
--- a/docker/compose/local-dev-compose.yml
+++ b/docker/compose/local-dev-compose.yml
@ -6,33 +6,49 @@ services:
    ports:
      - 9333:9333
      - 19333:19333
-    command: "master -ip=master"
+    command: "-v=1 master -ip=master"
+    volumes:
+      - ./tls:/etc/seaweedfs/tls
+    env_file:
+     - ${ENV_FILE:-dev.env}
  volume:
    image: chrislusf/seaweedfs:local
    ports:
      - 8080:8080
      - 18080:18080
-    command: "volume -mserver=master:9333 -port=8080 -ip=volume -preStopSeconds=1"
+    command: "-v=1 volume -mserver=master:9333 -port=8080 -ip=volume -preStopSeconds=1"
    depends_on:
      - master
+    volumes:
+      - ./tls:/etc/seaweedfs/tls
+    env_file:
+      - ${ENV_FILE:-dev.env}
  filer:
    image: chrislusf/seaweedfs:local
    ports:
      - 8888:8888
      - 18888:18888
-    command: 'filer -master="master:9333"'
+    command: '-v=1 filer -master="master:9333"'
    depends_on:
      - master
      - volume
+    volumes:
+      - ./tls:/etc/seaweedfs/tls
+    env_file:
+      - ${ENV_FILE:-dev.env}
  s3:
    image: chrislusf/seaweedfs:local
    ports:
      - 8333:8333
-    command: 's3 -filer="filer:8888"'
+    command: '-v=1 s3 -filer="filer:8888"'
    depends_on:
      - master
      - volume
      - filer
+    volumes:
+      - ./tls:/etc/seaweedfs/tls
+    env_file:
+      - ${ENV_FILE:-dev.env}
  mount:
    image: chrislusf/seaweedfs:local
    privileged: true
@ -40,6 +56,10 @@ services:
      - SYS_ADMIN
    mem_limit: 4096m
    command: '-v=4 mount -filer="filer:8888" -dirAutoCreate -dir=/mnt/seaweedfs -cacheCapacityMB=100 -concurrentWriters=128'
+    volumes:
+      - ./tls:/etc/seaweedfs/tls
+    env_file:
+      - ${ENV_FILE:-dev.env}
    depends_on:
      - master
      - volume
--- a/docker/compose/master-cloud.toml
+++ b/docker/compose/master-cloud.toml
@ -0,0 +1,30 @@
+
+# Put this file to one of the location, with descending priority
+#    ./master.toml
+#    $HOME/.seaweedfs/master.toml
+#    /etc/seaweedfs/master.toml
+# this file is read by master
+
+[master.maintenance]
+# periodically run these scripts are the same as running them from 'weed shell'
+scripts = """
+  lock
+  ec.encode -fullPercent=95 -quietFor=1h
+  ec.rebuild -force
+  ec.balance -force
+  volume.balance -force
+  volume.fix.replication
+  unlock
+"""
+sleep_minutes = 17          # sleep minutes between each script execution
+
+# configurations for tiered cloud storage
+# old volumes are transparently moved to cloud for cost efficiency
+[storage.backend]
+	[storage.backend.s3.default]
+	enabled = true
+	aws_access_key_id     = "any"     # if empty, loads from the shared credentials file (~/.aws/credentials).
+	aws_secret_access_key = "any"     # if empty, loads from the shared credentials file (~/.aws/credentials).
+	region = "us-east-2"
+	bucket = "volume_bucket"    # an existing bucket
+	endpoint = "http://server2:8333"
--- a/docker/compose/tls.env
+++ b/docker/compose/tls.env
@ -0,0 +1,14 @@
+WEED_GRPC_CA=/etc/seaweedfs/tls/SeaweedFS_CA.crt
+WEED_GRPC_ALLOWED_WILDCARD_DOMAIN=".dev"
+WEED_GRPC_MASTER_CERT=/etc/seaweedfs/tls/master01.dev.crt
+WEED_GRPC_MASTER_KEY=/etc/seaweedfs/tls/master01.dev.key
+WEED_GRPC_VOLUME_CERT=/etc/seaweedfs/tls/volume01.dev.crt
+WEED_GRPC_VOLUME_KEY=/etc/seaweedfs/tls/volume01.dev.key
+WEED_GRPC_FILER_CERT=/etc/seaweedfs/tls/filer01.dev.crt
+WEED_GRPC_FILER_KEY=/etc/seaweedfs/tls/filer01.dev.key
+WEED_GRPC_CLIENT_CERT=/etc/seaweedfs/tls/client01.dev.crt
+WEED_GRPC_CLIENT_KEY=/etc/seaweedfs/tls/client01.dev.key
+WEED_GRPC_MASTER_ALLOWED_COMMONNAMES="volume01.dev,master01.dev,filer01.dev,client01.dev"
+WEED_GRPC_VOLUME_ALLOWED_COMMONNAMES="volume01.dev,master01.dev,filer01.dev,client01.dev"
+WEED_GRPC_FILER_ALLOWED_COMMONNAMES="volume01.dev,master01.dev,filer01.dev,client01.dev"
+WEED_GRPC_CLIENT_ALLOWED_COMMONNAMES="volume01.dev,master01.dev,filer01.dev,client01.dev"
--- a/docker/entrypoint.sh
+++ b/docker/entrypoint.sh
@ -60,9 +60,9 @@ case "$1" in
  'cronjob')
 	MASTER=${WEED_MASTER-localhost:9333}
 	FIX_REPLICATION_CRON_SCHEDULE=${CRON_SCHEDULE-*/7 * * * * *}
-	echo "$FIX_REPLICATION_CRON_SCHEDULE" 'echo "volume.fix.replication" | weed shell -master='$MASTER > /crontab
+	echo "$FIX_REPLICATION_CRON_SCHEDULE" 'echo "lock; volume.fix.replication; unlock" | weed shell -master='$MASTER > /crontab
 	BALANCING_CRON_SCHEDULE=${CRON_SCHEDULE-25 * * * * *}
-	echo "$BALANCING_CRON_SCHEDULE" 'echo "volume.balance -c ALL -force" | weed shell -master='$MASTER >> /crontab
+	echo "$BALANCING_CRON_SCHEDULE" 'echo "lock; volume.balance -collection ALL_COLLECTIONS -force; unlock" | weed shell -master='$MASTER >> /crontab
 	echo "Running Crontab:"
 	cat /crontab
 	exec supercronic /crontab
--- a/go.mod
+++ b/go.mod
@ -38,6 +38,7 @@ require (
 	github.com/google/uuid v1.1.1
 	github.com/gorilla/mux v1.7.4
 	github.com/gorilla/websocket v1.4.1 // indirect
+	github.com/grpc-ecosystem/go-grpc-middleware v1.0.1-0.20190118093823-f849b5445de4 // indirect
 	github.com/grpc-ecosystem/grpc-gateway v1.11.0 // indirect
 	github.com/jcmturner/gofork v1.0.0 // indirect
 	github.com/json-iterator/go v1.1.10
@ -48,7 +49,7 @@ require (
 	github.com/klauspost/crc32 v1.2.0
 	github.com/klauspost/reedsolomon v1.9.2
 	github.com/kurin/blazer v0.5.3
-	github.com/lib/pq v1.2.0
+	github.com/lib/pq v1.10.0
 	github.com/lunixbochs/vtclean v1.0.0 // indirect
 	github.com/magiconair/properties v1.8.1 // indirect
 	github.com/mattn/go-colorable v0.1.2 // indirect
--- a/go.sum
+++ b/go.sum
@ -496,6 +496,8 @@ github.com/kurin/blazer v0.5.3/go.mod h1:4FCXMUWo9DllR2Do4TtBd377ezyAJ51vB5uTBjt
 github.com/lib/pq v1.1.1/go.mod h1:5WUZQaWbwv1U+lTReE5YruASi9Al49XbQIvNi/34Woo=
 github.com/lib/pq v1.2.0 h1:LXpIM/LZ5xGFhOpXAQUIMM1HdyqzVYM13zNdjCEEcA0=
 github.com/lib/pq v1.2.0/go.mod h1:5WUZQaWbwv1U+lTReE5YruASi9Al49XbQIvNi/34Woo=
+github.com/lib/pq v1.10.0 h1:Zx5DJFEYQXio93kgXnQ09fXNiUKsqv4OUEu2UtGcB1E=
+github.com/lib/pq v1.10.0/go.mod h1:AlVN5x4E4T544tWzH6hKfbfQvm3HdbOxrmggDNAPY9o=
 github.com/lightstep/lightstep-tracer-common/golang/gogo v0.0.0-20190605223551-bc2310a04743/go.mod h1:qklhhLq1aX+mtWk9cPHPzaBjWImj5ULL6C7HFJtXQMM=
 github.com/lightstep/lightstep-tracer-go v0.18.1/go.mod h1:jlF1pusYV4pidLvZ+XD0UBX0ZE6WURAspgAczcDHrL4=
 github.com/lunixbochs/vtclean v1.0.0 h1:xu2sLAri4lGiovBDQKxl5mrXyESr3gUr5m5SM5+LVb8=
--- a/k8s/README.md
+++ b/k8s/README.md
@ -29,6 +29,14 @@ please set/update the corresponding affinity rule in values.yaml to an empty one

 ```affinity: ""```

+### PVC - storage class ###
+
+on the volume stateful set added support for K8S PVC, currently example
+with the simple local-path-provisioner from Rancher (comes included with k3d / k3s)
+https://github.com/rancher/local-path-provisioner
+
+you can use ANY storage class you like, just update the correct storage-class
+for your deployment.

 ### current instances config (AIO):
 1 instance for each type (master/filer+s3/volume)
--- a/k8s/seaweedfs/Chart.yaml
+++ b/k8s/seaweedfs/Chart.yaml
@ -1,5 +1,5 @@
 apiVersion: v1
 description: SeaweedFS
 name: seaweedfs
-appVersion: "2.27"
-version: 2.27
+appVersion: "2.31"
+version: 2.31
--- a/k8s/seaweedfs/templates/_helpers.tpl
+++ b/k8s/seaweedfs/templates/_helpers.tpl
@ -126,3 +126,26 @@ Inject extra environment vars in the format key:value, if populated
 {{- printf "%s%s%s:%s" $registryName $repositoryName $name $tag -}}
 {{- end -}}
 {{- end -}}
+
+
+{{/* check if any PVC exists */}}
+{{- define "volume.pvc_exists" -}}
+{{- if or (or (eq .Values.volume.data.type "persistentVolumeClaim") (and (eq .Values.volume.idx.type "persistentVolumeClaim") .Values.volume.dir_idx )) (eq .Values.volume.logs.type "persistentVolumeClaim") -}}
+{{- printf "true" -}}
+{{- else -}}
+{{- printf "false" -}}
+{{- end -}}
+{{- end -}}
+
+{{/* check if any HostPath exists */}}
+{{- define "volume.hostpath_exists" -}}
+{{- if or (or (eq .Values.volume.data.type "hostPath") (and (eq .Values.volume.idx.type "hostPath") .Values.volume.dir_idx )) (eq .Values.volume.logs.type "hostPath") -}}
+{{- printf "true" -}}
+{{- else -}}
+{{- if or .Values.global.enableSecurity .Values.volume.extraVolumes -}}
+{{- printf "true" -}}
+{{- else -}}
+{{- printf "false" -}}
+{{- end -}}
+{{- end -}}
+{{- end -}}
--- a/k8s/seaweedfs/templates/cronjob.yaml
+++ b/k8s/seaweedfs/templates/cronjob.yaml
@ -40,7 +40,7 @@ spec:
                  {{ if .Values.volume.dataCenter }} -dataCenter {{ .Values.volume.dataCenter }}{{ end }}\
                  {{ if .Values.cronjob.collection }} -collection {{ .Values.cronjob.collection }}{{ end }}\n\
                  {{- if .Values.cronjob.enableFixReplication }}
-                  volume.fix.replication {{ if .Values.cronjob.collectionPattern }} -collectionPattern={{ .Values.cronjob.collectionPattern }} {{ end }} \n\
+                  volume.fix.replication -collectionPattern={{ .Values.cronjob.collectionPattern }} \n\
                  {{- end }}
                  unlock\n" | \
                  /usr/bin/weed shell \
--- a/k8s/seaweedfs/templates/filer-service-client.yaml
+++ b/k8s/seaweedfs/templates/filer-service-client.yaml
@ -10,6 +10,7 @@ metadata:
    monitoring: "true"
 {{- end }}
 spec:
+  clusterIP: None
  ports:
  - name: "swfs-filer"
    port: {{ .Values.filer.port }}
--- a/k8s/seaweedfs/templates/volume-statefulset.yaml
+++ b/k8s/seaweedfs/templates/volume-statefulset.yaml
@ -45,6 +45,19 @@ spec:
      priorityClassName: {{ .Values.volume.priorityClassName | quote }}
      {{- end }}
      enableServiceLinks: false
+      {{- if .Values.volume.dir_idx }}
+      initContainers:
+        - name: seaweedfs-vol-move-idx
+          image: {{ template "volume.image" . }}
+          imagePullPolicy: {{ .Values.global.pullPolicy | default "IfNotPresent" }}
+          command: [ '/bin/sh', '-c' ]
+          args: ['if ls {{ .Values.volume.dir }}/*.idx >/dev/null 2>&1; then mv {{ .Values.volume.dir }}/*.idx {{ .Values.volume.dir_idx }}/; fi;']
+          volumeMounts:
+          - name: idx
+            mountPath: {{ .Values.volume.dir_idx }}
+          - name: data
+            mountPath: {{ .Values.volume.dir }}
+      {{- end }}
      containers:
        - name: seaweedfs
          image: {{ template "volume.image" . }}
@ -118,9 +131,13 @@ spec:
                -compactionMBps={{ .Values.volume.compactionMBps }} \
                -mserver={{ range $index := until (.Values.master.replicas | int) }}${SEAWEEDFS_FULLNAME}-master-{{ $index }}.${SEAWEEDFS_FULLNAME}-master:{{ $.Values.master.port }}{{ if lt $index (sub ($.Values.master.replicas | int) 1) }},{{ end }}{{ end }}
          volumeMounts:
-            - name: seaweedfs-volume-storage
-              mountPath: "/data/"
-            - name: seaweedfs-volume-log-volume
+            - name: data
+              mountPath: "{{ .Values.volume.dir }}/"
+            {{- if .Values.volume.dir_idx }}
+            - name: idx
+              mountPath: "{{ .Values.volume.dir_idx }}/"
+            {{- end }}
+            - name: logs
              mountPath: "/logs/"
            {{- if .Values.global.enableSecurity }}
            - name: security-config
@ -173,15 +190,27 @@ spec:
          resources:
            {{ tpl .Values.volume.resources . | nindent 12 | trim }}
          {{- end }}
+      {{- $hostpath_exists := include "volume.hostpath_exists" . -}}
+      {{- if $hostpath_exists }}
      volumes:
-        - name: seaweedfs-volume-log-volume
-          hostPath:
-            path: /storage/logs/seaweedfs/volume
-            type: DirectoryOrCreate
-        - name: seaweedfs-volume-storage
+        {{- if eq .Values.volume.data.type "hostPath" }}
+        - name: data
          hostPath:
            path: /storage/object_store/
            type: DirectoryOrCreate
+        {{- end }}
+        {{- if and (eq .Values.volume.idx.type "hostPath") .Values.volume.dir_idx }}
+        - name: idx
+          hostPath:
+            path: /ssd/seaweedfs-volume-idx/
+            type: DirectoryOrCreate
+        {{- end }}
+        {{- if eq .Values.volume.logs.type "hostPath" }}
+        - name: logs
+          hostPath:
+            path: /storage/logs/seaweedfs/volume
+            type: DirectoryOrCreate
+        {{- end }}
        {{- if .Values.global.enableSecurity }}
        - name: security-config
          configMap:
@ -205,8 +234,43 @@ spec:
      {{- if .Values.volume.extraVolumes }}
        {{ tpl .Values.volume.extraVolumes . | indent 8 | trim }}
      {{- end }}
+      {{- end }}
      {{- if .Values.volume.nodeSelector }}
      nodeSelector:
        {{ tpl .Values.volume.nodeSelector . | indent 8 | trim }}
      {{- end }}
+  {{- $pvc_exists := include "volume.pvc_exists" . -}}
+  {{- if $pvc_exists }}
+  volumeClaimTemplates:
+    {{- if eq .Values.volume.data.type "persistentVolumeClaim"}}
+    - metadata:
+        name: data
+      spec:
+        accessModes: [ "ReadWriteOnce" ]
+        storageClassName: {{ .Values.volume.data.storageClass }}
+        resources:
+          requests:
+            storage: {{ .Values.volume.data.size }}
+    {{- end }}
+    {{- if and (eq .Values.volume.idx.type "persistentVolumeClaim") .Values.volume.dir_idx }}
+    - metadata:
+        name: idx
+      spec:
+        accessModes: [ "ReadWriteOnce" ]
+        storageClassName: {{ .Values.volume.idx.storageClass }}
+        resources:
+          requests:
+            storage: {{ .Values.volume.idx.size }}
+    {{- end }}
+    {{- if eq .Values.volume.logs.type "persistentVolumeClaim" }}
+    - metadata:
+        name: logs
+      spec:
+        accessModes: [ "ReadWriteOnce" ]
+        storageClassName: {{ .Values.volume.logs.storageClass }}
+        resources:
+          requests:
+            storage: {{ .Values.volume.logs.size }}
+    {{- end }}
+      {{- end }}
 {{- end }}
--- a/k8s/seaweedfs/values.yaml
+++ b/k8s/seaweedfs/values.yaml
@ -4,7 +4,7 @@ global:
  registry: ""
  repository: ""
  imageName: chrislusf/seaweedfs
-  # imageTag: "2.27" - started using {.Chart.appVersion}
+  # imageTag: "2.31" - started using {.Chart.appVersion}
  imagePullPolicy: IfNotPresent
  imagePullSecrets: imagepullsecret
  restartPolicy: Always
@ -138,6 +138,24 @@ volume:
  # minimum free disk space(in percents). If free disk space lower this value - all volumes marks as ReadOnly
  minFreeSpacePercent: 7

+# can use ANY storage-class , example with local-path-provisner
+#  data:
+#    type: "persistentVolumeClaim"
+#    size: "24Ti"
+#    storageClass: "local-path-provisioner"
+  data:
+    type: "hostPath"
+    size: ""
+    storageClass: ""
+  idx:
+    type: "hostPath"
+    size: ""
+    storageClass: ""
+
+  logs:
+    type: "hostPath"
+    size: ""
+    storageClass: ""

  # limit background compaction or copying speed in mega bytes per second
  compactionMBps: "50"
--- a/note/SeaweedFS_Architecture.png
+++ b/note/SeaweedFS_Architecture.png
--- a/note/SeaweedFS_Cluster_Backup.png
+++ b/note/SeaweedFS_Cluster_Backup.png
--- a/note/SeaweedFS_XDR.png
+++ b/note/SeaweedFS_XDR.png
--- 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>1.6.1</version>
+    <version>1.6.2</version>

    <parent>
        <groupId>org.sonatype.oss</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>1.6.1</version>
+    <version>1.6.2</version>

    <parent>
        <groupId>org.sonatype.oss</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>1.6.1</version>
+    <version>1.6.2</version>

    <parent>
        <groupId>org.sonatype.oss</groupId>
--- a/other/java/client/src/main/java/seaweedfs/client/SeaweedOutputStream.java
+++ b/other/java/client/src/main/java/seaweedfs/client/SeaweedOutputStream.java
@ -8,6 +8,7 @@ import org.slf4j.LoggerFactory;
 import java.io.IOException;
 import java.io.InterruptedIOException;
 import java.io.OutputStream;
+import java.nio.Buffer;
 import java.nio.ByteBuffer;
 import java.util.concurrent.*;

@ -217,7 +218,7 @@ public class SeaweedOutputStream extends OutputStream {

    private synchronized int submitWriteBufferToService(final ByteBuffer bufferToWrite, final long writePosition) throws IOException {

-        bufferToWrite.flip();
+        ((Buffer)bufferToWrite).flip();
        int bytesLength = bufferToWrite.limit() - bufferToWrite.position();

        if (threadExecutor.getQueue().size() >= maxConcurrentRequestCount) {
--- 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>1.6.1</version>
+            <version>1.6.2</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>com.github.chrislusf</groupId>
            <artifactId>seaweedfs-hadoop2-client</artifactId>
-            <version>1.6.1</version>
+            <version>1.6.2</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>1.6.1</seaweedfs.client.version>
+    <seaweedfs.client.version>1.6.2</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>1.6.1</seaweedfs.client.version>
+        <seaweedfs.client.version>1.6.2</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>1.6.1</seaweedfs.client.version>
+    <seaweedfs.client.version>1.6.2</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>1.6.1</seaweedfs.client.version>
+        <seaweedfs.client.version>1.6.2</seaweedfs.client.version>
        <hadoop.version>3.1.1</hadoop.version>
    </properties>

--- a/weed/Makefile
+++ b/weed/Makefile
@ -33,3 +33,7 @@ debug_webdav:
 debug_s3:
 	go build -gcflags="all=-N -l"
 	dlv --listen=:2345 --headless=true --api-version=2 --accept-multiclient exec weed -- -v=4 s3
+
+debug_filer_copy:
+	go build -gcflags="all=-N -l"
+	dlv --listen=:2345 --headless=true --api-version=2 --accept-multiclient exec weed -- -v=4 filer.backup -filer=localhost:8888 -filerProxy -timeAgo=10h
--- a/weed/command/benchmark.go
+++ b/weed/command/benchmark.go
@ -41,6 +41,7 @@ type BenchmarkOptions struct {
 	grpcDialOption   grpc.DialOption
 	masterClient     *wdclient.MasterClient
 	fsync            *bool
+	useTcp           *bool
 }

 var (
@ -67,6 +68,7 @@ func init() {
 	b.cpuprofile = cmdBenchmark.Flag.String("cpuprofile", "", "cpu profile output file")
 	b.maxCpu = cmdBenchmark.Flag.Int("maxCpu", 0, "maximum number of CPUs. 0 means all available CPUs")
 	b.fsync = cmdBenchmark.Flag.Bool("fsync", false, "flush data to disk after write")
+	b.useTcp = cmdBenchmark.Flag.Bool("useTcp", false, "send data via tcp")
 	sharedBytes = make([]byte, 1024)
 }

@ -223,6 +225,8 @@ func writeFiles(idChan chan int, fileIdLineChan chan string, s *stat) {

 	random := rand.New(rand.NewSource(time.Now().UnixNano()))

+	volumeTcpClient := wdclient.NewVolumeTcpClient()
+
 	for id := range idChan {
 		start := time.Now()
 		fileSize := int64(*b.fileSize + random.Intn(64))
@ -243,7 +247,15 @@ func writeFiles(idChan chan int, fileIdLineChan chan string, s *stat) {
 			if !isSecure && assignResult.Auth != "" {
 				isSecure = true
 			}
-			if _, err := fp.Upload(0, b.masterClient.GetMaster, false, assignResult.Auth, b.grpcDialOption); err == nil {
+			if *b.useTcp {
+				if uploadByTcp(volumeTcpClient, fp) {
+					fileIdLineChan <- fp.Fid
+					s.completed++
+					s.transferred += fileSize
+				} else {
+					s.failed++
+				}
+			} else if _, err := fp.Upload(0, b.masterClient.GetMaster, false, assignResult.Auth, b.grpcDialOption); err == nil {
 				if random.Intn(100) < *b.deletePercentage {
 					s.total++
 					delayedDeleteChan <- &delayedFile{time.Now().Add(time.Second), fp}
@ -329,6 +341,17 @@ func writeFileIds(fileName string, fileIdLineChan chan string, finishChan chan b
 	}
 }

+func uploadByTcp(volumeTcpClient *wdclient.VolumeTcpClient, fp *operation.FilePart) bool {
+
+	err := volumeTcpClient.PutFileChunk(fp.Server, fp.Fid, uint32(fp.FileSize), fp.Reader)
+	if err != nil {
+		glog.Errorf("upload chunk err: %v", err)
+		return false
+	}
+
+	return true
+}
+
 func readFileIds(fileName string, fileIdLineChan chan string) {
 	file, err := os.Open(fileName) // For read access.
 	if err != nil {
--- a/weed/command/command.go
+++ b/weed/command/command.go
@ -15,7 +15,9 @@ var Commands = []*Command{
 	cmdDownload,
 	cmdExport,
 	cmdFiler,
+	cmdFilerBackup,
 	cmdFilerCat,
+	cmdFilerMetaBackup,
 	cmdFilerMetaTail,
 	cmdFilerReplicate,
 	cmdFilerSynchronize,
--- a/weed/command/filer_backup.go
+++ b/weed/command/filer_backup.go
@ -0,0 +1,157 @@
+package command
+
+import (
+	"context"
+	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/replication/source"
+	"github.com/chrislusf/seaweedfs/weed/security"
+	"github.com/chrislusf/seaweedfs/weed/util"
+	"google.golang.org/grpc"
+	"io"
+	"time"
+)
+
+type FilerBackupOptions struct {
+	isActivePassive *bool
+	filer           *string
+	path            *string
+	debug           *bool
+	proxyByFiler    *bool
+	timeAgo         *time.Duration
+}
+
+var (
+	filerBackupOptions FilerBackupOptions
+)
+
+func init() {
+	cmdFilerBackup.Run = runFilerBackup // break init cycle
+	filerBackupOptions.filer = cmdFilerBackup.Flag.String("filer", "localhost:8888", "filer of one SeaweedFS cluster")
+	filerBackupOptions.path = cmdFilerBackup.Flag.String("filerPath", "/", "directory to sync on filer")
+	filerBackupOptions.proxyByFiler = cmdFilerBackup.Flag.Bool("filerProxy", false, "read and write file chunks by filer instead of volume servers")
+	filerBackupOptions.debug = cmdFilerBackup.Flag.Bool("debug", false, "debug mode to print out received files")
+	filerBackupOptions.timeAgo = cmdFilerBackup.Flag.Duration("timeAgo", 0, "start time before now. \"300ms\", \"1.5h\" or \"2h45m\". Valid time units are \"ns\", \"us\" (or \"µs\"), \"ms\", \"s\", \"m\", \"h\"")
+}
+
+var cmdFilerBackup = &Command{
+	UsageLine: "filer.backup -filer=<filerHost>:<filerPort> ",
+	Short:     "resume-able continuously replicate files from a SeaweedFS cluster to another location defined in replication.toml",
+	Long: `resume-able continuously replicate files from a SeaweedFS cluster to another location defined in replication.toml
+
+	filer.backup listens on filer notifications. If any file is updated, it will fetch the updated content,
+	and write to the destination. This is to replace filer.replicate command since additional message queue is not needed.
+
+	If restarted and "-timeAgo" is not set, the synchronization will resume from the previous checkpoints, persisted every minute.
+	A fresh sync will start from the earliest metadata logs. To reset the checkpoints, just set "-timeAgo" to a high value.
+
+`,
+}
+
+func runFilerBackup(cmd *Command, args []string) bool {
+
+	grpcDialOption := security.LoadClientTLS(util.GetViper(), "grpc.client")
+
+	util.LoadConfiguration("security", false)
+	util.LoadConfiguration("replication", true)
+
+	for {
+		err := doFilerBackup(grpcDialOption, &filerBackupOptions)
+		if err != nil {
+			glog.Errorf("backup from %s: %v", *filerBackupOptions.filer, err)
+			time.Sleep(1747 * time.Millisecond)
+		}
+	}
+
+	return true
+}
+
+const (
+	BackupKeyPrefix = "backup."
+)
+
+func doFilerBackup(grpcDialOption grpc.DialOption, backupOption *FilerBackupOptions) error {
+
+	// find data sink
+	config := util.GetViper()
+	dataSink := findSink(config)
+	if dataSink == nil {
+		return fmt.Errorf("no data sink configured in replication.toml")
+	}
+
+	sourceFiler := *backupOption.filer
+	sourcePath := *backupOption.path
+	timeAgo := *backupOption.timeAgo
+	targetPath := dataSink.GetSinkToDirectory()
+	debug := *backupOption.debug
+
+	// get start time for the data sink
+	startFrom := time.Unix(0, 0)
+	sinkId := util.HashStringToLong(dataSink.GetName() + dataSink.GetSinkToDirectory())
+	if timeAgo.Milliseconds() == 0 {
+		lastOffsetTsNs, err := getOffset(grpcDialOption, sourceFiler, BackupKeyPrefix, int32(sinkId))
+		if err != nil {
+			glog.V(0).Infof("starting from %v", startFrom)
+		} else {
+			startFrom = time.Unix(0, lastOffsetTsNs)
+			glog.V(0).Infof("resuming from %v", startFrom)
+		}
+	} else {
+		startFrom = time.Now().Add(-timeAgo)
+		glog.V(0).Infof("start time is set to %v", startFrom)
+	}
+
+	// create filer sink
+	filerSource := &source.FilerSource{}
+	filerSource.DoInitialize(sourceFiler, pb.ServerToGrpcAddress(sourceFiler), sourcePath, *backupOption.proxyByFiler)
+	dataSink.SetSourceFiler(filerSource)
+
+	processEventFn := genProcessFunction(sourcePath, targetPath, dataSink, debug)
+
+	return pb.WithFilerClient(sourceFiler, grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
+
+		ctx, cancel := context.WithCancel(context.Background())
+		defer cancel()
+
+		stream, err := client.SubscribeMetadata(ctx, &filer_pb.SubscribeMetadataRequest{
+			ClientName: "backup_" + dataSink.GetName(),
+			PathPrefix: sourcePath,
+			SinceNs:    startFrom.UnixNano(),
+		})
+		if err != nil {
+			return fmt.Errorf("listen: %v", err)
+		}
+
+		var counter int64
+		var lastWriteTime time.Time
+		for {
+			resp, listenErr := stream.Recv()
+
+			if listenErr == io.EOF {
+				return nil
+			}
+			if listenErr != nil {
+				return listenErr
+			}
+
+			if err := processEventFn(resp); err != nil {
+				return fmt.Errorf("processEventFn: %v", err)
+			}
+
+			counter++
+			if lastWriteTime.Add(3 * time.Second).Before(time.Now()) {
+				glog.V(0).Infof("backup %s progressed to %v %0.2f/sec", sourceFiler, time.Unix(0, resp.TsNs), float64(counter)/float64(3))
+				counter = 0
+				lastWriteTime = time.Now()
+				if err := setOffset(grpcDialOption, sourceFiler, BackupKeyPrefix, int32(sinkId), resp.TsNs); err != nil {
+					return fmt.Errorf("setOffset: %v", err)
+				}
+			}
+
+		}
+
+	})
+
+}
--- a/weed/command/filer_meta_backup.go
+++ b/weed/command/filer_meta_backup.go
@ -0,0 +1,268 @@
+package command
+
+import (
+	"context"
+	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/filer"
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/spf13/viper"
+	"google.golang.org/grpc"
+	"io"
+	"reflect"
+	"time"
+
+	"github.com/chrislusf/seaweedfs/weed/pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/security"
+	"github.com/chrislusf/seaweedfs/weed/util"
+)
+
+var (
+	metaBackup FilerMetaBackupOptions
+)
+
+type FilerMetaBackupOptions struct {
+	grpcDialOption    grpc.DialOption
+	filerAddress      *string
+	filerDirectory    *string
+	restart           *bool
+	backupFilerConfig *string
+
+	store filer.FilerStore
+}
+
+func init() {
+	cmdFilerMetaBackup.Run = runFilerMetaBackup // break init cycle
+	metaBackup.filerAddress = cmdFilerMetaBackup.Flag.String("filer", "localhost:8888", "filer hostname:port")
+	metaBackup.filerDirectory = cmdFilerMetaBackup.Flag.String("filerDir", "/", "a folder on the filer")
+	metaBackup.restart = cmdFilerMetaBackup.Flag.Bool("restart", false, "copy the full metadata before async incremental backup")
+	metaBackup.backupFilerConfig = cmdFilerMetaBackup.Flag.String("config", "", "path to filer.toml specifying backup filer store")
+}
+
+var cmdFilerMetaBackup = &Command{
+	UsageLine: "filer.meta.backup [-filer=localhost:8888] [-filerDir=/] [-restart] -config=/path/to/backup_filer.toml",
+	Short:     "continuously backup filer meta data changes to anther filer store specified in a backup_filer.toml",
+	Long: `continuously backup filer meta data changes. 
+The backup writes to another filer store specified in a backup_filer.toml.
+
+	weed filer.meta.backup -config=/path/to/backup_filer.toml -filer="localhost:8888"
+	weed filer.meta.backup -config=/path/to/backup_filer.toml -filer="localhost:8888" -restart
+
+  `,
+}
+
+func runFilerMetaBackup(cmd *Command, args []string) bool {
+
+	metaBackup.grpcDialOption = security.LoadClientTLS(util.GetViper(), "grpc.client")
+
+	// load backup_filer.toml
+	v := viper.New()
+	v.SetConfigFile(*metaBackup.backupFilerConfig)
+
+	if err := v.ReadInConfig(); err != nil { // Handle errors reading the config file
+		glog.Fatalf("Failed to load %s file.\nPlease use this command to generate the a %s.toml file\n"+
+			"    weed scaffold -config=%s -output=.\n\n\n",
+			*metaBackup.backupFilerConfig, "backup_filer", "filer")
+	}
+
+	if err := metaBackup.initStore(v); err != nil {
+		glog.V(0).Infof("init backup filer store: %v", err)
+		return true
+	}
+
+	missingPreviousBackup := false
+	_, err := metaBackup.getOffset()
+	if err != nil {
+		missingPreviousBackup = true
+	}
+
+	if *metaBackup.restart || missingPreviousBackup {
+		glog.V(0).Infof("traversing metadata tree...")
+		startTime := time.Now()
+		if err := metaBackup.traverseMetadata(); err != nil {
+			glog.Errorf("traverse meta data: %v", err)
+			return true
+		}
+		glog.V(0).Infof("metadata copied up to %v", startTime)
+		if err := metaBackup.setOffset(startTime); err != nil {
+			startTime = time.Now()
+		}
+	}
+
+	for {
+		err := metaBackup.streamMetadataBackup()
+		if err != nil {
+			glog.Errorf("filer meta backup from %s: %v", *metaBackup.filerAddress, err)
+			time.Sleep(1747 * time.Millisecond)
+		}
+	}
+
+	return true
+}
+
+func (metaBackup *FilerMetaBackupOptions) initStore(v *viper.Viper) error {
+	// load configuration for default filer store
+	hasDefaultStoreConfigured := false
+	for _, store := range filer.Stores {
+		if v.GetBool(store.GetName() + ".enabled") {
+			store = reflect.New(reflect.ValueOf(store).Elem().Type()).Interface().(filer.FilerStore)
+			if err := store.Initialize(v, store.GetName()+"."); err != nil {
+				glog.Fatalf("failed to initialize store for %s: %+v", store.GetName(), err)
+			}
+			glog.V(0).Infof("configured filer store to %s", store.GetName())
+			hasDefaultStoreConfigured = true
+			metaBackup.store = filer.NewFilerStoreWrapper(store)
+			break
+		}
+	}
+	if !hasDefaultStoreConfigured {
+		return fmt.Errorf("no filer store enabled in %s", v.ConfigFileUsed())
+	}
+
+	return nil
+}
+
+func (metaBackup *FilerMetaBackupOptions) traverseMetadata() (err error) {
+	var saveErr error
+
+	traverseErr := filer_pb.TraverseBfs(metaBackup, util.FullPath(*metaBackup.filerDirectory), func(parentPath util.FullPath, entry *filer_pb.Entry) {
+
+		println("+", parentPath.Child(entry.Name))
+		if err := metaBackup.store.InsertEntry(context.Background(), filer.FromPbEntry(string(parentPath), entry)); err != nil {
+			saveErr = fmt.Errorf("insert entry error: %v\n", err)
+			return
+		}
+
+	})
+
+	if traverseErr != nil {
+		return fmt.Errorf("traverse: %v", traverseErr)
+	}
+	return saveErr
+}
+
+var (
+	MetaBackupKey = []byte("metaBackup")
+)
+
+func (metaBackup *FilerMetaBackupOptions) streamMetadataBackup() error {
+
+	startTime, err := metaBackup.getOffset()
+	if err != nil {
+		startTime = time.Now()
+	}
+	glog.V(0).Infof("streaming from %v", startTime)
+
+	store := metaBackup.store
+
+	eachEntryFunc := func(resp *filer_pb.SubscribeMetadataResponse) error {
+
+		ctx := context.Background()
+		message := resp.EventNotification
+
+		if message.OldEntry == nil && message.NewEntry == nil {
+			return nil
+		}
+		if message.OldEntry == nil && message.NewEntry != nil {
+			println("+", util.FullPath(message.NewParentPath).Child(message.NewEntry.Name))
+			entry := filer.FromPbEntry(message.NewParentPath, message.NewEntry)
+			return store.InsertEntry(ctx, entry)
+		}
+		if message.OldEntry != nil && message.NewEntry == nil {
+			println("-", util.FullPath(resp.Directory).Child(message.OldEntry.Name))
+			return store.DeleteEntry(ctx, util.FullPath(resp.Directory).Child(message.OldEntry.Name))
+		}
+		if message.OldEntry != nil && message.NewEntry != nil {
+			if resp.Directory == message.NewParentPath && message.OldEntry.Name == message.NewEntry.Name {
+				println("~", util.FullPath(message.NewParentPath).Child(message.NewEntry.Name))
+				entry := filer.FromPbEntry(message.NewParentPath, message.NewEntry)
+				return store.UpdateEntry(ctx, entry)
+			}
+			println("-", util.FullPath(resp.Directory).Child(message.OldEntry.Name))
+			if err := store.DeleteEntry(ctx, util.FullPath(resp.Directory).Child(message.OldEntry.Name)); err != nil {
+				return err
+			}
+			println("+", util.FullPath(message.NewParentPath).Child(message.NewEntry.Name))
+			return store.InsertEntry(ctx, filer.FromPbEntry(message.NewParentPath, message.NewEntry))
+		}
+
+		return nil
+	}
+
+	tailErr := pb.WithFilerClient(*metaBackup.filerAddress, metaBackup.grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
+
+		ctx, cancel := context.WithCancel(context.Background())
+		defer cancel()
+
+		stream, err := client.SubscribeMetadata(ctx, &filer_pb.SubscribeMetadataRequest{
+			ClientName: "meta_backup",
+			PathPrefix: *metaBackup.filerDirectory,
+			SinceNs:    startTime.UnixNano(),
+		})
+		if err != nil {
+			return fmt.Errorf("listen: %v", err)
+		}
+
+		var counter int64
+		var lastWriteTime time.Time
+		for {
+			resp, listenErr := stream.Recv()
+			if listenErr == io.EOF {
+				return nil
+			}
+			if listenErr != nil {
+				return listenErr
+			}
+			if err = eachEntryFunc(resp); err != nil {
+				return err
+			}
+
+			counter++
+			if lastWriteTime.Add(3 * time.Second).Before(time.Now()) {
+				glog.V(0).Infof("meta backup %s progressed to %v %0.2f/sec", *metaBackup.filerAddress, time.Unix(0, resp.TsNs), float64(counter)/float64(3))
+				counter = 0
+				lastWriteTime = time.Now()
+				if err2 := metaBackup.setOffset(lastWriteTime); err2 != nil {
+					return err2
+				}
+			}
+
+		}
+
+	})
+	return tailErr
+}
+
+func (metaBackup *FilerMetaBackupOptions) getOffset() (lastWriteTime time.Time, err error) {
+	value, err := metaBackup.store.KvGet(context.Background(), MetaBackupKey)
+	if err != nil {
+		return
+	}
+	tsNs := util.BytesToUint64(value)
+
+	return time.Unix(0, int64(tsNs)), nil
+}
+
+func (metaBackup *FilerMetaBackupOptions) setOffset(lastWriteTime time.Time) error {
+	valueBuf := make([]byte, 8)
+	util.Uint64toBytes(valueBuf, uint64(lastWriteTime.UnixNano()))
+
+	if err := metaBackup.store.KvPut(context.Background(), MetaBackupKey, valueBuf); err != nil {
+		return err
+	}
+	return nil
+}
+
+var _ = filer_pb.FilerClient(&FilerMetaBackupOptions{})
+
+func (metaBackup *FilerMetaBackupOptions) WithFilerClient(fn func(filer_pb.SeaweedFilerClient) error) error {
+
+	return pb.WithFilerClient(*metaBackup.filerAddress, metaBackup.grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
+		return fn(client)
+	})
+
+}
+
+func (metaBackup *FilerMetaBackupOptions) AdjustedUrl(location *filer_pb.Location) string {
+	return location.Url
+}
--- a/weed/command/filer_meta_tail.go
+++ b/weed/command/filer_meta_tail.go
@ -23,9 +23,9 @@ func init() {
 }

 var cmdFilerMetaTail = &Command{
-	UsageLine: "filer.meta.tail [-filer=localhost:8888] [-target=/]",
-	Short:     "see recent changes on a filer",
-	Long: `See recent changes on a filer.
+	UsageLine: "filer.meta.tail [-filer=localhost:8888] [-pathPrefix=/]",
+	Short:     "see continuous changes on a filer",
+	Long: `See continuous changes on a filer.

 	weed filer.meta.tail -timeAgo=30h | grep truncate
 	weed filer.meta.tail -timeAgo=30h | jq .
@ -36,7 +36,7 @@ var cmdFilerMetaTail = &Command{

 var (
 	tailFiler   = cmdFilerMetaTail.Flag.String("filer", "localhost:8888", "filer hostname:port")
-	tailTarget  = cmdFilerMetaTail.Flag.String("pathPrefix", "/", "path to a folder or file, or common prefix for the folders or files on filer")
+	tailTarget  = cmdFilerMetaTail.Flag.String("pathPrefix", "/", "path to a folder or common prefix for the folders or files on filer")
 	tailStart   = cmdFilerMetaTail.Flag.Duration("timeAgo", 0, "start time before now. \"300ms\", \"1.5h\" or \"2h45m\". Valid time units are \"ns\", \"us\" (or \"µs\"), \"ms\", \"s\", \"m\", \"h\"")
 	tailPattern = cmdFilerMetaTail.Flag.String("pattern", "", "full path or just filename pattern, ex: \"/home/?opher\", \"*.pdf\", see https://golang.org/pkg/path/filepath/#Match ")
 	esServers   = cmdFilerMetaTail.Flag.String("es", "", "comma-separated elastic servers http://<host:port>")
--- a/weed/command/filer_replication.go
+++ b/weed/command/filer_replication.go
@ -74,18 +74,7 @@ func runFilerReplicate(cmd *Command, args []string) bool {
 		}
 	}

-	var dataSink sink.ReplicationSink
-	for _, sk := range sink.Sinks {
-		if config.GetBool("sink." + sk.GetName() + ".enabled") {
-			if err := sk.Initialize(config, "sink."+sk.GetName()+"."); err != nil {
-				glog.Fatalf("Failed to initialize sink for %s: %+v",
-					sk.GetName(), err)
-			}
-			glog.V(0).Infof("Configure sink to %s", sk.GetName())
-			dataSink = sk
-			break
-		}
-	}
+	dataSink := findSink(config)

 	if dataSink == nil {
 		println("no data sink configured in replication.toml:")
@ -135,6 +124,22 @@ func runFilerReplicate(cmd *Command, args []string) bool {

 }

+func findSink(config *util.ViperProxy) sink.ReplicationSink {
+	var dataSink sink.ReplicationSink
+	for _, sk := range sink.Sinks {
+		if config.GetBool("sink." + sk.GetName() + ".enabled") {
+			if err := sk.Initialize(config, "sink."+sk.GetName()+"."); err != nil {
+				glog.Fatalf("Failed to initialize sink for %s: %+v",
+					sk.GetName(), err)
+			}
+			glog.V(0).Infof("Configure sink to %s", sk.GetName())
+			dataSink = sk
+			break
+		}
+	}
+	return dataSink
+}
+
 func validateOneEnabledInput(config *util.ViperProxy) {
 	enabledInput := ""
 	for _, input := range sub.NotificationInputs {
--- a/weed/command/filer_sync.go
+++ b/weed/command/filer_sync.go
@ -8,6 +8,7 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/pb"
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
 	"github.com/chrislusf/seaweedfs/weed/replication"
+	"github.com/chrislusf/seaweedfs/weed/replication/sink"
 	"github.com/chrislusf/seaweedfs/weed/replication/sink/filersink"
 	"github.com/chrislusf/seaweedfs/weed/replication/source"
 	"github.com/chrislusf/seaweedfs/weed/security"
@ -137,7 +138,7 @@ func doSubscribeFilerMetaChanges(grpcDialOption grpc.DialOption, sourceFiler, so

 	// if first time, start from now
 	// if has previously synced, resume from that point of time
-	sourceFilerOffsetTsNs, err := readSyncOffset(grpcDialOption, targetFiler, sourceFilerSignature)
+	sourceFilerOffsetTsNs, err := getOffset(grpcDialOption, targetFiler, SyncKeyPrefix, sourceFilerSignature)
 	if err != nil {
 		return err
 	}
@ -151,93 +152,17 @@ func doSubscribeFilerMetaChanges(grpcDialOption grpc.DialOption, sourceFiler, so
 	filerSink.DoInitialize(targetFiler, pb.ServerToGrpcAddress(targetFiler), targetPath, replicationStr, collection, ttlSec, diskType, grpcDialOption, sinkWriteChunkByFiler)
 	filerSink.SetSourceFiler(filerSource)

+	persistEventFn := genProcessFunction(sourcePath, targetPath, filerSink, debug)
+
 	processEventFn := func(resp *filer_pb.SubscribeMetadataResponse) error {
 		message := resp.EventNotification
-
-		var sourceOldKey, sourceNewKey util.FullPath
-		if message.OldEntry != nil {
-			sourceOldKey = util.FullPath(resp.Directory).Child(message.OldEntry.Name)
-		}
-		if message.NewEntry != nil {
-			sourceNewKey = util.FullPath(message.NewParentPath).Child(message.NewEntry.Name)
-		}
-
 		for _, sig := range message.Signatures {
 			if sig == targetFilerSignature && targetFilerSignature != 0 {
 				fmt.Printf("%s skipping %s change to %v\n", targetFiler, sourceFiler, message)
 				return nil
 			}
 		}
-		if debug {
-			fmt.Printf("%s check %s change %s,%s sig %v, target sig: %v\n", targetFiler, sourceFiler, sourceOldKey, sourceNewKey, message.Signatures, targetFilerSignature)
-		}
-
-		if !strings.HasPrefix(resp.Directory, sourcePath) {
-			return nil
-		}
-
-		// handle deletions
-		if message.OldEntry != nil && message.NewEntry == nil {
-			if !strings.HasPrefix(string(sourceOldKey), sourcePath) {
-				return nil
-			}
-			key := util.Join(targetPath, string(sourceOldKey)[len(sourcePath):])
-			return filerSink.DeleteEntry(key, message.OldEntry.IsDirectory, message.DeleteChunks, message.Signatures)
-		}
-
-		// handle new entries
-		if message.OldEntry == nil && message.NewEntry != nil {
-			if !strings.HasPrefix(string(sourceNewKey), sourcePath) {
-				return nil
-			}
-			key := util.Join(targetPath, string(sourceNewKey)[len(sourcePath):])
-			return filerSink.CreateEntry(key, message.NewEntry, message.Signatures)
-		}
-
-		// this is something special?
-		if message.OldEntry == nil && message.NewEntry == nil {
-			return nil
-		}
-
-		// handle updates
-		if strings.HasPrefix(string(sourceOldKey), sourcePath) {
-			// old key is in the watched directory
-			if strings.HasPrefix(string(sourceNewKey), sourcePath) {
-				// new key is also in the watched directory
-				oldKey := util.Join(targetPath, string(sourceOldKey)[len(sourcePath):])
-				message.NewParentPath = util.Join(targetPath, message.NewParentPath[len(sourcePath):])
-				foundExisting, err := filerSink.UpdateEntry(string(oldKey), message.OldEntry, message.NewParentPath, message.NewEntry, message.DeleteChunks, message.Signatures)
-				if foundExisting {
-					return err
-				}
-
-				// not able to find old entry
-				if err = filerSink.DeleteEntry(string(oldKey), message.OldEntry.IsDirectory, false, message.Signatures); err != nil {
-					return fmt.Errorf("delete old entry %v: %v", oldKey, err)
-				}
-
-				// create the new entry
-				newKey := util.Join(targetPath, string(sourceNewKey)[len(sourcePath):])
-				return filerSink.CreateEntry(newKey, message.NewEntry, message.Signatures)
-
-			} else {
-				// new key is outside of the watched directory
-				key := util.Join(targetPath, string(sourceOldKey)[len(sourcePath):])
-				return filerSink.DeleteEntry(key, message.OldEntry.IsDirectory, message.DeleteChunks, message.Signatures)
-			}
-		} else {
-			// old key is outside of the watched directory
-			if strings.HasPrefix(string(sourceNewKey), sourcePath) {
-				// new key is in the watched directory
-				key := util.Join(targetPath, string(sourceNewKey)[len(sourcePath):])
-				return filerSink.CreateEntry(key, message.NewEntry, message.Signatures)
-			} else {
-				// new key is also outside of the watched directory
-				// skip
-			}
-		}
-
-		return nil
+		return persistEventFn(resp)
 	}

 	return pb.WithFilerClient(sourceFiler, grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
@ -275,7 +200,7 @@ func doSubscribeFilerMetaChanges(grpcDialOption grpc.DialOption, sourceFiler, so
 				glog.V(0).Infof("sync %s => %s progressed to %v %0.2f/sec", sourceFiler, targetFiler, time.Unix(0, resp.TsNs), float64(counter)/float64(3))
 				counter = 0
 				lastWriteTime = time.Now()
-				if err := writeSyncOffset(grpcDialOption, targetFiler, sourceFilerSignature, resp.TsNs); err != nil {
+				if err := setOffset(grpcDialOption, targetFiler, SyncKeyPrefix, sourceFilerSignature, resp.TsNs); err != nil {
 					return err
 				}
 			}
@ -290,11 +215,11 @@ const (
 	SyncKeyPrefix = "sync."
 )

-func readSyncOffset(grpcDialOption grpc.DialOption, filer string, filerSignature int32) (lastOffsetTsNs int64, readErr error) {
+func getOffset(grpcDialOption grpc.DialOption, filer string, signaturePrefix string, signature int32) (lastOffsetTsNs int64, readErr error) {

 	readErr = pb.WithFilerClient(filer, grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
-		syncKey := []byte(SyncKeyPrefix + "____")
-		util.Uint32toBytes(syncKey[len(SyncKeyPrefix):len(SyncKeyPrefix)+4], uint32(filerSignature))
+		syncKey := []byte(signaturePrefix + "____")
+		util.Uint32toBytes(syncKey[len(signaturePrefix):len(signaturePrefix)+4], uint32(signature))

 		resp, err := client.KvGet(context.Background(), &filer_pb.KvGetRequest{Key: syncKey})
 		if err != nil {
@ -317,11 +242,11 @@ func readSyncOffset(grpcDialOption grpc.DialOption, filer string, filerSignature

 }

-func writeSyncOffset(grpcDialOption grpc.DialOption, filer string, filerSignature int32, offsetTsNs int64) error {
+func setOffset(grpcDialOption grpc.DialOption, filer string, signaturePrefix string, signature int32, offsetTsNs int64) error {
 	return pb.WithFilerClient(filer, grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {

-		syncKey := []byte(SyncKeyPrefix + "____")
-		util.Uint32toBytes(syncKey[len(SyncKeyPrefix):len(SyncKeyPrefix)+4], uint32(filerSignature))
+		syncKey := []byte(signaturePrefix + "____")
+		util.Uint32toBytes(syncKey[len(signaturePrefix):len(signaturePrefix)+4], uint32(signature))

 		valueBuf := make([]byte, 8)
 		util.Uint64toBytes(valueBuf, uint64(offsetTsNs))
@ -343,3 +268,107 @@ func writeSyncOffset(grpcDialOption grpc.DialOption, filer string, filerSignatur
 	})

 }
+
+func genProcessFunction(sourcePath string, targetPath string, dataSink sink.ReplicationSink, debug bool) func(resp *filer_pb.SubscribeMetadataResponse) error {
+	// process function
+	processEventFn := func(resp *filer_pb.SubscribeMetadataResponse) error {
+		message := resp.EventNotification
+
+		var sourceOldKey, sourceNewKey util.FullPath
+		if message.OldEntry != nil {
+			sourceOldKey = util.FullPath(resp.Directory).Child(message.OldEntry.Name)
+		}
+		if message.NewEntry != nil {
+			sourceNewKey = util.FullPath(message.NewParentPath).Child(message.NewEntry.Name)
+		}
+
+		if debug {
+			glog.V(0).Infof("received %v", resp)
+		}
+
+		if !strings.HasPrefix(resp.Directory, sourcePath) {
+			return nil
+		}
+
+		// handle deletions
+		if message.OldEntry != nil && message.NewEntry == nil {
+			if !strings.HasPrefix(string(sourceOldKey), sourcePath) {
+				return nil
+			}
+			key := buildKey(dataSink, message, targetPath, sourceOldKey, sourcePath)
+			return dataSink.DeleteEntry(key, message.OldEntry.IsDirectory, message.DeleteChunks, message.Signatures)
+		}
+
+		// handle new entries
+		if message.OldEntry == nil && message.NewEntry != nil {
+			if !strings.HasPrefix(string(sourceNewKey), sourcePath) {
+				return nil
+			}
+			key := buildKey(dataSink, message, targetPath, sourceNewKey, sourcePath)
+			return dataSink.CreateEntry(key, message.NewEntry, message.Signatures)
+		}
+
+		// this is something special?
+		if message.OldEntry == nil && message.NewEntry == nil {
+			return nil
+		}
+
+		// handle updates
+		if strings.HasPrefix(string(sourceOldKey), sourcePath) {
+			// old key is in the watched directory
+			if strings.HasPrefix(string(sourceNewKey), sourcePath) {
+				// new key is also in the watched directory
+				if !dataSink.IsIncremental() {
+					oldKey := util.Join(targetPath, string(sourceOldKey)[len(sourcePath):])
+					message.NewParentPath = util.Join(targetPath, message.NewParentPath[len(sourcePath):])
+					foundExisting, err := dataSink.UpdateEntry(string(oldKey), message.OldEntry, message.NewParentPath, message.NewEntry, message.DeleteChunks, message.Signatures)
+					if foundExisting {
+						return err
+					}
+
+					// not able to find old entry
+					if err = dataSink.DeleteEntry(string(oldKey), message.OldEntry.IsDirectory, false, message.Signatures); err != nil {
+						return fmt.Errorf("delete old entry %v: %v", oldKey, err)
+					}
+				}
+				// create the new entry
+				newKey := buildKey(dataSink, message, targetPath, sourceNewKey, sourcePath)
+				return dataSink.CreateEntry(newKey, message.NewEntry, message.Signatures)
+
+			} else {
+				// new key is outside of the watched directory
+				if !dataSink.IsIncremental() {
+					key := buildKey(dataSink, message, targetPath, sourceOldKey, sourcePath)
+					return dataSink.DeleteEntry(key, message.OldEntry.IsDirectory, message.DeleteChunks, message.Signatures)
+				}
+			}
+		} else {
+			// old key is outside of the watched directory
+			if strings.HasPrefix(string(sourceNewKey), sourcePath) {
+				// new key is in the watched directory
+				key := buildKey(dataSink, message, targetPath, sourceNewKey, sourcePath)
+				return dataSink.CreateEntry(key, message.NewEntry, message.Signatures)
+			} else {
+				// new key is also outside of the watched directory
+				// skip
+			}
+		}
+
+		return nil
+	}
+	return processEventFn
+}
+
+func buildKey(dataSink sink.ReplicationSink, message *filer_pb.EventNotification, targetPath string, sourceKey util.FullPath, sourcePath string) string {
+	if !dataSink.IsIncremental() {
+		return util.Join(targetPath, string(sourceKey)[len(sourcePath):])
+	}
+	var mTime int64
+	if message.NewEntry != nil {
+		mTime = message.NewEntry.Attributes.Mtime
+	} else if message.OldEntry != nil {
+		mTime = message.OldEntry.Attributes.Mtime
+	}
+	dateKey := time.Unix(mTime, 0).Format("2006-01-02")
+	return util.Join(targetPath, dateKey, string(sourceKey)[len(sourcePath):])
+}
--- a/weed/command/master.go
+++ b/weed/command/master.go
@ -138,7 +138,6 @@ func startMaster(masterOption MasterOptions, masterWhiteList []string) {
 	if err != nil {
 		glog.Fatalf("master failed to listen on grpc port %d: %v", grpcPort, err)
 	}
-	// Create your protocol servers.
 	grpcS := pb.NewGrpcServer(security.LoadServerTLS(util.GetViper(), "grpc.master"))
 	master_pb.RegisterSeaweedServer(grpcS, ms)
 	protobuf.RegisterRaftServer(grpcS, raftServer)
--- a/weed/command/mount_std.go
+++ b/weed/command/mount_std.go
@ -53,7 +53,7 @@ func RunMount(option *MountOptions, umask os.FileMode) bool {

 	filer := *option.filer
 	// parse filer grpc address
-	filerGrpcAddress, err := pb.ParseFilerGrpcAddress(filer)
+	filerGrpcAddress, err := pb.ParseServerToGrpcAddress(filer)
 	if err != nil {
 		glog.V(0).Infof("ParseFilerGrpcAddress: %v", err)
 		return true
@ -63,16 +63,23 @@ func RunMount(option *MountOptions, umask os.FileMode) bool {
 	// try to connect to filer, filerBucketsPath may be useful later
 	grpcDialOption := security.LoadClientTLS(util.GetViper(), "grpc.client")
 	var cipher bool
-	err = pb.WithGrpcFilerClient(filerGrpcAddress, grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
-		resp, err := client.GetFilerConfiguration(context.Background(), &filer_pb.GetFilerConfigurationRequest{})
+	for i := 0; i < 10; i++ {
+		err = pb.WithGrpcFilerClient(filerGrpcAddress, grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
+			resp, err := client.GetFilerConfiguration(context.Background(), &filer_pb.GetFilerConfigurationRequest{})
+			if err != nil {
+				return fmt.Errorf("get filer grpc address %s configuration: %v", filerGrpcAddress, err)
+			}
+			cipher = resp.Cipher
+			return nil
+		})
 		if err != nil {
-			return fmt.Errorf("get filer grpc address %s configuration: %v", filerGrpcAddress, err)
+			glog.V(0).Infof("failed to talk to filer %s: %v", filerGrpcAddress, err)
+			glog.V(0).Infof("wait for %d seconds ...", i+1)
+			time.Sleep(time.Duration(i+1)*time.Second)
 		}
-		cipher = resp.Cipher
-		return nil
-	})
+	}
 	if err != nil {
-		glog.Infof("failed to talk to filer %s: %v", filerGrpcAddress, err)
+		glog.Errorf("failed to talk to filer %s: %v", filerGrpcAddress, err)
 		return true
 	}

--- a/weed/command/msg_broker.go
+++ b/weed/command/msg_broker.go
@ -63,7 +63,7 @@ func (msgBrokerOpt *MessageBrokerOptions) startQueueServer() bool {

 	grace.SetupProfiling(*messageBrokerStandaloneOptions.cpuprofile, *messageBrokerStandaloneOptions.memprofile)

-	filerGrpcAddress, err := pb.ParseFilerGrpcAddress(*msgBrokerOpt.filer)
+	filerGrpcAddress, err := pb.ParseServerToGrpcAddress(*msgBrokerOpt.filer)
 	if err != nil {
 		glog.Fatal(err)
 		return false
--- a/weed/command/s3.go
+++ b/weed/command/s3.go
@ -137,7 +137,7 @@ func runS3(cmd *Command, args []string) bool {

 func (s3opt *S3Options) startS3Server() bool {

-	filerGrpcAddress, err := pb.ParseFilerGrpcAddress(*s3opt.filer)
+	filerGrpcAddress, err := pb.ParseServerToGrpcAddress(*s3opt.filer)
 	if err != nil {
 		glog.Fatal(err)
 		return false
--- a/weed/command/scaffold.go
+++ b/weed/command/scaffold.go
@ -356,6 +356,9 @@ directory = "/buckets"
 [sink.local]
 enabled = false
 directory = "/data"
+# all replicated files are under modified time as yyyy-mm-dd directories
+# so each date directory contains all new and updated files.
+is_incremental = false

 [sink.local_incremental]
 # all replicated files are under modified time as yyyy-mm-dd directories
@ -373,6 +376,7 @@ directory = "/backup"
 replication = ""
 collection = ""
 ttlSec = 0
+is_incremental = false

 [sink.s3]
 # read credentials doc at https://docs.aws.amazon.com/sdk-for-go/v1/developer-guide/sessions.html
@ -384,6 +388,7 @@ region = "us-east-2"
 bucket = "your_bucket_name"    # an existing bucket
 directory = "/"                # destination directory
 endpoint = ""
+is_incremental = false

 [sink.google_cloud_storage]
 # read credentials doc at https://cloud.google.com/docs/authentication/getting-started
@ -391,6 +396,7 @@ enabled = false
 google_application_credentials = "/path/to/x.json" # path to json credential file
 bucket = "your_bucket_seaweedfs"    # an existing bucket
 directory = "/"                     # destination directory
+is_incremental = false

 [sink.azure]
 # experimental, let me know if it works
@ -399,6 +405,7 @@ account_name = ""
 account_key  = ""
 container = "mycontainer"      # an existing container
 directory = "/"                # destination directory
+is_incremental = false

 [sink.backblaze]
 enabled = false
@ -406,6 +413,7 @@ b2_account_id = ""
 b2_master_application_key  = ""
 bucket = "mybucket"            # an existing bucket
 directory = "/"                # destination directory
+is_incremental = false

 `

@ -432,22 +440,28 @@ expires_after_seconds = 10           # seconds
 # the host name is not checked, so the PERM files can be shared.
 [grpc]
 ca = ""
+# Set wildcard domain for enable TLS authentication by common names
+allowed_wildcard_domain = "" # .mycompany.com

 [grpc.volume]
 cert = ""
 key  = ""
+allowed_commonNames = ""	# comma-separated SSL certificate common names

 [grpc.master]
 cert = ""
 key  = ""
+allowed_commonNames = ""	# comma-separated SSL certificate common names

 [grpc.filer]
 cert = ""
 key  = ""
+allowed_commonNames = ""	# comma-separated SSL certificate common names

 [grpc.msg_broker]
 cert = ""
 key  = ""
+allowed_commonNames = ""	# comma-separated SSL certificate common names

 # use this for any place needs a grpc client
 # i.e., "weed backup|benchmark|filer.copy|filer.replicate|mount|s3|upload"
@ -455,7 +469,6 @@ key  = ""
 cert = ""
 key  = ""

-
 # volume server https options
 # Note: work in progress!
 #     this does not work with other clients, e.g., "weed filer|mount" etc, yet.
--- a/weed/command/server.go
+++ b/weed/command/server.go
@ -111,6 +111,7 @@ func init() {
 	serverOptions.v.preStopSeconds = cmdServer.Flag.Int("volume.preStopSeconds", 10, "number of seconds between stop send heartbeats and stop volume server")
 	serverOptions.v.pprof = cmdServer.Flag.Bool("volume.pprof", false, "enable pprof http handlers. precludes --memprofile and --cpuprofile")
 	serverOptions.v.idxFolder = cmdServer.Flag.String("volume.dir.idx", "", "directory to store .idx files")
+	serverOptions.v.enableTcp = cmdServer.Flag.Bool("volume.tcp", false, "<exprimental> enable tcp port")

 	s3Options.port = cmdServer.Flag.Int("s3.port", 8333, "s3 server http listen port")
 	s3Options.domainName = cmdServer.Flag.String("s3.domainName", "", "suffix of the host name in comma separated list, {bucket}.{domainName}")
@ -156,19 +157,21 @@ func runServer(cmd *Command, args []string) bool {
 		*isStartingFiler = true
 	}

-	_, peerList := checkPeers(*serverIp, *masterOptions.port, *masterOptions.peers)
-	peers := strings.Join(peerList, ",")
-	masterOptions.peers = &peers
+	if *isStartingMasterServer {
+		_, peerList := checkPeers(*serverIp, *masterOptions.port, *masterOptions.peers)
+		peers := strings.Join(peerList, ",")
+		masterOptions.peers = &peers
+	}

 	// ip address
 	masterOptions.ip = serverIp
 	masterOptions.ipBind = serverBindIp
-	filerOptions.masters = &peers
+	filerOptions.masters = masterOptions.peers
 	filerOptions.ip = serverIp
 	filerOptions.bindIp = serverBindIp
 	serverOptions.v.ip = serverIp
 	serverOptions.v.bindIp = serverBindIp
-	serverOptions.v.masters = &peers
+	serverOptions.v.masters = masterOptions.peers
 	serverOptions.v.idleConnectionTimeout = serverTimeout
 	serverOptions.v.dataCenter = serverDataCenter
 	serverOptions.v.rack = serverRack
--- a/weed/command/volume.go
+++ b/weed/command/volume.go
@ -62,6 +62,7 @@ type VolumeServerOptions struct {
 	preStopSeconds        *int
 	metricsHttpPort       *int
 	// pulseSeconds          *int
+	enableTcp *bool
 }

 func init() {
@ -88,6 +89,7 @@ func init() {
 	v.pprof = cmdVolume.Flag.Bool("pprof", false, "enable pprof http handlers. precludes --memprofile and --cpuprofile")
 	v.metricsHttpPort = cmdVolume.Flag.Int("metricsPort", 0, "Prometheus metrics listen port")
 	v.idxFolder = cmdVolume.Flag.String("dir.idx", "", "directory to store .idx files")
+	v.enableTcp = cmdVolume.Flag.Bool("tcp", false, "<exprimental> enable tcp port")
 }

 var cmdVolume = &Command{
@ -251,6 +253,11 @@ func (v VolumeServerOptions) startVolumeServer(volumeFolders, maxVolumeCounts, v
 		}
 	}

+	// starting tcp server
+	if *v.enableTcp {
+		go v.startTcpService(volumeServer)
+	}
+
 	// starting the cluster http server
 	clusterHttpServer := v.startClusterHttpService(volumeMux)

@ -368,3 +375,22 @@ func (v VolumeServerOptions) startClusterHttpService(handler http.Handler) httpd
 	}()
 	return clusterHttpServer
 }
+
+func (v VolumeServerOptions) startTcpService(volumeServer *weed_server.VolumeServer) {
+	listeningAddress := *v.bindIp + ":" + strconv.Itoa(*v.port+20000)
+	glog.V(0).Infoln("Start Seaweed volume server", util.Version(), "tcp at", listeningAddress)
+	listener, e := util.NewListener(listeningAddress, 0)
+	if e != nil {
+		glog.Fatalf("Volume server listener error on %s:%v", listeningAddress, e)
+	}
+	defer listener.Close()
+
+	for {
+		c, err := listener.Accept()
+		if err != nil {
+			fmt.Println(err)
+			return
+		}
+		go volumeServer.HandleTcpConnection(c)
+	}
+}
--- a/weed/command/webdav.go
+++ b/weed/command/webdav.go
@ -78,7 +78,7 @@ func (wo *WebDavOption) startWebDav() bool {
 	}

 	// parse filer grpc address
-	filerGrpcAddress, err := pb.ParseFilerGrpcAddress(*wo.filer)
+	filerGrpcAddress, err := pb.ParseServerToGrpcAddress(*wo.filer)
 	if err != nil {
 		glog.Fatal(err)
 		return false
--- a/weed/filer/filer_delete_entry.go
+++ b/weed/filer/filer_delete_entry.go
@ -11,6 +11,10 @@ import (

 type HardLinkId []byte

+const (
+	MsgFailDelNonEmptyFolder = "fail to delete non-empty folder"
+)
+
 func (f *Filer) DeleteEntryMetaAndData(ctx context.Context, p util.FullPath, isRecursive, ignoreRecursiveError, shouldDeleteChunks, isFromOtherCluster bool, signatures []int32) (err error) {
 	if p == "/" {
 		return nil
@ -77,7 +81,7 @@ func (f *Filer) doBatchDeleteFolderMetaAndData(ctx context.Context, entry *Entry
 			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("fail to delete non-empty folder: %s", entry.FullPath)
+				return nil, nil, fmt.Errorf("%s: %s", MsgFailDelNonEmptyFolder, entry.FullPath)
 			}

 			for _, sub := range entries {
--- a/weed/filer/filer_on_meta_event.go
+++ b/weed/filer/filer_on_meta_event.go
@ -11,6 +11,10 @@ import (

 // onMetadataChangeEvent is triggered after filer processed change events from local or remote filers
 func (f *Filer) onMetadataChangeEvent(event *filer_pb.SubscribeMetadataResponse) {
+	f.maybeReloadFilerConfiguration(event)
+}
+
+func (f *Filer) maybeReloadFilerConfiguration(event *filer_pb.SubscribeMetadataResponse) {
 	if DirectoryEtcSeaweedFS != event.Directory {
 		if DirectoryEtcSeaweedFS != event.EventNotification.NewParentPath {
 			return
@ -26,7 +30,6 @@ func (f *Filer) onMetadataChangeEvent(event *filer_pb.SubscribeMetadataResponse)
 	if entry.Name == FilerConfName {
 		f.reloadFilerConfiguration(entry)
 	}
-
 }

 func (f *Filer) readEntry(chunks []*filer_pb.FileChunk) ([]byte, error) {
--- a/weed/filer/meta_aggregator.go
+++ b/weed/filer/meta_aggregator.go
@ -69,6 +69,7 @@ func (ma *MetaAggregator) subscribeToOneFiler(f *Filer, self string, peer string
 		peerSignature, err = ma.readFilerStoreSignature(peer)
 	}

+	// when filer store is not shared by multiple filers
 	if peerSignature != f.Signature {
 		if prevTsNs, err := ma.readOffset(f, peer, peerSignature); err == nil {
 			lastTsNs = prevTsNs
--- a/weed/filer/stream.go
+++ b/weed/filer/stream.go
@ -15,7 +15,7 @@ import (

 func StreamContent(masterClient wdclient.HasLookupFileIdFunction, w io.Writer, chunks []*filer_pb.FileChunk, offset int64, size int64) error {

-	// fmt.Printf("start to stream content for chunks: %+v\n", chunks)
+	glog.V(9).Infof("start to stream content for chunks: %+v\n", chunks)
 	chunkViews := ViewFromChunks(masterClient.GetLookupFileIdFunction(), chunks, offset, size)

 	fileId2Url := make(map[string][]string)
@ -26,6 +26,9 @@ func StreamContent(masterClient wdclient.HasLookupFileIdFunction, w io.Writer, c
 		if err != nil {
 			glog.V(1).Infof("operation LookupFileId %s failed, err: %v", chunkView.FileId, err)
 			return err
+		} else if len(urlStrings) == 0 {
+			glog.Errorf("operation LookupFileId %s failed, err: urls not found", chunkView.FileId)
+			return fmt.Errorf("operation LookupFileId %s failed, err: urls not found", chunkView.FileId)
 		}
 		fileId2Url[chunkView.FileId] = urlStrings
 	}
@ -39,6 +42,7 @@ func StreamContent(masterClient wdclient.HasLookupFileIdFunction, w io.Writer, c
 			glog.Errorf("read chunk: %v", err)
 			return fmt.Errorf("read chunk: %v", err)
 		}
+
 		_, err = w.Write(data)
 		if err != nil {
 			glog.Errorf("write chunk: %v", err)
@ -181,7 +185,7 @@ func (c *ChunkStreamReader) fetchChunkToBuffer(chunkView *ChunkView) error {
 	var buffer bytes.Buffer
 	var shouldRetry bool
 	for _, urlString := range urlStrings {
-		shouldRetry, err = util.FastReadUrlAsStream(urlString+"?readDeleted=true", chunkView.CipherKey, chunkView.IsGzipped, chunkView.IsFullChunk(), chunkView.Offset, int(chunkView.Size), func(data []byte) {
+		shouldRetry, err = util.FastReadUrlAsStream(urlString, chunkView.CipherKey, chunkView.IsGzipped, chunkView.IsFullChunk(), chunkView.Offset, int(chunkView.Size), func(data []byte) {
 			buffer.Write(data)
 		})
 		if !shouldRetry {
--- a/weed/filesys/dir.go
+++ b/weed/filesys/dir.go
@ -251,10 +251,10 @@ func (dir *Dir) Mkdir(ctx context.Context, req *fuse.MkdirRequest) (fs.Node, err

 func (dir *Dir) Lookup(ctx context.Context, req *fuse.LookupRequest, resp *fuse.LookupResponse) (node fs.Node, err error) {

-	glog.V(4).Infof("dir Lookup %s: %s by %s", dir.FullPath(), req.Name, req.Header.String())
-
-	fullFilePath := util.NewFullPath(dir.FullPath(), req.Name)
 	dirPath := util.FullPath(dir.FullPath())
+	glog.V(4).Infof("dir Lookup %s: %s by %s", dirPath, req.Name, req.Header.String())
+
+	fullFilePath := dirPath.Child(req.Name)
 	visitErr := meta_cache.EnsureVisited(dir.wfs.metaCache, dir.wfs, dirPath)
 	if visitErr != nil {
 		glog.Errorf("dir Lookup %s: %v", dirPath, visitErr)
@ -305,7 +305,8 @@ func (dir *Dir) Lookup(ctx context.Context, req *fuse.LookupRequest, resp *fuse.

 func (dir *Dir) ReadDirAll(ctx context.Context) (ret []fuse.Dirent, err error) {

-	glog.V(4).Infof("dir ReadDirAll %s", dir.FullPath())
+	dirPath := util.FullPath(dir.FullPath())
+	glog.V(4).Infof("dir ReadDirAll %s", dirPath)

 	processEachEntryFn := func(entry *filer_pb.Entry, isLast bool) error {
 		if entry.IsDirectory {
@ -318,12 +319,11 @@ func (dir *Dir) ReadDirAll(ctx context.Context) (ret []fuse.Dirent, err error) {
 		return nil
 	}

-	dirPath := util.FullPath(dir.FullPath())
 	if err = meta_cache.EnsureVisited(dir.wfs.metaCache, dir.wfs, dirPath); err != nil {
 		glog.Errorf("dir ReadDirAll %s: %v", dirPath, err)
 		return nil, fuse.EIO
 	}
-	listErr := dir.wfs.metaCache.ListDirectoryEntries(context.Background(), util.FullPath(dir.FullPath()), "", false, int64(math.MaxInt32), func(entry *filer.Entry) bool {
+	listErr := dir.wfs.metaCache.ListDirectoryEntries(context.Background(), dirPath, "", false, int64(math.MaxInt32), func(entry *filer.Entry) bool {
 		processEachEntryFn(entry.ToProtoEntry(), false)
 		return true
 	})
@ -389,12 +389,12 @@ func (dir *Dir) removeOneFile(req *fuse.RemoveRequest) error {

 	// clear entry inside the file
 	fsNode := dir.wfs.fsNodeCache.GetFsNode(filePath)
+	dir.wfs.fsNodeCache.DeleteFsNode(filePath)
 	if fsNode != nil {
 		if file, ok := fsNode.(*File); ok {
 			file.clearEntry()
 		}
 	}
-	dir.wfs.fsNodeCache.DeleteFsNode(filePath)

 	// remove current file handle if any
 	dir.wfs.handlesLock.Lock()
--- a/weed/filesys/dir_link.go
+++ b/weed/filesys/dir_link.go
@ -35,15 +35,20 @@ func (dir *Dir) Link(ctx context.Context, req *fuse.LinkRequest, old fs.Node) (f
 		return nil, err
 	}

-	// update old file to hardlink mode
-	if len(oldFile.entry.HardLinkId) == 0 {
-		oldFile.entry.HardLinkId = append(util.RandomBytes(16), HARD_LINK_MARKER)
-		oldFile.entry.HardLinkCounter = 1
+	oldEntry := oldFile.getEntry()
+	if oldEntry == nil {
+		return nil, fuse.EIO
 	}
-	oldFile.entry.HardLinkCounter++
+
+	// update old file to hardlink mode
+	if len(oldEntry.HardLinkId) == 0 {
+		oldEntry.HardLinkId = append(util.RandomBytes(16), HARD_LINK_MARKER)
+		oldEntry.HardLinkCounter = 1
+	}
+	oldEntry.HardLinkCounter++
 	updateOldEntryRequest := &filer_pb.UpdateEntryRequest{
 		Directory:  oldFile.dir.FullPath(),
-		Entry:      oldFile.entry,
+		Entry:      oldEntry,
 		Signatures: []int32{dir.wfs.signature},
 	}

@ -53,11 +58,11 @@ func (dir *Dir) Link(ctx context.Context, req *fuse.LinkRequest, old fs.Node) (f
 		Entry: &filer_pb.Entry{
 			Name:            req.NewName,
 			IsDirectory:     false,
-			Attributes:      oldFile.entry.Attributes,
-			Chunks:          oldFile.entry.Chunks,
-			Extended:        oldFile.entry.Extended,
-			HardLinkId:      oldFile.entry.HardLinkId,
-			HardLinkCounter: oldFile.entry.HardLinkCounter,
+			Attributes:      oldEntry.Attributes,
+			Chunks:          oldEntry.Chunks,
+			Extended:        oldEntry.Extended,
+			HardLinkId:      oldEntry.HardLinkId,
+			HardLinkCounter: oldEntry.HardLinkCounter,
 		},
 		Signatures: []int32{dir.wfs.signature},
 	}
@ -83,6 +88,10 @@ func (dir *Dir) Link(ctx context.Context, req *fuse.LinkRequest, old fs.Node) (f
 		return nil
 	})

+	if err != nil {
+		return nil, fuse.EIO
+	}
+
 	// create new file node
 	newNode := dir.newFile(req.NewName, request.Entry)
 	newFile := newNode.(*File)
--- a/weed/filesys/dirty_page.go
+++ b/weed/filesys/dirty_page.go
@ -30,7 +30,7 @@ func newDirtyPages(file *File) *ContinuousDirtyPages {

 func (pages *ContinuousDirtyPages) AddPage(offset int64, data []byte) {

-	glog.V(4).Infof("%s AddPage [%d,%d) of %d bytes", pages.f.fullpath(), offset, offset+int64(len(data)), pages.f.entry.Attributes.FileSize)
+	glog.V(4).Infof("%s AddPage [%d,%d)", pages.f.fullpath(), offset, offset+int64(len(data)))

 	if len(data) > int(pages.f.wfs.option.ChunkSizeLimit) {
 		// this is more than what buffer can hold.
@ -69,7 +69,12 @@ func (pages *ContinuousDirtyPages) saveExistingLargestPageToStorage() (hasSavedD
 		return false
 	}

-	fileSize := int64(pages.f.entry.Attributes.FileSize)
+	entry := pages.f.getEntry()
+	if entry == nil {
+		return false
+	}
+
+	fileSize := int64(entry.Attributes.FileSize)

 	chunkSize := min(maxList.Size(), fileSize-maxList.Offset())
 	if chunkSize == 0 {
--- a/weed/filesys/file.go
+++ b/weed/filesys/file.go
@ -5,6 +5,7 @@ import (
 	"io"
 	"os"
 	"sort"
+	"sync"
 	"time"

 	"github.com/seaweedfs/fuse"
@ -33,6 +34,7 @@ type File struct {
 	dir            *Dir
 	wfs            *WFS
 	entry          *filer_pb.Entry
+	entryLock      sync.RWMutex
 	entryViewCache []filer.VisibleInterval
 	isOpen         int
 	reader         io.ReaderAt
@ -47,7 +49,7 @@ func (file *File) Attr(ctx context.Context, attr *fuse.Attr) (err error) {

 	glog.V(4).Infof("file Attr %s, open:%v existing:%v", file.fullpath(), file.isOpen, attr)

-	entry := file.entry
+	entry := file.getEntry()
 	if file.isOpen <= 0 || entry == nil {
 		if entry, err = file.maybeLoadEntry(ctx); err != nil {
 			return err
@ -106,7 +108,7 @@ func (file *File) Setattr(ctx context.Context, req *fuse.SetattrRequest, resp *f

 	glog.V(4).Infof("%v file setattr %+v", file.fullpath(), req)

-	_, err := file.maybeLoadEntry(ctx)
+	entry, err := file.maybeLoadEntry(ctx)
 	if err != nil {
 		return err
 	}
@ -123,12 +125,12 @@ func (file *File) Setattr(ctx context.Context, req *fuse.SetattrRequest, resp *f

 	if req.Valid.Size() {

-		glog.V(4).Infof("%v file setattr set size=%v chunks=%d", file.fullpath(), req.Size, len(file.entry.Chunks))
-		if req.Size < filer.FileSize(file.entry) {
+		glog.V(4).Infof("%v file setattr set size=%v chunks=%d", file.fullpath(), req.Size, len(entry.Chunks))
+		if req.Size < filer.FileSize(entry) {
 			// fmt.Printf("truncate %v \n", fullPath)
 			var chunks []*filer_pb.FileChunk
 			var truncatedChunks []*filer_pb.FileChunk
-			for _, chunk := range file.entry.Chunks {
+			for _, chunk := range entry.Chunks {
 				int64Size := int64(chunk.Size)
 				if chunk.Offset+int64Size > int64(req.Size) {
 					// this chunk is truncated
@ -143,36 +145,36 @@ func (file *File) Setattr(ctx context.Context, req *fuse.SetattrRequest, resp *f
 					}
 				}
 			}
-			file.entry.Chunks = chunks
+			entry.Chunks = chunks
 			file.entryViewCache, _ = filer.NonOverlappingVisibleIntervals(file.wfs.LookupFn(), chunks)
 			file.reader = nil
 		}
-		file.entry.Attributes.FileSize = req.Size
+		entry.Attributes.FileSize = req.Size
 		file.dirtyMetadata = true
 	}

 	if req.Valid.Mode() {
-		file.entry.Attributes.FileMode = uint32(req.Mode)
+		entry.Attributes.FileMode = uint32(req.Mode)
 		file.dirtyMetadata = true
 	}

 	if req.Valid.Uid() {
-		file.entry.Attributes.Uid = req.Uid
+		entry.Attributes.Uid = req.Uid
 		file.dirtyMetadata = true
 	}

 	if req.Valid.Gid() {
-		file.entry.Attributes.Gid = req.Gid
+		entry.Attributes.Gid = req.Gid
 		file.dirtyMetadata = true
 	}

 	if req.Valid.Crtime() {
-		file.entry.Attributes.Crtime = req.Crtime.Unix()
+		entry.Attributes.Crtime = req.Crtime.Unix()
 		file.dirtyMetadata = true
 	}

 	if req.Valid.Mtime() {
-		file.entry.Attributes.Mtime = req.Mtime.Unix()
+		entry.Attributes.Mtime = req.Mtime.Unix()
 		file.dirtyMetadata = true
 	}

@ -188,7 +190,7 @@ func (file *File) Setattr(ctx context.Context, req *fuse.SetattrRequest, resp *f
 		return nil
 	}

-	return file.saveEntry(file.entry)
+	return file.saveEntry(entry)

 }

@ -258,7 +260,7 @@ func (file *File) Forget() {
 }

 func (file *File) maybeLoadEntry(ctx context.Context) (entry *filer_pb.Entry, err error) {
-	entry = file.entry
+	entry = file.getEntry()
 	if file.isOpen > 0 {
 		return entry, nil
 	}
@ -299,8 +301,13 @@ func (file *File) addChunks(chunks []*filer_pb.FileChunk) {
 		}
 	}

+	entry := file.getEntry()
+	if entry == nil {
+		return
+	}
+
 	// pick out-of-order chunks from existing chunks
-	for _, chunk := range file.entry.Chunks {
+	for _, chunk := range entry.Chunks {
 		if lessThan(earliestChunk, chunk) {
 			chunks = append(chunks, chunk)
 		}
@ -318,18 +325,22 @@ func (file *File) addChunks(chunks []*filer_pb.FileChunk) {

 	file.reader = nil

-	glog.V(4).Infof("%s existing %d chunks adds %d more", file.fullpath(), len(file.entry.Chunks), len(chunks))
+	glog.V(4).Infof("%s existing %d chunks adds %d more", file.fullpath(), len(entry.Chunks), len(chunks))

-	file.entry.Chunks = append(file.entry.Chunks, newChunks...)
+	entry.Chunks = append(entry.Chunks, newChunks...)
 }

 func (file *File) setEntry(entry *filer_pb.Entry) {
+	file.entryLock.Lock()
+	defer file.entryLock.Unlock()
 	file.entry = entry
 	file.entryViewCache, _ = filer.NonOverlappingVisibleIntervals(file.wfs.LookupFn(), entry.Chunks)
 	file.reader = nil
 }

 func (file *File) clearEntry() {
+	file.entryLock.Lock()
+	defer file.entryLock.Unlock()
 	file.entry = nil
 	file.entryViewCache = nil
 	file.reader = nil
@ -359,3 +370,9 @@ func (file *File) saveEntry(entry *filer_pb.Entry) error {
 		return nil
 	})
 }
+
+func (file *File) getEntry() *filer_pb.Entry {
+	file.entryLock.RLock()
+	defer file.entryLock.RUnlock()
+	return file.entry
+}
--- a/weed/filesys/filehandle.go
+++ b/weed/filesys/filehandle.go
@ -40,8 +40,9 @@ func newFileHandle(file *File, uid, gid uint32) *FileHandle {
 		Uid:        uid,
 		Gid:        gid,
 	}
-	if fh.f.entry != nil {
-		fh.f.entry.Attributes.FileSize = filer.FileSize(fh.f.entry)
+	entry := fh.f.getEntry()
+	if entry != nil {
+		entry.Attributes.FileSize = filer.FileSize(entry)
 	}

 	return fh
@ -104,22 +105,28 @@ func (fh *FileHandle) readFromDirtyPages(buff []byte, startOffset int64) (maxSto

 func (fh *FileHandle) readFromChunks(buff []byte, offset int64) (int64, error) {

-	fileSize := int64(filer.FileSize(fh.f.entry))
-
-	if fileSize == 0 {
-		glog.V(1).Infof("empty fh %v", fh.f.fullpath())
+	entry := fh.f.getEntry()
+	if entry == nil {
 		return 0, io.EOF
 	}

-	if offset+int64(len(buff)) <= int64(len(fh.f.entry.Content)) {
-		totalRead := copy(buff, fh.f.entry.Content[offset:])
-		glog.V(4).Infof("file handle read cached %s [%d,%d] %d", fh.f.fullpath(), offset, offset+int64(totalRead), totalRead)
+	fileSize := int64(filer.FileSize(entry))
+	fileFullPath := fh.f.fullpath()
+
+	if fileSize == 0 {
+		glog.V(1).Infof("empty fh %v", fileFullPath)
+		return 0, io.EOF
+	}
+
+	if offset+int64(len(buff)) <= int64(len(entry.Content)) {
+		totalRead := copy(buff, entry.Content[offset:])
+		glog.V(4).Infof("file handle read cached %s [%d,%d] %d", fileFullPath, offset, offset+int64(totalRead), totalRead)
 		return int64(totalRead), nil
 	}

 	var chunkResolveErr error
 	if fh.f.entryViewCache == nil {
-		fh.f.entryViewCache, chunkResolveErr = filer.NonOverlappingVisibleIntervals(fh.f.wfs.LookupFn(), fh.f.entry.Chunks)
+		fh.f.entryViewCache, chunkResolveErr = filer.NonOverlappingVisibleIntervals(fh.f.wfs.LookupFn(), entry.Chunks)
 		if chunkResolveErr != nil {
 			return 0, fmt.Errorf("fail to resolve chunk manifest: %v", chunkResolveErr)
 		}
@ -136,10 +143,10 @@ func (fh *FileHandle) readFromChunks(buff []byte, offset int64) (int64, error) {
 	totalRead, err := reader.ReadAt(buff, offset)

 	if err != nil && err != io.EOF {
-		glog.Errorf("file handle read %s: %v", fh.f.fullpath(), err)
+		glog.Errorf("file handle read %s: %v", fileFullPath, err)
 	}

-	glog.V(4).Infof("file handle read %s [%d,%d] %d : %v", fh.f.fullpath(), offset, offset+int64(totalRead), totalRead, err)
+	glog.V(4).Infof("file handle read %s [%d,%d] %d : %v", fileFullPath, offset, offset+int64(totalRead), totalRead, err)

 	return int64(totalRead), err
 }
@ -158,8 +165,13 @@ func (fh *FileHandle) Write(ctx context.Context, req *fuse.WriteRequest, resp *f
 		copy(data, req.Data)
 	}

-	fh.f.entry.Content = nil
-	fh.f.entry.Attributes.FileSize = uint64(max(req.Offset+int64(len(data)), int64(fh.f.entry.Attributes.FileSize)))
+	entry := fh.f.getEntry()
+	if entry == nil {
+		return fuse.EIO
+	}
+
+	entry.Content = nil
+	entry.Attributes.FileSize = uint64(max(req.Offset+int64(len(data)), int64(entry.Attributes.FileSize)))
 	glog.V(4).Infof("%v write [%d,%d) %d", fh.f.fullpath(), req.Offset, req.Offset+int64(len(req.Data)), len(req.Data))

 	fh.dirtyPages.AddPage(req.Offset, data)
@ -242,35 +254,40 @@ func (fh *FileHandle) doFlush(ctx context.Context, header fuse.Header) error {

 	err := fh.f.wfs.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {

-		if fh.f.entry.Attributes != nil {
-			fh.f.entry.Attributes.Mime = fh.contentType
-			if fh.f.entry.Attributes.Uid == 0 {
-				fh.f.entry.Attributes.Uid = header.Uid
+		entry := fh.f.getEntry()
+		if entry == nil {
+			return nil
+		}
+
+		if entry.Attributes != nil {
+			entry.Attributes.Mime = fh.contentType
+			if entry.Attributes.Uid == 0 {
+				entry.Attributes.Uid = header.Uid
 			}
-			if fh.f.entry.Attributes.Gid == 0 {
-				fh.f.entry.Attributes.Gid = header.Gid
+			if entry.Attributes.Gid == 0 {
+				entry.Attributes.Gid = header.Gid
 			}
-			if fh.f.entry.Attributes.Crtime == 0 {
-				fh.f.entry.Attributes.Crtime = time.Now().Unix()
+			if entry.Attributes.Crtime == 0 {
+				entry.Attributes.Crtime = time.Now().Unix()
 			}
-			fh.f.entry.Attributes.Mtime = time.Now().Unix()
-			fh.f.entry.Attributes.FileMode = uint32(os.FileMode(fh.f.entry.Attributes.FileMode) &^ fh.f.wfs.option.Umask)
-			fh.f.entry.Attributes.Collection = fh.dirtyPages.collection
-			fh.f.entry.Attributes.Replication = fh.dirtyPages.replication
+			entry.Attributes.Mtime = time.Now().Unix()
+			entry.Attributes.FileMode = uint32(os.FileMode(entry.Attributes.FileMode) &^ fh.f.wfs.option.Umask)
+			entry.Attributes.Collection = fh.dirtyPages.collection
+			entry.Attributes.Replication = fh.dirtyPages.replication
 		}

 		request := &filer_pb.CreateEntryRequest{
 			Directory:  fh.f.dir.FullPath(),
-			Entry:      fh.f.entry,
+			Entry:      entry,
 			Signatures: []int32{fh.f.wfs.signature},
 		}

-		glog.V(4).Infof("%s set chunks: %v", fh.f.fullpath(), len(fh.f.entry.Chunks))
-		for i, chunk := range fh.f.entry.Chunks {
+		glog.V(4).Infof("%s set chunks: %v", fh.f.fullpath(), len(entry.Chunks))
+		for i, chunk := range entry.Chunks {
 			glog.V(4).Infof("%s chunks %d: %v [%d,%d)", fh.f.fullpath(), i, chunk.GetFileIdString(), chunk.Offset, chunk.Offset+int64(chunk.Size))
 		}

-		manifestChunks, nonManifestChunks := filer.SeparateManifestChunks(fh.f.entry.Chunks)
+		manifestChunks, nonManifestChunks := filer.SeparateManifestChunks(entry.Chunks)

 		chunks, _ := filer.CompactFileChunks(fh.f.wfs.LookupFn(), nonManifestChunks)
 		chunks, manifestErr := filer.MaybeManifestize(fh.f.wfs.saveDataAsChunk(fh.f.fullpath()), chunks)
@ -278,7 +295,7 @@ func (fh *FileHandle) doFlush(ctx context.Context, header fuse.Header) error {
 			// not good, but should be ok
 			glog.V(0).Infof("MaybeManifestize: %v", manifestErr)
 		}
-		fh.f.entry.Chunks = append(chunks, manifestChunks...)
+		entry.Chunks = append(chunks, manifestChunks...)

 		fh.f.wfs.mapPbIdFromLocalToFiler(request.Entry)
 		defer fh.f.wfs.mapPbIdFromFilerToLocal(request.Entry)
--- a/weed/filesys/fscache.go
+++ b/weed/filesys/fscache.go
@ -124,8 +124,9 @@ func (c *FsCache) Move(oldPath util.FullPath, newPath util.FullPath) *FsNode {
 	}
 	if f, ok := src.node.(*File); ok {
 		f.Name = target.name
-		if f.entry != nil {
-			f.entry.Name = f.Name
+		entry := f.getEntry()
+		if entry != nil {
+			entry.Name = f.Name
 		}
 	}
 	parent.disconnectChild(target)
--- a/weed/operation/upload_content.go
+++ b/weed/operation/upload_content.go
@ -31,6 +31,7 @@ type UploadResult struct {
 	Mime       string `json:"mime,omitempty"`
 	Gzip       uint32 `json:"gzip,omitempty"`
 	ContentMd5 string `json:"contentMd5,omitempty"`
+	RetryCount int    `json:"-"`
 }

 func (uploadResult *UploadResult) ToPbFileChunk(fileId string, offset int64) *filer_pb.FileChunk {
@ -96,6 +97,7 @@ func retriedUploadData(uploadUrl string, filename string, cipher bool, data []by
 	for i := 0; i < 3; i++ {
 		uploadResult, err = doUploadData(uploadUrl, filename, cipher, data, isInputCompressed, mtype, pairMap, jwt)
 		if err == nil {
+			uploadResult.RetryCount = i
 			return
 		} else {
 			glog.Warningf("uploading to %s: %v", uploadUrl, err)
--- a/weed/pb/filer_pb/filer_client.go
+++ b/weed/pb/filer_pb/filer_client.go
@ -5,6 +5,7 @@ import (
 	"errors"
 	"fmt"
 	"io"
+	"math"
 	"os"
 	"strings"
 	"time"
@ -101,12 +102,16 @@ func SeaweedList(client SeaweedFilerClient, parentDirectoryPath, prefix string,
 }

 func doSeaweedList(client SeaweedFilerClient, fullDirPath util.FullPath, prefix string, fn EachEntryFunciton, startFrom string, inclusive bool, limit uint32) (err error) {
-
+	// Redundancy limit to make it correctly judge whether it is the last file.
+	redLimit := limit
+	if limit != math.MaxInt32 && limit != 0{
+		redLimit = limit + 1
+	}
 	request := &ListEntriesRequest{
 		Directory:          string(fullDirPath),
 		Prefix:             prefix,
 		StartFromFileName:  startFrom,
-		Limit:              limit,
+		Limit:              redLimit,
 		InclusiveStartFrom: inclusive,
 	}

@ -119,6 +124,7 @@ func doSeaweedList(client SeaweedFilerClient, fullDirPath util.FullPath, prefix
 	}

 	var prevEntry *Entry
+	count := 0
 	for {
 		resp, recvErr := stream.Recv()
 		if recvErr != nil {
@ -139,6 +145,10 @@ func doSeaweedList(client SeaweedFilerClient, fullDirPath util.FullPath, prefix
 			}
 		}
 		prevEntry = resp.Entry
+		count++
+		if count > int(limit) && limit != 0 {
+			prevEntry = nil
+		}
 	}

 	return nil
--- a/weed/pb/grpc_client_server.go
+++ b/weed/pb/grpc_client_server.go
@ -3,6 +3,7 @@ package pb
 import (
 	"context"
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/glog"
 	"net/http"
 	"strconv"
 	"strings"
@ -108,51 +109,55 @@ func WithCachedGrpcClient(fn func(*grpc.ClientConn) error, address string, opts
 }

 func ParseServerToGrpcAddress(server string) (serverGrpcAddress string, err error) {
-	colonIndex := strings.LastIndex(server, ":")
-	if colonIndex < 0 {
-		return "", fmt.Errorf("server should have hostname:port format: %v", server)
-	}
+	return ParseServerAddress(server, 10000)
+}

-	port, parseErr := strconv.ParseUint(server[colonIndex+1:], 10, 64)
+func ParseServerAddress(server string, deltaPort int) (newServerAddress string, err error) {
+
+	host, port, parseErr := hostAndPort(server)
 	if parseErr != nil {
 		return "", fmt.Errorf("server port parse error: %v", parseErr)
 	}

-	grpcPort := int(port) + 10000
+	newPort := int(port) + deltaPort

-	return fmt.Sprintf("%s:%d", server[:colonIndex], grpcPort), nil
+	return fmt.Sprintf("%s:%d", host, newPort), nil
+}
+
+func hostAndPort(address string) (host string, port uint64, err error) {
+	colonIndex := strings.LastIndex(address, ":")
+	if colonIndex < 0 {
+		return "", 0, fmt.Errorf("server should have hostname:port format: %v", address)
+	}
+	port, err = strconv.ParseUint(address[colonIndex+1:], 10, 64)
+	if err != nil {
+		return "", 0, fmt.Errorf("server port parse error: %v", err)
+	}
+
+	return address[:colonIndex], port, err
 }

 func ServerToGrpcAddress(server string) (serverGrpcAddress string) {
-	hostnameAndPort := strings.Split(server, ":")
-	if len(hostnameAndPort) != 2 {
-		return fmt.Sprintf("unexpected server address: %s", server)
-	}

-	port, parseErr := strconv.ParseUint(hostnameAndPort[1], 10, 64)
+	host, port, parseErr := hostAndPort(server)
 	if parseErr != nil {
-		return fmt.Sprintf("failed to parse port for %s:%s", hostnameAndPort[0], hostnameAndPort[1])
+		glog.Fatalf("server address %s parse error: %v", server, parseErr)
 	}

 	grpcPort := int(port) + 10000

-	return fmt.Sprintf("%s:%d", hostnameAndPort[0], grpcPort)
+	return fmt.Sprintf("%s:%d", host, grpcPort)
 }

 func GrpcAddressToServerAddress(grpcAddress string) (serverAddress string) {
-	hostnameAndPort := strings.Split(grpcAddress, ":")
-	if len(hostnameAndPort) != 2 {
-		return fmt.Sprintf("unexpected grpcAddress: %s", grpcAddress)
-	}
-
-	grpcPort, parseErr := strconv.ParseUint(hostnameAndPort[1], 10, 64)
+	host, grpcPort, parseErr := hostAndPort(grpcAddress)
 	if parseErr != nil {
-		return fmt.Sprintf("failed to parse port for %s:%s", hostnameAndPort[0], hostnameAndPort[1])
+		glog.Fatalf("server grpc address %s parse error: %v", grpcAddress, parseErr)
 	}

 	port := int(grpcPort) - 10000

-	return fmt.Sprintf("%s:%d", hostnameAndPort[0], port)
+	return fmt.Sprintf("%s:%d", host, port)
 }

 func WithMasterClient(master string, grpcDialOption grpc.DialOption, fn func(client master_pb.SeaweedClient) error) error {
@ -197,19 +202,3 @@ func WithGrpcFilerClient(filerGrpcAddress string, grpcDialOption grpc.DialOption
 	}, filerGrpcAddress, grpcDialOption)

 }
-
-func ParseFilerGrpcAddress(filer string) (filerGrpcAddress string, err error) {
-	hostnameAndPort := strings.Split(filer, ":")
-	if len(hostnameAndPort) != 2 {
-		return "", fmt.Errorf("filer should have hostname:port format: %v", hostnameAndPort)
-	}
-
-	filerPort, parseErr := strconv.ParseUint(hostnameAndPort[1], 10, 64)
-	if parseErr != nil {
-		return "", fmt.Errorf("filer port parse error: %v", parseErr)
-	}
-
-	filerGrpcPort := int(filerPort) + 10000
-
-	return fmt.Sprintf("%s:%d", hostnameAndPort[0], filerGrpcPort), nil
-}
--- a/weed/pb/volume_info.go
+++ b/weed/pb/volume_info.go
@ -15,40 +15,49 @@ import (
 )

 // MaybeLoadVolumeInfo load the file data as *volume_server_pb.VolumeInfo, the returned volumeInfo will not be nil
-func MaybeLoadVolumeInfo(fileName string) (*volume_server_pb.VolumeInfo, bool, error) {
+func MaybeLoadVolumeInfo(fileName string) (volumeInfo *volume_server_pb.VolumeInfo, hasRemoteFile bool, hasVolumeInfoFile bool, err error) {

-	volumeInfo := &volume_server_pb.VolumeInfo{}
+	volumeInfo = &volume_server_pb.VolumeInfo{}

 	glog.V(1).Infof("maybeLoadVolumeInfo checks %s", fileName)
 	if exists, canRead, _, _, _ := util.CheckFile(fileName); !exists || !canRead {
 		if !exists {
-			return volumeInfo, false, nil
+			return
 		}
+		hasVolumeInfoFile = true
 		if !canRead {
 			glog.Warningf("can not read %s", fileName)
-			return volumeInfo, false, fmt.Errorf("can not read %s", fileName)
+			err = fmt.Errorf("can not read %s", fileName)
+			return
 		}
-		return volumeInfo, false, nil
+		return
 	}

+	hasVolumeInfoFile = true
+
 	glog.V(1).Infof("maybeLoadVolumeInfo reads %s", fileName)
 	tierData, readErr := ioutil.ReadFile(fileName)
 	if readErr != nil {
 		glog.Warningf("fail to read %s : %v", fileName, readErr)
-		return volumeInfo, false, fmt.Errorf("fail to read %s : %v", fileName, readErr)
+		err = fmt.Errorf("fail to read %s : %v", fileName, readErr)
+		return
+
 	}

 	glog.V(1).Infof("maybeLoadVolumeInfo Unmarshal volume info %v", fileName)
-	if err := jsonpb.Unmarshal(bytes.NewReader(tierData), volumeInfo); err != nil {
+	if err = jsonpb.Unmarshal(bytes.NewReader(tierData), volumeInfo); err != nil {
 		glog.Warningf("unmarshal error: %v", err)
-		return volumeInfo, false, fmt.Errorf("unmarshal error: %v", err)
+		err = fmt.Errorf("unmarshal error: %v", err)
+		return
 	}

 	if len(volumeInfo.GetFiles()) == 0 {
-		return volumeInfo, false, nil
+		return
 	}

-	return volumeInfo, true, nil
+	hasRemoteFile = true
+
+	return
 }

 func SaveVolumeInfo(fileName string, volumeInfo *volume_server_pb.VolumeInfo) error {
--- a/weed/replication/repl_util/replication_util.go
+++ b/weed/replication/repl_util/replication_util.go
@ -20,7 +20,7 @@ func CopyFromChunkViews(chunkViews []*filer.ChunkView, filerSource *source.Filer
 		var shouldRetry bool

 		for _, fileUrl := range fileUrls {
-			shouldRetry, err = util.FastReadUrlAsStream(fileUrl+"?readDeleted=true", nil, false, chunk.IsFullChunk(), chunk.Offset, int(chunk.Size), func(data []byte) {
+			shouldRetry, err = util.FastReadUrlAsStream(fileUrl, nil, false, chunk.IsFullChunk(), chunk.Offset, int(chunk.Size), func(data []byte) {
 				writeErr = writeFunc(data)
 			})
 			if err != nil {
--- a/weed/replication/replicator.go
+++ b/weed/replication/replicator.go
@ -42,7 +42,7 @@ func (r *Replicator) Replicate(ctx context.Context, key string, message *filer_p
 		return nil
 	}
 	var dateKey string
-	if r.sink.GetName() == "local_incremental" {
+	if r.sink.IsIncremental() {
 		var mTime int64
 		if message.NewEntry != nil {
 			mTime = message.NewEntry.Attributes.Mtime
--- a/weed/replication/sink/azuresink/azure_sink.go
+++ b/weed/replication/sink/azuresink/azure_sink.go
@ -18,10 +18,11 @@ import (
 )

 type AzureSink struct {
-	containerURL azblob.ContainerURL
-	container    string
-	dir          string
-	filerSource  *source.FilerSource
+	containerURL  azblob.ContainerURL
+	container     string
+	dir           string
+	filerSource   *source.FilerSource
+	isIncremental bool
 }

 func init() {
@ -36,7 +37,12 @@ func (g *AzureSink) GetSinkToDirectory() string {
 	return g.dir
 }

+func (g *AzureSink) IsIncremental() bool {
+	return g.isIncremental
+}
+
 func (g *AzureSink) Initialize(configuration util.Configuration, prefix string) error {
+	g.isIncremental = configuration.GetBool(prefix + "is_incremental")
 	return g.initialize(
 		configuration.GetString(prefix+"account_name"),
 		configuration.GetString(prefix+"account_key"),
--- a/weed/replication/sink/b2sink/b2_sink.go
+++ b/weed/replication/sink/b2sink/b2_sink.go
@ -14,10 +14,11 @@ import (
 )

 type B2Sink struct {
-	client      *b2.Client
-	bucket      string
-	dir         string
-	filerSource *source.FilerSource
+	client        *b2.Client
+	bucket        string
+	dir           string
+	filerSource   *source.FilerSource
+	isIncremental bool
 }

 func init() {
@ -32,7 +33,12 @@ func (g *B2Sink) GetSinkToDirectory() string {
 	return g.dir
 }

+func (g *B2Sink) IsIncremental() bool {
+	return g.isIncremental
+}
+
 func (g *B2Sink) Initialize(configuration util.Configuration, prefix string) error {
+	g.isIncremental = configuration.GetBool(prefix + "is_incremental")
 	return g.initialize(
 		configuration.GetString(prefix+"b2_account_id"),
 		configuration.GetString(prefix+"b2_master_application_key"),
--- a/weed/replication/sink/filersink/filer_sink.go
+++ b/weed/replication/sink/filersink/filer_sink.go
@ -30,6 +30,7 @@ type FilerSink struct {
 	grpcDialOption    grpc.DialOption
 	address           string
 	writeChunkByFiler bool
+	isIncremental     bool
 }

 func init() {
@ -44,7 +45,12 @@ func (fs *FilerSink) GetSinkToDirectory() string {
 	return fs.dir
 }

+func (fs *FilerSink) IsIncremental() bool {
+	return fs.isIncremental
+}
+
 func (fs *FilerSink) Initialize(configuration util.Configuration, prefix string) error {
+	fs.isIncremental = configuration.GetBool(prefix + "is_incremental")
 	return fs.DoInitialize(
 		"",
 		configuration.GetString(prefix+"grpcAddress"),
--- a/weed/replication/sink/gcssink/gcs_sink.go
+++ b/weed/replication/sink/gcssink/gcs_sink.go
@ -18,10 +18,11 @@ import (
 )

 type GcsSink struct {
-	client      *storage.Client
-	bucket      string
-	dir         string
-	filerSource *source.FilerSource
+	client        *storage.Client
+	bucket        string
+	dir           string
+	filerSource   *source.FilerSource
+	isIncremental bool
 }

 func init() {
@ -36,7 +37,12 @@ func (g *GcsSink) GetSinkToDirectory() string {
 	return g.dir
 }

+func (g *GcsSink) IsIncremental() bool {
+	return g.isIncremental
+}
+
 func (g *GcsSink) Initialize(configuration util.Configuration, prefix string) error {
+	g.isIncremental = configuration.GetBool(prefix + "is_incremental")
 	return g.initialize(
 		configuration.GetString(prefix+"google_application_credentials"),
 		configuration.GetString(prefix+"bucket"),
--- a/weed/replication/sink/localsink/local_sink.go
+++ b/weed/replication/sink/localsink/local_sink.go
@ -50,6 +50,10 @@ func (localsink *LocalSink) GetSinkToDirectory() string {
 	return localsink.Dir
 }

+func (localsink *LocalSink) IsIncremental() bool {
+	return true
+}
+
 func (localsink *LocalSink) DeleteEntry(key string, isDirectory, deleteIncludeChunks bool, signatures []int32) error {
 	if localsink.isMultiPartEntry(key) {
 		return nil
@ -74,13 +78,13 @@ func (localsink *LocalSink) CreateEntry(key string, entry *filer_pb.Entry, signa

 	if _, err := os.Stat(dir); os.IsNotExist(err) {
 		glog.V(4).Infof("Create Direcotry key: %s", dir)
-		if err = os.MkdirAll(dir, 0); err != nil {
+		if err = os.MkdirAll(dir, 0755); err != nil {
 			return err
 		}
 	}

 	writeFunc := func(data []byte) error {
-		writeErr := ioutil.WriteFile(key, data, 0)
+		writeErr := ioutil.WriteFile(key, data, 0755)
 		return writeErr
 	}

--- a/weed/replication/sink/replication_sink.go
+++ b/weed/replication/sink/replication_sink.go
@ -14,6 +14,7 @@ type ReplicationSink interface {
 	UpdateEntry(key string, oldEntry *filer_pb.Entry, newParentPath string, newEntry *filer_pb.Entry, deleteIncludeChunks bool, signatures []int32) (foundExistingEntry bool, err error)
 	GetSinkToDirectory() string
 	SetSourceFiler(s *source.FilerSource)
+	IsIncremental() bool
 }

 var (
--- a/weed/replication/sink/s3sink/s3_sink.go
+++ b/weed/replication/sink/s3sink/s3_sink.go
@ -21,12 +21,13 @@ import (
 )

 type S3Sink struct {
-	conn        s3iface.S3API
-	region      string
-	bucket      string
-	dir         string
-	endpoint    string
-	filerSource *source.FilerSource
+	conn          s3iface.S3API
+	region        string
+	bucket        string
+	dir           string
+	endpoint      string
+	filerSource   *source.FilerSource
+	isIncremental bool
 }

 func init() {
@ -41,11 +42,17 @@ func (s3sink *S3Sink) GetSinkToDirectory() string {
 	return s3sink.dir
 }

+func (s3sink *S3Sink) IsIncremental() bool {
+	return s3sink.isIncremental
+}
+
 func (s3sink *S3Sink) Initialize(configuration util.Configuration, prefix string) error {
 	glog.V(0).Infof("sink.s3.region: %v", configuration.GetString(prefix+"region"))
 	glog.V(0).Infof("sink.s3.bucket: %v", configuration.GetString(prefix+"bucket"))
 	glog.V(0).Infof("sink.s3.directory: %v", configuration.GetString(prefix+"directory"))
 	glog.V(0).Infof("sink.s3.endpoint: %v", configuration.GetString(prefix+"endpoint"))
+	glog.V(0).Infof("sink.s3.is_incremental: %v", configuration.GetString(prefix+"is_incremental"))
+	s3sink.isIncremental = configuration.GetBool(prefix + "is_incremental")
 	return s3sink.initialize(
 		configuration.GetString(prefix+"aws_access_key_id"),
 		configuration.GetString(prefix+"aws_secret_access_key"),
@ -67,8 +74,9 @@ func (s3sink *S3Sink) initialize(awsAccessKeyId, awsSecretAccessKey, region, buc
 	s3sink.endpoint = endpoint

 	config := &aws.Config{
-		Region:   aws.String(s3sink.region),
-		Endpoint: aws.String(s3sink.endpoint),
+		Region:           aws.String(s3sink.region),
+		Endpoint:         aws.String(s3sink.endpoint),
+		S3ForcePathStyle: aws.Bool(true),
 	}
 	if awsAccessKeyId != "" && awsSecretAccessKey != "" {
 		config.Credentials = credentials.NewStaticCredentials(awsAccessKeyId, awsSecretAccessKey, "")
@ -104,7 +112,7 @@ func (s3sink *S3Sink) CreateEntry(key string, entry *filer_pb.Entry, signatures

 	uploadId, err := s3sink.createMultipartUpload(key, entry)
 	if err != nil {
-		return err
+		return fmt.Errorf("createMultipartUpload: %v", err)
 	}

 	totalSize := filer.FileSize(entry)
@ -120,6 +128,7 @@ func (s3sink *S3Sink) CreateEntry(key string, entry *filer_pb.Entry, signatures
 			defer wg.Done()
 			if part, uploadErr := s3sink.uploadPart(key, uploadId, partId, chunk); uploadErr != nil {
 				err = uploadErr
+				glog.Errorf("uploadPart: %v", uploadErr)
 			} else {
 				parts[index] = part
 			}
@ -129,7 +138,7 @@ func (s3sink *S3Sink) CreateEntry(key string, entry *filer_pb.Entry, signatures

 	if err != nil {
 		s3sink.abortMultipartUpload(key, uploadId)
-		return err
+		return fmt.Errorf("uploadPart: %v", err)
 	}

 	return s3sink.completeMultipartUpload(context.Background(), key, uploadId, parts)
--- a/weed/replication/sink/s3sink/s3_write.go
+++ b/weed/replication/sink/s3sink/s3_write.go
@ -24,7 +24,7 @@ func (s3sink *S3Sink) deleteObject(key string) error {
 	result, err := s3sink.conn.DeleteObject(input)

 	if err == nil {
-		glog.V(0).Infof("[%s] delete %s: %v", s3sink.bucket, key, result)
+		glog.V(2).Infof("[%s] delete %s: %v", s3sink.bucket, key, result)
 	} else {
 		glog.Errorf("[%s] delete %s: %v", s3sink.bucket, key, err)
 	}
@ -43,7 +43,7 @@ func (s3sink *S3Sink) createMultipartUpload(key string, entry *filer_pb.Entry) (
 	result, err := s3sink.conn.CreateMultipartUpload(input)

 	if err == nil {
-		glog.V(0).Infof("[%s] createMultipartUpload %s: %v", s3sink.bucket, key, result)
+		glog.V(2).Infof("[%s] createMultipartUpload %s: %v", s3sink.bucket, key, result)
 	} else {
 		glog.Errorf("[%s] createMultipartUpload %s: %v", s3sink.bucket, key, err)
 		return "", err
@ -94,12 +94,13 @@ func (s3sink *S3Sink) completeMultipartUpload(ctx context.Context, key, uploadId

 	result, err := s3sink.conn.CompleteMultipartUpload(input)
 	if err == nil {
-		glog.V(0).Infof("[%s] completeMultipartUpload %s: %v", s3sink.bucket, key, result)
+		glog.V(2).Infof("[%s] completeMultipartUpload %s: %v", s3sink.bucket, key, result)
 	} else {
 		glog.Errorf("[%s] completeMultipartUpload %s: %v", s3sink.bucket, key, err)
+		return fmt.Errorf("[%s] completeMultipartUpload %s: %v", s3sink.bucket, key, err)
 	}

-	return err
+	return nil
 }

 // To upload a part
@ -122,7 +123,7 @@ func (s3sink *S3Sink) uploadPart(key, uploadId string, partId int, chunk *filer.

 	result, err := s3sink.conn.UploadPart(input)
 	if err == nil {
-		glog.V(0).Infof("[%s] uploadPart %s %d upload: %v", s3sink.bucket, key, partId, result)
+		glog.V(2).Infof("[%s] uploadPart %s %d upload: %v", s3sink.bucket, key, partId, result)
 	} else {
 		glog.Errorf("[%s] uploadPart %s %d upload: %v", s3sink.bucket, key, partId, err)
 	}
@ -163,7 +164,7 @@ func (s3sink *S3Sink) buildReadSeeker(chunk *filer.ChunkView) (io.ReadSeeker, er
 	}
 	buf := make([]byte, chunk.Size)
 	for _, fileUrl := range fileUrls {
-		_, err = util.ReadUrl(fileUrl+"?readDeleted=true", nil, false, false, chunk.Offset, int(chunk.Size), buf)
+		_, err = util.ReadUrl(fileUrl, chunk.CipherKey, chunk.IsGzipped, false, chunk.Offset, int(chunk.Size), buf)
 		if err != nil {
 			glog.V(1).Infof("read from %s: %v", fileUrl, err)
 		} else {
--- a/weed/replication/source/filer_source.go
+++ b/weed/replication/source/filer_source.go
@ -83,8 +83,12 @@ func (fs *FilerSource) LookupFileId(part string) (fileUrls []string, err error)
 		return nil, fmt.Errorf("LookupFileId locate volume id %s: %v", vid, err)
 	}

-	for _, loc := range locations.Locations {
-		fileUrls = append(fileUrls, fmt.Sprintf("http://%s/%s", loc.Url, part))
+	if !fs.proxyByFiler {
+		for _, loc := range locations.Locations {
+			fileUrls = append(fileUrls, fmt.Sprintf("http://%s/%s?readDeleted=true", loc.Url, part))
+		}
+	} else {
+		fileUrls = append(fileUrls, fmt.Sprintf("http://%s/?proxyChunkId=%s", fs.address, part))
 	}

 	return
--- a/weed/s3api/filer_util.go
+++ b/weed/s3api/filer_util.go
@ -31,6 +31,10 @@ func (s3a *S3ApiServer) list(parentDirectoryPath, prefix, startFrom string, incl
 		return nil
 	}, startFrom, inclusive, limit)

+	if len(entries) == 0 {
+		isLast = true
+	}
+
 	return

 }
--- a/weed/s3api/s3api_bucket_handlers.go
+++ b/weed/s3api/s3api_bucket_handlers.go
@ -51,7 +51,7 @@ func (s3a *S3ApiServer) ListBucketsHandler(w http.ResponseWriter, r *http.Reques
 	var buckets []*s3.Bucket
 	for _, entry := range entries {
 		if entry.IsDirectory {
-			if identity != nil && !identity.canDo(s3_constants.ACTION_ADMIN, entry.Name) {
+			if identity != nil && !identity.canDo(s3_constants.ACTION_LIST, entry.Name) {
 				continue
 			}
 			buckets = append(buckets, &s3.Bucket{
--- a/weed/s3api/s3api_object_handlers.go
+++ b/weed/s3api/s3api_object_handlers.go
@ -5,9 +5,11 @@ import (
 	"encoding/json"
 	"encoding/xml"
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/filer"
 	"io"
 	"io/ioutil"
 	"net/http"
+	"net/url"
 	"sort"
 	"strings"

@ -69,7 +71,7 @@ func (s3a *S3ApiServer) PutObjectHandler(w http.ResponseWriter, r *http.Request)
 			return
 		}
 	} else {
-		uploadUrl := fmt.Sprintf("http://%s%s/%s%s", s3a.option.Filer, s3a.option.BucketsPath, bucket, object)
+		uploadUrl := fmt.Sprintf("http://%s%s/%s%s", s3a.option.Filer, s3a.option.BucketsPath, bucket, urlPathEscape(object))

 		etag, errCode := s3a.putToFiler(r, uploadUrl, dataReader)

@ -84,6 +86,14 @@ func (s3a *S3ApiServer) PutObjectHandler(w http.ResponseWriter, r *http.Request)
 	writeSuccessResponseEmpty(w)
 }

+func urlPathEscape(object string) string {
+	var escapedParts []string
+	for _, part := range strings.Split(object, "/") {
+		escapedParts = append(escapedParts, url.PathEscape(part))
+	}
+	return strings.Join(escapedParts, "/")
+}
+
 func (s3a *S3ApiServer) GetObjectHandler(w http.ResponseWriter, r *http.Request) {

 	bucket, object := getBucketAndObject(r)
@ -94,7 +104,7 @@ func (s3a *S3ApiServer) GetObjectHandler(w http.ResponseWriter, r *http.Request)
 	}

 	destUrl := fmt.Sprintf("http://%s%s/%s%s",
-		s3a.option.Filer, s3a.option.BucketsPath, bucket, object)
+		s3a.option.Filer, s3a.option.BucketsPath, bucket, urlPathEscape(object))

 	s3a.proxyToFiler(w, r, destUrl, passThroughResponse)

@ -105,7 +115,7 @@ func (s3a *S3ApiServer) HeadObjectHandler(w http.ResponseWriter, r *http.Request
 	bucket, object := getBucketAndObject(r)

 	destUrl := fmt.Sprintf("http://%s%s/%s%s",
-		s3a.option.Filer, s3a.option.BucketsPath, bucket, object)
+		s3a.option.Filer, s3a.option.BucketsPath, bucket, urlPathEscape(object))

 	s3a.proxyToFiler(w, r, destUrl, passThroughResponse)

@ -116,7 +126,7 @@ func (s3a *S3ApiServer) DeleteObjectHandler(w http.ResponseWriter, r *http.Reque
 	bucket, object := getBucketAndObject(r)

 	destUrl := fmt.Sprintf("http://%s%s/%s%s?recursive=true",
-		s3a.option.Filer, s3a.option.BucketsPath, bucket, object)
+		s3a.option.Filer, s3a.option.BucketsPath, bucket, urlPathEscape(object))

 	s3a.proxyToFiler(w, r, destUrl, func(proxyResponse *http.Response, w http.ResponseWriter) {
 		for k, v := range proxyResponse.Header {
@ -196,6 +206,8 @@ func (s3a *S3ApiServer) DeleteMultipleObjectsHandler(w http.ResponseWriter, r *h
 			if err == nil {
 				directoriesWithDeletion[parentDirectoryPath]++
 				deletedObjects = append(deletedObjects, object)
+			} else if strings.Contains(err.Error(), filer.MsgFailDelNonEmptyFolder) {
+				deletedObjects = append(deletedObjects, object)
 			} else {
 				delete(directoriesWithDeletion, parentDirectoryPath)
 				deleteErrors = append(deleteErrors, DeleteError{
--- a/weed/s3api/s3api_object_handlers_postpolicy.go
+++ b/weed/s3api/s3api_object_handlers_postpolicy.go
@ -110,7 +110,7 @@ func (s3a *S3ApiServer) PostPolicyBucketHandler(w http.ResponseWriter, r *http.R
 		}
 	}

-	uploadUrl := fmt.Sprintf("http://%s%s/%s/%s", s3a.option.Filer, s3a.option.BucketsPath, bucket, object)
+	uploadUrl := fmt.Sprintf("http://%s%s/%s%s", s3a.option.Filer, s3a.option.BucketsPath, bucket, urlPathEscape(object))

 	etag, errCode := s3a.putToFiler(r, uploadUrl, fileBody)

--- a/weed/security/tls.go
+++ b/weed/security/tls.go
@ -1,10 +1,16 @@
 package security

 import (
+	"context"
 	"crypto/tls"
 	"crypto/x509"
 	"github.com/chrislusf/seaweedfs/weed/util"
+	grpc_auth "github.com/grpc-ecosystem/go-grpc-middleware/auth"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/peer"
+	"google.golang.org/grpc/status"
 	"io/ioutil"
+	"strings"

 	"google.golang.org/grpc"
 	"google.golang.org/grpc/credentials"
@ -12,21 +18,29 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/glog"
 )

-func LoadServerTLS(config *util.ViperProxy, component string) grpc.ServerOption {
+type Authenticator struct {
+	AllowedWildcardDomain string
+	AllowedCommonNames    map[string]bool
+}
+
+func LoadServerTLS(config *util.ViperProxy, component string) (grpc.ServerOption, grpc.ServerOption) {
 	if config == nil {
-		return nil
+		return nil, nil
 	}

 	// load cert/key, ca cert
 	cert, err := tls.LoadX509KeyPair(config.GetString(component+".cert"), config.GetString(component+".key"))
 	if err != nil {
-		glog.V(1).Infof("load cert/key error: %v", err)
-		return nil
+		glog.V(1).Infof("load cert: %s / key: %s error: %v",
+			config.GetString(component+".cert"),
+			config.GetString(component+".key"),
+			err)
+		return nil, nil
 	}
 	caCert, err := ioutil.ReadFile(config.GetString("grpc.ca"))
 	if err != nil {
-		glog.V(1).Infof("read ca cert file error: %v", err)
-		return nil
+		glog.V(1).Infof("read ca cert file %s error: %v", config.GetString("grpc.ca"), err)
+		return nil, nil
 	}
 	caCertPool := x509.NewCertPool()
 	caCertPool.AppendCertsFromPEM(caCert)
@ -36,7 +50,20 @@ func LoadServerTLS(config *util.ViperProxy, component string) grpc.ServerOption
 		ClientAuth:   tls.RequireAndVerifyClientCert,
 	})

-	return grpc.Creds(ta)
+	allowedCommonNames := config.GetString(component + ".allowed_commonNames")
+	allowedWildcardDomain := config.GetString("grpc.allowed_wildcard_domain")
+	if allowedCommonNames != "" || allowedWildcardDomain != "" {
+		allowedCommonNamesMap := make(map[string]bool)
+		for _, s := range strings.Split(allowedCommonNames, ",") {
+			allowedCommonNamesMap[s] = true
+		}
+		auther := Authenticator{
+			AllowedCommonNames:    allowedCommonNamesMap,
+			AllowedWildcardDomain: allowedWildcardDomain,
+		}
+		return grpc.Creds(ta), grpc.UnaryInterceptor(grpc_auth.UnaryServerInterceptor(auther.Authenticate))
+	}
+	return grpc.Creds(ta), nil
 }

 func LoadClientTLS(config *util.ViperProxy, component string) grpc.DialOption {
@ -70,3 +97,28 @@ func LoadClientTLS(config *util.ViperProxy, component string) grpc.DialOption {
 	})
 	return grpc.WithTransportCredentials(ta)
 }
+
+func (a Authenticator) Authenticate(ctx context.Context) (newCtx context.Context, err error) {
+	p, ok := peer.FromContext(ctx)
+	if !ok {
+		return ctx, status.Error(codes.Unauthenticated, "no peer found")
+	}
+
+	tlsAuth, ok := p.AuthInfo.(credentials.TLSInfo)
+	if !ok {
+		return ctx, status.Error(codes.Unauthenticated, "unexpected peer transport credentials")
+	}
+	if len(tlsAuth.State.VerifiedChains) == 0 || len(tlsAuth.State.VerifiedChains[0]) == 0 {
+		return ctx, status.Error(codes.Unauthenticated, "could not verify peer certificate")
+	}
+
+	commonName := tlsAuth.State.VerifiedChains[0][0].Subject.CommonName
+	if a.AllowedWildcardDomain != "" && strings.HasSuffix(commonName, a.AllowedWildcardDomain) {
+		return ctx, nil
+	}
+	if _, ok := a.AllowedCommonNames[commonName]; ok {
+		return ctx, nil
+	}
+
+	return ctx, status.Errorf(codes.Unauthenticated, "invalid subject common name: %s", commonName)
+}
--- a/weed/server/filer_server.go
+++ b/weed/server/filer_server.go
@ -153,7 +153,7 @@ func NewFilerServer(defaultMux, readonlyMux *http.ServeMux, option *FilerOption)
 func (fs *FilerServer) checkWithMaster() {

 	for _, master := range fs.option.Masters {
-		_, err := pb.ParseFilerGrpcAddress(master)
+		_, err := pb.ParseServerToGrpcAddress(master)
 		if err != nil {
 			glog.Fatalf("invalid master address %s: %v", master, err)
 		}
--- a/weed/server/filer_server_handlers_read.go
+++ b/weed/server/filer_server_handlers_read.go
@ -61,15 +61,7 @@ func (fs *FilerServer) GetOrHeadHandler(w http.ResponseWriter, r *http.Request,
 		return
 	}

-	if len(entry.Chunks) == 0 && len(entry.Content) == 0 {
-		glog.V(1).Infof("no file chunks for %s, attr=%+v", path, entry.Attr)
-		stats.FilerRequestCounter.WithLabelValues("read.nocontent").Inc()
-		w.WriteHeader(http.StatusNoContent)
-		return
-	}
-
 	w.Header().Set("Accept-Ranges", "bytes")
-	w.Header().Set("Last-Modified", entry.Attr.Mtime.Format(http.TimeFormat))

 	// mime type
 	mimeType := entry.Attr.Mime
@ -164,6 +156,9 @@ func (fs *FilerServer) GetOrHeadHandler(w http.ResponseWriter, r *http.Request,
 		}
 		if offset+size <= int64(len(entry.Content)) {
 			_, err := writer.Write(entry.Content[offset : offset+size])
+			if err != nil {
+				glog.Errorf("failed to write entry content: %v", err)
+			}
 			return err
 		}
 		return filer.StreamContent(fs.filer.MasterClient, writer, entry.Chunks, offset, size)
--- a/weed/server/filer_server_handlers_write_autochunk.go
+++ b/weed/server/filer_server_handlers_write_autochunk.go
@ -38,10 +38,10 @@ func (fs *FilerServer) autoChunk(ctx context.Context, w http.ResponseWriter, r *

 	chunkSize := 1024 * 1024 * maxMB

-	stats.FilerRequestCounter.WithLabelValues("postAutoChunk").Inc()
+	stats.FilerRequestCounter.WithLabelValues("chunk").Inc()
 	start := time.Now()
 	defer func() {
-		stats.FilerRequestHistogram.WithLabelValues("postAutoChunk").Observe(time.Since(start).Seconds())
+		stats.FilerRequestHistogram.WithLabelValues("chunk").Observe(time.Since(start).Seconds())
 	}()

 	var reply *FilerPostResult
@ -302,13 +302,16 @@ func (fs *FilerServer) uploadReaderToChunks(w http.ResponseWriter, r *http.Reque

 func (fs *FilerServer) doUpload(urlLocation string, w http.ResponseWriter, r *http.Request, limitedReader io.Reader, fileName string, contentType string, pairMap map[string]string, auth security.EncodedJwt) (*operation.UploadResult, error, []byte) {

-	stats.FilerRequestCounter.WithLabelValues("postAutoChunkUpload").Inc()
+	stats.FilerRequestCounter.WithLabelValues("chunkUpload").Inc()
 	start := time.Now()
 	defer func() {
-		stats.FilerRequestHistogram.WithLabelValues("postAutoChunkUpload").Observe(time.Since(start).Seconds())
+		stats.FilerRequestHistogram.WithLabelValues("chunkUpload").Observe(time.Since(start).Seconds())
 	}()

 	uploadResult, err, data := operation.Upload(urlLocation, fileName, fs.option.Cipher, limitedReader, false, contentType, pairMap, auth)
+	if uploadResult != nil && uploadResult.RetryCount > 0 {
+		stats.FilerRequestCounter.WithLabelValues("chunkUploadRetry").Add(float64(uploadResult.RetryCount))
+	}
 	return uploadResult, err, data
 }

--- a/weed/server/master_grpc_server_volume.go
+++ b/weed/server/master_grpc_server_volume.go
@ -77,7 +77,7 @@ func (ms *MasterServer) Assign(ctx context.Context, req *master_pb.AssignRequest

 	if !ms.Topo.HasWritableVolume(option) {
 		if ms.Topo.AvailableSpaceFor(option) <= 0 {
-			return nil, fmt.Errorf("no free volumes left for "+option.String())
+			return nil, fmt.Errorf("no free volumes left for " + option.String())
 		}
 		ms.vgLock.Lock()
 		if !ms.Topo.HasWritableVolume(option) {
@ -122,11 +122,8 @@ func (ms *MasterServer) Statistics(ctx context.Context, req *master_pb.Statistic

 	volumeLayout := ms.Topo.GetVolumeLayout(req.Collection, replicaPlacement, ttl, types.ToDiskType(req.DiskType))
 	stats := volumeLayout.Stats()
-
-	totalSize := ms.Topo.GetDiskUsages().GetMaxVolumeCount() * int64(ms.option.VolumeSizeLimitMB) * 1024 * 1024
-
 	resp := &master_pb.StatisticsResponse{
-		TotalSize: uint64(totalSize),
+		TotalSize: stats.TotalSize,
 		UsedSize:  stats.UsedSize,
 		FileCount: stats.FileCount,
 	}
--- a/weed/server/volume_server_tcp_handlers_write.go
+++ b/weed/server/volume_server_tcp_handlers_write.go
@ -0,0 +1,137 @@
+package weed_server
+
+import (
+	"bufio"
+	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/storage/needle"
+	"github.com/chrislusf/seaweedfs/weed/util"
+	"io"
+	"net"
+	"strings"
+)
+
+func (vs *VolumeServer) HandleTcpConnection(c net.Conn) {
+	defer c.Close()
+
+	glog.V(0).Infof("Serving writes from %s", c.RemoteAddr().String())
+
+	bufReader := bufio.NewReaderSize(c, 1024*1024)
+	bufWriter := bufio.NewWriterSize(c, 1024*1024)
+
+	for {
+		cmd, err := bufReader.ReadString('\n')
+		if err != nil {
+			if err != io.EOF {
+				glog.Errorf("read command from %s: %v", c.RemoteAddr().String(), err)
+			}
+			return
+		}
+		cmd = cmd[:len(cmd)-1]
+		switch cmd[0] {
+		case '+':
+			fileId := cmd[1:]
+			err = vs.handleTcpPut(fileId, bufReader)
+			if err == nil {
+				bufWriter.Write([]byte("+OK\n"))
+			} else {
+				bufWriter.Write([]byte("-ERR " + string(err.Error()) + "\n"))
+			}
+		case '-':
+			fileId := cmd[1:]
+			err = vs.handleTcpDelete(fileId)
+			if err == nil {
+				bufWriter.Write([]byte("+OK\n"))
+			} else {
+				bufWriter.Write([]byte("-ERR " + string(err.Error()) + "\n"))
+			}
+		case '?':
+			fileId := cmd[1:]
+			err = vs.handleTcpGet(fileId, bufWriter)
+		case '!':
+			bufWriter.Flush()
+		}
+
+	}
+
+}
+
+func (vs *VolumeServer) handleTcpGet(fileId string, writer *bufio.Writer) (err error) {
+
+	volumeId, n, err2 := vs.parseFileId(fileId)
+	if err2 != nil {
+		return err2
+	}
+
+	volume := vs.store.GetVolume(volumeId)
+	if volume == nil {
+		return fmt.Errorf("volume %d not found", volumeId)
+	}
+
+	err = volume.StreamRead(n, writer)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (vs *VolumeServer) handleTcpPut(fileId string, bufReader *bufio.Reader) (err error) {
+
+	volumeId, n, err2 := vs.parseFileId(fileId)
+	if err2 != nil {
+		return err2
+	}
+
+	volume := vs.store.GetVolume(volumeId)
+	if volume == nil {
+		return fmt.Errorf("volume %d not found", volumeId)
+	}
+
+	sizeBuf := make([]byte, 4)
+	if _, err = bufReader.Read(sizeBuf); err != nil {
+		return err
+	}
+	dataSize := util.BytesToUint32(sizeBuf)
+
+	err = volume.StreamWrite(n, bufReader, dataSize)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (vs *VolumeServer) handleTcpDelete(fileId string) (err error) {
+
+	volumeId, n, err2 := vs.parseFileId(fileId)
+	if err2 != nil {
+		return err2
+	}
+
+	_, err = vs.store.DeleteVolumeNeedle(volumeId, n)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (vs *VolumeServer) parseFileId(fileId string) (needle.VolumeId, *needle.Needle, error) {
+
+	commaIndex := strings.LastIndex(fileId, ",")
+	if commaIndex <= 0 {
+		return 0, nil, fmt.Errorf("unknown fileId %s", fileId)
+	}
+
+	vid, fid := fileId[0:commaIndex], fileId[commaIndex+1:]
+
+	volumeId, ve := needle.NewVolumeId(vid)
+	if ve != nil {
+		return 0, nil, fmt.Errorf("unknown volume id in fileId %s", fileId)
+	}
+
+	n := new(needle.Needle)
+	n.ParsePath(fid)
+	return volumeId, n, nil
+}
--- a/weed/shell/command_ec_encode.go
+++ b/weed/shell/command_ec_encode.go
@ -274,7 +274,7 @@ func collectVolumeIdsForEcEncode(commandEnv *CommandEnv, selectedCollection stri
 	quietSeconds := int64(quietPeriod / time.Second)
 	nowUnixSeconds := time.Now().Unix()

-	fmt.Printf("ec encode volumes quiet for: %d seconds\n", quietSeconds)
+	fmt.Printf("collect volumes quiet for: %d seconds\n", quietSeconds)

 	vidMap := make(map[uint32]bool)
 	eachDataNode(topologyInfo, func(dc string, rack RackId, dn *master_pb.DataNodeInfo) {
--- a/weed/shell/command_s3_clean_uploads.go
+++ b/weed/shell/command_s3_clean_uploads.go
@ -0,0 +1,92 @@
+package shell
+
+import (
+	"flag"
+	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/util"
+	"io"
+	"math"
+	"time"
+
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+)
+
+func init() {
+	Commands = append(Commands, &commandS3CleanUploads{})
+}
+
+type commandS3CleanUploads struct {
+}
+
+func (c *commandS3CleanUploads) Name() string {
+	return "s3.clean.uploads"
+}
+
+func (c *commandS3CleanUploads) Help() string {
+	return `clean up stale multipart uploads
+
+	Example:
+		s3.clean.uploads -replication 001
+
+`
+}
+
+func (c *commandS3CleanUploads) Do(args []string, commandEnv *CommandEnv, writer io.Writer) (err error) {
+
+	bucketCommand := flag.NewFlagSet(c.Name(), flag.ContinueOnError)
+	uploadedTimeAgo := bucketCommand.Duration("timeAgo", 24*time.Hour, "created time before now. \"1.5h\" or \"2h45m\". Valid time units are \"m\", \"h\"")
+	if err = bucketCommand.Parse(args); err != nil {
+		return nil
+	}
+
+	var filerBucketsPath string
+	filerBucketsPath, err = readFilerBucketsPath(commandEnv)
+	if err != nil {
+		return fmt.Errorf("read buckets: %v", err)
+	}
+
+	var buckets []string
+	err = filer_pb.List(commandEnv, filerBucketsPath, "", func(entry *filer_pb.Entry, isLast bool) error {
+		buckets = append(buckets, entry.Name)
+		return nil
+	}, "", false, math.MaxUint32)
+	if err != nil {
+		return fmt.Errorf("list buckets under %v: %v", filerBucketsPath, err)
+	}
+
+	for _, bucket:= range buckets {
+		c.cleanupUploads(commandEnv, writer, filerBucketsPath, bucket, *uploadedTimeAgo)
+	}
+
+	return err
+
+}
+
+func (c *commandS3CleanUploads) cleanupUploads(commandEnv *CommandEnv, writer io.Writer, filerBucketsPath string, bucket string, timeAgo time.Duration) error {
+	uploadsDir := filerBucketsPath+"/"+bucket+"/.uploads"
+	var staleUploads []string
+	now := time.Now()
+	err := filer_pb.List(commandEnv, uploadsDir, "", func(entry *filer_pb.Entry, isLast bool) error {
+		ctime := time.Unix(entry.Attributes.Crtime, 0)
+		if ctime.Add(timeAgo).Before(now) {
+			staleUploads = append(staleUploads, entry.Name)
+		}
+		return nil
+	}, "", false, math.MaxUint32)
+	if err != nil {
+		return fmt.Errorf("list uploads under %v: %v", uploadsDir, err)
+	}
+
+	for _, staleUpload:= range staleUploads {
+		deleteUrl := fmt.Sprintf("http://%s:%d%s/%s?recursive=true&ignoreRecursiveError=true",commandEnv.option.FilerHost, commandEnv.option.FilerPort,uploadsDir, staleUpload)
+		fmt.Fprintf(writer, "purge %s\n", deleteUrl)
+
+		err = util.Delete(deleteUrl, "")
+		if err != nil {
+			return fmt.Errorf("purge %s/%s: %v", uploadsDir, staleUpload, err)
+		}
+	}
+
+	return nil
+
+}
--- a/weed/shell/command_volume_tier_move.go
+++ b/weed/shell/command_volume_tier_move.go
@ -102,7 +102,7 @@ func doVolumeTierMove(commandEnv *CommandEnv, writer io.Writer, collection strin
 	keepDataNodesSorted(allLocations, toDiskType)
 	fn := capacityByFreeVolumeCount(toDiskType)
 	for _, dst := range allLocations {
-		if fn(dst.dataNode) > 0 {
+		if fn(dst.dataNode) > 0 && !hasFoundTarget {
 			// ask the volume server to replicate the volume
 			if isOneOf(dst.dataNode.Id, locations) {
 				continue
--- a/weed/storage/backend/backend.go
+++ b/weed/storage/backend/backend.go
@ -58,6 +58,9 @@ func LoadConfiguration(config *util.ViperProxy) {
 			if !config.GetBool(StorageBackendPrefix + "." + backendTypeName + "." + backendStorageId + ".enabled") {
 				continue
 			}
+			if _, found := BackendStorages[backendTypeName+"."+backendStorageId]; found {
+				continue
+			}
 			backendStorage, buildErr := backendStorageFactory.BuildStorage(config,
 				StorageBackendPrefix+"."+backendTypeName+"."+backendStorageId+".", backendStorageId)
 			if buildErr != nil {
@ -81,6 +84,9 @@ func LoadFromPbStorageBackends(storageBackends []*master_pb.StorageBackend) {
 			glog.Warningf("storage type %s not found", storageBackend.Type)
 			continue
 		}
+		if _, found := BackendStorages[storageBackend.Type+"."+storageBackend.Id]; found {
+			continue
+		}
 		backendStorage, buildErr := backendStorageFactory.BuildStorage(newProperties(storageBackend.Properties), "", storageBackend.Id)
 		if buildErr != nil {
 			glog.Fatalf("fail to create backend storage %s.%s", storageBackend.Type, storageBackend.Id)
--- a/weed/storage/backend/disk_file.go
+++ b/weed/storage/backend/disk_file.go
@ -52,7 +52,7 @@ func (df *DiskFile) WriteAt(p []byte, off int64) (n int, err error) {
 	return
 }

-func (df *DiskFile) Append(p []byte) (n int, err error) {
+func (df *DiskFile) Write(p []byte) (n int, err error) {
 	return df.WriteAt(p, df.fileSize)
 }

--- a/weed/storage/backend/s3_backend/s3_sessions.go
+++ b/weed/storage/backend/s3_backend/s3_sessions.go
@ -34,8 +34,9 @@ func createSession(awsAccessKeyId, awsSecretAccessKey, region, endpoint string)
 	}

 	config := &aws.Config{
-		Region:   aws.String(region),
-		Endpoint: aws.String(endpoint),
+		Region:           aws.String(region),
+		Endpoint:         aws.String(endpoint),
+		S3ForcePathStyle: aws.Bool(true),
 	}
 	if awsAccessKeyId != "" && awsSecretAccessKey != "" {
 		config.Credentials = credentials.NewStaticCredentials(awsAccessKeyId, awsSecretAccessKey, "")
--- a/weed/storage/erasure_coding/ec_volume.go
+++ b/weed/storage/erasure_coding/ec_volume.go
@ -63,7 +63,7 @@ func NewEcVolume(diskType types.DiskType, dir string, dirIdx string, collection

 	// read volume info
 	ev.Version = needle.Version3
-	if volumeInfo, found, _ := pb.MaybeLoadVolumeInfo(dataBaseFileName + ".vif"); found {
+	if volumeInfo, _, found, _ := pb.MaybeLoadVolumeInfo(dataBaseFileName + ".vif"); found {
 		ev.Version = needle.Version(volumeInfo.Version)
 	} else {
 		pb.SaveVolumeInfo(dataBaseFileName+".vif", &volume_server_pb.VolumeInfo{Version: uint32(ev.Version)})
--- a/weed/storage/needle/crc.go
+++ b/weed/storage/needle/crc.go
@ -2,6 +2,7 @@ package needle

 import (
 	"fmt"
+	"io"

 	"github.com/klauspost/crc32"

@ -29,3 +30,25 @@ func (n *Needle) Etag() string {
 	util.Uint32toBytes(bits, uint32(n.Checksum))
 	return fmt.Sprintf("%x", bits)
 }
+
+func NewCRCwriter(w io.Writer) *CRCwriter {
+
+	return &CRCwriter{
+		crc: CRC(0),
+		w: w,
+	}
+
+}
+
+type CRCwriter struct {
+	crc CRC
+	w   io.Writer
+}
+
+func (c *CRCwriter) Write(p []byte) (n int, err error) {
+	n, err = c.w.Write(p) // with each write ...
+	c.crc = c.crc.Update(p)
+	return
+}
+
+func (c *CRCwriter) Sum() uint32 { return c.crc.Value() } // final hash
--- a/weed/storage/needle/needle_read_write.go
+++ b/weed/storage/needle/needle_read_write.go
@ -168,7 +168,7 @@ func ReadNeedleBlob(r backend.BackendStorageFile, offset int64, size Size, versi
 	}
 	if err != nil {
 		fileSize, _, _ := r.GetStat()
-		println("n",n, "dataSize", dataSize, "offset", offset, "fileSize", fileSize)
+		println("n", n, "dataSize", dataSize, "offset", offset, "fileSize", fileSize)
 	}
 	return dataSlice, err

--- a/weed/storage/needle_map_leveldb.go
+++ b/weed/storage/needle_map_leveldb.go
@ -152,8 +152,10 @@ func (m *LevelDbNeedleMap) Close() {
 		glog.Warningf("close index file %s failed: %v", indexFileName, err)
 	}

-	if err := m.db.Close(); err != nil {
-		glog.Warningf("close levelDB failed: %v", err)
+	if m.db != nil {
+		if err := m.db.Close(); err != nil {
+			glog.Warningf("close levelDB failed: %v", err)
+		}
 	}
 }

--- a/weed/storage/needle_map_sorted_file.go
+++ b/weed/storage/needle_map_sorted_file.go
@ -94,8 +94,12 @@ func (m *SortedFileNeedleMap) Delete(key NeedleId, offset Offset) error {
 }

 func (m *SortedFileNeedleMap) Close() {
-	m.indexFile.Close()
-	m.dbFile.Close()
+	if m.indexFile != nil {
+		m.indexFile.Close()
+	}
+	if m.dbFile != nil {
+		m.dbFile.Close()
+	}
 }

 func (m *SortedFileNeedleMap) Destroy() error {
--- a/weed/storage/store.go
+++ b/weed/storage/store.go
@ -220,20 +220,30 @@ func (s *Store) CollectHeartbeat() *master_pb.Heartbeat {
 			if maxFileKey < curMaxFileKey {
 				maxFileKey = curMaxFileKey
 			}
+			deleteVolume := false
 			if !v.expired(volumeMessage.Size, s.GetVolumeSizeLimit()) {
 				volumeMessages = append(volumeMessages, volumeMessage)
 			} else {
 				if v.expiredLongEnough(MAX_TTL_VOLUME_REMOVAL_DELAY) {
 					deleteVids = append(deleteVids, v.Id)
+					deleteVolume = true
 				} else {
 					glog.V(0).Infof("volume %d is expired", v.Id)
 				}
 				if v.lastIoError != nil {
 					deleteVids = append(deleteVids, v.Id)
+					deleteVolume = true
 					glog.Warningf("volume %d has IO error: %v", v.Id, v.lastIoError)
 				}
 			}
-			collectionVolumeSize[v.Collection] += volumeMessage.Size
+
+			if _, exist := collectionVolumeSize[v.Collection]; !exist {
+				collectionVolumeSize[v.Collection] = 0
+			}
+			if !deleteVolume {
+				collectionVolumeSize[v.Collection] += volumeMessage.Size
+			}
+
 			if _, exist := collectionVolumeReadOnlyCount[v.Collection]; !exist {
 				collectionVolumeReadOnlyCount[v.Collection] = map[string]uint8{
 					"IsReadOnly":       0,
@ -242,7 +252,7 @@ func (s *Store) CollectHeartbeat() *master_pb.Heartbeat {
 					"isDiskSpaceLow":   0,
 				}
 			}
-			if v.IsReadOnly() {
+			if !deleteVolume && v.IsReadOnly() {
 				collectionVolumeReadOnlyCount[v.Collection]["IsReadOnly"] += 1
 				if v.noWriteOrDelete {
 					collectionVolumeReadOnlyCount[v.Collection]["noWriteOrDelete"] += 1
@ -267,7 +277,7 @@ func (s *Store) CollectHeartbeat() *master_pb.Heartbeat {
 						glog.V(0).Infof("volume %d is deleted", vid)
 					}
 				} else {
-					glog.V(0).Infof("delete volume %d: %v", vid, err)
+					glog.Warningf("delete volume %d: %v", vid, err)
 				}
 			}
 			location.volumesLock.Unlock()
@ -446,7 +456,7 @@ func (s *Store) ConfigureVolume(i needle.VolumeId, replication string) error {
 		// load, modify, save
 		baseFileName := strings.TrimSuffix(fileInfo.Name(), filepath.Ext(fileInfo.Name()))
 		vifFile := filepath.Join(location.Directory, baseFileName+".vif")
-		volumeInfo, _, err := pb.MaybeLoadVolumeInfo(vifFile)
+		volumeInfo, _, _, err := pb.MaybeLoadVolumeInfo(vifFile)
 		if err != nil {
 			return fmt.Errorf("volume %d fail to load vif", i)
 		}
--- a/weed/storage/super_block/replica_placement.go
+++ b/weed/storage/super_block/replica_placement.go
@ -36,6 +36,9 @@ func NewReplicaPlacementFromByte(b byte) (*ReplicaPlacement, error) {
 }

 func (rp *ReplicaPlacement) Byte() byte {
+	if rp == nil {
+		return 0
+	}
 	ret := rp.DiffDataCenterCount*100 + rp.DiffRackCount*10 + rp.SameRackCount
 	return byte(ret)
 }
--- a/weed/storage/volume_loading.go
+++ b/weed/storage/volume_loading.go
@ -39,12 +39,12 @@ func (v *Volume) load(alsoLoadIndex bool, createDatIfMissing bool, needleMapKind
 		}
 	}()

-	hasVolumeInfoFile := v.maybeLoadVolumeInfo() && v.volumeInfo.Version != 0
+	hasVolumeInfoFile := v.maybeLoadVolumeInfo()

 	if v.HasRemoteFile() {
 		v.noWriteCanDelete = true
 		v.noWriteOrDelete = false
-		glog.V(0).Infof("loading volume %d from remote %v", v.Id, v.volumeInfo.Files)
+		glog.V(0).Infof("loading volume %d from remote %v", v.Id, v.volumeInfo)
 		v.LoadRemoteFile()
 		alreadyHasSuperBlock = true
 	} else if exists, canRead, canWrite, modifiedTime, fileSize := util.CheckFile(v.FileName(".dat")); exists {
@ -83,6 +83,12 @@ func (v *Volume) load(alsoLoadIndex bool, createDatIfMissing bool, needleMapKind

 	if alreadyHasSuperBlock {
 		err = v.readSuperBlock()
+		glog.V(0).Infof("readSuperBlock volume %d version %v", v.Id, v.SuperBlock.Version)
+		if v.HasRemoteFile() {
+			// maybe temporary network problem
+			glog.Errorf("readSuperBlock remote volume %d: %v", v.Id, err)
+			err = nil
+		}
 	} else {
 		if !v.SuperBlock.Initialized() {
 			return fmt.Errorf("volume %s not initialized", v.FileName(".dat"))
--- a/weed/storage/volume_read_write.go
+++ b/weed/storage/volume_read_write.go
@ -104,47 +104,8 @@ func (v *Volume) syncWrite(n *needle.Needle) (offset uint64, size Size, isUnchan
 		err = fmt.Errorf("volume size limit %d exceeded! current size is %d", MaxPossibleVolumeSize, v.nm.ContentSize())
 		return
 	}
-	if v.isFileUnchanged(n) {
-		size = Size(n.DataSize)
-		isUnchanged = true
-		return
-	}

-	// check whether existing needle cookie matches
-	nv, ok := v.nm.Get(n.Id)
-	if ok {
-		existingNeedle, _, _, existingNeedleReadErr := needle.ReadNeedleHeader(v.DataBackend, v.Version(), nv.Offset.ToActualOffset())
-		if existingNeedleReadErr != nil {
-			err = fmt.Errorf("reading existing needle: %v", existingNeedleReadErr)
-			return
-		}
-		if existingNeedle.Cookie != n.Cookie {
-			glog.V(0).Infof("write cookie mismatch: existing %x, new %x", existingNeedle.Cookie, n.Cookie)
-			err = fmt.Errorf("mismatching cookie %x", n.Cookie)
-			return
-		}
-	}
-
-	// append to dat file
-	n.AppendAtNs = uint64(time.Now().UnixNano())
-	offset, size, _, err = n.Append(v.DataBackend, v.Version())
-	v.checkReadWriteError(err)
-	if err != nil {
-		return
-	}
-
-	v.lastAppendAtNs = n.AppendAtNs
-
-	// add to needle map
-	if !ok || uint64(nv.Offset.ToActualOffset()) < offset {
-		if err = v.nm.Put(n.Id, ToOffset(int64(offset)), n.Size); err != nil {
-			glog.V(4).Infof("failed to save in needle map %d: %v", n.Id, err)
-		}
-	}
-	if v.lastModifiedTsSeconds < n.LastModified {
-		v.lastModifiedTsSeconds = n.LastModified
-	}
-	return
+	return v.doWriteRequest(n)
 }

 func (v *Volume) writeNeedle2(n *needle.Needle, fsync bool) (offset uint64, size Size, isUnchanged bool, err error) {
@ -223,24 +184,7 @@ func (v *Volume) syncDelete(n *needle.Needle) (Size, error) {
 		return 0, err
 	}

-	nv, ok := v.nm.Get(n.Id)
-	// fmt.Println("key", n.Id, "volume offset", nv.Offset, "data_size", n.Size, "cached size", nv.Size)
-	if ok && nv.Size.IsValid() {
-		size := nv.Size
-		n.Data = nil
-		n.AppendAtNs = uint64(time.Now().UnixNano())
-		offset, _, _, err := n.Append(v.DataBackend, v.Version())
-		v.checkReadWriteError(err)
-		if err != nil {
-			return size, err
-		}
-		v.lastAppendAtNs = n.AppendAtNs
-		if err = v.nm.Delete(n.Id, ToOffset(int64(offset))); err != nil {
-			return size, err
-		}
-		return size, err
-	}
-	return 0, nil
+	return v.doDeleteRequest(n)
 }

 func (v *Volume) deleteNeedle2(n *needle.Needle) (Size, error) {
--- a/weed/storage/volume_stream_write.go
+++ b/weed/storage/volume_stream_write.go
@ -0,0 +1,104 @@
+package storage
+
+import (
+	"bufio"
+	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/util"
+	"io"
+	"time"
+
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/storage/backend"
+	"github.com/chrislusf/seaweedfs/weed/storage/needle"
+	. "github.com/chrislusf/seaweedfs/weed/storage/types"
+)
+
+func (v *Volume) StreamWrite(n *needle.Needle, data io.Reader, dataSize uint32) (err error) {
+
+	v.dataFileAccessLock.Lock()
+	defer v.dataFileAccessLock.Unlock()
+
+	df, ok := v.DataBackend.(*backend.DiskFile)
+	if !ok {
+		return fmt.Errorf("unexpected volume backend")
+	}
+	offset, _, _ := v.DataBackend.GetStat()
+
+	header := make([]byte, NeedleHeaderSize+TimestampSize) // adding timestamp to reuse it and avoid extra allocation
+	CookieToBytes(header[0:CookieSize], n.Cookie)
+	NeedleIdToBytes(header[CookieSize:CookieSize+NeedleIdSize], n.Id)
+	n.Size = 4 + Size(dataSize) + 1
+	SizeToBytes(header[CookieSize+NeedleIdSize:CookieSize+NeedleIdSize+SizeSize], n.Size)
+
+	n.DataSize = dataSize
+
+	// needle header
+	df.Write(header[0:NeedleHeaderSize])
+
+	// data size and data
+	util.Uint32toBytes(header[0:4], n.DataSize)
+	df.Write(header[0:4])
+	// write and calculate CRC
+	crcWriter := needle.NewCRCwriter(df)
+	io.Copy(crcWriter, io.LimitReader(data, int64(dataSize)))
+
+	// flags
+	util.Uint8toBytes(header[0:1], n.Flags)
+	df.Write(header[0:1])
+
+	// data checksum
+	util.Uint32toBytes(header[0:needle.NeedleChecksumSize], crcWriter.Sum())
+	// write timestamp, padding
+	n.AppendAtNs = uint64(time.Now().UnixNano())
+	util.Uint64toBytes(header[needle.NeedleChecksumSize:needle.NeedleChecksumSize+TimestampSize], n.AppendAtNs)
+	padding := needle.PaddingLength(n.Size, needle.Version3)
+	df.Write(header[0 : needle.NeedleChecksumSize+TimestampSize+padding])
+
+	// add to needle map
+	if err = v.nm.Put(n.Id, ToOffset(int64(offset)), n.Size); err != nil {
+		glog.V(4).Infof("failed to save in needle map %d: %v", n.Id, err)
+	}
+	return
+}
+
+func (v *Volume) StreamRead(n *needle.Needle, writer io.Writer) (err error) {
+
+	v.dataFileAccessLock.Lock()
+	defer v.dataFileAccessLock.Unlock()
+
+	nv, ok := v.nm.Get(n.Id)
+	if !ok || nv.Offset.IsZero() {
+		return ErrorNotFound
+	}
+
+	sr := &StreamReader{
+		readerAt: v.DataBackend,
+		offset: nv.Offset.ToActualOffset(),
+	}
+	bufReader := bufio.NewReader(sr)
+	bufReader.Discard(NeedleHeaderSize)
+	sizeBuf := make([]byte, 4)
+	bufReader.Read(sizeBuf)
+	if _, err = writer.Write(sizeBuf); err != nil {
+		return err
+	}
+	dataSize := util.BytesToUint32(sizeBuf)
+
+	_, err = io.Copy(writer, io.LimitReader(bufReader, int64(dataSize)))
+
+	return
+}
+
+type StreamReader struct {
+	offset   int64
+	readerAt io.ReaderAt
+}
+
+func (sr *StreamReader) Read(p []byte) (n int, err error) {
+	n, err = sr.readerAt.ReadAt(p, sr.offset)
+	if err != nil {
+		return
+	}
+	sr.offset += int64(n)
+	return
+}
--- a/Show more
+++ b/Show more