2.52

locks for data racing
limits concurrent uploads for one file
2026-10-01 20:26:27 +00:00 · 2021-06-07 12:13:23 -07:00 · 2021-06-07 12:04:50 -07:00 · 2021-06-06 23:05:17 -07:00 · 2021-06-06 22:16:32 -07:00 · 2021-06-06 21:54:00 -07:00
177 changed files with 3388 additions and 1012 deletions
@@ -0,0 +1,114 @@
+name: Build Latest Containers
+on:
+  push:
+    branches:
+      - master
+  workflow_dispatch: []
+
+jobs:
+  build-latest:
+    runs-on: [ubuntu-latest]
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v2
+      -
+        name: Docker meta
+        id: docker_meta
+        uses: crazy-max/ghaction-docker-meta@v2
+        with:
+          images: |
+            chrislusf/seaweedfs
+            ghcr.io/chrislusf/seaweedfs
+          tags: |
+            type=raw,value=latest
+          labels: |
+            org.opencontainers.image.title=seaweedfs
+            org.opencontainers.image.vendor=Chris Lu
+      -
+        name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+        with:
+          buildkitd-flags: "--debug"
+      -
+        name: Login to Docker Hub
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+      -
+        name: Login to GHCR
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ secrets.GHCR_USERNAME }}
+          password: ${{ secrets.GHCR_TOKEN }}
+      -
+        name: Build
+        uses: docker/build-push-action@v2
+        with:
+          context: ./docker
+          push: ${{ github.event_name != 'pull_request' }}
+          file: ./docker/Dockerfile
+          platforms: linux/amd64
+          tags: ${{ steps.docker_meta.outputs.tags }}
+          labels: ${{ steps.docker_meta.outputs.labels }}
+
+  build-dev:
+    runs-on: [ubuntu-latest]
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v2
+      -
+        name: Docker meta
+        id: docker_meta
+        uses: crazy-max/ghaction-docker-meta@v2
+        with:
+          images: |
+            chrislusf/seaweedfs
+            ghcr.io/chrislusf/seaweedfs
+          tags: |
+            type=raw,value=dev
+          labels: |
+            org.opencontainers.image.title=seaweedfs
+            org.opencontainers.image.description=SeaweedFS is a distributed storage system for blobs, objects, files, and data lake, to store and serve billions of files fast!
+            org.opencontainers.image.vendor=Chris Lu
+      -
+        name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+        with:
+          buildkitd-flags: "--debug"
+      -
+        name: Login to Docker Hub
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+      -
+        name: Login to GHCR
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ secrets.GHCR_USERNAME }}
+          password: ${{ secrets.GHCR_TOKEN }}
+      -
+        name: Build
+        uses: docker/build-push-action@v2
+        with:
+          context: ./docker
+          push: ${{ github.event_name != 'pull_request' }}
+          file: ./docker/Dockerfile.go_build
+          platforms: linux/amd64
+          tags: ${{ steps.docker_meta.outputs.tags }}
+          labels: ${{ steps.docker_meta.outputs.labels }}
@@ -0,0 +1,118 @@
+name: Build Release Containers
+on:
+  push:
+    tags:
+      - '*'
+  workflow_dispatch: []
+
+jobs:
+  build-default:
+    runs-on: [ubuntu-latest]
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v2
+      -
+        name: Docker meta
+        id: docker_meta
+        uses: crazy-max/ghaction-docker-meta@v2
+        with:
+          images: |
+            chrislusf/seaweedfs
+            ghcr.io/chrislusf/seaweedfs
+          tags: |
+            type=ref,event=tag
+          flavor: |
+            latest=false
+          labels: |
+            org.opencontainers.image.title=seaweedfs
+            org.opencontainers.image.description=SeaweedFS is a distributed storage system for blobs, objects, files, and data lake, to store and serve billions of files fast!
+            org.opencontainers.image.vendor=Chris Lu
+      -
+        name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+        with:
+          buildkitd-flags: "--debug"
+      -
+        name: Login to Docker Hub
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+      -
+        name: Login to GHCR
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ secrets.GHCR_USERNAME }}
+          password: ${{ secrets.GHCR_TOKEN }}
+      -
+        name: Build
+        uses: docker/build-push-action@v2
+        with:
+          context: ./docker
+          push: ${{ github.event_name != 'pull_request' }}
+          file: ./docker/Dockerfile.go_build
+          platforms: linux/amd64
+          tags: ${{ steps.docker_meta.outputs.tags }}
+          labels: ${{ steps.docker_meta.outputs.labels }}
+  build-large:
+    runs-on: [ubuntu-latest]
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v2
+      -
+        name: Docker meta
+        id: docker_meta
+        uses: crazy-max/ghaction-docker-meta@v2
+        with:
+          images: |
+            chrislusf/seaweedfs
+            ghcr.io/chrislusf/seaweedfs
+          tags: |
+            type=ref,event=tag,suffix=_large_disk
+          flavor: |
+            latest=false
+          labels: |
+            org.opencontainers.image.title=seaweedfs
+            org.opencontainers.image.description=SeaweedFS is a distributed storage system for blobs, objects, files, and data lake, to store and serve billions of files fast!
+            org.opencontainers.image.vendor=Chris Lu
+      -
+        name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+        with:
+          buildkitd-flags: "--debug"
+      -
+        name: Login to Docker Hub
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+      -
+        name: Login to GHCR
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ secrets.GHCR_USERNAME }}
+          password: ${{ secrets.GHCR_TOKEN }}
+      -
+        name: Build
+        uses: docker/build-push-action@v2
+        with:
+          context: ./docker
+          push: ${{ github.event_name != 'pull_request' }}
+          file: ./docker/Dockerfile.go_build_large
+          platforms: linux/amd64
+          tags: ${{ steps.docker_meta.outputs.tags }}
+          labels: ${{ steps.docker_meta.outputs.labels }}
@@ -33,8 +33,9 @@ jobs:
        run: echo BUILD_TIME=$(date -u +%Y-%m-%d-%H-%M) >> ${GITHUB_ENV}

      - name: Go Release Binaries
-        uses: wangyoucao577/go-release-action@v1.14
+        uses: wangyoucao577/go-release-action@v1.17
        with:
+          goversion: 1.16
          github_token: ${{ secrets.GITHUB_TOKEN }}
          goos: ${{ matrix.goos }}
          goarch: ${{ matrix.goarch }}
@@ -49,8 +50,9 @@ jobs:
          asset_name: "weed-large-disk-${{ env.BUILD_TIME }}-${{ matrix.goos }}-${{ matrix.goarch }}"

      - name: Go Release Binaries
-        uses: wangyoucao577/go-release-action@v1.14
+        uses: wangyoucao577/go-release-action@v1.17
        with:
+          goversion: 1.16
          github_token: ${{ secrets.GITHUB_TOKEN }}
          goos: ${{ matrix.goos }}
          goarch: ${{ matrix.goarch }}
@@ -1,7 +1,6 @@
 sudo: false
 language: go
 go:
-  - 1.15.x
  - 1.16.x

 before_install:
@@ -6,7 +6,7 @@
 [![Build Status](https://travis-ci.org/chrislusf/seaweedfs.svg?branch=master)](https://travis-ci.org/chrislusf/seaweedfs)
 [![GoDoc](https://godoc.org/github.com/chrislusf/seaweedfs/weed?status.svg)](https://godoc.org/github.com/chrislusf/seaweedfs/weed)
 [![Wiki](https://img.shields.io/badge/docs-wiki-blue.svg)](https://github.com/chrislusf/seaweedfs/wiki)
-[![Docker Pulls](https://img.shields.io/docker/pulls/chrislusf/seaweedfs.svg?maxAge=4800)](https://hub.docker.com/r/chrislusf/seaweedfs/)
+[![Docker Pulls](https://img.shields.io/docker/pulls/chrislusf/seaweedfs?maxAge=4800)](https://hub.docker.com/r/chrislusf/seaweedfs/)
 [![SeaweedFS on Maven Central](https://img.shields.io/maven-central/v/com.github.chrislusf/seaweedfs-client)](https://search.maven.org/search?q=g:com.github.chrislusf)


@@ -44,7 +44,8 @@ Your support will be really appreciated by me and other supporters!
 - [SeaweedFS Mailing List](https://groups.google.com/d/forum/seaweedfs)
 - [Wiki Documentation](https://github.com/chrislusf/seaweedfs/wiki)
 - [SeaweedFS White Paper](https://github.com/chrislusf/seaweedfs/wiki/SeaweedFS_Architecture.pdf)
- [SeaweedFS Introduction Slides](https://www.slideshare.net/chrislusf/seaweedfs-introduction)
+- [SeaweedFS Introduction Slides 2021.5](https://docs.google.com/presentation/d/1DcxKWlINc-HNCjhYeERkpGXXm6nTCES8mi2W5G0Z4Ts/edit?usp=sharing)
+- [SeaweedFS Introduction Slides 2019.3](https://www.slideshare.net/chrislusf/seaweedfs-introduction)

 Table of Contents
 =================
@@ -68,12 +69,16 @@ Table of Contents
 * [License](#license)


-## Quick Start ##
+## Quick Start with single binary ##
 * Download the latest binary from https://github.com/chrislusf/seaweedfs/releases and unzip a single binary file `weed` or `weed.exe`
 * Run `weed server -dir=/some/data/dir -s3` to start one master, one volume server, one filer, and one S3 gateway.

 Also, to increase capacity, just add more volume servers by running `weed volume -dir="/some/data/dir2" -mserver="<master_host>:9333" -port=8081` locally, or on a different machine, or on thousands of machines. That is it!

+## Quick Start for S3 API on Docker ##
+
+`docker run -p 8333:8333 chrislusf/seaweedfs server -s3`
+
 ## Introduction ##

 SeaweedFS is a simple and highly scalable distributed file system. There are two objectives:
@@ -88,13 +93,6 @@ 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!
-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.

@@ -104,12 +102,18 @@ Also, SeaweedFS implements erasure coding with ideas from

 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.
+e.g., MySql, Postgres, Redis, Cassandra, HBase, Mongodb, Elastic Search, LevelDB, RocksDB, Sqlite, 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].

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

 ## Additional Features ##
@@ -395,7 +399,7 @@ The architectures are mostly the same. SeaweedFS aims to store and read files fa

 * SeaweedFS optimizes for small files, ensuring O(1) disk seek operation, and can also handle large files.
 * SeaweedFS statically assigns a volume id for a file. Locating file content becomes just a lookup of the volume id, which can be easily cached.
-* SeaweedFS Filer metadata store can be any well-known and proven data stores, e.g., Redis, Cassandra, HBase, Mongodb, Elastic Search, MySql, Postgres, MemSql, TiDB, CockroachDB, Etcd etc, and is easy to customized.
+* SeaweedFS Filer metadata store can be any well-known and proven data stores, e.g., Redis, Cassandra, HBase, Mongodb, Elastic Search, MySql, Postgres, Sqlite, MemSql, TiDB, CockroachDB, Etcd etc, and is easy to customized.
 * SeaweedFS Volume server also communicates directly with clients via HTTP, supporting range queries, direct uploads, etc.

 | System         | File Metadata                   | File Content Read| POSIX  | REST API | Optimized for large number of small files |
@@ -433,11 +437,11 @@ SeaweedFS has a centralized master group to look up free volumes, while Ceph use

 Same as SeaweedFS, Ceph is also based on the object store RADOS. Ceph is rather complicated with mixed reviews.

-Ceph uses CRUSH hashing to automatically manage the data placement, which is efficient to locate the data. But the data has to be placed according to the CRUSH algorithm. Any wrong configuration would cause data loss. SeaweedFS places data by assigning them to any writable volumes. If writes to one volume failed, just pick another volume to write. Adding more volumes are also as simple as it can be.
+Ceph uses CRUSH hashing to automatically manage the data placement, which is efficient to locate the data. But the data has to be placed according to the CRUSH algorithm. Any wrong configuration would cause data loss. Topology changes, such as adding new servers to increase capacity, will cause data migration with high IO cost to fit the CRUSH algorithm. SeaweedFS places data by assigning them to any writable volumes. If writes to one volume failed, just pick another volume to write. Adding more volumes are also as simple as it can be.

 SeaweedFS is optimized for small files. Small files are stored as one continuous block of content, with at most 8 unused bytes between files. Small file access is O(1) disk read.

-SeaweedFS Filer uses off-the-shelf stores, such as MySql, Postgres, Mongodb, Redis, Elastic Search, Cassandra, HBase, MemSql, TiDB, CockroachCB, Etcd, to manage file directories. These stores are proven, scalable, and easier to manage.
+SeaweedFS Filer uses off-the-shelf stores, such as MySql, Postgres, Sqlite, Mongodb, Redis, Elastic Search, Cassandra, HBase, MemSql, TiDB, CockroachCB, Etcd, to manage file directories. These stores are proven, scalable, and easier to manage.

 | SeaweedFS         | comparable to Ceph | advantage |
 | -------------  | ------------- | ---------------- |
@@ -1,6 +1,7 @@
 FROM alpine

-ARG RELEASE=latest # 'latest' or 'dev'
+# 'latest' or 'dev'
+ARG RELEASE=latest

 RUN \
    ARCH=$(if [ $(uname -m) == "x86_64" ] && [ $(getconf LONG_BIT) == "64" ]; then echo "amd64"; \
@@ -1,5 +1,5 @@
-FROM frolvlad/alpine-glibc as builder
-RUN apk add git go g++ fuse
+FROM amd64/golang:1.16-alpine as builder
+RUN apk add git g++ fuse
 RUN mkdir -p /go/src/github.com/chrislusf/
 RUN git clone https://github.com/chrislusf/seaweedfs /go/src/github.com/chrislusf/seaweedfs
 ARG BRANCH=${BRANCH:-master}
@@ -10,7 +10,7 @@ RUN cd /go/src/github.com/chrislusf/seaweedfs/weed \

 FROM alpine AS final
 LABEL author="Chris Lu"
-COPY --from=builder /root/go/bin/weed /usr/bin/
+COPY --from=builder /go/bin/weed /usr/bin/
 RUN mkdir -p /etc/seaweedfs
 COPY --from=builder /go/src/github.com/chrislusf/seaweedfs/docker/filer.toml /etc/seaweedfs/filer.toml
 COPY --from=builder /go/src/github.com/chrislusf/seaweedfs/docker/entrypoint.sh /entrypoint.sh
@@ -1,5 +1,5 @@
-FROM frolvlad/alpine-glibc as builder
-RUN apk add git go g++ fuse
+FROM amd64/golang:1.16-alpine as builder
+RUN apk add git g++ fuse
 RUN mkdir -p /go/src/github.com/chrislusf/
 RUN git clone https://github.com/chrislusf/seaweedfs /go/src/github.com/chrislusf/seaweedfs
 ARG BRANCH=${BRANCH:-master}
@@ -10,7 +10,7 @@ RUN cd /go/src/github.com/chrislusf/seaweedfs/weed \

 FROM alpine AS final
 LABEL author="Chris Lu"
-COPY --from=builder /root/go/bin/weed /usr/bin/
+COPY --from=builder /go/bin/weed /usr/bin/
 RUN mkdir -p /etc/seaweedfs
 COPY --from=builder /go/src/github.com/chrislusf/seaweedfs/docker/filer.toml /etc/seaweedfs/filer.toml
 COPY --from=builder /go/src/github.com/chrislusf/seaweedfs/docker/entrypoint.sh /entrypoint.sh
@@ -5,7 +5,9 @@ all: gen
 gen: dev

 binary:
-	cd ../weed; CGO_ENABLED=0 GOOS=linux go build -ldflags "-extldflags -static"; mv weed ../docker/
+	export SWCOMMIT=$(shell git rev-parse --short HEAD)
+	export SWLDFLAGS="-X github.com/chrislusf/seaweedfs/weed/util.COMMIT=$(SWCOMMIT)"
+	cd ../weed; CGO_ENABLED=0 GOOS=linux go build -ldflags "-extldflags -static $(SWLDFLAGS)"; mv weed ../docker/

 build: binary
 	docker build --no-cache -t chrislusf/seaweedfs:local -f Dockerfile.local .
@@ -38,7 +38,7 @@ services:
  mount_2:
    image: chrislusf/seaweedfs:local
    privileged: true
-    entrypoint: '/bin/sh -c "mkdir -p t2 && mkdir -p cache/t2 && weed -v=4  mount -filer=filer:8888 -cacheDir=./cache/t2 -dir=./t2 -filer.path=/c1 -volumeServerAcess=publicUrl"'
+    entrypoint: '/bin/sh -c "mkdir -p t2 && mkdir -p cache/t2 && weed -v=4  mount -filer=filer:8888 -cacheDir=./cache/t2 -dir=./t2 -filer.path=/c1"'
    depends_on:
      - master
      - volume
@@ -40,7 +40,7 @@ services:
      - fuse
    volumes:
      - /Volumes/mobile_disk/99:/data
-    entrypoint: '/bin/sh -c "mkdir -p t1 && weed mount -filer=filer:8888 -dir=./t1 -cacheCapacityMB=0 -memprofile=/data/mount.mem.pprof"'
+    entrypoint: '/bin/sh -c "mkdir -p t1 && weed -v=4 mount -filer=filer:8888 -dir=./t1 -cacheCapacityMB=0 -memprofile=/data/mount.mem.pprof"'
    depends_on:
      - master
      - volume
@@ -38,7 +38,7 @@ services:
      S3TEST_CONF: "s3tests.conf"
      NOSETESTS_OPTIONS: "--verbose --logging-level=ERROR --with-xunit --failure-detail s3tests_boto3.functional.test_s3"
      NOSETESTS_ATTR: "!tagging,!fails_on_aws,!encryption,!bucket-policy,!versioning,!fails_on_rgw,!bucket-policy,!fails_with_subdomain,!policy_status,!object-lock,!lifecycle,!cors,!user-policy"
-      NOSETESTS_EXCLUDE: "(bucket_list_delimiter_basic|bucket_listv2_delimiter_basic|bucket_listv2_encoding_basic|bucket_list_encoding_basic|bucket_list_delimiter_prefix|bucket_listv2_delimiter_prefix_ends_with_delimiter|bucket_list_delimiter_prefix_ends_with_delimiter|bucket_list_delimiter_alt|bucket_listv2_delimiter_alt|bucket_list_delimiter_prefix_underscore|bucket_list_delimiter_percentage|bucket_listv2_delimiter_percentage|bucket_list_delimiter_whitespace|bucket_listv2_delimiter_whitespace|bucket_list_delimiter_dot|bucket_listv2_delimiter_dot|bucket_list_delimiter_unreadable|bucket_listv2_delimiter_unreadable|bucket_listv2_fetchowner_defaultempty|bucket_listv2_fetchowner_empty|bucket_list_prefix_delimiter_alt|bucket_listv2_prefix_delimiter_alt|bucket_list_prefix_delimiter_prefix_not_exist|bucket_listv2_prefix_delimiter_prefix_not_exist|bucket_list_prefix_delimiter_delimiter_not_exist|bucket_listv2_prefix_delimiter_delimiter_not_exist|bucket_list_prefix_delimiter_prefix_delimiter_not_exist|bucket_listv2_prefix_delimiter_prefix_delimiter_not_exist|bucket_list_maxkeys_none|bucket_listv2_maxkeys_none|bucket_list_maxkeys_invalid|bucket_listv2_continuationtoken_empty|bucket_list_return_data|bucket_list_objects_anonymous|bucket_listv2_objects_anonymous|bucket_notexist|bucketv2_notexist|bucket_delete_nonempty|bucket_concurrent_set_canned_acl|object_write_to_nonexist_bucket|object_requestid_matches_header_on_error|object_write_cache_control|object_write_expires|object_set_get_metadata_none_to_good|object_set_get_metadata_none_to_empty|object_set_get_metadata_overwrite_to_empty|post_object_anonymous_request|post_object_authenticated_request|post_object_authenticated_no_content_type|post_object_authenticated_request_bad_access_key|post_object_set_success_code|post_object_set_invalid_success_code|post_object_upload_larger_than_chunk|post_object_set_key_from_filename|post_object_ignored_header|post_object_case_insensitive_condition_fields|post_object_escaped_field_values|post_object_success_redirect_action|post_object_invalid_signature|post_object_invalid_access_key|post_object_missing_policy_condition|post_object_user_specified_header|post_object_request_missing_policy_specified_field|post_object_expired_policy|post_object_invalid_request_field_value|get_object_ifmatch_failed|get_object_ifunmodifiedsince_good|put_object_ifmatch_failed|object_raw_get_bucket_gone|object_delete_key_bucket_gone|object_raw_get_bucket_acl|object_raw_get_object_acl|object_raw_response_headers|object_raw_authenticated_bucket_gone|object_raw_get_x_amz_expires_out_max_range|object_raw_get_x_amz_expires_out_positive_range|object_anon_put_write_access|object_raw_put_authenticated_expired|bucket_create_exists|bucket_create_naming_bad_short_one|bucket_create_naming_bad_short_two|bucket_get_location|bucket_acl_default|bucket_acl_canned|bucket_acl_canned_publicreadwrite|bucket_acl_canned_authenticatedread|object_acl_default|object_acl_canned_during_create|object_acl_canned|object_acl_canned_publicreadwrite|object_acl_canned_authenticatedread|object_acl_canned_bucketownerread|object_acl_canned_bucketownerfullcontrol|object_acl_full_control_verify_attributes|bucket_acl_canned_private_to_private|bucket_acl_grant_nonexist_user|bucket_acl_no_grants|bucket_acl_grant_email_not_exist|bucket_acl_revoke_all|bucket_recreate_not_overriding|object_copy_verify_contenttype|object_copy_to_itself_with_metadata|object_copy_not_owned_bucket|object_copy_not_owned_object_bucket|object_copy_retaining_metadata|object_copy_replacing_metadata|multipart_upload_empty|multipart_copy_invalid_range|multipart_copy_special_names|multipart_upload_resend_part|multipart_upload_size_too_small|abort_multipart_upload_not_found|multipart_upload_missing_part|multipart_upload_incorrect_etag|100_continue|ranged_request_invalid_range|ranged_request_empty_object|access_bucket)"
+      NOSETESTS_EXCLUDE: "(bucket_list_delimiter_basic|bucket_listv2_delimiter_basic|bucket_listv2_encoding_basic|bucket_list_encoding_basic|bucket_list_delimiter_prefix|bucket_listv2_delimiter_prefix_ends_with_delimiter|bucket_list_delimiter_prefix_ends_with_delimiter|bucket_list_delimiter_alt|bucket_listv2_delimiter_alt|bucket_list_delimiter_prefix_underscore|bucket_list_delimiter_percentage|bucket_listv2_delimiter_percentage|bucket_list_delimiter_whitespace|bucket_listv2_delimiter_whitespace|bucket_list_delimiter_dot|bucket_listv2_delimiter_dot|bucket_list_delimiter_unreadable|bucket_listv2_delimiter_unreadable|bucket_listv2_fetchowner_defaultempty|bucket_listv2_fetchowner_empty|bucket_list_prefix_delimiter_alt|bucket_listv2_prefix_delimiter_alt|bucket_list_prefix_delimiter_prefix_not_exist|bucket_listv2_prefix_delimiter_prefix_not_exist|bucket_list_prefix_delimiter_delimiter_not_exist|bucket_listv2_prefix_delimiter_delimiter_not_exist|bucket_list_prefix_delimiter_prefix_delimiter_not_exist|bucket_listv2_prefix_delimiter_prefix_delimiter_not_exist|bucket_list_maxkeys_none|bucket_listv2_maxkeys_none|bucket_list_maxkeys_invalid|bucket_listv2_continuationtoken_empty|bucket_list_return_data|bucket_list_objects_anonymous|bucket_listv2_objects_anonymous|bucket_notexist|bucketv2_notexist|bucket_delete_nonempty|bucket_concurrent_set_canned_acl|object_write_to_nonexist_bucket|object_requestid_matches_header_on_error|object_set_get_metadata_none_to_good|object_set_get_metadata_none_to_empty|object_set_get_metadata_overwrite_to_empty|post_object_anonymous_request|post_object_authenticated_request|post_object_authenticated_no_content_type|post_object_authenticated_request_bad_access_key|post_object_set_success_code|post_object_set_invalid_success_code|post_object_upload_larger_than_chunk|post_object_set_key_from_filename|post_object_ignored_header|post_object_case_insensitive_condition_fields|post_object_escaped_field_values|post_object_success_redirect_action|post_object_invalid_signature|post_object_invalid_access_key|post_object_missing_policy_condition|post_object_user_specified_header|post_object_request_missing_policy_specified_field|post_object_expired_policy|post_object_invalid_request_field_value|get_object_ifunmodifiedsince_good|put_object_ifmatch_failed|object_raw_get_bucket_gone|object_delete_key_bucket_gone|object_raw_get_bucket_acl|object_raw_get_object_acl|object_raw_response_headers|object_raw_authenticated_bucket_gone|object_raw_get_x_amz_expires_out_max_range|object_raw_get_x_amz_expires_out_positive_range|object_anon_put_write_access|object_raw_put_authenticated_expired|bucket_create_exists|bucket_create_naming_bad_short_one|bucket_create_naming_bad_short_two|bucket_get_location|bucket_acl_default|bucket_acl_canned|bucket_acl_canned_publicreadwrite|bucket_acl_canned_authenticatedread|object_acl_default|object_acl_canned_during_create|object_acl_canned|object_acl_canned_publicreadwrite|object_acl_canned_authenticatedread|object_acl_canned_bucketownerread|object_acl_canned_bucketownerfullcontrol|object_acl_full_control_verify_attributes|bucket_acl_canned_private_to_private|bucket_acl_grant_nonexist_user|bucket_acl_no_grants|bucket_acl_grant_email_not_exist|bucket_acl_revoke_all|bucket_recreate_not_overriding|object_copy_verify_contenttype|object_copy_to_itself_with_metadata|object_copy_not_owned_bucket|object_copy_not_owned_object_bucket|object_copy_retaining_metadata|object_copy_replacing_metadata|multipart_upload_empty|multipart_copy_invalid_range|multipart_copy_special_names|multipart_upload_resend_part|multipart_upload_size_too_small|abort_multipart_upload_not_found|multipart_upload_missing_part|multipart_upload_incorrect_etag|100_continue|ranged_request_invalid_range|ranged_request_empty_object|access_bucket)"
    depends_on:
      - master
      - volume
@@ -1,12 +1,11 @@
 module github.com/chrislusf/seaweedfs

-go 1.12
+go 1.16

 require (
 	cloud.google.com/go v0.58.0 // indirect
 	cloud.google.com/go/pubsub v1.3.1
 	cloud.google.com/go/storage v1.9.0
-	github.com/Azure/azure-amqp-common-go/v2 v2.1.0 // indirect
 	github.com/Azure/azure-pipeline-go v0.2.2 // indirect
 	github.com/Azure/azure-storage-blob-go v0.9.0
 	github.com/OneOfOne/xxhash v1.2.2
@@ -15,7 +14,7 @@ require (
 	github.com/buraksezer/consistent v0.0.0-20191006190839-693edf70fd72
 	github.com/bwmarrin/snowflake v0.3.0
 	github.com/cespare/xxhash v1.1.0
-	github.com/chrislusf/raft v1.0.6
+	github.com/chrislusf/raft v1.0.7
 	github.com/coreos/go-semver v0.3.0 // indirect
 	github.com/dgrijalva/jwt-go v3.2.0+incompatible
 	github.com/disintegration/imaging v1.6.2
@@ -59,10 +58,10 @@ require (
 	github.com/olivere/elastic/v7 v7.0.19
 	github.com/peterh/liner v1.1.0
 	github.com/pierrec/lz4 v2.2.7+incompatible // indirect
+	github.com/pquerna/cachecontrol v0.1.0
 	github.com/prometheus/client_golang v1.3.0
-	github.com/rakyll/statik v0.1.7
 	github.com/rcrowley/go-metrics v0.0.0-20190826022208-cac0b30c2563 // indirect
-	github.com/seaweedfs/fuse v1.1.4
+	github.com/seaweedfs/fuse v1.1.7
 	github.com/seaweedfs/goexif v1.0.2
 	github.com/skip2/go-qrcode v0.0.0-20200617195104-da1b6568686e
 	github.com/spaolacci/murmur3 v1.1.0 // indirect
@@ -76,7 +75,6 @@ require (
 	github.com/tidwall/match v1.0.1
 	github.com/tsuna/gohbase v0.0.0-20201125011725-348991136365
 	github.com/valyala/bytebufferpool v1.0.0
-	github.com/valyala/fasthttp v1.20.0
 	github.com/viant/assertly v0.5.4 // indirect
 	github.com/viant/ptrie v0.3.0
 	github.com/viant/toolbox v0.33.2 // indirect
@@ -90,9 +88,8 @@ require (
 	gocloud.dev/pubsub/rabbitpubsub v0.20.0
 	golang.org/x/image v0.0.0-20200119044424-58c23975cae1 // indirect
 	golang.org/x/net v0.0.0-20201202161906-c7110b5ffcbb
-	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c
-	golang.org/x/sys v0.0.0-20201022201747-fb209a7c41cd
-	golang.org/x/tools v0.0.0-20200608174601-1b747fd94509
+	golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c
+	golang.org/x/tools v0.0.0-20201124115921-2c860bdd6e78
 	google.golang.org/api v0.26.0
 	google.golang.org/grpc v1.29.1
 	google.golang.org/protobuf v1.24.0
@@ -100,6 +97,7 @@ require (
 	gopkg.in/jcmturner/goidentity.v3 v3.0.0 // indirect
 	gopkg.in/jcmturner/gokrb5.v7 v7.3.0 // indirect
 	gopkg.in/karlseguin/expect.v1 v1.0.1 // indirect
+	modernc.org/sqlite v1.10.7
 )

 // replace github.com/seaweedfs/fuse => /Users/chris/go/src/github.com/seaweedfs/fuse
@@ -159,6 +159,8 @@ github.com/chrislusf/raft v1.0.5 h1:g8GxKCSStfm0/bGBDpNEbmEXL6MJkpXX+NI0ksbX5D4=
 github.com/chrislusf/raft v1.0.5/go.mod h1:Ep5DP+mJSosjfKiix1uU7Lc2Df/SX4oGJEpZlXH5l68=
 github.com/chrislusf/raft v1.0.6 h1:wunb85WWhMKhNRn7EmdIw35D4Lmew0ZJv8oYDizR/+Y=
 github.com/chrislusf/raft v1.0.6/go.mod h1:Ep5DP+mJSosjfKiix1uU7Lc2Df/SX4oGJEpZlXH5l68=
+github.com/chrislusf/raft v1.0.7 h1:reybAIwnQOTSgTj1YgflbJFWLSN0KVQSxe8gDZYa04o=
+github.com/chrislusf/raft v1.0.7/go.mod h1:Ep5DP+mJSosjfKiix1uU7Lc2Df/SX4oGJEpZlXH5l68=
 github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=
 github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5PlCu98SY8svDHJxuZscDgtXS6KTTbou5AhLI=
 github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMnBNeIyt5eFwwo7qiLfzFZmjNmxjkiQlU=
@@ -348,6 +350,7 @@ github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/
 github.com/google/go-cmp v0.4.1/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.5.0 h1:/QaMHBdZ26BB3SSst0Iwl10Epc+xhTquomWX0oZEB6w=
 github.com/google/go-cmp v0.5.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/go-cmp v0.5.3/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.5.4 h1:L8R9j+yAqZuZjsqh/z+F1NCffTKKLShY6zXTItVIZ8M=
 github.com/google/go-cmp v0.5.4/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-replayers/grpcreplay v0.1.0 h1:eNb1y9rZFmY4ax45uEEECSa8fsxGRU+8Bil52ASAwic=
@@ -474,6 +477,8 @@ github.com/karlseguin/expect v1.0.2-0.20190806010014-778a5f0c6003 h1:vJ0Snvo+SLM
 github.com/karlseguin/expect v1.0.2-0.20190806010014-778a5f0c6003/go.mod h1:zNBxMY8P21owkeogJELCLeHIt+voOSduHYTFUbwRAV8=
 github.com/karrick/godirwalk v1.8.0/go.mod h1:H5KPZjojv4lE+QYImBI8xVtrBRgYrIVsaRPx4tDPEn4=
 github.com/karrick/godirwalk v1.10.3/go.mod h1:RoGL9dQei4vP9ilrpETWE8CLOZ1kiN0LhBygSwrAsHA=
+github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51 h1:Z9n2FFNUXsshfwJMBgNA0RU6/i7WVaAegv3PtuIHPMs=
+github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51/go.mod h1:CzGEWj7cYgsdH8dAjBGEr58BoE7ScuLd+fwFZ44+/x8=
 github.com/kisielk/errcheck v1.1.0/go.mod h1:EZBBE59ingxPouuu3KfxchcWSUPOHkagtvWXihfKN4Q=
 github.com/kisielk/errcheck v1.2.0/go.mod h1:/BMXB+zMLi60iA8Vv6Ksmxu/1UDYcXs4uQLJ+jE2L00=
 github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck=
@@ -531,11 +536,14 @@ github.com/mattn/go-ieproxy v0.0.1/go.mod h1:pYabZ6IHcRpFh7vIaLfK7rdcWgFEb3SFJ6/
 github.com/mattn/go-isatty v0.0.3/go.mod h1:M+lRXTBqGeGNdLjl/ufCoiOlB5xdOkqRJdNxMWT7Zi4=
 github.com/mattn/go-isatty v0.0.4/go.mod h1:M+lRXTBqGeGNdLjl/ufCoiOlB5xdOkqRJdNxMWT7Zi4=
 github.com/mattn/go-isatty v0.0.8/go.mod h1:Iq45c/XA43vh69/j3iqttzPXn0bhXyGjM0Hdxcsrc5s=
+github.com/mattn/go-isatty v0.0.12 h1:wuysRhFDzyxgEmMf5xjvJ2M9dZoWAXNNr5LSBS7uHXY=
+github.com/mattn/go-isatty v0.0.12/go.mod h1:cbi8OIDigv2wuxKPP5vlRcQ1OAZbq2CE4Kysco4FUpU=
 github.com/mattn/go-runewidth v0.0.2/go.mod h1:LwmH8dsx7+W8Uxz3IHJYH5QSwggIsqBzpuz5H//U1FU=
 github.com/mattn/go-runewidth v0.0.3 h1:a+kO+98RDGEfo6asOGMmpodZq4FNtnGP54yps8BzLR4=
 github.com/mattn/go-runewidth v0.0.3/go.mod h1:LwmH8dsx7+W8Uxz3IHJYH5QSwggIsqBzpuz5H//U1FU=
 github.com/mattn/go-runewidth v0.0.4 h1:2BvfKmzob6Bmd4YsL0zygOqfdFnK7GR4QL06Do4/p7Y=
 github.com/mattn/go-runewidth v0.0.4/go.mod h1:LwmH8dsx7+W8Uxz3IHJYH5QSwggIsqBzpuz5H//U1FU=
+github.com/mattn/go-sqlite3 v1.14.6/go.mod h1:NyWgC/yNuGj7Q9rpYnZvas74GogHl5/Z4A/KQRfk6bU=
 github.com/matttproud/golang_protobuf_extensions v1.0.1 h1:4hp9jkHxhMHkqkrB3Ix0jegS5sx/RkqARlsWZ6pIwiU=
 github.com/matttproud/golang_protobuf_extensions v1.0.1/go.mod h1:D8He9yQNgCq6Z5Ld7szi9bcBfOoFv/3dc6xSMkL2PC0=
 github.com/miekg/dns v1.0.14/go.mod h1:W1PPwlIAgtquWBMBEV9nkV9Cazfe8ScdGz/Lj7v3Nrg=
@@ -637,6 +645,8 @@ github.com/pkg/sftp v1.10.1/go.mod h1:lYOWFsE0bwd1+KfKJaKeuokY15vzFx25BLbzYYoAxZ
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/posener/complete v1.1.1/go.mod h1:em0nMJCgc9GFtwrmVmEMR/ZL6WyhyjMBndrE9hABlRI=
+github.com/pquerna/cachecontrol v0.1.0 h1:yJMy84ti9h/+OEWa752kBTKv4XC30OtVVHYv/8cTqKc=
+github.com/pquerna/cachecontrol v0.1.0/go.mod h1:NrUG3Z7Rdu85UNR3vm7SOsl1nFIeSiQnrHV5K9mBcUI=
 github.com/prometheus/client_golang v0.9.1/go.mod h1:7SWBe2y4D6OKWSNQJUaRYU/AaXPKyh/dDVn+NZz0KFw=
 github.com/prometheus/client_golang v0.9.3-0.20190127221311-3c4408c8b829/go.mod h1:p2iRAGwDERtqlqzRXnrOVns+ignqQo//hLXqYxZYVNs=
 github.com/prometheus/client_golang v0.9.3/go.mod h1:/TN21ttK/J9q6uSwhBd54HahCDft0ttaMvbicHlPoso=
@@ -695,6 +705,12 @@ github.com/seaweedfs/fuse v1.1.3 h1:0DddotXwSRGbYG2kynoJyr8GHCy30Z2SpdhP3vdyijY=
 github.com/seaweedfs/fuse v1.1.3/go.mod h1:+PP6WlkrRUG6KPE+Th2EX5To/PjHaFsvqg/UgQ39aj8=
 github.com/seaweedfs/fuse v1.1.4 h1:YYqkK86agMhXRSwR+wFbRI8ikMgk3kL6PNTna1MAHyQ=
 github.com/seaweedfs/fuse v1.1.4/go.mod h1:+PP6WlkrRUG6KPE+Th2EX5To/PjHaFsvqg/UgQ39aj8=
+github.com/seaweedfs/fuse v1.1.5 h1:wyuRh/mDvrvt8ZLDS7YdPSe6nczniSx4sQFs/Jonveo=
+github.com/seaweedfs/fuse v1.1.5/go.mod h1:+PP6WlkrRUG6KPE+Th2EX5To/PjHaFsvqg/UgQ39aj8=
+github.com/seaweedfs/fuse v1.1.6 h1:kvCqaIsCEaYOBw5r8kJPUs9GcbwlIKcScnkPLT7HLuQ=
+github.com/seaweedfs/fuse v1.1.6/go.mod h1:+PP6WlkrRUG6KPE+Th2EX5To/PjHaFsvqg/UgQ39aj8=
+github.com/seaweedfs/fuse v1.1.7 h1:T4L5c/Sn+q8lE+0zCmH2MWvIO+B5TttWOSqK5KQPRMQ=
+github.com/seaweedfs/fuse v1.1.7/go.mod h1:+PP6WlkrRUG6KPE+Th2EX5To/PjHaFsvqg/UgQ39aj8=
 github.com/seaweedfs/goexif v1.0.2 h1:p+rTXYdQ2mgxd+1JaTrQ9N8DvYuw9UH9xgYmJ+Bb29E=
 github.com/seaweedfs/goexif v1.0.2/go.mod h1:MrKs5LK0HXdffrdCZrW3OIMegL2xXpC6ThLyXMyjdrk=
 github.com/secsy/goftp v0.0.0-20190720192957-f31499d7c79a h1:C6IhVTxNkhlb0tlCB6JfHOUv1f0xHPK7V8X4HlJZEJw=
@@ -804,6 +820,7 @@ github.com/xiang90/probing v0.0.0-20190116061207-43a291ad63a2/go.mod h1:UETIi67q
 github.com/xordataexchange/crypt v0.0.3-0.20170626215501-b2862e3d0a77/go.mod h1:aYKd//L2LvnjZzWKhF00oedf4jCCReLcmhLdhm1A27Q=
 github.com/yuin/goldmark v1.1.25/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 github.com/yuin/goldmark v1.1.27/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
+github.com/yuin/goldmark v1.2.1/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 go.etcd.io/bbolt v1.3.2 h1:Z/90sZLPOeCy2PwprqkFa25PdkusRzaj9P8zm/KNyvk=
 go.etcd.io/bbolt v1.3.2/go.mod h1:IbVyRI1SCnLcuJnV2u8VeU0CEYM7e686BmAb1XKL+uU=
 go.etcd.io/bbolt v1.3.4 h1:hi1bXHMVrlQh6WwxAy+qZCV/SYIlqo+Ushwdpa4tAKg=
@@ -948,6 +965,7 @@ golang.org/x/net v0.0.0-20200520004742-59133d7f0dd7/go.mod h1:qpuaurCH72eLCgpAm/
 golang.org/x/net v0.0.0-20200520182314-0ba52f642ac2/go.mod h1:qpuaurCH72eLCgpAm/N6yyVIVM9cpaDIP3A8BGJEC5A=
 golang.org/x/net v0.0.0-20200602114024-627f9648deb9/go.mod h1:qpuaurCH72eLCgpAm/N6yyVIVM9cpaDIP3A8BGJEC5A=
 golang.org/x/net v0.0.0-20201016165138-7b1cca2348c0/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
+golang.org/x/net v0.0.0-20201021035429-f5854403a974/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
 golang.org/x/net v0.0.0-20201202161906-c7110b5ffcbb h1:eBmm0M9fYhWpKZLjQUUKka/LtIxf46G4fxeEz5KJr9U=
 golang.org/x/net v0.0.0-20201202161906-c7110b5ffcbb/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
@@ -969,8 +987,8 @@ golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e/go.mod h1:RxMgew5VJxzue5/jJ
 golang.org/x/sync v0.0.0-20200317015054-43a5402ce75a/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20200930132711-30421366ff76 h1:JnxiSYT3Nm0BT2a8CyvYyM6cnrWpidecD1UuSYbhKm0=
 golang.org/x/sync v0.0.0-20200930132711-30421366ff76/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sync v0.0.0-20210220032951-036812b2e83c h1:5KslGYwFpkhGh+Q16bwMP3cOontH8FOep7tGV86Y7SQ=
-golang.org/x/sync v0.0.0-20210220032951-036812b2e83c/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9 h1:SQFwaSi55rU7vdNs9Yr0Z324VNlrF+0wMqRXT4St8ck=
+golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sys v0.0.0-20180823144017-11551d06cbcc/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
@@ -1003,6 +1021,7 @@ golang.org/x/sys v0.0.0-20191204072324-ce4227a45e2e/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20191220142924-d4481acd189f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20191228213918-04cbcbbfeed8/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200113162924-86b910548bc1/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200116001909-b77594299b42/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200122134326-e047566fdf82/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200202164722-d101bd2416d5 h1:LfCXLvNmTYH9kEmVgqbnsWfruoXZIrh4YBgqVHtDvw0=
 golang.org/x/sys v0.0.0-20200202164722-d101bd2416d5/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
@@ -1022,6 +1041,9 @@ golang.org/x/sys v0.0.0-20200602225109-6fdc65e7d980/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20201022201747-fb209a7c41cd h1:WgqgiQvkiZWz7XLhphjt2GI2GcGCTIZs9jqXMWmH+oc=
 golang.org/x/sys v0.0.0-20201022201747-fb209a7c41cd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20201126233918-771906719818/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c h1:VwygUrnw9jn88c4u8GD3rZQbqrP/tgas88tPUbBxQrk=
+golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.1-0.20180807135948-17ff2d5776d2/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
@@ -1091,12 +1113,16 @@ golang.org/x/tools v0.0.0-20200601175630-2caf76543d99/go.mod h1:EkVYQZoAsY45+roY
 golang.org/x/tools v0.0.0-20200606014950-c42cb6316fb6/go.mod h1:EkVYQZoAsY45+roYkvgYkIh4xh/qjgUK9TdY2XT94GE=
 golang.org/x/tools v0.0.0-20200608174601-1b747fd94509 h1:MI14dOfl3OG6Zd32w3ugsrvcUO810fDZdWakTq39dH4=
 golang.org/x/tools v0.0.0-20200608174601-1b747fd94509/go.mod h1:EkVYQZoAsY45+roYkvgYkIh4xh/qjgUK9TdY2XT94GE=
+golang.org/x/tools v0.0.0-20201124115921-2c860bdd6e78 h1:M8tBwCtWD/cZV9DZpFYRUgaymAYAr+aIUTWzDaM3uPs=
+golang.org/x/tools v0.0.0-20201124115921-2c860bdd6e78/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
 golang.org/x/xerrors v0.0.0-20190513163551-3ee3066db522/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7 h1:9zdDQZ7Thm29KFXgAX/+yaf3eVbP7djjWp/dXAppNCc=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 h1:go1bK/D/BFZV2I8cIQd1NKEZ+0owSTG1fDTci4IqFcE=
+golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 google.golang.org/api v0.3.1/go.mod h1:6wY9I6uQWHQ8EM57III9mq/AjF+i8G65rmVagqKMtkk=
 google.golang.org/api v0.4.0/go.mod h1:8k5glujaEP+g9n7WNsDg8QP6cUVNI86fCNMcbazEtwE=
 google.golang.org/api v0.5.0/go.mod h1:8k5glujaEP+g9n7WNsDg8QP6cUVNI86fCNMcbazEtwE=
@@ -1248,10 +1274,33 @@ honnef.co/go/tools v0.0.1-2020.1.4 h1:UoveltGrhghAA7ePc+e+QYDHXrBps2PqFZiHkGR/xK
 honnef.co/go/tools v0.0.1-2020.1.4/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
 modernc.org/b v1.0.0 h1:vpvqeyp17ddcQWF29Czawql4lDdABCDRbXRAS4+aF2o=
 modernc.org/b v1.0.0/go.mod h1:uZWcZfRj1BpYzfN9JTerzlNUnnPsV9O2ZA8JsRcubNg=
+modernc.org/cc/v3 v3.32.4/go.mod h1:0R6jl1aZlIl2avnYfbfHBS1QB6/f+16mihBObaBC878=
+modernc.org/cc/v3 v3.33.5 h1:gfsIOmcv80EelyQyOHn/Xhlzex8xunhQxWiJRMYmPrI=
+modernc.org/cc/v3 v3.33.5/go.mod h1:0R6jl1aZlIl2avnYfbfHBS1QB6/f+16mihBObaBC878=
+modernc.org/ccgo/v3 v3.9.2/go.mod h1:gnJpy6NIVqkETT+L5zPsQFj7L2kkhfPMzOghRNv/CFo=
+modernc.org/ccgo/v3 v3.9.4 h1:mt2+HyTZKxva27O6T4C9//0xiNQ/MornL3i8itM5cCs=
+modernc.org/ccgo/v3 v3.9.4/go.mod h1:19XAY9uOrYnDhOgfHwCABasBvK69jgC4I8+rizbk3Bc=
+modernc.org/httpfs v1.0.6/go.mod h1:7dosgurJGp0sPaRanU53W4xZYKh14wfzX420oZADeHM=
+modernc.org/libc v1.7.13-0.20210308123627-12f642a52bb8/go.mod h1:U1eq8YWr/Kc1RWCMFUWEdkTg8OTcfLw2kY8EDwl039w=
+modernc.org/libc v1.9.5 h1:zv111ldxmP7DJ5mOIqzRbza7ZDl3kh4ncKfASB2jIYY=
+modernc.org/libc v1.9.5/go.mod h1:U1eq8YWr/Kc1RWCMFUWEdkTg8OTcfLw2kY8EDwl039w=
 modernc.org/mathutil v1.1.1 h1:FeylZSVX8S+58VsyJlkEj2bcpdytmp9MmDKZkKx8OIE=
 modernc.org/mathutil v1.1.1/go.mod h1:mZW8CKdRPY1v87qxC/wUdX5O1qDzXMP5TH3wjfpga6E=
+modernc.org/mathutil v1.2.2 h1:+yFk8hBprV+4c0U9GjFtL+dV3N8hOJ8JCituQcMShFY=
+modernc.org/mathutil v1.2.2/go.mod h1:mZW8CKdRPY1v87qxC/wUdX5O1qDzXMP5TH3wjfpga6E=
+modernc.org/memory v1.0.4 h1:utMBrFcpnQDdNsmM6asmyH/FM9TqLPS7XF7otpJmrwM=
+modernc.org/memory v1.0.4/go.mod h1:nV2OApxradM3/OVbs2/0OsP6nPfakXpi50C7dcoHXlc=
+modernc.org/opt v0.1.1 h1:/0RX92k9vwVeDXj+Xn23DKp2VJubL7k8qNffND6qn3A=
+modernc.org/opt v0.1.1/go.mod h1:WdSiB5evDcignE70guQKxYUl14mgWtbClRi5wmkkTX0=
+modernc.org/sqlite v1.10.7 h1:B4ITfAx3HxSxOOKZqKhw4vnrhM+kTY1HoJf2L7PQBCQ=
+modernc.org/sqlite v1.10.7/go.mod h1:GXpJIZPNgRGqG0inyYDW18j9YpBpFUBn/weGI63hLLs=
 modernc.org/strutil v1.1.0 h1:+1/yCzZxY2pZwwrsbH+4T7BQMoLQ9QiBshRC9eicYsc=
 modernc.org/strutil v1.1.0/go.mod h1:lstksw84oURvj9y3tn8lGvRxyRC1S2+g5uuIzNfIOBs=
+modernc.org/tcl v1.5.2/go.mod h1:pmJYOLgpiys3oI4AeAafkcUfE+TKKilminxNyU/+Zlo=
+modernc.org/token v1.0.0 h1:a0jaWiNMDhDUtqOj09wvjWWAqd3q7WpBulmL9H2egsk=
+modernc.org/token v1.0.0/go.mod h1:UGzOrNV1mAFSEB63lOFHIpNRUVMvYTc6yu1SMY/XTDM=
+modernc.org/z v1.0.1-0.20210308123920-1f282aa71362/go.mod h1:8/SRk5C/HgiQWCgXdfpb+1RvhORdkz5sw72d3jjtyqA=
+modernc.org/z v1.0.1/go.mod h1:8/SRk5C/HgiQWCgXdfpb+1RvhORdkz5sw72d3jjtyqA=
 pack.ag/amqp v0.11.2/go.mod h1:4/cbmt4EJXSKlG6LCfWHoqmN0uFdy5i/+YFz+fTfhV4=
 rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
 rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
@@ -1,5 +1,5 @@
 apiVersion: v1
 description: SeaweedFS
 name: seaweedfs
-appVersion: "2.40"
-version: 2.40
+appVersion: "2.52"
+version: "2.52"
@@ -4,7 +4,7 @@ global:
  registry: ""
  repository: ""
  imageName: chrislusf/seaweedfs
-  # imageTag: "2.40" - started using {.Chart.appVersion}
+  # imageTag: "2.52" - started using {.Chart.appVersion}
  imagePullPolicy: IfNotPresent
  imagePullSecrets: imagepullsecret
  restartPolicy: Always
@@ -5,7 +5,7 @@

    <groupId>com.github.chrislusf</groupId>
    <artifactId>seaweedfs-client</artifactId>
-    <version>1.6.4</version>
+    <version>1.6.6</version>

    <parent>
        <groupId>org.sonatype.oss</groupId>
@@ -5,7 +5,7 @@

    <groupId>com.github.chrislusf</groupId>
    <artifactId>seaweedfs-client</artifactId>
-    <version>1.6.4</version>
+    <version>1.6.6</version>

    <parent>
        <groupId>org.sonatype.oss</groupId>
@@ -5,7 +5,7 @@

    <groupId>com.github.chrislusf</groupId>
    <artifactId>seaweedfs-client</artifactId>
-    <version>1.6.4</version>
+    <version>1.6.6</version>

    <parent>
        <groupId>org.sonatype.oss</groupId>
@@ -126,6 +126,18 @@ public class FilerClient extends FilerGrpcClient {

    }

+    public boolean exists(String path){
+        File pathFile = new File(path);
+        String parent = pathFile.getParent();
+        String entryName = pathFile.getName();
+        if(parent == null) {
+            parent = path;
+            entryName  ="";
+        }
+        return lookupEntry(parent, entryName) != null;
+
+    }
+
    public boolean rm(String path, boolean isRecursive, boolean ignoreRecusiveError) {

        File pathFile = new File(path);
@@ -142,10 +154,12 @@ public class FilerClient extends FilerGrpcClient {

    public boolean touch(String path, int mode) {
        String currentUser = System.getProperty("user.name");
-        return touch(path, mode, 0, 0, currentUser, new String[]{});
+
+        long now = System.currentTimeMillis() / 1000L;
+        return touch(path, now, mode, 0, 0, currentUser, new String[]{});
    }

-    public boolean touch(String path, int mode, int uid, int gid, String userName, String[] groupNames) {
+    public boolean touch(String path, long modifiedTimeSecond, int mode, int uid, int gid, String userName, String[] groupNames) {

        File pathFile = new File(path);
        String parent = pathFile.getParent().replace('\\','/');
@@ -155,17 +169,25 @@ public class FilerClient extends FilerGrpcClient {
        if (entry == null) {
            return createEntry(
                    parent,
-                    newFileEntry(name, mode, uid, gid, userName, groupNames).build()
+                    newFileEntry(name, modifiedTimeSecond, mode, uid, gid, userName, groupNames).build()
            );
        }
-        long now = System.currentTimeMillis() / 1000L;
-        FilerProto.FuseAttributes.Builder attr = entry.getAttributes().toBuilder()
-                .setMtime(now)
-                .setUid(uid)
-                .setGid(gid)
-                .setUserName(userName)
-                .clearGroupName()
-                .addAllGroupName(Arrays.asList(groupNames));
+        FilerProto.FuseAttributes.Builder attr = entry.getAttributes().toBuilder();
+        if (modifiedTimeSecond>0) {
+            attr.setMtime(modifiedTimeSecond);
+        }
+        if (uid>0) {
+            attr.setUid(uid);
+        }
+        if (gid>0) {
+            attr.setGid(gid);
+        }
+        if (userName!=null) {
+            attr.setUserName(userName);
+        }
+        if (groupNames!=null) {
+            attr.clearGroupName().addAllGroupName(Arrays.asList(groupNames));
+        }
        return updateEntry(parent, entry.toBuilder().setAttributes(attr).build());
    }

@@ -188,17 +210,15 @@ public class FilerClient extends FilerGrpcClient {
                        .addAllGroupName(Arrays.asList(groupNames)));
    }

-    public FilerProto.Entry.Builder newFileEntry(String name, int mode,
+    public FilerProto.Entry.Builder newFileEntry(String name, long modifiedTimeSecond, int mode,
                                                 int uid, int gid, String userName, String[] groupNames) {

-        long now = System.currentTimeMillis() / 1000L;
-
        return FilerProto.Entry.newBuilder()
                .setName(name)
                .setIsDirectory(false)
                .setAttributes(FilerProto.FuseAttributes.newBuilder()
-                        .setMtime(now)
-                        .setCrtime(now)
+                        .setMtime(modifiedTimeSecond)
+                        .setCrtime(modifiedTimeSecond)
                        .setUid(uid)
                        .setGid(gid)
                        .setFileMode(mode)
@@ -6,6 +6,7 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;

 import java.io.EOFException;
+import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InputStream;
 import java.nio.ByteBuffer;
@@ -34,6 +35,10 @@ public class SeaweedInputStream extends InputStream {
        this.entry = filerClient.lookupEntry(
                SeaweedOutputStream.getParentDirectory(fullpath),
                SeaweedOutputStream.getFileName(fullpath));
+        if(entry == null){
+            throw new FileNotFoundException();
+        }
+
        this.contentLength = SeaweedRead.fileSize(entry);

        this.visibleIntervalList = SeaweedRead.nonOverlappingVisibleIntervals(filerClient, entry.getChunksList());
@@ -39,7 +39,7 @@ public class SeaweedOutputStream extends OutputStream {
    }

    public SeaweedOutputStream(FilerClient filerClient, final String fullpath, final String replication) {
-        this(filerClient, fullpath, null, 0, 8 * 1024 * 1024, "000");
+        this(filerClient, fullpath, null, 0, 8 * 1024 * 1024, replication);
    }

    public SeaweedOutputStream(FilerClient filerClient, final String path, FilerProto.Entry.Builder entry,
@@ -1,5 +1,6 @@
 package seaweedfs.client;

+import com.google.common.base.Strings;
 import com.google.protobuf.ByteString;
 import org.apache.http.client.methods.CloseableHttpResponse;
 import org.apache.http.client.methods.HttpPost;
@@ -45,11 +46,16 @@ public class SeaweedWrite {
        FilerProto.AssignVolumeResponse response = filerClient.getBlockingStub().assignVolume(
                FilerProto.AssignVolumeRequest.newBuilder()
                        .setCollection(filerClient.getCollection())
-                        .setReplication(replication == null ? filerClient.getReplication() : replication)
+                        .setReplication(Strings.isNullOrEmpty(replication) ? filerClient.getReplication() : replication)
                        .setDataCenter("")
                        .setTtlSec(0)
                        .setPath(path)
                        .build());
+
+        if (!Strings.isNullOrEmpty(response.getError())) {
+            throw new IOException(response.getError());
+        }
+
        String fileId = response.getFileId();
        String auth = response.getAuth();

@@ -361,6 +361,7 @@ message FilerConf {
        string disk_type = 5;
        bool fsync = 6;
        uint32 volume_growth_count = 7;
+        bool read_only = 8;
    }
    repeated PathConf locations = 2;
 }
@@ -16,8 +16,17 @@ public class SeaweedFilerTest {
        filerClient.mkdirs("/new_folder", 0755);
        filerClient.touch("/new_folder/new_empty_file", 0755);
        filerClient.touch("/new_folder/new_empty_file2", 0755);
+        if(!filerClient.exists("/new_folder/new_empty_file")){
+            System.out.println("/new_folder/new_empty_file should exists");
+        }
+
        filerClient.rm("/new_folder/new_empty_file", false, true);
        filerClient.rm("/new_folder", true, true);
-
+        if(filerClient.exists("/new_folder/new_empty_file")){
+            System.out.println("/new_folder/new_empty_file should not exists");
+        }
+        if(!filerClient.exists("/")){
+            System.out.println("/ should exists");
+        }
    }
 }
@@ -11,13 +11,13 @@
        <dependency>
            <groupId>com.github.chrislusf</groupId>
            <artifactId>seaweedfs-client</artifactId>
-            <version>1.6.4</version>
+            <version>1.6.6</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>com.github.chrislusf</groupId>
            <artifactId>seaweedfs-hadoop2-client</artifactId>
-            <version>1.6.4</version>
+            <version>1.6.6</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
@@ -0,0 +1,22 @@
+package com.seaweedfs.examples;
+
+import com.google.common.io.Files;
+import seaweedfs.client.FilerClient;
+import seaweedfs.client.SeaweedOutputStream;
+
+import java.io.File;
+import java.io.IOException;
+
+public class ExampleWriteFile2 {
+
+    public static void main(String[] args) throws IOException {
+
+        FilerClient filerClient = new FilerClient("localhost", 18888);
+
+        SeaweedOutputStream seaweedOutputStream = new SeaweedOutputStream(filerClient, "/test/1");
+        Files.copy(new File("/etc/resolv.conf"), seaweedOutputStream);
+        seaweedOutputStream.close();
+
+    }
+
+}
@@ -301,7 +301,7 @@
    </snapshotRepository>
  </distributionManagement>
  <properties>
-    <seaweedfs.client.version>1.6.4</seaweedfs.client.version>
+    <seaweedfs.client.version>1.6.6</seaweedfs.client.version>
    <hadoop.version>2.9.2</hadoop.version>
  </properties>
 </project>
@@ -5,7 +5,7 @@
    <modelVersion>4.0.0</modelVersion>

    <properties>
-        <seaweedfs.client.version>1.6.4</seaweedfs.client.version>
+        <seaweedfs.client.version>1.6.6</seaweedfs.client.version>
        <hadoop.version>2.9.2</hadoop.version>
    </properties>

@@ -309,7 +309,7 @@
    </snapshotRepository>
  </distributionManagement>
  <properties>
-    <seaweedfs.client.version>1.6.4</seaweedfs.client.version>
+    <seaweedfs.client.version>1.6.6</seaweedfs.client.version>
    <hadoop.version>3.1.1</hadoop.version>
  </properties>
 </project>
@@ -5,7 +5,7 @@
    <modelVersion>4.0.0</modelVersion>

    <properties>
-        <seaweedfs.client.version>1.6.4</seaweedfs.client.version>
+        <seaweedfs.client.version>1.6.6</seaweedfs.client.version>
        <hadoop.version>3.1.1</hadoop.version>
    </properties>

@@ -1,4 +1,4 @@
-package load_test_leveldb
+package main

 import (
 	"crypto/md5"
@@ -0,0 +1,108 @@
+package main
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"google.golang.org/grpc"
+	"io"
+	"strconv"
+)
+
+var (
+	dir       = flag.String("dir", "/tmp", "directory to create files")
+	n         = flag.Int("n", 100, "the number of metadata")
+	tailFiler = flag.String("filer", "localhost:8888", "the filer address")
+	isWrite = flag.Bool("write", false, "only write")
+)
+
+func main() {
+
+	flag.Parse()
+
+	if *isWrite {
+		startGenerateMetadata()
+		return
+	}
+
+	expected := 0
+	startSubscribeMetadata(func(event *filer_pb.SubscribeMetadataResponse) error {
+		if event.Directory != *dir {
+			return nil
+		}
+		name := event.EventNotification.NewEntry.Name
+		fmt.Printf("=> %s\n", name)
+		id := name[4:]
+		if x, err := strconv.Atoi(id); err == nil {
+			if x != expected {
+				return fmt.Errorf("Expected file%d Actual %s\n", expected, name)
+			}
+			expected++
+		} else {
+			return err
+		}
+		return nil
+	})
+
+}
+
+func startGenerateMetadata() {
+	pb.WithFilerClient(*tailFiler, grpc.WithInsecure(), func(client filer_pb.SeaweedFilerClient) error {
+
+		for i := 0; i < *n; i++ {
+			name := fmt.Sprintf("file%d", i)
+			if err := filer_pb.CreateEntry(client, &filer_pb.CreateEntryRequest{
+				Directory: *dir,
+				Entry: &filer_pb.Entry{
+					Name: name,
+				},
+			}); err != nil {
+				fmt.Printf("create entry %s: %v\n", name, err)
+				return err
+			}
+		}
+
+		return nil
+
+	})
+}
+
+func startSubscribeMetadata(eachEntryFunc func(event *filer_pb.SubscribeMetadataResponse) error) {
+
+	lastTsNs := int64(0)
+
+	tailErr := pb.WithFilerClient(*tailFiler, grpc.WithInsecure(), func(client filer_pb.SeaweedFilerClient) error {
+
+		ctx, cancel := context.WithCancel(context.Background())
+		defer cancel()
+
+		stream, err := client.SubscribeMetadata(ctx, &filer_pb.SubscribeMetadataRequest{
+			ClientName: "tail",
+			PathPrefix: *dir,
+			SinceNs:    lastTsNs,
+		})
+		if err != nil {
+			return fmt.Errorf("listen: %v", err)
+		}
+
+		for {
+			resp, listenErr := stream.Recv()
+			if listenErr == io.EOF {
+				return nil
+			}
+			if listenErr != nil {
+				return listenErr
+			}
+			if err = eachEntryFunc(resp); err != nil {
+				return err
+			}
+			lastTsNs = resp.TsNs
+		}
+
+	})
+	if tailErr != nil {
+		fmt.Printf("tail %s: %v\n", *tailFiler, tailErr)
+	}
+}
@@ -52,7 +52,7 @@ func main() {
 }

 func genFile(grpcDialOption grpc.DialOption, i int) (*operation.AssignResult, string) {
-	assignResult, err := operation.Assign(*master, grpcDialOption, &operation.VolumeAssignRequest{
+	assignResult, err := operation.Assign(func() string { return *master }, grpcDialOption, &operation.VolumeAssignRequest{
 		Count:       1,
 		Replication: *replication,
 	})
@@ -16,7 +16,7 @@ debug_shell:

 debug_mount:
 	go build -gcflags="all=-N -l"
-	dlv --listen=:2345 --headless=true --api-version=2 --accept-multiclient exec weed -- mount -dir=~/tmp/mm -cacheCapacityMB=0 -filer.path=/buckets
+	dlv --listen=:2345 --headless=true --api-version=2 --accept-multiclient exec weed -- -v=4 mount -dir=~/tmp/mm -cacheCapacityMB=0 -filer.path=/buckets

 debug_server:
 	go build -gcflags="all=-N -l"
@@ -22,6 +22,7 @@ var Commands = []*Command{
 	cmdFilerReplicate,
 	cmdFilerSynchronize,
 	cmdFix,
+	cmdFuse,
 	cmdGateway,
 	cmdMaster,
 	cmdMount,
@@ -110,7 +110,7 @@ func runFilerCat(cmd *Command, args []string) bool {

 		filerCat.filerClient = client

-		return filer.StreamContent(&filerCat, writer, respLookupEntry.Entry.Chunks, 0, math.MaxInt64, false)
+		return filer.StreamContent(&filerCat, writer, respLookupEntry.Entry.Chunks, 0, math.MaxInt64)

 	})

@@ -3,6 +3,7 @@ package command
 import (
 	"context"
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/filer"
 	"io"
 	"io/ioutil"
 	"net/http"
@@ -46,6 +47,8 @@ type CopyOptions struct {
 	masters           []string
 	cipher            bool
 	ttlSec            int32
+	checkSize         *bool
+	verbose           *bool
 }

 func init() {
@@ -59,6 +62,8 @@ func init() {
 	copy.maxMB = cmdCopy.Flag.Int("maxMB", 4, "split files larger than the limit")
 	copy.concurrenctFiles = cmdCopy.Flag.Int("c", 8, "concurrent file copy goroutines")
 	copy.concurrenctChunks = cmdCopy.Flag.Int("concurrentChunks", 8, "concurrent chunk copy goroutines for each file")
+	copy.checkSize = cmdCopy.Flag.Bool("check.size", false, "copy when the target file size is different from the source file")
+	copy.verbose = cmdCopy.Flag.Bool("verbose", false, "print out details during copying")
 }

 var cmdCopy = &Command{
@@ -207,16 +212,6 @@ func genFileCopyTask(fileOrDir string, destPath string, fileCopyTaskChan chan Fi
 	}

 	mode := fi.Mode()
-	if mode.IsDir() {
-		files, _ := ioutil.ReadDir(fileOrDir)
-		for _, subFileOrDir := range files {
-			if err = genFileCopyTask(fileOrDir+"/"+subFileOrDir.Name(), destPath+fi.Name()+"/", fileCopyTaskChan); err != nil {
-				return err
-			}
-		}
-		return nil
-	}
-
 	uid, gid := util.GetFileUidGid(fi)

 	fileCopyTaskChan <- FileCopyTask{
@@ -228,6 +223,16 @@ func genFileCopyTask(fileOrDir string, destPath string, fileCopyTaskChan chan Fi
 		gid:                gid,
 	}

+	if mode.IsDir() {
+		files, _ := ioutil.ReadDir(fileOrDir)
+		for _, subFileOrDir := range files {
+			cleanedDestDirectory := filepath.Clean(destPath + fi.Name())
+			if err = genFileCopyTask(fileOrDir+"/"+subFileOrDir.Name(), cleanedDestDirectory+"/", fileCopyTaskChan); err != nil {
+				return err
+			}
+		}
+	}
+
 	return nil
 }

@@ -275,6 +280,15 @@ func (worker *FileCopyWorker) doEachCopy(task FileCopyTask) error {
 		}
 	}

+	if shouldCopy, err := worker.checkExistingFileFirst(task, f); err != nil {
+		return fmt.Errorf("check existing file: %v", err)
+	} else if !shouldCopy {
+		if *worker.options.verbose {
+			fmt.Printf("skipping copied file: %v\n", f.Name())
+		}
+		return nil
+	}
+
 	// find the chunk count
 	chunkSize := int64(*worker.options.maxMB * 1024 * 1024)
 	chunkCount := 1
@@ -289,42 +303,82 @@ func (worker *FileCopyWorker) doEachCopy(task FileCopyTask) error {
 	return worker.uploadFileInChunks(task, f, chunkCount, chunkSize)
 }

+func (worker *FileCopyWorker) checkExistingFileFirst(task FileCopyTask, f *os.File) (shouldCopy bool, err error) {
+
+	shouldCopy = true
+
+	if !*worker.options.checkSize {
+		return
+	}
+
+	fileStat, err := f.Stat()
+	if err != nil {
+		shouldCopy = false
+		return
+	}
+
+	err = pb.WithGrpcFilerClient(worker.filerGrpcAddress, worker.options.grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
+
+		request := &filer_pb.LookupDirectoryEntryRequest{
+			Directory: task.destinationUrlPath,
+			Name:      filepath.Base(f.Name()),
+		}
+
+		resp, lookupErr := client.LookupDirectoryEntry(context.Background(), request)
+		if lookupErr != nil {
+			// mostly not found error
+			return nil
+		}
+
+		if fileStat.Size() == int64(filer.FileSize(resp.Entry)) {
+			shouldCopy = false
+		}
+
+		return nil
+	})
+	return
+}
+
 func (worker *FileCopyWorker) uploadFileAsOne(task FileCopyTask, f *os.File) error {

 	// upload the file content
 	fileName := filepath.Base(f.Name())
-	mimeType := detectMimeType(f)
-	data, err := ioutil.ReadAll(f)
-	if err != nil {
-		return err
-	}
+	var mimeType string

 	var chunks []*filer_pb.FileChunk
 	var assignResult *filer_pb.AssignVolumeResponse
 	var assignError error

-	if task.fileSize > 0 {
+	if task.fileMode&os.ModeDir == 0 && task.fileSize > 0 {
+
+		mimeType = detectMimeType(f)
+		data, err := ioutil.ReadAll(f)
+		if err != nil {
+			return err
+		}

 		// assign a volume
-		err := pb.WithGrpcFilerClient(worker.filerGrpcAddress, worker.options.grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
+		err = util.Retry("assignVolume", func() error {
+			return pb.WithGrpcFilerClient(worker.filerGrpcAddress, worker.options.grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {

-			request := &filer_pb.AssignVolumeRequest{
-				Count:       1,
-				Replication: *worker.options.replication,
-				Collection:  *worker.options.collection,
-				TtlSec:      worker.options.ttlSec,
-				DiskType:    *worker.options.diskType,
-				Path:        task.destinationUrlPath,
-			}
+				request := &filer_pb.AssignVolumeRequest{
+					Count:       1,
+					Replication: *worker.options.replication,
+					Collection:  *worker.options.collection,
+					TtlSec:      worker.options.ttlSec,
+					DiskType:    *worker.options.diskType,
+					Path:        task.destinationUrlPath,
+				}

-			assignResult, assignError = client.AssignVolume(context.Background(), request)
-			if assignError != nil {
-				return fmt.Errorf("assign volume failure %v: %v", request, assignError)
-			}
-			if assignResult.Error != "" {
-				return fmt.Errorf("assign volume failure %v: %v", request, assignResult.Error)
-			}
-			return nil
+				assignResult, assignError = client.AssignVolume(context.Background(), request)
+				if assignError != nil {
+					return fmt.Errorf("assign volume failure %v: %v", request, assignError)
+				}
+				if assignResult.Error != "" {
+					return fmt.Errorf("assign volume failure %v: %v", request, assignResult.Error)
+				}
+				return nil
+			})
 		})
 		if err != nil {
 			return fmt.Errorf("Failed to assign from %v: %v\n", worker.options.masters, err)
@@ -339,11 +393,13 @@ func (worker *FileCopyWorker) uploadFileAsOne(task FileCopyTask, f *os.File) err
 		if uploadResult.Error != "" {
 			return fmt.Errorf("upload %v to %s result: %v\n", fileName, targetUrl, uploadResult.Error)
 		}
-		fmt.Printf("uploaded %s to %s\n", fileName, targetUrl)
+		if *worker.options.verbose {
+			fmt.Printf("uploaded %s to %s\n", fileName, targetUrl)
+		}

 		chunks = append(chunks, uploadResult.ToPbFileChunk(assignResult.FileId, 0))

-		fmt.Printf("copied %s => http://%s%s%s\n", fileName, worker.filerHost, task.destinationUrlPath, fileName)
+		fmt.Printf("copied %s => http://%s%s%s\n", f.Name(), worker.filerHost, task.destinationUrlPath, fileName)
 	}

 	if err := pb.WithGrpcFilerClient(worker.filerGrpcAddress, worker.options.grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
@@ -402,31 +458,30 @@ func (worker *FileCopyWorker) uploadFileInChunks(task FileCopyTask, f *os.File,
 			// assign a volume
 			var assignResult *filer_pb.AssignVolumeResponse
 			var assignError error
-			err := pb.WithGrpcFilerClient(worker.filerGrpcAddress, worker.options.grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
-				request := &filer_pb.AssignVolumeRequest{
-					Count:       1,
-					Replication: *worker.options.replication,
-					Collection:  *worker.options.collection,
-					TtlSec:      worker.options.ttlSec,
-					DiskType:    *worker.options.diskType,
-					Path:        task.destinationUrlPath + fileName,
-				}
+			err := util.Retry("assignVolume", func() error {
+				return pb.WithGrpcFilerClient(worker.filerGrpcAddress, worker.options.grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
+					request := &filer_pb.AssignVolumeRequest{
+						Count:       1,
+						Replication: *worker.options.replication,
+						Collection:  *worker.options.collection,
+						TtlSec:      worker.options.ttlSec,
+						DiskType:    *worker.options.diskType,
+						Path:        task.destinationUrlPath + fileName,
+					}

-				assignResult, assignError = client.AssignVolume(context.Background(), request)
-				if assignError != nil {
-					return fmt.Errorf("assign volume failure %v: %v", request, assignError)
-				}
-				if assignResult.Error != "" {
-					return fmt.Errorf("assign volume failure %v: %v", request, assignResult.Error)
-				}
-				return nil
+					assignResult, assignError = client.AssignVolume(context.Background(), request)
+					if assignError != nil {
+						return fmt.Errorf("assign volume failure %v: %v", request, assignError)
+					}
+					if assignResult.Error != "" {
+						return fmt.Errorf("assign volume failure %v: %v", request, assignResult.Error)
+					}
+					return nil
+				})
 			})
 			if err != nil {
 				fmt.Printf("Failed to assign from %v: %v\n", worker.options.masters, err)
 			}
-			if err != nil {
-				fmt.Printf("Failed to assign from %v: %v\n", worker.options.masters, err)
-			}

 			targetUrl := "http://" + assignResult.Url + "/" + assignResult.FileId
 			if collection == "" {
@@ -498,7 +553,7 @@ func (worker *FileCopyWorker) uploadFileInChunks(task FileCopyTask, f *os.File,
 		return fmt.Errorf("upload data %v to http://%s%s%s: %v\n", fileName, worker.filerHost, task.destinationUrlPath, fileName, err)
 	}

-	fmt.Printf("copied %s => http://%s%s%s\n", fileName, worker.filerHost, task.destinationUrlPath, fileName)
+	fmt.Printf("copied %s => http://%s%s%s\n", f.Name(), worker.filerHost, task.destinationUrlPath, fileName)

 	return nil
 }
@@ -359,16 +359,19 @@ func genProcessFunction(sourcePath string, targetPath string, dataSink sink.Repl
 	return processEventFn
 }

-func buildKey(dataSink sink.ReplicationSink, message *filer_pb.EventNotification, targetPath string, sourceKey util.FullPath, sourcePath string) string {
+func buildKey(dataSink sink.ReplicationSink, message *filer_pb.EventNotification, targetPath string, sourceKey util.FullPath, sourcePath string) (key string) {
 	if !dataSink.IsIncremental() {
-		return util.Join(targetPath, string(sourceKey)[len(sourcePath):])
+		key = util.Join(targetPath, string(sourceKey)[len(sourcePath):])
+	} else {
+		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")
+		key = util.Join(targetPath, dateKey, 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):])
+
+	return escapeKey(key)
 }
@@ -0,0 +1,7 @@
+// +build !windows
+
+package command
+
+func escapeKey(key string) string {
+	return key
+}
@@ -0,0 +1,12 @@
+package command
+
+import (
+	"strings"
+)
+
+func escapeKey(key string) string {
+	if strings.Contains(key, ":") {
+		return strings.ReplaceAll(key, ":", "")
+	}
+	return key
+}
@@ -0,0 +1,222 @@
+package command
+
+import (
+	"fmt"
+	"strings"
+	"strconv"
+	"time"
+	"os"
+)
+
+func init() {
+	cmdFuse.Run = runFuse // break init cycle
+}
+
+type parameter struct {
+	name string
+	value string
+}
+
+func runFuse(cmd *Command, args []string) bool {
+	rawArgs := strings.Join(args, " ")
+	rawArgsLen := len(rawArgs)
+	option := strings.Builder{}
+	options := []parameter{}
+
+	// first parameter
+	i := 0
+	for i = 0; i < rawArgsLen && rawArgs[i] != ' '; i++ {
+		option.WriteByte(rawArgs[i])
+	}
+	options = append(options, parameter{"arg0", option.String()})
+	option.Reset()
+
+	for i++; i < rawArgsLen; i++ {
+
+		// space separator check for filled option
+		if rawArgs[i] == ' ' {
+			if option.Len() > 0 {
+				options = append(options, parameter{option.String(), "true"})
+				option.Reset()
+			}
+
+		// dash separator read option until next space
+		} else if rawArgs[i] == '-' {
+			for i++; i < rawArgsLen && rawArgs[i] != ' '; i++ {
+				option.WriteByte(rawArgs[i])
+			}
+			options = append(options, parameter{option.String(), "true"})
+			option.Reset()
+
+		// equal separator start option with pending value
+		} else if rawArgs[i] == '=' {
+			name := option.String()
+			option.Reset()
+
+			for i++; i < rawArgsLen && rawArgs[i] != ','; i++ {
+				// double quote separator read option until next double quote
+				if rawArgs[i] == '"' {
+					for i++; i < rawArgsLen && rawArgs[i] != '"'; i++ {
+						option.WriteByte(rawArgs[i])
+					}
+
+				// single quote separator read option until next single quote
+				} else if rawArgs[i] == '\'' {
+					for i++; i < rawArgsLen && rawArgs[i] != '\''; i++ {
+						option.WriteByte(rawArgs[i])
+					}
+
+				// add chars before comma
+				} else if rawArgs[i] != ' ' {
+					option.WriteByte(rawArgs[i])
+				}
+			}
+
+			options = append(options, parameter{name, option.String()})
+			option.Reset()
+
+		// comma separator just read current option
+		} else if rawArgs[i] == ',' {
+			options = append(options, parameter{option.String(), "true"})
+			option.Reset()
+
+		// what is not a separator fill option buffer
+		} else {
+			option.WriteByte(rawArgs[i])
+		}
+	}
+
+	// get residual option data
+	if option.Len() > 0 {
+		// add value to pending option
+		options = append(options, parameter{option.String(), "true"})
+		option.Reset()
+	}
+
+	// scan each parameter
+	for i := 0; i < len(options); i++ {
+		parameter := options[i]
+
+		switch parameter.name  {
+		case "arg0":
+			mountOptions.dir = &parameter.value
+		case "filer":
+			mountOptions.filer = &parameter.value
+		case "filer.path":
+			mountOptions.filerMountRootPath = &parameter.value
+		case "dirAutoCreate":
+			if parsed, err := strconv.ParseBool(parameter.value); err != nil {
+				mountOptions.dirAutoCreate = &parsed
+			} else {
+				panic(fmt.Errorf("dirAutoCreate: %s", err))
+			}
+		case "collection":
+			mountOptions.collection = &parameter.value
+		case "replication":
+			mountOptions.replication = &parameter.value
+		case "disk":
+			mountOptions.diskType = &parameter.value
+		case "ttl":
+			if parsed, err := strconv.ParseInt(parameter.value, 0, 32); err != nil {
+				intValue := int(parsed)
+				mountOptions.ttlSec = &intValue
+			} else {
+				panic(fmt.Errorf("ttl: %s", err))
+			}
+		case "chunkSizeLimitMB":
+			if parsed, err := strconv.ParseInt(parameter.value, 0, 32); err != nil {
+				intValue := int(parsed)
+				mountOptions.chunkSizeLimitMB = &intValue
+			} else {
+				panic(fmt.Errorf("chunkSizeLimitMB: %s", err))
+			}
+		case "concurrentWriters":
+			i++
+			if parsed, err := strconv.ParseInt(parameter.value, 0, 32); err != nil {
+				intValue := int(parsed)
+				mountOptions.concurrentWriters = &intValue
+			} else {
+				panic(fmt.Errorf("concurrentWriters: %s", err))
+			}
+		case "cacheDir":
+			mountOptions.cacheDir = &parameter.value
+		case "cacheCapacityMB":
+			if parsed, err := strconv.ParseInt(parameter.value, 0, 64); err != nil {
+				mountOptions.cacheSizeMB = &parsed
+			} else {
+				panic(fmt.Errorf("cacheCapacityMB: %s", err))
+			}
+		case "dataCenter":
+			mountOptions.dataCenter = &parameter.value
+		case "allowOthers":
+			if parsed, err := strconv.ParseBool(parameter.value); err != nil {
+				mountOptions.allowOthers = &parsed
+			} else {
+				panic(fmt.Errorf("allowOthers: %s", err))
+			}
+		case "umask":
+			mountOptions.umaskString = &parameter.value
+		case "nonempty":
+			if parsed, err := strconv.ParseBool(parameter.value); err != nil {
+				mountOptions.nonempty = &parsed
+			} else {
+				panic(fmt.Errorf("nonempty: %s", err))
+			}
+		case "volumeServerAccess":
+			mountOptions.volumeServerAccess = &parameter.value
+		case "map.uid":
+			mountOptions.uidMap = &parameter.value
+		case "map.gid":
+			mountOptions.gidMap = &parameter.value
+		case "readOnly":
+			if parsed, err := strconv.ParseBool(parameter.value); err != nil {
+				mountOptions.readOnly = &parsed
+			} else {
+				panic(fmt.Errorf("readOnly: %s", err))
+			}
+		case "cpuprofile":
+			mountCpuProfile = &parameter.value
+		case "memprofile":
+			mountMemProfile = &parameter.value
+		case "readRetryTime":
+			if parsed, err := time.ParseDuration(parameter.value); err != nil {
+				mountReadRetryTime = &parsed
+			} else {
+				panic(fmt.Errorf("readRetryTime: %s", err))
+			}
+		}
+	}
+
+	// I don't know why PATH environment variable is lost
+	if err := os.Setenv("PATH", "/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin"); err != nil {
+		panic(fmt.Errorf("setenv: %s", err))
+	}
+
+	// just call "weed mount" command
+	return runMount(cmdMount, []string{})
+}
+
+var cmdFuse = &Command{
+	UsageLine: "fuse /mnt/mount/point -o \"filer=localhost:8888,filer.path=/\"",
+	Short: "Allow use weed with linux's mount command",
+	Long: `Allow use weed with linux's mount command
+
+  You can use -t weed on mount command:
+  mv weed /sbin/mount.weed
+  mount -t weed fuse /mnt -o "filer=localhost:8888,filer.path=/"
+
+  Or you can use -t fuse on mount command:
+  mv weed /sbin/weed
+  mount -t fuse.weed fuse /mnt -o "filer=localhost:8888,filer.path=/"
+  mount -t fuse "weed#fuse" /mnt -o "filer=localhost:8888,filer.path=/"
+
+  To use without mess with your /sbin:
+  mount -t fuse./home/user/bin/weed fuse /mnt -o "filer=localhost:8888,filer.path=/"
+  mount -t fuse "/home/user/bin/weed#fuse" /mnt -o "filer=localhost:8888,filer.path=/"
+
+  To pass more than one parameter use quotes, example:
+  mount -t weed fuse /mnt -o "filer='192.168.0.1:8888,192.168.0.2:8888',filer.path=/"
+
+  To check valid options look "weed mount --help"
+  `,
+}
@@ -37,7 +37,7 @@ var (

 func init() {
 	cmdMount.Run = runMount // break init cycle
-	mountOptions.filer = cmdMount.Flag.String("filer", "localhost:8888", "weed filer location")
+	mountOptions.filer = cmdMount.Flag.String("filer", "localhost:8888", "comma-separated weed filer location")
 	mountOptions.filerMountRootPath = cmdMount.Flag.String("filer.path", "/", "mount this remote path from filer server")
 	mountOptions.dir = cmdMount.Flag.String("dir", ".", "mount weed filer to this directory")
 	mountOptions.dirAutoCreate = cmdMount.Flag.Bool("dirAutoCreate", false, "auto create the directory to mount to")
@@ -5,15 +5,18 @@ package command
 import (
 	"context"
 	"fmt"
-	"github.com/chrislusf/seaweedfs/weed/storage/types"
 	"os"
 	"os/user"
 	"path"
+	"path/filepath"
 	"runtime"
 	"strconv"
 	"strings"
+	"syscall"
 	"time"

+	"github.com/chrislusf/seaweedfs/weed/storage/types"
+
 	"github.com/chrislusf/seaweedfs/weed/filesys/meta_cache"

 	"github.com/seaweedfs/fuse"
@@ -49,11 +52,26 @@ func runMount(cmd *Command, args []string) bool {
 	return RunMount(&mountOptions, os.FileMode(umask))
 }

+func getParentInode(mountDir string) (uint64, error) {
+	parentDir := filepath.Clean(filepath.Join(mountDir, ".."))
+	fi, err := os.Stat(parentDir)
+	if err != nil {
+		return 0, err
+	}
+
+	stat, ok := fi.Sys().(*syscall.Stat_t)
+	if !ok {
+		return 0, nil
+	}
+
+	return stat.Ino, nil
+}
+
 func RunMount(option *MountOptions, umask os.FileMode) bool {

-	filer := *option.filer
+	filers := strings.Split(*option.filer, ",")
 	// parse filer grpc address
-	filerGrpcAddress, err := pb.ParseServerToGrpcAddress(filer)
+	filerGrpcAddresses, err := pb.ParseServersToGrpcAddresses(filers)
 	if err != nil {
 		glog.V(0).Infof("ParseFilerGrpcAddress: %v", err)
 		return true
@@ -64,34 +82,40 @@ func RunMount(option *MountOptions, umask os.FileMode) bool {
 	grpcDialOption := security.LoadClientTLS(util.GetViper(), "grpc.client")
 	var cipher bool
 	for i := 0; i < 10; i++ {
-		err = pb.WithGrpcFilerClient(filerGrpcAddress, grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
+		err = pb.WithOneOfGrpcFilerClients(filerGrpcAddresses, 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)
+				return fmt.Errorf("get filer grpc address %v configuration: %v", filerGrpcAddresses, err)
 			}
 			cipher = resp.Cipher
 			return nil
 		})
 		if err != nil {
-			glog.V(0).Infof("failed to talk to filer %s: %v", filerGrpcAddress, err)
+			glog.V(0).Infof("failed to talk to filer %v: %v", filerGrpcAddresses, err)
 			glog.V(0).Infof("wait for %d seconds ...", i+1)
 			time.Sleep(time.Duration(i+1) * time.Second)
 		}
 	}
 	if err != nil {
-		glog.Errorf("failed to talk to filer %s: %v", filerGrpcAddress, err)
+		glog.Errorf("failed to talk to filer %v: %v", filerGrpcAddresses, err)
 		return true
 	}

 	filerMountRootPath := *option.filerMountRootPath
 	dir := util.ResolvePath(*option.dir)
-	chunkSizeLimitMB := *mountOptions.chunkSizeLimitMB
+	parentInode, err := getParentInode(dir)
+	if err != nil {
+		glog.Errorf("failed to retrieve inode for parent directory of %s: %v", dir, err)
+		return true
+	}

 	fmt.Printf("This is SeaweedFS version %s %s %s\n", util.Version(), runtime.GOOS, runtime.GOARCH)
 	if dir == "" {
 		fmt.Printf("Please specify the mount directory via \"-dir\"")
 		return false
 	}
+
+	chunkSizeLimitMB := *mountOptions.chunkSizeLimitMB
 	if chunkSizeLimitMB <= 0 {
 		fmt.Printf("Please specify a reasonable buffer size.")
 		return false
@@ -145,7 +169,7 @@ func RunMount(option *MountOptions, umask os.FileMode) bool {

 	options := []fuse.MountOption{
 		fuse.VolumeName(mountName),
-		fuse.FSName(filer + ":" + filerMountRootPath),
+		fuse.FSName(*option.filer + ":" + filerMountRootPath),
 		fuse.Subtype("seaweedfs"),
 		// fuse.NoAppleDouble(), // include .DS_Store, otherwise can not delete non-empty folders
 		fuse.NoAppleXattr(),
@@ -181,8 +205,8 @@ func RunMount(option *MountOptions, umask os.FileMode) bool {

 	seaweedFileSystem := filesys.NewSeaweedFileSystem(&filesys.Option{
 		MountDirectory:     dir,
-		FilerAddress:       filer,
-		FilerGrpcAddress:   filerGrpcAddress,
+		FilerAddresses:     filers,
+		FilerGrpcAddresses: filerGrpcAddresses,
 		GrpcDialOption:     grpcDialOption,
 		FilerMountRootPath: mountRoot,
 		Collection:         *option.collection,
@@ -199,6 +223,7 @@ func RunMount(option *MountOptions, umask os.FileMode) bool {
 		MountMode:          mountMode,
 		MountCtime:         fileInfo.ModTime(),
 		MountMtime:         time.Now(),
+		MountParentInode:   parentInode,
 		Umask:              umask,
 		VolumeServerAccess: *mountOptions.volumeServerAccess,
 		Cipher:             cipher,
@@ -218,9 +243,10 @@ func RunMount(option *MountOptions, umask os.FileMode) bool {
 		c.Close()
 	})

-	glog.V(0).Infof("mounted %s%s to %s", filer, mountRoot, dir)
+	glog.V(0).Infof("mounted %s%s to %v", *option.filer, mountRoot, dir)
 	server := fs.New(c, nil)
 	seaweedFileSystem.Server = server
+	seaweedFileSystem.StartBackgroundTasks()
 	err = server.Serve(seaweedFileSystem)

 	// check if the mount process has an error to report
@@ -101,6 +101,11 @@ dir = "./filerldb3"					# directory to store level db files
 enabled = false
 dir = "./filerrdb"					# directory to store rocksdb files

+[sqlite]
+# local on disk, similar to leveldb
+enabled = false
+dbFile = "./filer.db"				# sqlite db file
+
 [mysql]  # or memsql, tidb
 # CREATE TABLE IF NOT EXISTS filemeta (
 #   dirhash     BIGINT               COMMENT 'first 64 bits of MD5 hash value of directory field',
@@ -281,7 +286,7 @@ index.max_result_window = 10000
 #     Make sure they are not the same if using the same store type!
 # 4. Set enabled to true
 #
-# The following is just using cassandra as an example
+# The following is just using redis as an example
 ##########################
 [redis2.tmp]
 enabled = false
@@ -351,13 +356,14 @@ sub_url = "rabbit://myqueue"

 	REPLICATION_TOML_EXAMPLE = `
 # A sample TOML config file for replicating SeaweedFS filer
-# Used with "weed filer.replicate"
+# Used with "weed filer.backup"
+# Using with "weed filer.replicate" is deprecated.
 # Put this file to one of the location, with descending priority
 #    ./replication.toml
 #    $HOME/.seaweedfs/replication.toml
 #    /etc/seaweedfs/replication.toml

-[source.filer]
+[source.filer]  # deprecated. Only useful with "weed filer.replicate"
 enabled = true
 grpcAddress = "localhost:18888"
 # all files under this directory tree are replicated.
@@ -372,12 +378,6 @@ directory = "/data"
 # 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
-# so each date directory contains all new and updated files.
-enabled = false
-directory = "/backup"
-
 [sink.filer]
 enabled = false
 grpcAddress = "localhost:18888"
@@ -58,7 +58,8 @@ var (
 	serverDisableHttp         = cmdServer.Flag.Bool("disableHttp", false, "disable http requests, only gRPC operations are allowed.")
 	volumeDataFolders         = cmdServer.Flag.String("dir", os.TempDir(), "directories to store data files. dir[,dir]...")
 	volumeMaxDataVolumeCounts = cmdServer.Flag.String("volume.max", "8", "maximum numbers of volumes, count[,count]... If set to zero, the limit will be auto configured.")
-	volumeMinFreeSpacePercent = cmdServer.Flag.String("volume.minFreeSpacePercent", "1", "minimum free disk space (default to 1%). Low disk space will mark all volumes as ReadOnly.")
+	volumeMinFreeSpacePercent = cmdServer.Flag.String("volume.minFreeSpacePercent", "1", "minimum free disk space (default to 1%). Low disk space will mark all volumes as ReadOnly (deprecated, use minFreeSpace instead).")
+	volumeMinFreeSpace        = cmdServer.Flag.String("volume.minFreeSpace", "", "min free disk space (value<=100 as percentage like 1, other as human readable bytes, like 10GiB). Low disk space will mark all volumes as ReadOnly.")
 	serverMetricsHttpPort     = cmdServer.Flag.Int("metricsPort", 0, "Prometheus metrics listen port")

 	// pulseSeconds              = cmdServer.Flag.Int("pulseSeconds", 5, "number of seconds between heartbeats")
@@ -244,8 +245,8 @@ func runServer(cmd *Command, args []string) bool {

 	// start volume server
 	if *isStartingVolumeServer {
-		go serverOptions.v.startVolumeServer(*volumeDataFolders, *volumeMaxDataVolumeCounts, *serverWhiteListOption, *volumeMinFreeSpacePercent)
-
+		minFreeSpaces := util.MustParseMinFreeSpace(*volumeMinFreeSpace, *volumeMinFreeSpacePercent)
+		go serverOptions.v.startVolumeServer(*volumeDataFolders, *volumeMaxDataVolumeCounts, *serverWhiteListOption, minFreeSpaces)
 	}

 	if *isStartingMasterServer {
@@ -253,6 +254,4 @@ func runServer(cmd *Command, args []string) bool {
 	}

 	select {}
-
-	return true
 }
@@ -57,7 +57,6 @@ type VolumeServerOptions struct {
 	compactionMBPerSecond   *int
 	fileSizeLimitMB         *int
 	concurrentUploadLimitMB *int
-	minFreeSpacePercents    []float32
 	pprof                   *bool
 	preStopSeconds          *int
 	metricsHttpPort         *int
@@ -105,7 +104,8 @@ var (
 	volumeFolders         = cmdVolume.Flag.String("dir", os.TempDir(), "directories to store data files. dir[,dir]...")
 	maxVolumeCounts       = cmdVolume.Flag.String("max", "8", "maximum numbers of volumes, count[,count]... If set to zero, the limit will be auto configured.")
 	volumeWhiteListOption = cmdVolume.Flag.String("whiteList", "", "comma separated Ip addresses having write permission. No limit if empty.")
-	minFreeSpacePercent   = cmdVolume.Flag.String("minFreeSpacePercent", "1", "minimum free disk space (default to 1%). Low disk space will mark all volumes as ReadOnly.")
+	minFreeSpacePercent   = cmdVolume.Flag.String("minFreeSpacePercent", "1", "minimum free disk space (default to 1%). Low disk space will mark all volumes as ReadOnly (deprecated, use minFreeSpace instead).")
+	minFreeSpace          = cmdVolume.Flag.String("minFreeSpace", "", "min free disk space (value<=100 as percentage like 1, other as human readable bytes, like 10GiB). Low disk space will mark all volumes as ReadOnly.")
 )

 func runVolume(cmd *Command, args []string) bool {
@@ -120,12 +120,13 @@ func runVolume(cmd *Command, args []string) bool {

 	go stats_collect.StartMetricsServer(*v.metricsHttpPort)

-	v.startVolumeServer(*volumeFolders, *maxVolumeCounts, *volumeWhiteListOption, *minFreeSpacePercent)
+	minFreeSpaces := util.MustParseMinFreeSpace(*minFreeSpace, *minFreeSpacePercent)
+	v.startVolumeServer(*volumeFolders, *maxVolumeCounts, *volumeWhiteListOption, minFreeSpaces)

 	return true
 }

-func (v VolumeServerOptions) startVolumeServer(volumeFolders, maxVolumeCounts, volumeWhiteListOption, minFreeSpacePercent string) {
+func (v VolumeServerOptions) startVolumeServer(volumeFolders, maxVolumeCounts, volumeWhiteListOption string, minFreeSpaces []util.MinFreeSpace) {

 	// Set multiple folders and each folder's max volume count limit'
 	v.folders = strings.Split(volumeFolders, ",")
@@ -153,22 +154,13 @@ func (v VolumeServerOptions) startVolumeServer(volumeFolders, maxVolumeCounts, v
 		glog.Fatalf("%d directories by -dir, but only %d max is set by -max", len(v.folders), len(v.folderMaxLimits))
 	}

-	// set minFreeSpacePercent
-	minFreeSpacePercentStrings := strings.Split(minFreeSpacePercent, ",")
-	for _, freeString := range minFreeSpacePercentStrings {
-		if value, e := strconv.ParseFloat(freeString, 32); e == nil {
-			v.minFreeSpacePercents = append(v.minFreeSpacePercents, float32(value))
-		} else {
-			glog.Fatalf("The value specified in -minFreeSpacePercent not a valid value %s", freeString)
-		}
-	}
-	if len(v.minFreeSpacePercents) == 1 && len(v.folders) > 1 {
+	if len(minFreeSpaces) == 1 && len(v.folders) > 1 {
 		for i := 0; i < len(v.folders)-1; i++ {
-			v.minFreeSpacePercents = append(v.minFreeSpacePercents, v.minFreeSpacePercents[0])
+			minFreeSpaces = append(minFreeSpaces, minFreeSpaces[0])
 		}
 	}
-	if len(v.folders) != len(v.minFreeSpacePercents) {
-		glog.Fatalf("%d directories by -dir, but only %d minFreeSpacePercent is set by -minFreeSpacePercent", len(v.folders), len(v.minFreeSpacePercents))
+	if len(v.folders) != len(minFreeSpaces) {
+		glog.Fatalf("%d directories by -dir, but only %d minFreeSpacePercent is set by -minFreeSpacePercent", len(v.folders), len(minFreeSpaces))
 	}

 	// set disk types
@@ -231,7 +223,7 @@ func (v VolumeServerOptions) startVolumeServer(volumeFolders, maxVolumeCounts, v

 	volumeServer := weed_server.NewVolumeServer(volumeMux, publicVolumeMux,
 		*v.ip, *v.port, *v.publicUrl,
-		v.folders, v.folderMaxLimits, v.minFreeSpacePercents, diskTypes,
+		v.folders, v.folderMaxLimits, minFreeSpaces, diskTypes,
 		*v.idxFolder,
 		volumeNeedleMapKind,
 		strings.Split(masters, ","), 5, *v.dataCenter, *v.rack,
@@ -276,7 +276,9 @@ func (store *AbstractSqlStore) DeleteFolderChildren(ctx context.Context, fullpat
 		}
 	}

-	res, err := db.ExecContext(ctx, store.GetSqlDeleteFolderChildren(bucket), util.HashStringToLong(string(shortPath)), fullpath)
+	glog.V(4).Infof("delete %s SQL %s %d", string(shortPath), store.GetSqlDeleteFolderChildren(bucket), util.HashStringToLong(string(shortPath)))
+
+	res, err := db.ExecContext(ctx, store.GetSqlDeleteFolderChildren(bucket), util.HashStringToLong(string(shortPath)), string(shortPath))
 	if err != nil {
 		return fmt.Errorf("deleteFolderChildren %s: %s", fullpath, err)
 	}
@@ -2,7 +2,6 @@ package filer

 import (
 	"bytes"
-	"encoding/hex"
 	"fmt"
 	"github.com/chrislusf/seaweedfs/weed/wdclient"
 	"math"
@@ -43,12 +42,11 @@ func ETagEntry(entry *Entry) (etag string) {

 func ETagChunks(chunks []*filer_pb.FileChunk) (etag string) {
 	if len(chunks) == 1 {
-		return chunks[0].ETag
+		return fmt.Sprintf("%x", util.Base64Md5ToBytes(chunks[0].ETag))
 	}
 	md5_digests := [][]byte{}
 	for _, c := range chunks {
-		md5_decoded, _ := hex.DecodeString(c.ETag)
-		md5_digests = append(md5_digests, md5_decoded)
+		md5_digests = append(md5_digests, util.Base64Md5ToBytes(c.ETag))
 	}
 	return fmt.Sprintf("%x-%d", util.Md5(bytes.Join(md5_digests, nil)), len(chunks))
 }
@@ -29,7 +29,7 @@ func (f *Filer) LoadBuckets() {

 	limit := int64(math.MaxInt32)

-	entries, _, err := f.ListDirectoryEntries(context.Background(), util.FullPath(f.DirBucketsPath), "", false, limit, "", "")
+	entries, _, err := f.ListDirectoryEntries(context.Background(), util.FullPath(f.DirBucketsPath), "", false, limit, "", "", "")

 	if err != nil {
 		glog.V(1).Infof("no buckets found: %v", err)
@@ -126,6 +126,9 @@ func mergePathConf(a, b *filer_pb.FilerConf_PathConf) {
 	if b.VolumeGrowthCount > 0 {
 		a.VolumeGrowthCount = b.VolumeGrowthCount
 	}
+	if b.ReadOnly {
+		a.ReadOnly = b.ReadOnly
+	}
 }

 func (fc *FilerConf) ToProto() *filer_pb.FilerConf {
@@ -24,6 +24,18 @@ func TestFilerConf(t *testing.T) {
 			LocationPrefix: "/buckets/",
 			Replication:    "001",
 		},
+		{
+			LocationPrefix: "/buckets",
+			ReadOnly:       false,
+		},
+		{
+			LocationPrefix: "/buckets/xxx",
+			ReadOnly:       true,
+		},
+		{
+			LocationPrefix: "/buckets/xxx/yyy",
+			ReadOnly:       false,
+		},
 	}}
 	fc.doLoadConf(conf)

@@ -31,4 +43,7 @@ func TestFilerConf(t *testing.T) {
 	assert.Equal(t, "abcd", fc.MatchStorageRule("/buckets/abcd/jasdf").Collection)
 	assert.Equal(t, "001", fc.MatchStorageRule("/buckets/abc/jasdf").Replication)

+	assert.Equal(t, true, fc.MatchStorageRule("/buckets/xxx/yyy/zzz").ReadOnly)
+	assert.Equal(t, false, fc.MatchStorageRule("/buckets/other").ReadOnly)
+
 }
@@ -73,7 +73,7 @@ func (f *Filer) doBatchDeleteFolderMetaAndData(ctx context.Context, entry *Entry
 	includeLastFile := false
 	if !isDeletingBucket {
 		for {
-			entries, _, err := f.ListDirectoryEntries(ctx, entry.FullPath, lastFileName, includeLastFile, PaginationSize, "", "")
+			entries, _, err := f.ListDirectoryEntries(ctx, entry.FullPath, lastFileName, includeLastFile, PaginationSize, "", "", "")
 			if err != nil {
 				glog.Errorf("list folder %s: %v", entry.FullPath, err)
 				return nil, nil, fmt.Errorf("list folder %s: %v", entry.FullPath, err)
@@ -116,13 +116,13 @@ func (f *Filer) ReadPersistedLogBuffer(startTime time.Time, eachLogEntryFn func(
 	sizeBuf := make([]byte, 4)
 	startTsNs := startTime.UnixNano()

-	dayEntries, _, listDayErr := f.ListDirectoryEntries(context.Background(), SystemLogDir, startDate, true, 366, "", "")
+	dayEntries, _, listDayErr := f.ListDirectoryEntries(context.Background(), SystemLogDir, startDate, true, 366, "", "", "")
 	if listDayErr != nil {
 		return lastTsNs, fmt.Errorf("fail to list log by day: %v", listDayErr)
 	}
 	for _, dayEntry := range dayEntries {
 		// println("checking day", dayEntry.FullPath)
-		hourMinuteEntries, _, listHourMinuteErr := f.ListDirectoryEntries(context.Background(), util.NewFullPath(SystemLogDir, dayEntry.Name()), "", false, 24*60, "", "")
+		hourMinuteEntries, _, listHourMinuteErr := f.ListDirectoryEntries(context.Background(), util.NewFullPath(SystemLogDir, dayEntry.Name()), "", false, 24*60, "", "", "")
 		if listHourMinuteErr != nil {
 			return lastTsNs, fmt.Errorf("fail to list log %s by day: %v", dayEntry.Name(), listHourMinuteErr)
 		}
@@ -52,7 +52,7 @@ func (f *Filer) maybeReloadFilerConfiguration(event *filer_pb.SubscribeMetadataR

 func (f *Filer) readEntry(chunks []*filer_pb.FileChunk) ([]byte, error) {
 	var buf bytes.Buffer
-	err := StreamContent(f.MasterClient, &buf, chunks, 0, math.MaxInt64, false)
+	err := StreamContent(f.MasterClient, &buf, chunks, 0, math.MaxInt64)
 	if err != nil {
 		return nil, err
 	}
@@ -20,9 +20,9 @@ func splitPattern(pattern string) (prefix string, restPattern string) {
 }

 // For now, prefix and namePattern are mutually exclusive
-func (f *Filer) ListDirectoryEntries(ctx context.Context, p util.FullPath, startFileName string, inclusive bool, limit int64, prefix string, namePattern string) (entries []*Entry, hasMore bool, err error) {
+func (f *Filer) ListDirectoryEntries(ctx context.Context, p util.FullPath, startFileName string, inclusive bool, limit int64, prefix string, namePattern string, namePatternExclude string) (entries []*Entry, hasMore bool, err error) {

-	_, err = f.StreamListDirectoryEntries(ctx, p, startFileName, inclusive, limit+1, prefix, namePattern, func(entry *Entry) bool {
+	_, err = f.StreamListDirectoryEntries(ctx, p, startFileName, inclusive, limit+1, prefix, namePattern, namePatternExclude, func(entry *Entry) bool {
 		entries = append(entries, entry)
 		return true
 	})
@@ -36,7 +36,7 @@ func (f *Filer) ListDirectoryEntries(ctx context.Context, p util.FullPath, start
 }

 // For now, prefix and namePattern are mutually exclusive
-func (f *Filer) StreamListDirectoryEntries(ctx context.Context, p util.FullPath, startFileName string, inclusive bool, limit int64, prefix string, namePattern string, eachEntryFunc ListEachEntryFunc) (lastFileName string, err error) {
+func (f *Filer) StreamListDirectoryEntries(ctx context.Context, p util.FullPath, startFileName string, inclusive bool, limit int64, prefix string, namePattern string, namePatternExclude string, eachEntryFunc ListEachEntryFunc) (lastFileName string, err error) {
 	if strings.HasSuffix(string(p), "/") && len(p) > 1 {
 		p = p[0 : len(p)-1]
 	}
@@ -47,30 +47,38 @@ func (f *Filer) StreamListDirectoryEntries(ctx context.Context, p util.FullPath,
 	}
 	var missedCount int64

-	missedCount, lastFileName, err = f.doListPatternMatchedEntries(ctx, p, startFileName, inclusive, limit, prefix, restNamePattern, eachEntryFunc)
+	missedCount, lastFileName, err = f.doListPatternMatchedEntries(ctx, p, startFileName, inclusive, limit, prefix, restNamePattern, namePatternExclude, eachEntryFunc)

 	for missedCount > 0 && err == nil {
-		missedCount, lastFileName, err = f.doListPatternMatchedEntries(ctx, p, lastFileName, false, missedCount, prefix, restNamePattern, eachEntryFunc)
+		missedCount, lastFileName, err = f.doListPatternMatchedEntries(ctx, p, lastFileName, false, missedCount, prefix, restNamePattern, namePatternExclude, eachEntryFunc)
 	}

 	return
 }

-func (f *Filer) doListPatternMatchedEntries(ctx context.Context, p util.FullPath, startFileName string, inclusive bool, limit int64, prefix, restNamePattern string, eachEntryFunc ListEachEntryFunc) (missedCount int64, lastFileName string, err error) {
+func (f *Filer) doListPatternMatchedEntries(ctx context.Context, p util.FullPath, startFileName string, inclusive bool, limit int64, prefix, restNamePattern string, namePatternExclude string, eachEntryFunc ListEachEntryFunc) (missedCount int64, lastFileName string, err error) {

-	if len(restNamePattern) == 0 {
+	if len(restNamePattern) == 0 && len(namePatternExclude) == 0 {
 		lastFileName, err = f.doListValidEntries(ctx, p, startFileName, inclusive, limit, prefix, eachEntryFunc)
 		return 0, lastFileName, err
 	}

 	lastFileName, err = f.doListValidEntries(ctx, p, startFileName, inclusive, limit, prefix, func(entry *Entry) bool {
-		nameToTest := strings.ToLower(entry.Name())
-		if matched, matchErr := filepath.Match(restNamePattern, nameToTest[len(prefix):]); matchErr == nil && matched {
-			if !eachEntryFunc(entry) {
-				return false
+		nameToTest := entry.Name()
+		if len(namePatternExclude) > 0 {
+			if matched, matchErr := filepath.Match(namePatternExclude, nameToTest); matchErr == nil && matched {
+				missedCount++
+				return true
 			}
-		} else {
-			missedCount++
+		}
+		if len(restNamePattern) > 0 {
+			if matched, matchErr := filepath.Match(restNamePattern, nameToTest[len(prefix):]); matchErr == nil && !matched {
+				missedCount++
+				return true
+			}
+		}
+		if !eachEntryFunc(entry) {
+			return false
 		}
 		return true
 	})
@@ -150,7 +150,7 @@ func (fsw *FilerStoreWrapper) FindEntry(ctx context.Context, fp util.FullPath) (
 	}()

 	entry, err = actualStore.FindEntry(ctx, fp)
-	glog.V(4).Infof("FindEntry %s: %v", fp, err)
+	// glog.V(4).Infof("FindEntry %s: %v", fp, err)
 	if err != nil {
 		return nil, err
 	}
@@ -51,14 +51,14 @@ func TestCreateAndFind(t *testing.T) {
 	}

 	// checking one upper directory
-	entries, _, _ := testFiler.ListDirectoryEntries(ctx, util.FullPath("/home/chris/this/is/one"), "", false, 100, "", "")
+	entries, _, _ := testFiler.ListDirectoryEntries(ctx, util.FullPath("/home/chris/this/is/one"), "", false, 100, "", "", "")
 	if len(entries) != 1 {
 		t.Errorf("list entries count: %v", len(entries))
 		return
 	}

 	// checking one upper directory
-	entries, _, _ = testFiler.ListDirectoryEntries(ctx, util.FullPath("/"), "", false, 100, "", "")
+	entries, _, _ = testFiler.ListDirectoryEntries(ctx, util.FullPath("/"), "", false, 100, "", "", "")
 	if len(entries) != 1 {
 		t.Errorf("list entries count: %v", len(entries))
 		return
@@ -77,7 +77,7 @@ func TestEmptyRoot(t *testing.T) {
 	ctx := context.Background()

 	// checking one upper directory
-	entries, _, err := testFiler.ListDirectoryEntries(ctx, util.FullPath("/"), "", false, 100, "", "")
+	entries, _, err := testFiler.ListDirectoryEntries(ctx, util.FullPath("/"), "", false, 100, "", "", "")
 	if err != nil {
 		t.Errorf("list entries: %v", err)
 		return
@@ -49,14 +49,14 @@ func TestCreateAndFind(t *testing.T) {
 	}

 	// checking one upper directory
-	entries, _, _ := testFiler.ListDirectoryEntries(ctx, util.FullPath("/home/chris/this/is/one"), "", false, 100, "", "")
+	entries, _, _ := testFiler.ListDirectoryEntries(ctx, util.FullPath("/home/chris/this/is/one"), "", false, 100, "", "", "")
 	if len(entries) != 1 {
 		t.Errorf("list entries count: %v", len(entries))
 		return
 	}

 	// checking one upper directory
-	entries, _, _ = testFiler.ListDirectoryEntries(ctx, util.FullPath("/"), "", false, 100, "", "")
+	entries, _, _ = testFiler.ListDirectoryEntries(ctx, util.FullPath("/"), "", false, 100, "", "", "")
 	if len(entries) != 1 {
 		t.Errorf("list entries count: %v", len(entries))
 		return
@@ -75,7 +75,7 @@ func TestEmptyRoot(t *testing.T) {
 	ctx := context.Background()

 	// checking one upper directory
-	entries, _, err := testFiler.ListDirectoryEntries(ctx, util.FullPath("/"), "", false, 100, "", "")
+	entries, _, err := testFiler.ListDirectoryEntries(ctx, util.FullPath("/"), "", false, 100, "", "", "")
 	if err != nil {
 		t.Errorf("list entries: %v", err)
 		return
@@ -49,14 +49,14 @@ func TestCreateAndFind(t *testing.T) {
 	}

 	// checking one upper directory
-	entries, _, _ := testFiler.ListDirectoryEntries(ctx, util.FullPath("/home/chris/this/is/one"), "", false, 100, "", "")
+	entries, _, _ := testFiler.ListDirectoryEntries(ctx, util.FullPath("/home/chris/this/is/one"), "", false, 100, "", "", "")
 	if len(entries) != 1 {
 		t.Errorf("list entries count: %v", len(entries))
 		return
 	}

 	// checking one upper directory
-	entries, _, _ = testFiler.ListDirectoryEntries(ctx, util.FullPath("/"), "", false, 100, "", "")
+	entries, _, _ = testFiler.ListDirectoryEntries(ctx, util.FullPath("/"), "", false, 100, "", "", "")
 	if len(entries) != 1 {
 		t.Errorf("list entries count: %v", len(entries))
 		return
@@ -75,7 +75,7 @@ func TestEmptyRoot(t *testing.T) {
 	ctx := context.Background()

 	// checking one upper directory
-	entries, _, err := testFiler.ListDirectoryEntries(ctx, util.FullPath("/"), "", false, 100, "", "")
+	entries, _, err := testFiler.ListDirectoryEntries(ctx, util.FullPath("/"), "", false, 100, "", "", "")
 	if err != nil {
 		t.Errorf("list entries: %v", err)
 		return
@@ -71,6 +71,7 @@ func (ma *MetaAggregator) subscribeToOneFiler(f *Filer, self string, peer string

 	// when filer store is not shared by multiple filers
 	if peerSignature != f.Signature {
+		lastTsNs = 0
 		if prevTsNs, err := ma.readOffset(f, peer, peerSignature); err == nil {
 			lastTsNs = prevTsNs
 		}
@@ -7,6 +7,7 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"go.mongodb.org/mongo-driver/bson"
 	"go.mongodb.org/mongo-driver/mongo"
+	"go.mongodb.org/mongo-driver/mongo/options"
 )

 func (store *MongodbStore) KvPut(ctx context.Context, key []byte, value []byte) (err error) {
@@ -15,11 +16,11 @@ func (store *MongodbStore) KvPut(ctx context.Context, key []byte, value []byte)

 	c := store.connect.Database(store.database).Collection(store.collectionName)

-	_, err = c.InsertOne(ctx, Model{
-		Directory: dir,
-		Name:      name,
-		Meta:      value,
-	})
+	opts := options.Update().SetUpsert(true)
+	filter := bson.D{{"directory", dir}, {"name", name}}
+	update := bson.D{{"$set", bson.D{{"meta", value}}}}
+
+	_, err = c.UpdateOne(ctx, filter, update, opts)

 	if err != nil {
 		return fmt.Errorf("kv put: %v", err)
@@ -27,7 +27,7 @@ func ReadEntry(masterClient *wdclient.MasterClient, filerClient filer_pb.Seaweed
 		return err
 	}

-	return StreamContent(masterClient, byteBuffer, respLookupEntry.Entry.Chunks, 0, math.MaxInt64, false)
+	return StreamContent(masterClient, byteBuffer, respLookupEntry.Entry.Chunks, 0, math.MaxInt64)

 }

@@ -106,7 +106,7 @@ func (c *ChunkReadAt) ReadAt(p []byte, offset int64) (n int, err error) {
 	c.readerLock.Lock()
 	defer c.readerLock.Unlock()

-	glog.V(4).Infof("ReadAt [%d,%d) of total file size %d bytes %d chunk views", offset, offset+int64(len(p)), c.fileSize, len(c.chunkViews))
+	// glog.V(4).Infof("ReadAt [%d,%d) of total file size %d bytes %d chunk views", offset, offset+int64(len(p)), c.fileSize, len(c.chunkViews))
 	return c.doReadAt(p, offset)
 }

@@ -137,20 +137,22 @@ func (c *ChunkReadAt) doReadAt(p []byte, offset int64) (n int, err error) {
 		if chunkStart >= chunkStop {
 			continue
 		}
-		glog.V(4).Infof("read [%d,%d), %d/%d chunk %s [%d,%d)", chunkStart, chunkStop, i, len(c.chunkViews), chunk.FileId, chunk.LogicOffset-chunk.Offset, chunk.LogicOffset-chunk.Offset+int64(chunk.Size))
+		// glog.V(4).Infof("read [%d,%d), %d/%d chunk %s [%d,%d)", chunkStart, chunkStop, i, len(c.chunkViews), chunk.FileId, chunk.LogicOffset-chunk.Offset, chunk.LogicOffset-chunk.Offset+int64(chunk.Size))
 		var buffer []byte
-		buffer, err = c.readFromWholeChunkData(chunk, nextChunk)
+		bufferOffset := chunkStart - chunk.LogicOffset + chunk.Offset
+		bufferLength := chunkStop - chunkStart
+		buffer, err = c.readChunkSlice(chunk, nextChunk, uint64(bufferOffset), uint64(bufferLength))
 		if err != nil {
 			glog.Errorf("fetching chunk %+v: %v\n", chunk, err)
 			return
 		}
-		bufferOffset := chunkStart - chunk.LogicOffset + chunk.Offset
-		copied := copy(p[startOffset-offset:chunkStop-chunkStart+startOffset-offset], buffer[bufferOffset:bufferOffset+chunkStop-chunkStart])
+
+		copied := copy(p[startOffset-offset:chunkStop-chunkStart+startOffset-offset], buffer)
 		n += copied
 		startOffset, remaining = startOffset+int64(copied), remaining-int64(copied)
 	}

-	glog.V(4).Infof("doReadAt [%d,%d), n:%v, err:%v", offset, offset+int64(len(p)), n, err)
+	// glog.V(4).Infof("doReadAt [%d,%d), n:%v, err:%v", offset, offset+int64(len(p)), n, err)

 	if err == nil && remaining > 0 && c.fileSize > startOffset {
 		delta := int(min(remaining, c.fileSize-startOffset))
@@ -167,6 +169,20 @@ func (c *ChunkReadAt) doReadAt(p []byte, offset int64) (n int, err error) {

 }

+func (c *ChunkReadAt) readChunkSlice(chunkView *ChunkView, nextChunkViews *ChunkView, offset, length uint64) ([]byte, error) {
+
+	chunkSlice := c.chunkCache.GetChunkSlice(chunkView.FileId, offset, length)
+	if len(chunkSlice) > 0 {
+		return chunkSlice, nil
+	}
+	chunkData, err := c.readFromWholeChunkData(chunkView, nextChunkViews)
+	if err != nil {
+		return nil, err
+	}
+	wanted := min(int64(length), int64(len(chunkData))-int64(offset))
+	return chunkData[offset : int64(offset)+wanted], nil
+}
+
 func (c *ChunkReadAt) readFromWholeChunkData(chunkView *ChunkView, nextChunkViews ...*ChunkView) (chunkData []byte, err error) {

 	if c.lastChunkFileId == chunkView.FileId {
@@ -20,6 +20,11 @@ func (m *mockChunkCache) GetChunk(fileId string, minSize uint64) (data []byte) {
 	}
 	return data
 }
+
+func (m *mockChunkCache) GetChunkSlice(fileId string, offset, length uint64) []byte {
+	return nil
+}
+
 func (m *mockChunkCache) SetChunk(fileId string, data []byte) {
 }

@@ -53,14 +53,14 @@ func TestCreateAndFind(t *testing.T) {
 	}

 	// checking one upper directory
-	entries, _, _ := testFiler.ListDirectoryEntries(ctx, util.FullPath("/home/chris/this/is/one"), "", false, 100, "", "")
+	entries, _, _ := testFiler.ListDirectoryEntries(ctx, util.FullPath("/home/chris/this/is/one"), "", false, 100, "", "", "")
 	if len(entries) != 1 {
 		t.Errorf("list entries count: %v", len(entries))
 		return
 	}

 	// checking one upper directory
-	entries, _, _ = testFiler.ListDirectoryEntries(ctx, util.FullPath("/"), "", false, 100, "", "")
+	entries, _, _ = testFiler.ListDirectoryEntries(ctx, util.FullPath("/"), "", false, 100, "", "", "")
 	if len(entries) != 1 {
 		t.Errorf("list entries count: %v", len(entries))
 		return
@@ -79,7 +79,7 @@ func TestEmptyRoot(t *testing.T) {
 	ctx := context.Background()

 	// checking one upper directory
-	entries, _, err := testFiler.ListDirectoryEntries(ctx, util.FullPath("/"), "", false, 100, "", "")
+	entries, _, err := testFiler.ListDirectoryEntries(ctx, util.FullPath("/"), "", false, 100, "", "", "")
 	if err != nil {
 		t.Errorf("list entries: %v", err)
 		return
@@ -0,0 +1,78 @@
+// +build linux darwin windows
+
+// limited GOOS due to modernc.org/libc/unistd
+
+package sqlite
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+
+	"github.com/chrislusf/seaweedfs/weed/filer"
+	"github.com/chrislusf/seaweedfs/weed/filer/abstract_sql"
+	"github.com/chrislusf/seaweedfs/weed/filer/mysql"
+	"github.com/chrislusf/seaweedfs/weed/util"
+	_ "modernc.org/sqlite"
+)
+
+func init() {
+	filer.Stores = append(filer.Stores, &SqliteStore{})
+}
+
+type SqliteStore struct {
+	abstract_sql.AbstractSqlStore
+}
+
+func (store *SqliteStore) GetName() string {
+	return "sqlite"
+}
+
+func (store *SqliteStore) Initialize(configuration util.Configuration, prefix string) (err error) {
+	dbFile := configuration.GetString(prefix + "dbFile")
+	createTable := `CREATE TABLE IF NOT EXISTS "%s" (
+		dirhash BIGINT,
+		name VARCHAR(1000),
+		directory TEXT,
+		meta BLOB,
+		PRIMARY KEY (dirhash, name)
+	) WITHOUT ROWID;`
+	upsertQuery := `INSERT INTO "%s"(dirhash,name,directory,meta)VALUES(?,?,?,?)
+	ON CONFLICT(dirhash,name) DO UPDATE SET
+		directory=excluded.directory,
+		meta=excluded.meta;
+	`
+	return store.initialize(
+		dbFile,
+		createTable,
+		upsertQuery,
+	)
+}
+
+func (store *SqliteStore) initialize(dbFile, createTable, upsertQuery string) (err error) {
+
+	store.SupportBucketTable = true
+	store.SqlGenerator = &mysql.SqlGenMysql{
+		CreateTableSqlTemplate: createTable,
+		DropTableSqlTemplate:   "drop table `%s`",
+		UpsertQueryTemplate:    upsertQuery,
+	}
+
+	var dbErr error
+	store.DB, dbErr = sql.Open("sqlite", dbFile)
+	if dbErr != nil {
+		store.DB.Close()
+		store.DB = nil
+		return fmt.Errorf("can not connect to %s error:%v", dbFile, err)
+	}
+
+	if err = store.DB.Ping(); err != nil {
+		return fmt.Errorf("connect to %s error:%v", dbFile, err)
+	}
+
+	if err = store.CreateTable(context.Background(), abstract_sql.DEFAULT_TABLE); err != nil {
+		return fmt.Errorf("init table %s: %v", abstract_sql.DEFAULT_TABLE, err)
+	}
+
+	return nil
+}
@@ -0,0 +1,9 @@
+// +build !linux,!darwin,!windows
+
+// limited GOOS due to modernc.org/libc/unistd
+
+package sqlite
+
+func init() {
+	// filer.Stores = append(filer.Stores, &SqliteStore{})
+}
@@ -3,18 +3,19 @@ package filer
 import (
 	"bytes"
 	"fmt"
-	"golang.org/x/sync/errgroup"
 	"io"
 	"math"
 	"strings"
+	"time"

 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/stats"
 	"github.com/chrislusf/seaweedfs/weed/util"
 	"github.com/chrislusf/seaweedfs/weed/wdclient"
 )

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

 	glog.V(9).Infof("start to stream content for chunks: %+v\n", chunks)
 	chunkViews := ViewFromChunks(masterClient.GetLookupFileIdFunction(), chunks, offset, size)
@@ -34,48 +35,29 @@ func StreamContent(masterClient wdclient.HasLookupFileIdFunction, w io.Writer, c
 		fileId2Url[chunkView.FileId] = urlStrings
 	}

-	if isCheck {
-		// Pre-check all chunkViews urls
-		gErr := new(errgroup.Group)
-		CheckAllChunkViews(chunkViews, &fileId2Url, gErr)
-		if err := gErr.Wait(); err != nil {
-			glog.Errorf("check all chunks: %v", err)
-			return fmt.Errorf("check all chunks: %v", err)
-		}
-		return nil
-	}
-
 	for _, chunkView := range chunkViews {

 		urlStrings := fileId2Url[chunkView.FileId]
+		start := time.Now()
 		data, err := retriedFetchChunkData(urlStrings, chunkView.CipherKey, chunkView.IsGzipped, chunkView.IsFullChunk(), chunkView.Offset, int(chunkView.Size))
+		stats.FilerRequestHistogram.WithLabelValues("chunkDownload").Observe(time.Since(start).Seconds())
 		if err != nil {
-			glog.Errorf("read chunk: %v", err)
+			stats.FilerRequestCounter.WithLabelValues("chunkDownloadError").Inc()
 			return fmt.Errorf("read chunk: %v", err)
 		}

 		_, err = w.Write(data)
 		if err != nil {
-			glog.Errorf("write chunk: %v", err)
+			stats.FilerRequestCounter.WithLabelValues("chunkDownloadedError").Inc()
 			return fmt.Errorf("write chunk: %v", err)
 		}
+		stats.FilerRequestCounter.WithLabelValues("chunkDownload").Inc()
 	}

 	return nil

 }

-func CheckAllChunkViews(chunkViews []*ChunkView, fileId2Url *map[string][]string, gErr *errgroup.Group) {
-	for _, chunkView := range chunkViews {
-		urlStrings := (*fileId2Url)[chunkView.FileId]
-		glog.V(9).Infof("Check chunk: %+v\n url: %v", chunkView, urlStrings)
-		gErr.Go(func() error {
-			_, err := retriedFetchChunkData(urlStrings, chunkView.CipherKey, chunkView.IsGzipped, chunkView.IsFullChunk(), chunkView.Offset, int(chunkView.Size))
-			return err
-		})
-	}
-}
-
 // ----------------  ReadAllReader ----------------------------------

 func ReadAll(masterClient *wdclient.MasterClient, chunks []*filer_pb.FileChunk) ([]byte, error) {
@@ -28,7 +28,8 @@ type Dir struct {
 }

 var _ = fs.Node(&Dir{})
-//var _ = fs.NodeIdentifier(&Dir{})
+
+var _ = fs.NodeIdentifier(&Dir{})
 var _ = fs.NodeCreater(&Dir{})
 var _ = fs.NodeMknoder(&Dir{})
 var _ = fs.NodeMkdirer(&Dir{})
@@ -44,34 +45,36 @@ var _ = fs.NodeRemovexattrer(&Dir{})
 var _ = fs.NodeListxattrer(&Dir{})
 var _ = fs.NodeForgetter(&Dir{})

-func (dir *Dir) xId() uint64 {
+func (dir *Dir) Id() uint64 {
+	if dir.parent == nil {
+		return 1
+	}
 	return dir.id
 }

 func (dir *Dir) Attr(ctx context.Context, attr *fuse.Attr) error {

-	// https://github.com/bazil/fuse/issues/196
-	attr.Valid = time.Second
-
-	if dir.FullPath() == dir.wfs.option.FilerMountRootPath {
-		dir.setRootDirAttributes(attr)
-		glog.V(3).Infof("root dir Attr %s, attr: %+v", dir.FullPath(), attr)
-		return nil
-	}
-
 	entry, err := dir.maybeLoadEntry()
 	if err != nil {
-		glog.V(3).Infof("dir Attr %s,err: %+v", dir.FullPath(), err)
+		glog.V(3).Infof("dir Attr %s, err: %+v", dir.FullPath(), err)
 		return err
 	}

-	// attr.Inode = dir.Id()
+	// https://github.com/bazil/fuse/issues/196
+	attr.Valid = time.Second
+	attr.Inode = dir.Id()
 	attr.Mode = os.FileMode(entry.Attributes.FileMode) | os.ModeDir
 	attr.Mtime = time.Unix(entry.Attributes.Mtime, 0)
 	attr.Crtime = time.Unix(entry.Attributes.Crtime, 0)
+	attr.Ctime = time.Unix(entry.Attributes.Crtime, 0)
+	attr.Atime = time.Unix(entry.Attributes.Mtime, 0)
 	attr.Gid = entry.Attributes.Gid
 	attr.Uid = entry.Attributes.Uid

+	if dir.FullPath() == dir.wfs.option.FilerMountRootPath {
+		attr.BlockSize = blockSize
+	}
+
 	glog.V(4).Infof("dir Attr %s, attr: %+v", dir.FullPath(), attr)

 	return nil
@@ -89,20 +92,6 @@ func (dir *Dir) Getxattr(ctx context.Context, req *fuse.GetxattrRequest, resp *f
 	return getxattr(entry, req, resp)
 }

-func (dir *Dir) setRootDirAttributes(attr *fuse.Attr) {
-	// attr.Inode = 1 // filer2.FullPath(dir.Path).AsInode()
-	attr.Valid = time.Second
-	attr.Inode = 1 // dir.Id()
-	attr.Uid = dir.wfs.option.MountUid
-	attr.Gid = dir.wfs.option.MountGid
-	attr.Mode = dir.wfs.option.MountMode
-	attr.Crtime = dir.wfs.option.MountCtime
-	attr.Ctime = dir.wfs.option.MountCtime
-	attr.Mtime = dir.wfs.option.MountMtime
-	attr.Atime = dir.wfs.option.MountMtime
-	attr.BlockSize = blockSize
-}
-
 func (dir *Dir) Fsync(ctx context.Context, req *fuse.FsyncRequest) error {
 	// fsync works at OS level
 	// write the file chunks to the filerGrpcAddress
@@ -140,20 +129,39 @@ func (dir *Dir) newDirectory(fullpath util.FullPath) fs.Node {
 func (dir *Dir) Create(ctx context.Context, req *fuse.CreateRequest,
 	resp *fuse.CreateResponse) (fs.Node, fs.Handle, error) {

-	request, err := dir.doCreateEntry(req.Name, req.Mode, req.Uid, req.Gid, req.Flags&fuse.OpenExclusive != 0)
+	exclusive := req.Flags&fuse.OpenExclusive != 0
+	isDirectory := req.Mode&os.ModeDir > 0

-	if err != nil {
-		return nil, nil, err
+	if exclusive || isDirectory {
+		_, err := dir.doCreateEntry(req.Name, req.Mode, req.Uid, req.Gid, exclusive)
+		if err != nil {
+			return nil, nil, err
+		}
 	}
 	var node fs.Node
-	if request.Entry.IsDirectory {
+	if isDirectory {
 		node = dir.newDirectory(util.NewFullPath(dir.FullPath(), req.Name))
 		return node, nil, nil
 	}

 	node = dir.newFile(req.Name)
 	file := node.(*File)
-	fh := dir.wfs.AcquireHandle(file, req.Uid, req.Gid)
+	file.entry = &filer_pb.Entry{
+		Name:        req.Name,
+		IsDirectory: req.Mode&os.ModeDir > 0,
+		Attributes: &filer_pb.FuseAttributes{
+			Mtime:       time.Now().Unix(),
+			Crtime:      time.Now().Unix(),
+			FileMode:    uint32(req.Mode &^ dir.wfs.option.Umask),
+			Uid:         req.Uid,
+			Gid:         req.Gid,
+			Collection:  dir.wfs.option.Collection,
+			Replication: dir.wfs.option.Replication,
+			TtlSec:      dir.wfs.option.TtlSec,
+		},
+	}
+	file.dirtyMetadata = true
+	fh := dir.wfs.AcquireHandle(file, req.Uid, req.Gid, req.Flags&fuse.OpenWriteOnly > 0)
 	return file, fh, nil

 }
@@ -273,7 +281,7 @@ 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) {

 	dirPath := util.FullPath(dir.FullPath())
-	glog.V(4).Infof("dir Lookup %s: %s by %s", dirPath, req.Name, req.Header.String())
+	// 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)
@@ -308,6 +316,7 @@ func (dir *Dir) Lookup(ctx context.Context, req *fuse.LookupRequest, resp *fuse.
 		// resp.EntryValid = time.Second
 		resp.Attr.Inode = fullFilePath.AsInode()
 		resp.Attr.Valid = time.Second
+		resp.Attr.Size = localEntry.FileSize
 		resp.Attr.Mtime = localEntry.Attr.Mtime
 		resp.Attr.Crtime = localEntry.Attr.Crtime
 		resp.Attr.Mode = localEntry.Attr.Mode
@@ -351,6 +360,28 @@ func (dir *Dir) ReadDirAll(ctx context.Context) (ret []fuse.Dirent, err error) {
 		glog.Errorf("list meta cache: %v", listErr)
 		return nil, fuse.EIO
 	}
+
+	// create proper . and .. directories
+	ret = append(ret, fuse.Dirent{
+		Inode: dirPath.AsInode(),
+		Name:  ".",
+		Type:  fuse.DT_Dir,
+	})
+
+	// return the correct parent inode for the mount root
+	var inode uint64
+	if string(dirPath) == dir.wfs.option.FilerMountRootPath {
+		inode = dir.wfs.option.MountParentInode
+	} else {
+		inode = util.FullPath(dir.parent.FullPath()).AsInode()
+	}
+
+	ret = append(ret, fuse.Dirent{
+		Inode: inode,
+		Name:  "..",
+		Type:  fuse.DT_Dir,
+	})
+
 	return
 }

@@ -68,9 +68,16 @@ func (dir *Dir) Rename(ctx context.Context, req *fuse.RenameRequest, newDirector
 	newFsNode := NodeWithId(newPath.AsInode())
 	dir.wfs.Server.InvalidateInternalNode(oldFsNode, newFsNode, func(internalNode fs.Node) {
 		if file, ok := internalNode.(*File); ok {
-			glog.V(4).Infof("internal node %s", file.Name)
+			glog.V(4).Infof("internal file node %s", file.Name)
 			file.Name = req.NewName
 			file.id = uint64(newFsNode)
+			file.dir = newDir
+		}
+		if dir, ok := internalNode.(*Dir); ok {
+			glog.V(4).Infof("internal dir node %s", dir.name)
+			dir.name = req.NewName
+			dir.id = uint64(newFsNode)
+			dir.parent = newDir
 		}
 	})

@@ -1,7 +1,6 @@
 package filesys

 import (
-	"bytes"
 	"io"

 	"github.com/chrislusf/seaweedfs/weed/util"
@@ -214,7 +213,7 @@ func (l *IntervalLinkedList) ToReader() io.Reader {
 	readers = append(readers, util.NewBytesReader(t.Data))
 	for t.Next != nil {
 		t = t.Next
-		readers = append(readers, bytes.NewReader(t.Data))
+		readers = append(readers, util.NewBytesReader(t.Data))
 	}
 	if len(readers) == 1 {
 		return readers[0]
@@ -0,0 +1,10 @@
+package filesys
+
+type DirtyPages interface {
+	AddPage(offset int64, data []byte)
+	FlushData() error
+	ReadDirtyDataAt(data []byte, startOffset int64) (maxStop int64)
+	GetStorageOptions() (collection, replication string)
+	SetWriteOnly(writeOnly bool)
+	GetWriteOnly() (writeOnly bool)
+}
@@ -2,6 +2,7 @@ package filesys

 import (
 	"bytes"
+	"fmt"
 	"io"
 	"sync"
 	"time"
@@ -13,6 +14,7 @@ import (
 type ContinuousDirtyPages struct {
 	intervals      *ContinuousIntervals
 	f              *File
+	writeOnly      bool
 	writeWaitGroup sync.WaitGroup
 	chunkAddLock   sync.Mutex
 	lastErr        error
@@ -20,10 +22,11 @@ type ContinuousDirtyPages struct {
 	replication    string
 }

-func newDirtyPages(file *File) *ContinuousDirtyPages {
+func newContinuousDirtyPages(file *File, writeOnly bool) *ContinuousDirtyPages {
 	dirtyPages := &ContinuousDirtyPages{
 		intervals: &ContinuousIntervals{},
 		f:         file,
+		writeOnly: writeOnly,
 	}
 	return dirtyPages
 }
@@ -57,6 +60,16 @@ func (pages *ContinuousDirtyPages) flushAndSave(offset int64, data []byte) {
 	return
 }

+func (pages *ContinuousDirtyPages) FlushData() error {
+
+	pages.saveExistingPagesToStorage()
+	pages.writeWaitGroup.Wait()
+	if pages.lastErr != nil {
+		return fmt.Errorf("flush data: %v", pages.lastErr)
+	}
+	return nil
+}
+
 func (pages *ContinuousDirtyPages) saveExistingPagesToStorage() {
 	for pages.saveExistingLargestPageToStorage() {
 	}
@@ -94,7 +107,7 @@ func (pages *ContinuousDirtyPages) saveToStorage(reader io.Reader, offset int64,
 		defer pages.writeWaitGroup.Done()

 		reader = io.LimitReader(reader, size)
-		chunk, collection, replication, err := pages.f.wfs.saveDataAsChunk(pages.f.fullpath())(reader, pages.f.Name, offset)
+		chunk, collection, replication, err := pages.f.wfs.saveDataAsChunk(pages.f.fullpath(), pages.writeOnly)(reader, pages.f.Name, offset)
 		if err != nil {
 			glog.V(0).Infof("%s saveToStorage [%d,%d): %v", pages.f.fullpath(), offset, offset+size, err)
 			pages.lastErr = err
@@ -131,3 +144,17 @@ func min(x, y int64) int64 {
 func (pages *ContinuousDirtyPages) ReadDirtyDataAt(data []byte, startOffset int64) (maxStop int64) {
 	return pages.intervals.ReadDataAt(data, startOffset)
 }
+
+func (pages *ContinuousDirtyPages) GetStorageOptions() (collection, replication string) {
+	return pages.collection, pages.replication
+}
+
+func (pages *ContinuousDirtyPages) SetWriteOnly(writeOnly bool) {
+	if pages.writeOnly {
+		pages.writeOnly = writeOnly
+	}
+}
+
+func (pages *ContinuousDirtyPages) GetWriteOnly() (writeOnly bool) {
+	return pages.writeOnly
+}
@@ -0,0 +1,157 @@
+package filesys
+
+import (
+	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"io"
+	"os"
+	"sync"
+	"time"
+)
+
+type TempFileDirtyPages struct {
+	f                *File
+	tf               *os.File
+	writtenIntervals *WrittenContinuousIntervals
+	writeOnly        bool
+	writeWaitGroup   sync.WaitGroup
+	pageAddLock      sync.Mutex
+	chunkAddLock     sync.Mutex
+	lastErr          error
+	collection       string
+	replication      string
+}
+
+func newTempFileDirtyPages(file *File, writeOnly bool) *TempFileDirtyPages {
+
+	tempFile := &TempFileDirtyPages{
+		f:                file,
+		writeOnly:        writeOnly,
+		writtenIntervals: &WrittenContinuousIntervals{},
+	}
+
+	return tempFile
+}
+
+func (pages *TempFileDirtyPages) AddPage(offset int64, data []byte) {
+
+	pages.pageAddLock.Lock()
+	defer pages.pageAddLock.Unlock()
+
+	if pages.tf == nil {
+		tf, err := os.CreateTemp(pages.f.wfs.option.getTempFilePageDir(), "")
+		if err != nil {
+			glog.Errorf("create temp file: %v", err)
+			pages.lastErr = err
+			return
+		}
+		pages.tf = tf
+		pages.writtenIntervals.tempFile = tf
+		pages.writtenIntervals.lastOffset = 0
+	}
+
+	writtenOffset := pages.writtenIntervals.lastOffset
+	dataSize := int64(len(data))
+
+	// glog.V(4).Infof("%s AddPage %v at %d [%d,%d)", pages.f.fullpath(), pages.tf.Name(), writtenOffset, offset, offset+dataSize)
+
+	if _, err := pages.tf.WriteAt(data, writtenOffset); err != nil {
+		pages.lastErr = err
+	} else {
+		pages.writtenIntervals.AddInterval(writtenOffset, len(data), offset)
+		pages.writtenIntervals.lastOffset += dataSize
+	}
+
+	// pages.writtenIntervals.debug()
+
+	return
+}
+
+func (pages *TempFileDirtyPages) FlushData() error {
+
+	pages.saveExistingPagesToStorage()
+	pages.writeWaitGroup.Wait()
+	if pages.lastErr != nil {
+		return fmt.Errorf("flush data: %v", pages.lastErr)
+	}
+	pages.pageAddLock.Lock()
+	defer pages.pageAddLock.Unlock()
+	if pages.tf != nil {
+
+		pages.writtenIntervals.tempFile = nil
+		pages.writtenIntervals.lists = nil
+
+		pages.tf.Close()
+		os.Remove(pages.tf.Name())
+		pages.tf = nil
+	}
+	return nil
+}
+
+func (pages *TempFileDirtyPages) saveExistingPagesToStorage() {
+
+	pageSize := pages.f.wfs.option.ChunkSizeLimit
+
+	// glog.V(4).Infof("%v saveExistingPagesToStorage %d lists", pages.f.Name, len(pages.writtenIntervals.lists))
+
+	for _, list := range pages.writtenIntervals.lists {
+		listStopOffset := list.Offset() + list.Size()
+		for uploadedOffset:=int64(0); uploadedOffset < listStopOffset; uploadedOffset += pageSize {
+			start, stop := max(list.Offset(), uploadedOffset), min(listStopOffset, uploadedOffset+pageSize)
+			if start >= stop {
+				continue
+			}
+			// glog.V(4).Infof("uploading %v [%d,%d) %d/%d", pages.f.Name, start, stop, i, len(pages.writtenIntervals.lists))
+			pages.saveToStorage(list.ToReader(start, stop), start, stop-start)
+		}
+	}
+
+}
+
+func (pages *TempFileDirtyPages) saveToStorage(reader io.Reader, offset int64, size int64) {
+
+	mtime := time.Now().UnixNano()
+	pages.writeWaitGroup.Add(1)
+	writer := func() {
+		defer pages.writeWaitGroup.Done()
+
+		reader = io.LimitReader(reader, size)
+		chunk, collection, replication, err := pages.f.wfs.saveDataAsChunk(pages.f.fullpath(), pages.writeOnly)(reader, pages.f.Name, offset)
+		if err != nil {
+			glog.V(0).Infof("%s saveToStorage [%d,%d): %v", pages.f.fullpath(), offset, offset+size, err)
+			pages.lastErr = err
+			return
+		}
+		chunk.Mtime = mtime
+		pages.collection, pages.replication = collection, replication
+		pages.chunkAddLock.Lock()
+		defer pages.chunkAddLock.Unlock()
+		pages.f.addChunks([]*filer_pb.FileChunk{chunk})
+		glog.V(3).Infof("%s saveToStorage %s [%d,%d)", pages.f.fullpath(), chunk.FileId, offset, offset+size)
+	}
+
+	if pages.f.wfs.concurrentWriters != nil {
+		pages.f.wfs.concurrentWriters.Execute(writer)
+	} else {
+		go writer()
+	}
+}
+
+func (pages *TempFileDirtyPages) ReadDirtyDataAt(data []byte, startOffset int64) (maxStop int64) {
+	return pages.writtenIntervals.ReadDataAt(data, startOffset)
+}
+
+func (pages *TempFileDirtyPages) GetStorageOptions() (collection, replication string) {
+	return pages.collection, pages.replication
+}
+
+func (pages *TempFileDirtyPages) SetWriteOnly(writeOnly bool) {
+	if pages.writeOnly {
+		pages.writeOnly = writeOnly
+	}
+}
+
+func (pages *TempFileDirtyPages) GetWriteOnly() (writeOnly bool) {
+	return pages.writeOnly
+}
@@ -0,0 +1,289 @@
+package filesys
+
+import (
+	"io"
+	"log"
+	"os"
+)
+
+type WrittenIntervalNode struct {
+	DataOffset int64
+	TempOffset int64
+	Size       int64
+	Next       *WrittenIntervalNode
+}
+
+type WrittenIntervalLinkedList struct {
+	tempFile *os.File
+	Head     *WrittenIntervalNode
+	Tail     *WrittenIntervalNode
+}
+
+type WrittenContinuousIntervals struct {
+	tempFile   *os.File
+	lastOffset int64
+	lists      []*WrittenIntervalLinkedList
+}
+
+func (list *WrittenIntervalLinkedList) Offset() int64 {
+	return list.Head.DataOffset
+}
+func (list *WrittenIntervalLinkedList) Size() int64 {
+	return list.Tail.DataOffset + list.Tail.Size - list.Head.DataOffset
+}
+func (list *WrittenIntervalLinkedList) addNodeToTail(node *WrittenIntervalNode) {
+	// glog.V(4).Infof("add to tail [%d,%d) + [%d,%d) => [%d,%d)", list.Head.Offset, list.Tail.Offset+list.Tail.Size, node.Offset, node.Offset+node.Size, list.Head.Offset, node.Offset+node.Size)
+	if list.Tail.TempOffset+list.Tail.Size == node.TempOffset {
+		// already connected
+		list.Tail.Size += node.Size
+	} else {
+		list.Tail.Next = node
+		list.Tail = node
+	}
+}
+func (list *WrittenIntervalLinkedList) addNodeToHead(node *WrittenIntervalNode) {
+	// glog.V(4).Infof("add to head [%d,%d) + [%d,%d) => [%d,%d)", node.Offset, node.Offset+node.Size, list.Head.Offset, list.Tail.Offset+list.Tail.Size, node.Offset, list.Tail.Offset+list.Tail.Size)
+	node.Next = list.Head
+	list.Head = node
+}
+
+func (list *WrittenIntervalLinkedList) ReadData(buf []byte, start, stop int64) {
+	t := list.Head
+	for {
+
+		nodeStart, nodeStop := max(start, t.DataOffset), min(stop, t.DataOffset+t.Size)
+		if nodeStart < nodeStop {
+			// glog.V(4).Infof("copying start=%d stop=%d t=[%d,%d) => bufSize=%d nodeStart=%d, nodeStop=%d", start, stop, t.DataOffset, t.DataOffset+t.Size, len(buf), nodeStart, nodeStop)
+			list.tempFile.ReadAt(buf[nodeStart-start:nodeStop-start], t.TempOffset + nodeStart - t.DataOffset)
+		}
+
+		if t.Next == nil {
+			break
+		}
+		t = t.Next
+	}
+}
+
+func (c *WrittenContinuousIntervals) TotalSize() (total int64) {
+	for _, list := range c.lists {
+		total += list.Size()
+	}
+	return
+}
+
+func (list *WrittenIntervalLinkedList) subList(start, stop int64) *WrittenIntervalLinkedList {
+	var nodes []*WrittenIntervalNode
+	for t := list.Head; t != nil; t = t.Next {
+		nodeStart, nodeStop := max(start, t.DataOffset), min(stop, t.DataOffset+t.Size)
+		if nodeStart >= nodeStop {
+			// skip non overlapping WrittenIntervalNode
+			continue
+		}
+		nodes = append(nodes, &WrittenIntervalNode{
+			TempOffset: t.TempOffset + nodeStart - t.DataOffset,
+			DataOffset: nodeStart,
+			Size:       nodeStop - nodeStart,
+			Next:       nil,
+		})
+	}
+	for i := 1; i < len(nodes); i++ {
+		nodes[i-1].Next = nodes[i]
+	}
+	return &WrittenIntervalLinkedList{
+		tempFile: list.tempFile,
+		Head:     nodes[0],
+		Tail:     nodes[len(nodes)-1],
+	}
+}
+
+func (c *WrittenContinuousIntervals) debug() {
+	log.Printf("++")
+	for _, l := range c.lists {
+		log.Printf("++++")
+		for t := l.Head; ; t = t.Next {
+			log.Printf("[%d,%d) => [%d,%d) %d", t.DataOffset, t.DataOffset+t.Size, t.TempOffset, t.TempOffset+t.Size, t.Size)
+			if t.Next == nil {
+				break
+			}
+		}
+		log.Printf("----")
+	}
+	log.Printf("--")
+}
+
+func (c *WrittenContinuousIntervals) AddInterval(tempOffset int64, dataSize int, dataOffset int64) {
+
+	interval := &WrittenIntervalNode{DataOffset: dataOffset, TempOffset: tempOffset, Size: int64(dataSize)}
+
+	// append to the tail and return
+	if len(c.lists) == 1 {
+		lastSpan := c.lists[0]
+		if lastSpan.Tail.DataOffset+lastSpan.Tail.Size == dataOffset {
+			lastSpan.addNodeToTail(interval)
+			return
+		}
+	}
+
+	var newLists []*WrittenIntervalLinkedList
+	for _, list := range c.lists {
+		// if list is to the left of new interval, add to the new list
+		if list.Tail.DataOffset+list.Tail.Size <= interval.DataOffset {
+			newLists = append(newLists, list)
+		}
+		// if list is to the right of new interval, add to the new list
+		if interval.DataOffset+interval.Size <= list.Head.DataOffset {
+			newLists = append(newLists, list)
+		}
+		// if new interval overwrite the right part of the list
+		if list.Head.DataOffset < interval.DataOffset && interval.DataOffset < list.Tail.DataOffset+list.Tail.Size {
+			// create a new list of the left part of existing list
+			newLists = append(newLists, list.subList(list.Offset(), interval.DataOffset))
+		}
+		// if new interval overwrite the left part of the list
+		if list.Head.DataOffset < interval.DataOffset+interval.Size && interval.DataOffset+interval.Size < list.Tail.DataOffset+list.Tail.Size {
+			// create a new list of the right part of existing list
+			newLists = append(newLists, list.subList(interval.DataOffset+interval.Size, list.Tail.DataOffset+list.Tail.Size))
+		}
+		// skip anything that is fully overwritten by the new interval
+	}
+
+	c.lists = newLists
+	// add the new interval to the lists, connecting neighbor lists
+	var prevList, nextList *WrittenIntervalLinkedList
+
+	for _, list := range c.lists {
+		if list.Head.DataOffset == interval.DataOffset+interval.Size {
+			nextList = list
+			break
+		}
+	}
+
+	for _, list := range c.lists {
+		if list.Head.DataOffset+list.Size() == dataOffset {
+			list.addNodeToTail(interval)
+			prevList = list
+			break
+		}
+	}
+
+	if prevList != nil && nextList != nil {
+		// glog.V(4).Infof("connecting [%d,%d) + [%d,%d) => [%d,%d)", prevList.Head.Offset, prevList.Tail.Offset+prevList.Tail.Size, nextList.Head.Offset, nextList.Tail.Offset+nextList.Tail.Size, prevList.Head.Offset, nextList.Tail.Offset+nextList.Tail.Size)
+		prevList.Tail.Next = nextList.Head
+		prevList.Tail = nextList.Tail
+		c.removeList(nextList)
+	} else if nextList != nil {
+		// add to head was not done when checking
+		nextList.addNodeToHead(interval)
+	}
+	if prevList == nil && nextList == nil {
+		c.lists = append(c.lists, &WrittenIntervalLinkedList{
+			tempFile: c.tempFile,
+			Head:     interval,
+			Tail:     interval,
+		})
+	}
+
+	return
+}
+
+func (c *WrittenContinuousIntervals) RemoveLargestIntervalLinkedList() *WrittenIntervalLinkedList {
+	var maxSize int64
+	maxIndex := -1
+	for k, list := range c.lists {
+		if maxSize <= list.Size() {
+			maxSize = list.Size()
+			maxIndex = k
+		}
+	}
+	if maxSize <= 0 {
+		return nil
+	}
+
+	t := c.lists[maxIndex]
+	t.tempFile = c.tempFile
+	c.lists = append(c.lists[0:maxIndex], c.lists[maxIndex+1:]...)
+	return t
+
+}
+
+func (c *WrittenContinuousIntervals) removeList(target *WrittenIntervalLinkedList) {
+	index := -1
+	for k, list := range c.lists {
+		if list.Offset() == target.Offset() {
+			index = k
+		}
+	}
+	if index < 0 {
+		return
+	}
+
+	c.lists = append(c.lists[0:index], c.lists[index+1:]...)
+
+}
+
+func (c *WrittenContinuousIntervals) ReadDataAt(data []byte, startOffset int64) (maxStop int64) {
+	for _, list := range c.lists {
+		start := max(startOffset, list.Offset())
+		stop := min(startOffset+int64(len(data)), list.Offset()+list.Size())
+		if start < stop {
+			list.ReadData(data[start-startOffset:], start, stop)
+			maxStop = max(maxStop, stop)
+		}
+	}
+	return
+}
+
+func (l *WrittenIntervalLinkedList) ToReader(start int64, stop int64) io.Reader {
+	// TODO: optimize this to avoid another loop
+	var readers []io.Reader
+	for t := l.Head; ; t = t.Next {
+		startOffset, stopOffset := max(t.DataOffset, start), min(t.DataOffset+t.Size, stop)
+		if startOffset < stopOffset {
+			// glog.V(4).Infof("ToReader read [%d,%d) from [%d,%d) %d", t.DataOffset, t.DataOffset+t.Size, t.TempOffset, t.TempOffset+t.Size, t.Size)
+			readers = append(readers, newFileSectionReader(l.tempFile, startOffset-t.DataOffset+t.TempOffset, startOffset, stopOffset-startOffset))
+		}
+		if t.Next == nil {
+			break
+		}
+	}
+	if len(readers) == 1 {
+		return readers[0]
+	}
+	return io.MultiReader(readers...)
+}
+
+type FileSectionReader struct {
+	file            *os.File
+	tempStartOffset int64
+	Offset          int64
+	dataStart       int64
+	dataStop        int64
+}
+
+var _ = io.Reader(&FileSectionReader{})
+
+func newFileSectionReader(tempfile *os.File, offset int64, dataOffset int64, size int64) *FileSectionReader {
+	return &FileSectionReader{
+		file:            tempfile,
+		tempStartOffset: offset,
+		Offset:          offset,
+		dataStart:       dataOffset,
+		dataStop:        dataOffset + size,
+	}
+}
+
+func (f *FileSectionReader) Read(p []byte) (n int, err error) {
+	remaining := (f.dataStop - f.dataStart) - (f.Offset - f.tempStartOffset)
+	if remaining <= 0 {
+		return 0, io.EOF
+	}
+	dataLen := min(remaining, int64(len(p)))
+	// glog.V(4).Infof("reading [%d,%d) from %v [%d,%d)/[%d,%d) %d", f.Offset-f.tempStartOffset+f.dataStart, f.Offset-f.tempStartOffset+f.dataStart+dataLen, f.file.Name(), f.Offset, f.Offset+dataLen, f.tempStartOffset, f.tempStartOffset+f.dataStop-f.dataStart, f.dataStop-f.dataStart)
+	n, err = f.file.ReadAt(p[:dataLen], f.Offset)
+	if n > 0 {
+		f.Offset += int64(n)
+	} else {
+		err = io.EOF
+	}
+	return
+}
@@ -83,7 +83,7 @@ func (file *File) Attr(ctx context.Context, attr *fuse.Attr) (err error) {

 func (file *File) Getxattr(ctx context.Context, req *fuse.GetxattrRequest, resp *fuse.GetxattrResponse) error {

-	glog.V(4).Infof("file Getxattr %s", file.fullpath())
+	// glog.V(4).Infof("file Getxattr %s", file.fullpath())

 	entry, err := file.maybeLoadEntry(ctx)
 	if err != nil {
@@ -97,7 +97,7 @@ func (file *File) Open(ctx context.Context, req *fuse.OpenRequest, resp *fuse.Op

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

-	handle := file.wfs.AcquireHandle(file, req.Uid, req.Gid)
+	handle := file.wfs.AcquireHandle(file, req.Uid, req.Gid, req.Flags&fuse.OpenWriteOnly > 0)

 	resp.Handle = fuse.HandleID(handle.handle)

@@ -115,16 +115,6 @@ func (file *File) Setattr(ctx context.Context, req *fuse.SetattrRequest, resp *f
 	if err != nil {
 		return err
 	}
-	if file.isOpen > 0 {
-		file.wfs.handlesLock.Lock()
-		fileHandle := file.wfs.handles[file.Id()]
-		file.wfs.handlesLock.Unlock()
-
-		if fileHandle != nil {
-			fileHandle.Lock()
-			defer fileHandle.Unlock()
-		}
-	}

 	if req.Valid.Size() {

@@ -207,6 +197,11 @@ func (file *File) Setxattr(ctx context.Context, req *fuse.SetxattrRequest) error
 	if err := setxattr(entry, req); err != nil {
 		return err
 	}
+	file.dirtyMetadata = true
+
+	if file.isOpen > 0 {
+		return nil
+	}

 	return file.saveEntry(entry)

@@ -224,6 +219,11 @@ func (file *File) Removexattr(ctx context.Context, req *fuse.RemovexattrRequest)
 	if err := removexattr(entry, req); err != nil {
 		return err
 	}
+	file.dirtyMetadata = true
+
+	if file.isOpen > 0 {
+		return nil
+	}

 	return file.saveEntry(entry)

@@ -257,7 +257,7 @@ func (file *File) Fsync(ctx context.Context, req *fuse.FsyncRequest) error {
 func (file *File) Forget() {
 	t := util.NewFullPath(file.dir.FullPath(), file.Name)
 	glog.V(4).Infof("Forget file %s", t)
-	file.wfs.ReleaseHandle(t, 0)
+	file.wfs.ReleaseHandle(t, fuse.HandleID(t.AsInode()))
 }

 func (file *File) maybeLoadEntry(ctx context.Context) (entry *filer_pb.Entry, err error) {
@@ -265,8 +265,9 @@ func (file *File) maybeLoadEntry(ctx context.Context) (entry *filer_pb.Entry, er
 	file.wfs.handlesLock.Lock()
 	handle, found := file.wfs.handles[file.Id()]
 	file.wfs.handlesLock.Unlock()
+	entry = file.entry
 	if found {
-		glog.V(4).Infof("maybeLoadEntry found opened file %s/%s: %v %v", file.dir.FullPath(), file.Name, handle.f.entry, entry)
+		// glog.V(4).Infof("maybeLoadEntry found opened file %s/%s", file.dir.FullPath(), file.Name)
 		entry = handle.f.entry
 	}

@@ -335,20 +336,22 @@ func (file *File) saveEntry(entry *filer_pb.Entry) error {
 		file.wfs.mapPbIdFromLocalToFiler(entry)
 		defer file.wfs.mapPbIdFromFilerToLocal(entry)

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

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

-		file.wfs.metaCache.UpdateEntry(context.Background(), filer.FromPbEntry(request.Directory, request.Entry))
+		file.wfs.metaCache.InsertEntry(context.Background(), filer.FromPbEntry(request.Directory, request.Entry))
+
+		file.dirtyMetadata = false

 		return nil
 	})
@@ -20,7 +20,7 @@ import (

 type FileHandle struct {
 	// cache file has been written to
-	dirtyPages     *ContinuousDirtyPages
+	dirtyPages     DirtyPages
 	entryViewCache []filer.VisibleInterval
 	reader         io.ReaderAt
 	contentType    string
@@ -32,13 +32,14 @@ type FileHandle struct {
 	NodeId    fuse.NodeID    // file or directory the request is about
 	Uid       uint32         // user ID of process making request
 	Gid       uint32         // group ID of process making request
-
+	writeOnly bool
 }

-func newFileHandle(file *File, uid, gid uint32) *FileHandle {
+func newFileHandle(file *File, uid, gid uint32, writeOnly bool) *FileHandle {
 	fh := &FileHandle{
 		f:          file,
-		dirtyPages: newDirtyPages(file),
+		// dirtyPages: newContinuousDirtyPages(file, writeOnly),
+		dirtyPages: newTempFileDirtyPages(file, writeOnly),
 		Uid:        uid,
 		Gid:        gid,
 	}
@@ -148,7 +149,7 @@ func (fh *FileHandle) readFromChunks(buff []byte, offset int64) (int64, error) {
 		glog.Errorf("file handle read %s: %v", fileFullPath, err)
 	}

-	glog.V(4).Infof("file handle read %s [%d,%d] %d : %v", fileFullPath, 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
 }
@@ -174,7 +175,7 @@ func (fh *FileHandle) Write(ctx context.Context, req *fuse.WriteRequest, resp *f

 	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))
+	// 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)

@@ -200,13 +201,7 @@ func (fh *FileHandle) Release(ctx context.Context, req *fuse.ReleaseRequest) err

 	fh.f.isOpen--

-	if fh.f.isOpen < 0 {
-		glog.V(0).Infof("Release reset %s open count %d => %d", fh.f.Name, fh.f.isOpen, 0)
-		fh.f.isOpen = 0
-		return nil
-	}
-
-	if fh.f.isOpen == 0 {
+	if fh.f.isOpen <= 0 {
 		fh.f.entry = nil
 		fh.entryViewCache = nil
 		fh.reader = nil
@@ -214,6 +209,12 @@ func (fh *FileHandle) Release(ctx context.Context, req *fuse.ReleaseRequest) err
 		fh.f.wfs.ReleaseHandle(fh.f.fullpath(), fuse.HandleID(fh.handle))
 	}

+	if fh.f.isOpen < 0 {
+		glog.V(0).Infof("Release reset %s open count %d => %d", fh.f.Name, fh.f.isOpen, 0)
+		fh.f.isOpen = 0
+		return nil
+	}
+
 	return nil
 }

@@ -238,12 +239,8 @@ func (fh *FileHandle) doFlush(ctx context.Context, header fuse.Header) error {
 	// send the data to the OS
 	glog.V(4).Infof("doFlush %s fh %d", fh.f.fullpath(), fh.handle)

-	fh.dirtyPages.saveExistingPagesToStorage()
-
-	fh.dirtyPages.writeWaitGroup.Wait()
-
-	if fh.dirtyPages.lastErr != nil {
-		glog.Errorf("%v doFlush last err: %v", fh.f.fullpath(), fh.dirtyPages.lastErr)
+	if err := fh.dirtyPages.FlushData(); err != nil {
+		glog.Errorf("%v doFlush: %v", fh.f.fullpath(), err)
 		return fuse.EIO
 	}

@@ -271,8 +268,7 @@ func (fh *FileHandle) doFlush(ctx context.Context, header fuse.Header) error {
 			}
 			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
+			entry.Attributes.Collection, entry.Attributes.Replication = fh.dirtyPages.GetStorageOptions()
 		}

 		request := &filer_pb.CreateEntryRequest{
@@ -289,7 +285,7 @@ func (fh *FileHandle) doFlush(ctx context.Context, header fuse.Header) error {
 		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)
+		chunks, manifestErr := filer.MaybeManifestize(fh.f.wfs.saveDataAsChunk(fh.f.fullpath(), fh.dirtyPages.GetWriteOnly()), chunks)
 		if manifestErr != nil {
 			// not good, but should be ok
 			glog.V(0).Infof("MaybeManifestize: %v", manifestErr)
@@ -4,7 +4,6 @@ import (
 	"context"
 	"fmt"
 	"os"
-	"strings"
 	"sync"

 	"github.com/chrislusf/seaweedfs/weed/filer"
@@ -31,9 +30,6 @@ func NewMetaCache(dbFolder string, baseDir util.FullPath, uidGidMapper *UidGidMa
 		visitedBoundary: bounded_tree.NewBoundedTree(baseDir),
 		uidGidMapper:    uidGidMapper,
 		invalidateFunc: func(fullpath util.FullPath) {
-			if baseDir != "/" && strings.HasPrefix(string(fullpath), string(baseDir)) {
-				fullpath = fullpath[len(baseDir):]
-			}
 			invalidateFunc(fullpath)
 		},
 	}
@@ -78,7 +74,7 @@ func (mc *MetaCache) AtomicUpdateEntryFromFiler(ctx context.Context, oldPath uti
 				// skip the unnecessary deletion
 				// leave the update to the following InsertEntry operation
 			} else {
-				glog.V(3).Infof("DeleteEntry %s/%s", oldPath, oldPath.Name())
+				glog.V(3).Infof("DeleteEntry %s", oldPath)
 				if err := mc.localStore.DeleteEntry(ctx, oldPath); err != nil {
 					return err
 				}
@@ -17,9 +17,9 @@ func EnsureVisited(mc *MetaCache, client filer_pb.FilerClient, dirPath util.Full
 		glog.V(4).Infof("ReadDirAllEntries %s ...", path)

 		util.Retry("ReadDirAllEntries", func() error {
-			err = filer_pb.ReadDirAllEntries(client, dirPath, "", func(pbEntry *filer_pb.Entry, isLast bool) error {
-				entry := filer.FromPbEntry(string(dirPath), pbEntry)
-				if IsHiddenSystemEntry(string(dirPath), entry.Name()) {
+			err = filer_pb.ReadDirAllEntries(client, path, "", func(pbEntry *filer_pb.Entry, isLast bool) error {
+				entry := filer.FromPbEntry(string(path), pbEntry)
+				if IsHiddenSystemEntry(string(path), entry.Name()) {
 					return nil
 				}
 				if err := mc.doInsertEntry(context.Background(), entry); err != nil {
@@ -35,7 +35,7 @@ func EnsureVisited(mc *MetaCache, client filer_pb.FilerClient, dirPath util.Full
 		})

 		if err != nil {
-			err = fmt.Errorf("list %s: %v", dirPath, err)
+			err = fmt.Errorf("list %s: %v", path, err)
 		}

 		return
@@ -40,9 +40,22 @@ func SubscribeMetaEvents(mc *MetaCache, selfSignature int32, client filer_pb.Fil
 			newEntry = filer.FromPbEntry(dir, message.NewEntry)
 		}
 		err := mc.AtomicUpdateEntryFromFiler(context.Background(), oldPath, newEntry)
-		if err == nil && message.OldEntry != nil && message.NewEntry != nil {
-			key := util.NewFullPath(dir, message.NewEntry.Name)
-			mc.invalidateFunc(key)
+		if err == nil {
+			if message.OldEntry != nil && message.NewEntry != nil {
+				if message.OldEntry.Name == message.NewEntry.Name {
+					// no need to invalidate
+				} else {
+					oldKey := util.NewFullPath(resp.Directory, message.OldEntry.Name)
+					mc.invalidateFunc(oldKey)
+					newKey := util.NewFullPath(dir, message.NewEntry.Name)
+					mc.invalidateFunc(newKey)
+				}
+			} else if message.OldEntry == nil && message.NewEntry != nil {
+				// no need to invaalidate
+			} else if message.OldEntry != nil && message.NewEntry == nil {
+				oldKey := util.NewFullPath(resp.Directory, message.OldEntry.Name)
+				mc.invalidateFunc(oldKey)
+			}
 		}

 		return err
@@ -3,14 +3,17 @@ package filesys
 import (
 	"context"
 	"fmt"
+	"math"
+	"math/rand"
+	"os"
+	"path"
+	"path/filepath"
+	"sync"
+	"time"
+
 	"github.com/chrislusf/seaweedfs/weed/filer"
 	"github.com/chrislusf/seaweedfs/weed/storage/types"
 	"github.com/chrislusf/seaweedfs/weed/wdclient"
-	"math"
-	"os"
-	"path"
-	"sync"
-	"time"

 	"google.golang.org/grpc"

@@ -28,8 +31,9 @@ import (

 type Option struct {
 	MountDirectory     string
-	FilerAddress       string
-	FilerGrpcAddress   string
+	FilerAddresses     []string
+	filerIndex         int
+	FilerGrpcAddresses []string
 	GrpcDialOption     grpc.DialOption
 	FilerMountRootPath string
 	Collection         string
@@ -43,15 +47,19 @@ type Option struct {
 	DataCenter         string
 	Umask              os.FileMode

-	MountUid   uint32
-	MountGid   uint32
-	MountMode  os.FileMode
-	MountCtime time.Time
-	MountMtime time.Time
+	MountUid         uint32
+	MountGid         uint32
+	MountMode        os.FileMode
+	MountCtime       time.Time
+	MountMtime       time.Time
+	MountParentInode uint64

 	VolumeServerAccess string // how to access volume servers
 	Cipher             bool   // whether encrypt data on volume server
 	UidGidMapper       *meta_cache.UidGidMapper
+
+	uniqueCacheDir         string
+	uniqueCacheTempPageDir string
 }

 var _ = fs.FS(&WFS{})
@@ -95,14 +103,13 @@ func NewSeaweedFileSystem(option *Option) *WFS {
 		},
 		signature: util.RandomInt32(),
 	}
-	cacheUniqueId := util.Md5String([]byte(option.MountDirectory + option.FilerGrpcAddress + option.FilerMountRootPath + util.Version()))[0:8]
-	cacheDir := path.Join(option.CacheDir, cacheUniqueId)
+	wfs.option.filerIndex = rand.Intn(len(option.FilerAddresses))
+	wfs.option.setupUniqueCacheDirectory()
 	if option.CacheSizeMB > 0 {
-		os.MkdirAll(cacheDir, os.FileMode(0777)&^option.Umask)
-		wfs.chunkCache = chunk_cache.NewTieredChunkCache(256, cacheDir, option.CacheSizeMB, 1024*1024)
+		wfs.chunkCache = chunk_cache.NewTieredChunkCache(256, option.getUniqueCacheDir(), option.CacheSizeMB, 1024*1024)
 	}

-	wfs.metaCache = meta_cache.NewMetaCache(path.Join(cacheDir, "meta"), util.FullPath(option.FilerMountRootPath), option.UidGidMapper, func(filePath util.FullPath) {
+	wfs.metaCache = meta_cache.NewMetaCache(path.Join(option.getUniqueCacheDir(), "meta"), util.FullPath(option.FilerMountRootPath), option.UidGidMapper, func(filePath util.FullPath) {

 		fsNode := NodeWithId(filePath.AsInode())
 		if err := wfs.Server.InvalidateNodeData(fsNode); err != nil {
@@ -111,17 +118,18 @@ func NewSeaweedFileSystem(option *Option) *WFS {

 		dir, name := filePath.DirAndName()
 		parent := NodeWithId(util.FullPath(dir).AsInode())
+		if dir == option.FilerMountRootPath {
+			parent = NodeWithId(1)
+		}
 		if err := wfs.Server.InvalidateEntry(parent, name); err != nil {
 			glog.V(4).Infof("InvalidateEntry %s : %v", filePath, err)
 		}
 	})
-	startTime := time.Now()
-	go meta_cache.SubscribeMetaEvents(wfs.metaCache, wfs.signature, wfs, wfs.option.FilerMountRootPath, startTime.UnixNano())
 	grace.OnInterrupt(func() {
 		wfs.metaCache.Shutdown()
 	})

-	wfs.root = &Dir{name: wfs.option.FilerMountRootPath, wfs: wfs}
+	wfs.root = &Dir{name: wfs.option.FilerMountRootPath, wfs: wfs, id: 1}
 	wfs.fsNodeCache = newFsCache(wfs.root)

 	if wfs.option.ConcurrentWriters > 0 {
@@ -131,11 +139,16 @@ func NewSeaweedFileSystem(option *Option) *WFS {
 	return wfs
 }

+func (wfs *WFS) StartBackgroundTasks() {
+	startTime := time.Now()
+	go meta_cache.SubscribeMetaEvents(wfs.metaCache, wfs.signature, wfs, wfs.option.FilerMountRootPath, startTime.UnixNano())
+}
+
 func (wfs *WFS) Root() (fs.Node, error) {
 	return wfs.root, nil
 }

-func (wfs *WFS) AcquireHandle(file *File, uid, gid uint32) (fileHandle *FileHandle) {
+func (wfs *WFS) AcquireHandle(file *File, uid, gid uint32, writeOnly bool) (fileHandle *FileHandle) {

 	fullpath := file.fullpath()
 	glog.V(4).Infof("AcquireHandle %s uid=%d gid=%d", fullpath, uid, gid)
@@ -147,13 +160,14 @@ func (wfs *WFS) AcquireHandle(file *File, uid, gid uint32) (fileHandle *FileHand
 	wfs.handlesLock.Unlock()
 	if found && existingHandle != nil {
 		existingHandle.f.isOpen++
+		existingHandle.dirtyPages.SetWriteOnly(writeOnly)
 		glog.V(4).Infof("Acquired Handle %s open %d", fullpath, existingHandle.f.isOpen)
 		return existingHandle
 	}

 	entry, _ := file.maybeLoadEntry(context.Background())
 	file.entry = entry
-	fileHandle = newFileHandle(file, uid, gid)
+	fileHandle = newFileHandle(file, uid, gid, writeOnly)
 	file.isOpen++

 	wfs.handlesLock.Lock()
@@ -255,14 +269,31 @@ func (wfs *WFS) mapPbIdFromLocalToFiler(entry *filer_pb.Entry) {
 func (wfs *WFS) LookupFn() wdclient.LookupFileIdFunctionType {
 	if wfs.option.VolumeServerAccess == "filerProxy" {
 		return func(fileId string) (targetUrls []string, err error) {
-			return []string{"http://" + wfs.option.FilerAddress + "/?proxyChunkId=" + fileId}, nil
+			return []string{"http://" + wfs.getCurrentFiler() + "/?proxyChunkId=" + fileId}, nil
 		}
 	}
 	return filer.LookupFn(wfs)
+}
+func (wfs *WFS) getCurrentFiler() string {
+	return wfs.option.FilerAddresses[wfs.option.filerIndex]
+}

+func (option *Option) setupUniqueCacheDirectory() {
+	cacheUniqueId := util.Md5String([]byte(option.MountDirectory + option.FilerGrpcAddresses[0] + option.FilerMountRootPath + util.Version()))[0:8]
+	option.uniqueCacheDir = path.Join(option.CacheDir, cacheUniqueId)
+	option.uniqueCacheTempPageDir = filepath.Join(option.uniqueCacheDir, "sw")
+	os.MkdirAll(option.uniqueCacheTempPageDir, os.FileMode(0777)&^option.Umask)
+}
+
+func (option *Option) getTempFilePageDir() string {
+	return option.uniqueCacheTempPageDir
+}
+func (option *Option) getUniqueCacheDir() string {
+	return option.uniqueCacheDir
 }

 type NodeWithId uint64
+
 func (n NodeWithId) Id() uint64 {
 	return uint64(n)
 }
@@ -1,6 +1,7 @@
 package filesys

 import (
+	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/util"
 	"google.golang.org/grpc"

@@ -10,20 +11,36 @@ import (

 var _ = filer_pb.FilerClient(&WFS{})

-func (wfs *WFS) WithFilerClient(fn func(filer_pb.SeaweedFilerClient) error) error {
+func (wfs *WFS) WithFilerClient(fn func(filer_pb.SeaweedFilerClient) error) (err error) {

-	err := util.Retry("filer grpc "+wfs.option.FilerGrpcAddress, func() error {
-		return pb.WithCachedGrpcClient(func(grpcConnection *grpc.ClientConn) error {
-			client := filer_pb.NewSeaweedFilerClient(grpcConnection)
-			return fn(client)
-		}, wfs.option.FilerGrpcAddress, wfs.option.GrpcDialOption)
+	return util.Retry("filer grpc", func() error {
+
+		i := wfs.option.filerIndex
+		n := len(wfs.option.FilerGrpcAddresses)
+		for x := 0; x < n; x++ {
+
+			filerGrpcAddress := wfs.option.FilerGrpcAddresses[i]
+			err = pb.WithCachedGrpcClient(func(grpcConnection *grpc.ClientConn) error {
+				client := filer_pb.NewSeaweedFilerClient(grpcConnection)
+				return fn(client)
+			}, filerGrpcAddress, wfs.option.GrpcDialOption)
+
+			if err != nil {
+				glog.V(0).Infof("WithFilerClient %d %v: %v", x, filerGrpcAddress, err)
+			} else {
+				wfs.option.filerIndex = i
+				return nil
+			}
+
+			i++
+			if i >= n {
+				i = 0
+			}
+
+		}
+		return err
 	})

-	if err == nil {
-		return nil
-	}
-	return err
-
 }

 func (wfs *WFS) AdjustedUrl(location *filer_pb.Location) string {
@@ -13,49 +13,50 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/util"
 )

-func (wfs *WFS) saveDataAsChunk(fullPath util.FullPath) filer.SaveDataAsChunkFunctionType {
+func (wfs *WFS) saveDataAsChunk(fullPath util.FullPath, writeOnly bool) filer.SaveDataAsChunkFunctionType {

 	return func(reader io.Reader, filename string, offset int64) (chunk *filer_pb.FileChunk, collection, replication string, err error) {
 		var fileId, host string
 		var auth security.EncodedJwt

 		if err := wfs.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
+			return util.Retry("assignVolume", func() error {
+				request := &filer_pb.AssignVolumeRequest{
+					Count:       1,
+					Replication: wfs.option.Replication,
+					Collection:  wfs.option.Collection,
+					TtlSec:      wfs.option.TtlSec,
+					DiskType:    string(wfs.option.DiskType),
+					DataCenter:  wfs.option.DataCenter,
+					Path:        string(fullPath),
+				}

-			request := &filer_pb.AssignVolumeRequest{
-				Count:       1,
-				Replication: wfs.option.Replication,
-				Collection:  wfs.option.Collection,
-				TtlSec:      wfs.option.TtlSec,
-				DiskType:    string(wfs.option.DiskType),
-				DataCenter:  wfs.option.DataCenter,
-				Path:        string(fullPath),
-			}
+				resp, err := client.AssignVolume(context.Background(), request)
+				if err != nil {
+					glog.V(0).Infof("assign volume failure %v: %v", request, err)
+					return err
+				}
+				if resp.Error != "" {
+					return fmt.Errorf("assign volume failure %v: %v", request, resp.Error)
+				}

-			resp, err := client.AssignVolume(context.Background(), request)
-			if err != nil {
-				glog.V(0).Infof("assign volume failure %v: %v", request, err)
-				return err
-			}
-			if resp.Error != "" {
-				return fmt.Errorf("assign volume failure %v: %v", request, resp.Error)
-			}
+				fileId, auth = resp.FileId, security.EncodedJwt(resp.Auth)
+				loc := &filer_pb.Location{
+					Url:       resp.Url,
+					PublicUrl: resp.PublicUrl,
+				}
+				host = wfs.AdjustedUrl(loc)
+				collection, replication = resp.Collection, resp.Replication

-			fileId, auth = resp.FileId, security.EncodedJwt(resp.Auth)
-			loc := &filer_pb.Location{
-				Url:       resp.Url,
-				PublicUrl: resp.PublicUrl,
-			}
-			host = wfs.AdjustedUrl(loc)
-			collection, replication = resp.Collection, resp.Replication
-
-			return nil
+				return nil
+			})
 		}); err != nil {
 			return nil, "", "", fmt.Errorf("filerGrpcAddress assign volume: %v", err)
 		}

 		fileUrl := fmt.Sprintf("http://%s/%s", host, fileId)
 		if wfs.option.VolumeServerAccess == "filerProxy" {
-			fileUrl = fmt.Sprintf("http://%s/?proxyChunkId=%s", wfs.option.FilerAddress, fileId)
+			fileUrl = fmt.Sprintf("http://%s/?proxyChunkId=%s", wfs.getCurrentFiler(), fileId)
 		}
 		uploadResult, err, data := operation.Upload(fileUrl, filename, wfs.option.Cipher, reader, false, "", nil, auth)
 		if err != nil {
@@ -67,7 +68,9 @@ func (wfs *WFS) saveDataAsChunk(fullPath util.FullPath) filer.SaveDataAsChunkFun
 			return nil, "", "", fmt.Errorf("upload result: %v", uploadResult.Error)
 		}

-		wfs.chunkCache.SetChunk(fileId, data)
+		if !writeOnly {
+			wfs.chunkCache.SetChunk(fileId, data)
+		}

 		chunk = uploadResult.ToPbFileChunk(fileId, offset)
 		return chunk, collection, replication, nil
@@ -113,6 +113,21 @@ func (wfs *WFS) maybeLoadEntry(dir, name string) (entry *filer_pb.Entry, err err
 	fullpath := util.NewFullPath(dir, name)
 	// glog.V(3).Infof("read entry cache miss %s", fullpath)

+	// return a valid entry for the mount root
+	if string(fullpath) == wfs.option.FilerMountRootPath {
+		return &filer_pb.Entry{
+			Name:        wfs.option.FilerMountRootPath,
+			IsDirectory: true,
+			Attributes: &filer_pb.FuseAttributes{
+				Mtime:    wfs.option.MountMtime.Unix(),
+				FileMode: uint32(wfs.option.MountMode),
+				Uid:      wfs.option.MountUid,
+				Gid:      wfs.option.MountGid,
+				Crtime:   wfs.option.MountCtime.Unix(),
+			},
+		}, nil
+	}
+
 	// read from async meta cache
 	meta_cache.EnsureVisited(wfs.metaCache, wfs, util.FullPath(dir))
 	cachedEntry, cacheErr := wfs.metaCache.FindEntry(context.Background(), fullpath)
@@ -114,7 +114,11 @@ func (iama *IamApiServer) ListUsers(s3cfg *iam_pb.S3ApiConfiguration, values url

 func (iama *IamApiServer) ListAccessKeys(s3cfg *iam_pb.S3ApiConfiguration, values url.Values) (resp ListAccessKeysResponse) {
 	status := iam.StatusTypeActive
+	userName := values.Get("UserName")
 	for _, ident := range s3cfg.Identities {
+		if userName != "" && userName != ident.Name {
+			continue
+		}
 		for _, cred := range ident.Credentials {
 			resp.ListAccessKeysResult.AccessKeyMetadata = append(resp.ListAccessKeysResult.AccessKeyMetadata,
 				&iam.AccessKeyMetadata{UserName: &ident.Name, AccessKeyId: &cred.AccessKey, Status: &status},
@@ -3,6 +3,7 @@ package broker
 import (
 	"context"
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/security"
 	"io"

 	"github.com/chrislusf/seaweedfs/weed/glog"
@@ -10,7 +11,6 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/pb"
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
 	"github.com/chrislusf/seaweedfs/weed/pb/messaging_pb"
-	"github.com/chrislusf/seaweedfs/weed/security"
 	"github.com/chrislusf/seaweedfs/weed/util"
 )

@@ -53,26 +53,33 @@ func (broker *MessageBroker) assignAndUpload(topicConfig *messaging_pb.TopicConf
 	// assign a volume location
 	if err := broker.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {

-		request := &filer_pb.AssignVolumeRequest{
-			Count:       1,
-			Replication: topicConfig.Replication,
-			Collection:  topicConfig.Collection,
-		}
+		assignErr := util.Retry("assignVolume", func() error {
+			request := &filer_pb.AssignVolumeRequest{
+				Count:       1,
+				Replication: topicConfig.Replication,
+				Collection:  topicConfig.Collection,
+			}

-		resp, err := client.AssignVolume(context.Background(), request)
-		if err != nil {
-			glog.V(0).Infof("assign volume failure %v: %v", request, err)
-			return err
-		}
-		if resp.Error != "" {
-			return fmt.Errorf("assign volume failure %v: %v", request, resp.Error)
-		}
+			resp, err := client.AssignVolume(context.Background(), request)
+			if err != nil {
+				glog.V(0).Infof("assign volume failure %v: %v", request, err)
+				return err
+			}
+			if resp.Error != "" {
+				return fmt.Errorf("assign volume failure %v: %v", request, resp.Error)
+			}

-		assignResult.Auth = security.EncodedJwt(resp.Auth)
-		assignResult.Fid = resp.FileId
-		assignResult.Url = resp.Url
-		assignResult.PublicUrl = resp.PublicUrl
-		assignResult.Count = uint64(resp.Count)
+			assignResult.Auth = security.EncodedJwt(resp.Auth)
+			assignResult.Fid = resp.FileId
+			assignResult.Url = resp.Url
+			assignResult.PublicUrl = resp.PublicUrl
+			assignResult.Count = uint64(resp.Count)
+
+			return nil
+		})
+		if assignErr != nil {
+			return assignErr
+		}

 		return nil
 	}); err != nil {
@@ -18,7 +18,7 @@ type MockClient struct {
 }

 func (m *MockClient) Do(req *http.Request) (*http.Response, error) {
-	n, originalSize, _, err := needle.CreateNeedleFromRequest(req, false, 1024*1024)
+	n, originalSize, _, err := needle.CreateNeedleFromRequest(req, false, 1024*1024, &bytes.Buffer{})
 	if m.needleHandling != nil {
 		m.needleHandling(n, originalSize, err)
 	}
@@ -39,7 +39,7 @@ func (uploadResult *UploadResult) ToPbFileChunk(fileId string, offset int64) *fi
 		Offset:       offset,
 		Size:         uint64(uploadResult.Size),
 		Mtime:        time.Now().UnixNano(),
-		ETag:         uploadResult.ETag,
+		ETag:         uploadResult.ContentMd5,
 		CipherKey:    uploadResult.CipherKey,
 		IsCompressed: uploadResult.Gzip > 0,
 		Fid:          fid,
@@ -361,6 +361,7 @@ message FilerConf {
        string disk_type = 5;
        bool fsync = 6;
        uint32 volume_growth_count = 7;
+        bool read_only = 8;
    }
    repeated PathConf locations = 2;
 }
@@ -3135,6 +3135,7 @@ type FilerConf_PathConf struct {
 	DiskType          string `protobuf:"bytes,5,opt,name=disk_type,json=diskType,proto3" json:"disk_type,omitempty"`
 	Fsync             bool   `protobuf:"varint,6,opt,name=fsync,proto3" json:"fsync,omitempty"`
 	VolumeGrowthCount uint32 `protobuf:"varint,7,opt,name=volume_growth_count,json=volumeGrowthCount,proto3" json:"volume_growth_count,omitempty"`
+	ReadOnly          bool   `protobuf:"varint,8,opt,name=read_only,json=readOnly,proto3" json:"read_only,omitempty"`
 }

 func (x *FilerConf_PathConf) Reset() {
@@ -3218,6 +3219,13 @@ func (x *FilerConf_PathConf) GetVolumeGrowthCount() uint32 {
 	return 0
 }

+func (x *FilerConf_PathConf) GetReadOnly() bool {
+	if x != nil {
+		return x.ReadOnly
+	}
+	return false
+}
+
 var File_filer_proto protoreflect.FileDescriptor

 var file_filer_proto_rawDesc = []byte{
@@ -3594,13 +3602,13 @@ var file_filer_proto_rawDesc = []byte{
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@@ -3615,114 +3623,116 @@ var file_filer_proto_rawDesc = []byte{
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 }

 var (
@@ -4,6 +4,7 @@ import (
 	"context"
 	"fmt"
 	"github.com/chrislusf/seaweedfs/weed/glog"
+	"math/rand"
 	"net/http"
 	"strconv"
 	"strings"
@@ -24,10 +25,16 @@ const (

 var (
 	// cache grpc connections
-	grpcClients     = make(map[string]*grpc.ClientConn)
+	grpcClients     = make(map[string]*versionedGrpcClient)
 	grpcClientsLock sync.Mutex
 )

+type versionedGrpcClient struct {
+	*grpc.ClientConn
+	version  int
+	errCount int
+}
+
 func init() {
 	http.DefaultTransport.(*http.Transport).MaxIdleConnsPerHost = 1024
 	http.DefaultTransport.(*http.Transport).MaxIdleConns = 1024
@@ -43,7 +50,7 @@ func NewGrpcServer(opts ...grpc.ServerOption) *grpc.Server {
 		}),
 		grpc.KeepaliveEnforcementPolicy(keepalive.EnforcementPolicy{
 			MinTime:             60 * time.Second, // min time a client should wait before sending a ping
-			PermitWithoutStream: false,
+			PermitWithoutStream: true,
 		}),
 		grpc.MaxRecvMsgSize(Max_Message_Size),
 		grpc.MaxSendMsgSize(Max_Message_Size),
@@ -69,7 +76,7 @@ func GrpcDial(ctx context.Context, address string, opts ...grpc.DialOption) (*gr
 		grpc.WithKeepaliveParams(keepalive.ClientParameters{
 			Time:                30 * time.Second, // client ping server if no activity for this long
 			Timeout:             20 * time.Second,
-			PermitWithoutStream: false,
+			PermitWithoutStream: true,
 		}))
 	for _, opt := range opts {
 		if opt != nil {
@@ -79,7 +86,7 @@ func GrpcDial(ctx context.Context, address string, opts ...grpc.DialOption) (*gr
 	return grpc.DialContext(ctx, address, options...)
 }

-func getOrCreateConnection(address string, opts ...grpc.DialOption) (*grpc.ClientConn, error) {
+func getOrCreateConnection(address string, opts ...grpc.DialOption) (*versionedGrpcClient, error) {

 	grpcClientsLock.Lock()
 	defer grpcClientsLock.Unlock()
@@ -94,23 +101,55 @@ func getOrCreateConnection(address string, opts ...grpc.DialOption) (*grpc.Clien
 		return nil, fmt.Errorf("fail to dial %s: %v", address, err)
 	}

-	grpcClients[address] = grpcConnection
+	vgc := &versionedGrpcClient{
+		grpcConnection,
+		rand.Int(),
+		0,
+	}
+	grpcClients[address] = vgc

-	return grpcConnection, nil
+	return vgc, nil
 }

 func WithCachedGrpcClient(fn func(*grpc.ClientConn) error, address string, opts ...grpc.DialOption) error {

-	grpcConnection, err := getOrCreateConnection(address, opts...)
+	vgc, err := getOrCreateConnection(address, opts...)
 	if err != nil {
 		return fmt.Errorf("getOrCreateConnection %s: %v", address, err)
 	}
-	return fn(grpcConnection)
+	executionErr := fn(vgc.ClientConn)
+	if executionErr != nil {
+		vgc.errCount++
+		if vgc.errCount > 3 ||
+			strings.Contains(executionErr.Error(), "transport") ||
+			strings.Contains(executionErr.Error(), "connection closed") {
+			grpcClientsLock.Lock()
+			if t, ok := grpcClients[address]; ok {
+				if t.version == vgc.version {
+					vgc.Close()
+					delete(grpcClients, address)
+				}
+			}
+			grpcClientsLock.Unlock()
+		}
+	}
+
+	return executionErr
 }

 func ParseServerToGrpcAddress(server string) (serverGrpcAddress string, err error) {
 	return ParseServerAddress(server, 10000)
 }
+func ParseServersToGrpcAddresses(servers []string) (serverGrpcAddresses []string, err error) {
+	for _, server := range servers {
+		if serverGrpcAddress, parseErr := ParseServerToGrpcAddress(server); parseErr == nil {
+			serverGrpcAddresses = append(serverGrpcAddresses, serverGrpcAddress)
+		} else {
+			return nil, parseErr
+		}
+	}
+	return
+}

 func ParseServerAddress(server string, deltaPort int) (newServerAddress string, err error) {

@@ -202,3 +241,18 @@ func WithGrpcFilerClient(filerGrpcAddress string, grpcDialOption grpc.DialOption
 	}, filerGrpcAddress, grpcDialOption)

 }
+
+func WithOneOfGrpcFilerClients(filerGrpcAddresses []string, grpcDialOption grpc.DialOption, fn func(client filer_pb.SeaweedFilerClient) error) (err error) {
+
+	for _, filerGrpcAddress := range filerGrpcAddresses {
+		err = WithCachedGrpcClient(func(grpcConnection *grpc.ClientConn) error {
+			client := filer_pb.NewSeaweedFilerClient(grpcConnection)
+			return fn(client)
+		}, filerGrpcAddress, grpcDialOption)
+		if err == nil {
+			return nil
+		}
+	}
+
+	return err
+}
@@ -288,6 +288,7 @@ message LeaseAdminTokenRequest {
    int64 previous_token = 1;
    int64 previous_lock_time = 2;
    string lock_name = 3;
+    string client_name = 4;
 }
 message LeaseAdminTokenResponse {
    int64 token = 1;
@@ -2468,6 +2468,7 @@ type LeaseAdminTokenRequest struct {
 	PreviousToken    int64  `protobuf:"varint,1,opt,name=previous_token,json=previousToken,proto3" json:"previous_token,omitempty"`
 	PreviousLockTime int64  `protobuf:"varint,2,opt,name=previous_lock_time,json=previousLockTime,proto3" json:"previous_lock_time,omitempty"`
 	LockName         string `protobuf:"bytes,3,opt,name=lock_name,json=lockName,proto3" json:"lock_name,omitempty"`
+	ClientName       string `protobuf:"bytes,4,opt,name=client_name,json=clientName,proto3" json:"client_name,omitempty"`
 }

 func (x *LeaseAdminTokenRequest) Reset() {
@@ -2523,6 +2524,13 @@ func (x *LeaseAdminTokenRequest) GetLockName() string {
 	return ""
 }

+func (x *LeaseAdminTokenRequest) GetClientName() string {
+	if x != nil {
+		return x.ClientName
+	}
+	return ""
+}
+
 type LeaseAdminTokenResponse struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -3268,7 +3276,7 @@ var file_master_proto_rawDesc = []byte{
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@@ -3277,103 +3285,105 @@ var file_master_proto_rawDesc = []byte{
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 }

 var (
@@ -129,8 +129,7 @@ func (g *AzureSink) CreateEntry(key string, entry *filer_pb.Entry, signatures []

 func (g *AzureSink) UpdateEntry(key string, oldEntry *filer_pb.Entry, newParentPath string, newEntry *filer_pb.Entry, deleteIncludeChunks bool, signatures []int32) (foundExistingEntry bool, err error) {
 	key = cleanKey(key)
-	// TODO improve efficiency
-	return false, nil
+	return true, g.CreateEntry(key, newEntry, signatures)
 }

 func cleanKey(key string) string {
@@ -118,11 +118,8 @@ func (g *B2Sink) CreateEntry(key string, entry *filer_pb.Entry, signatures []int
 }

 func (g *B2Sink) UpdateEntry(key string, oldEntry *filer_pb.Entry, newParentPath string, newEntry *filer_pb.Entry, deleteIncludeChunks bool, signatures []int32) (foundExistingEntry bool, err error) {
-
 	key = cleanKey(key)
-
-	// TODO improve efficiency
-	return false, nil
+	return true, g.CreateEntry(key, newEntry, signatures)
 }

 func cleanKey(key string) string {
@@ -71,29 +71,30 @@ func (fs *FilerSink) fetchAndWrite(sourceChunk *filer_pb.FileChunk, path string)
 	var auth security.EncodedJwt

 	if err := fs.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
+		return util.Retry("assignVolume", func() error {
+			request := &filer_pb.AssignVolumeRequest{
+				Count:       1,
+				Replication: fs.replication,
+				Collection:  fs.collection,
+				TtlSec:      fs.ttlSec,
+				DataCenter:  fs.dataCenter,
+				DiskType:    fs.diskType,
+				Path:        path,
+			}

-		request := &filer_pb.AssignVolumeRequest{
-			Count:       1,
-			Replication: fs.replication,
-			Collection:  fs.collection,
-			TtlSec:      fs.ttlSec,
-			DataCenter:  fs.dataCenter,
-			DiskType:    fs.diskType,
-			Path:        path,
-		}
+			resp, err := client.AssignVolume(context.Background(), request)
+			if err != nil {
+				glog.V(0).Infof("assign volume failure %v: %v", request, err)
+				return err
+			}
+			if resp.Error != "" {
+				return fmt.Errorf("assign volume failure %v: %v", request, resp.Error)
+			}

-		resp, err := client.AssignVolume(context.Background(), request)
-		if err != nil {
-			glog.V(0).Infof("assign volume failure %v: %v", request, err)
-			return err
-		}
-		if resp.Error != "" {
-			return fmt.Errorf("assign volume failure %v: %v", request, resp.Error)
-		}
+			fileId, host, auth = resp.FileId, resp.Url, security.EncodedJwt(resp.Auth)

-		fileId, host, auth = resp.FileId, resp.Url, security.EncodedJwt(resp.Auth)
-
-		return nil
+			return nil
+		})
 	}); err != nil {
 		return "", fmt.Errorf("filerGrpcAddress assign volume: %v", err)
 	}
@@ -116,6 +116,5 @@ func (g *GcsSink) CreateEntry(key string, entry *filer_pb.Entry, signatures []in
 }

 func (g *GcsSink) UpdateEntry(key string, oldEntry *filer_pb.Entry, newParentPath string, newEntry *filer_pb.Entry, deleteIncludeChunks bool, signatures []int32) (foundExistingEntry bool, err error) {
-	// TODO improve efficiency
-	return false, nil
+	return true, g.CreateEntry(key, newEntry, signatures)
 }
--- a/Show More
+++ b/Show More