Repository: juicedata/juicefs
Pull request #2166 (2022-06-06 04:10:49)

CI:fix list action err
/home/runner/work/_temp/[8](https://github.com/juicedata/juicefs/runs/6742429178?check_suite_focus=true#step:7:9)2064f78-3cbf-4872-a16c-a2c65d02be75.sh: line 1: cd: /tmp/juicefs-sync-test/createfile/: No such file or directory
Error: Process completed with exit code 1.

https://github.com/juicedata/juicefs/runs/6742429178?check_suite_focus=true


Patch:
diff --git a/.github/actions/load/action.yml b/.github/actions/load/action.yml
index 9783e871..8973933c 100644
--- a/.github/actions/load/action.yml
+++ b/.github/actions/load/action.yml
@@ -26,10 +26,17 @@ runs:
         echo meta_url is: $meta_url
         db_name=$(basename $meta_url | awk -F? '{print $1}')
         if [[ "$meta_url" == mysql* ]]; then
-          mysql -uroot -proot -h 127.0.0.1 -e "drop database if exists $db_name; create database $db_name;" 
+          user=$(echo $meta_url |  awk -F/ '{print $3}' | awk -F@ '{print $1}' | awk -F: '{print $1}')
+          password=$(echo $meta_url |  awk -F/ '{print $3}' | awk -F@ '{print $1}' | awk -F: '{print $2}')
+          test -n "$password" && password="-p$password" || password=""
+          host=$(basename $(dirname $meta_url) | awk -F@ '{print $2}'| sed 's/(//g' | sed 's/)//g' | awk -F: '{print $1}')
+          port=$(basename $(dirname $meta_url) | awk -F@ '{print $2}'| sed 's/(//g' | sed 's/)//g' | awk -F: '{print $2}')
+          test -z "$port" && port="3306" 
+          mysql -u$user $password -h $host -P $port -e "drop database if exists $db_name; create database $db_name;" 
         elif [[ "$meta_url" == postgres* ]]; then
           export PGPASSWORD="postgres"
           printf "\set AUTOCOMMIT on\ndrop database if exists $db_name; create database $db_name; " |  psql -U postgres -h localhost
+          printf "\set AUTOCOMMIT on\nALTER DATABASE $db_name SET DEFAULT_TRANSACTION_ISOLATION TO '$isolation_level';" |  psql -U postgres -h localhost
         fi
         echo `date`, start load
         sudo ./juicefs load $meta_url $load_file
diff --git a/.github/workflows/gateway.yml b/.github/workflows/gateway.yml
index ca2e3a80..58b2119a 100644
--- a/.github/workflows/gateway.yml
+++ b/.github/workflows/gateway.yml
@@ -396,6 +396,49 @@ jobs:
         if: ${{ failure() }}
         uses: lhotari/action-upterm@v1    
 
+  upload-big-files-with-tidb-read-committed:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Install TiDB
+        run: |
+          curl --proto '=https' --tlsv1.2 -sSf https://tiup-mirrors.pingcap.com/install.sh | sh
+          source /home/runner/.profile
+          tiup playground 5.4.0 &
+          sleep 120
+          mysql -h127.0.0.1 -P4000 -uroot -e "set global tidb_enable_noop_functions=1;"
+      - name: Test
+        uses: ./.github/actions/gateway
+        with:
+          meta_url: "mysql://root:@\\(127.0.0.1:4000\\)/test"
+          file_size: "200M"
+          file_count: 10
+          isolation_level: "read committed"
+      - name: Setup upterm session
+        if: ${{ failure() }}
+        uses: lhotari/action-upterm@v1   
+  upload-big-files-with-tidb-repeatable-read:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Install TiDB
+        run: |
+          curl --proto '=https' --tlsv1.2 -sSf https://tiup-mirrors.pingcap.com/install.sh | sh
+          source /home/runner/.profile
+          tiup playground 5.4.0 &
+          sleep 120
+          mysql -h127.0.0.1 -P4000 -uroot -e "set global tidb_enable_noop_functions=1;"
+      - name: Test
+        uses: ./.github/actions/gateway
+        with:
+          meta_url: "mysql://root:@\\(127.0.0.1:4000\\)/test"
+          file_size: "200M"
+          file_count: 10
+          isolation_level: "repeatable read"
+      - name: Setup upterm session
+        if: ${{ failure() }}
+        uses: lhotari/action-upterm@v1   
+
   upload-small-files-with-etcd:
     runs-on: ubuntu-latest
     steps:
diff --git a/.github/workflows/gc.yml b/.github/workflows/gc.yml
index 71665631..99e337b1 100644
--- a/.github/workflows/gc.yml
+++ b/.github/workflows/gc.yml
@@ -59,7 +59,7 @@ jobs:
           juicefs=./juicefs
           $juicefs format $meta $name --trash-days 1
           $juicefs mount -d $meta $mp
-          fio --name=abc --rw=randwrite --refill_buffers --size=4G --bs=256k --directory=$mp
+          fio --name=abc --rw=randwrite --refill_buffers --size=2G --bs=256k --directory=$mp
           redis-cli save
           # don't skip files when gc compact
           export JFS_SKIPPED_TIME=1
diff --git a/.github/workflows/list.yml b/.github/workflows/list.yml
index b4f3d1ac..71d5e6cc 100644
--- a/.github/workflows/list.yml
+++ b/.github/workflows/list.yml
@@ -13,7 +13,7 @@ on:
     paths-ignore:
       - 'docs/**'
   schedule:
-    - cron:  '0 3 * * *'
+    - cron:  '0 20 * * *'
   workflow_dispatch:
 
 jobs:
@@ -51,11 +51,11 @@ jobs:
       - name: Load
         uses: ./.github/actions/load
         with:
-          meta_url: "postgres://postgres:postgres@127.0.0.1:5432/sync_test?sslmode=disable" 
+          meta_url: "postgres://postgres:postgres@127.0.0.1:5432/sync_test?sslmode=disable"
           load_file: "META_7M_EMPTY_FILE.json"
       - name: List
         run: |
-          cd /tmp/juicefs-sync-test/createfile/
+          cd /tmp/juicefs-load-test/createfile/
           ls -lh |wc -l >/tmp/count.log
           cat /tmp/count.log | grep 7000001
           if [ $? != 0 ];then echo "file num is error";exit 1; fi
@@ -93,11 +93,11 @@ jobs:
       - name: Load
         uses: ./.github/actions/load
         with:
-          meta_url: "mysql://root:root@\\(127.0.0.1\\)/sync_test" 
+          meta_url: "mysql://root:root@\\(127.0.0.1\\)/sync_test"
           load_file: "META_7M_EMPTY_FILE.json"
       - name: List
         run: |
-          cd /tmp/juicefs-sync-test/createfile/
+          cd /tmp/juicefs-load-test/createfile/
           ls -lh |wc -l >/tmp/count.log
           cat /tmp/count.log | grep 7000001
           if [ $? != 0 ];then echo "file num is error";exit 1; fi
@@ -111,6 +111,7 @@ jobs:
         if: ${{ failure() }}
         uses: lhotari/action-upterm@v1
 
+
   redis-list:
     runs-on: ubuntu-latest
     services:
@@ -146,11 +147,11 @@ jobs:
       - name: Load
         uses: ./.github/actions/load
         with:
-          meta_url: redis://127.0.0.1:6379/1 
+          meta_url: redis://127.0.0.1:6379/1
           load_file: "META_7M_EMPTY_FILE.json"
       - name: List
         run: |
-          cd /tmp/juicefs-sync-test/createfile/
+          cd /tmp/juicefs-load-test/createfile/
           ls -lh |wc -l >/tmp/count.log
           cat /tmp/count.log | grep 7000001
           if [ $? != 0 ];then echo "file num is error";exit 1; fi
@@ -166,7 +167,7 @@ jobs:
 
 
   sqlite3-list:
-    runs-on: ubuntu-latest   
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
       - name: Checkout
@@ -191,7 +192,7 @@ jobs:
           load_file: "META_7M_EMPTY_FILE.json"
       - name: List
         run: |
-          cd /tmp/juicefs-sync-test/createfile/
+          cd /tmp/juicefs-load-test/createfile/
           ls -lh |wc -l >/tmp/count.log
           cat /tmp/count.log | grep 7000001
           if [ $? != 0 ];then echo "file num is error";exit 1; fi
diff --git a/.github/workflows/load.yml b/.github/workflows/load.yml
index fd6a3599..c0b208a0 100644
--- a/.github/workflows/load.yml
+++ b/.github/workflows/load.yml
@@ -164,6 +164,30 @@ jobs:
         with:
           meta_url: "mysql://root:root@\\(127.0.0.1\\)/load_test"
           load_file: "meta_with_4M_Empty_files.json"   
+      - name: Setup upterm session
+        if: ${{ failure() }}
+        uses: lhotari/action-upterm@v1
+
+  load-to-tidb:
+    runs-on: ubuntu-latest          
+    steps:
+      - uses: actions/checkout@v3
+      - name: download data
+        run: |
+          wget -q https://s.juicefs.com/static/meta_with_4M_Empty_files.json.gz
+          gzip -dk  meta_with_4M_Empty_files.json.gz
+      - name: install 
+        run: | 
+          curl --proto '=https' --tlsv1.2 -sSf https://tiup-mirrors.pingcap.com/install.sh | sh
+          source /home/runner/.profile
+          tiup playground 5.4.0 &
+          sleep 120
+          mysql -h127.0.0.1 -P4000 -uroot -e "set global tidb_enable_noop_functions=1;"
+      - name: Test
+        uses: ./.github/actions/load
+        with:
+          meta_url: "mysql://root:@\\(127.0.0.1:4000\\)/load_test"
+          load_file: "meta_with_4M_Empty_files.json"   
       - name: Setup upterm session
         if: ${{ failure() }}
         uses: lhotari/action-upterm@v1
\ No newline at end of file
diff --git a/.github/workflows/rmdirectory.yml b/.github/workflows/rmdirectory.yml
index a6720803..c796d071 100644
--- a/.github/workflows/rmdirectory.yml
+++ b/.github/workflows/rmdirectory.yml
@@ -55,7 +55,7 @@ jobs:
           load_file: "META_4M_EMPTY_FILE_RM.json"
       - name: Rm 400w Files in a Directory of 400 Children Directory
         run: |
-          cd /tmp/juicefs-sync-test/
+          cd /tmp/juicefs-load-test/
           sudo chmod 777 mkdir
           echo "rm 400w files in a directory of 400 children directory"
           git clone https://github.com/juicedata/juicefs.git
@@ -106,7 +106,7 @@ jobs:
           load_file: "META_4M_EMPTY_FILE_RM.json"
       - name: Rm 400w Files in a Directory of 400 Children Directory
         run: |
-          cd /tmp/juicefs-sync-test/
+          cd /tmp/juicefs-load-test/
           sudo chmod 777 mkdir
           echo "rm 400w files in a directory of 400 children directory"
           git clone https://github.com/juicedata/juicefs.git
@@ -169,7 +169,7 @@ jobs:
           load_file: "META_4M_EMPTY_FILE_RM.json"
       - name: Rm 400w Files in a Directory of 400 Children Directory
         run: |
-          cd /tmp/juicefs-sync-test/
+          cd /tmp/juicefs-load-test/
           sudo chmod 777 mkdir
           echo "rm 400w files in a directory of 400 children directory"
           git clone https://github.com/juicedata/juicefs.git
@@ -218,7 +218,7 @@ jobs:
           load_file: "META_4M_EMPTY_FILE_RM.json"
       - name: Rm 400w Files in a Directory of 400 Children Directory
         run: |
-          cd /tmp/juicefs-sync-test/
+          cd /tmp/juicefs-load-test/
           sudo chmod 777 mkdir
           echo "rm 400w files in a directory of 400 children directory"
           git clone https://github.com/juicedata/juicefs.git
diff --git a/.github/workflows/rmfiles.yml b/.github/workflows/rmfiles.yml
index 576b7688..112832b7 100644
--- a/.github/workflows/rmfiles.yml
+++ b/.github/workflows/rmfiles.yml
@@ -55,7 +55,7 @@ jobs:
           load_file: "META_4M_EMPTY_FILE_RM.json"
       - name: Rm 100w Files in Depth of 1 Directory
         run: |
-          cd /tmp/juicefs-sync-test/mkdir/
+          cd /tmp/juicefs-load-test/mkdir/
           sudo chmod 777 ../mkdir
           echo "rm 100w files in depth of 1 directory"
           git clone https://github.com/juicedata/juicefs.git
@@ -64,13 +64,13 @@ jobs:
           sudo ./juicefs rmr ../aaa/
       - name: Rm 100w Files in Depth of 10 Directory
         run: |
-          cd /tmp/juicefs-sync-test/mkdir/
+          cd /tmp/juicefs-load-test/mkdir/
           echo "rm 100w files in depth of 10 directory"
           cd juicefs
           sudo ./juicefs rmr ../aaa0/
       - name: Rm 200w Files in Depth of 20 Directory
         run: |
-          cd /tmp/juicefs-sync-test/mkdir/
+          cd /tmp/juicefs-load-test/mkdir/
           echo "rm 200w files in depth of 20 directory"
           cd juicefs
           sudo ./juicefs rmr ../aaa2/
@@ -116,7 +116,7 @@ jobs:
           load_file: "META_4M_EMPTY_FILE_RM.json"
       - name: Rm 100w Files in Depth of 1 Directory
         run: |
-          cd /tmp/juicefs-sync-test/mkdir/
+          cd /tmp/juicefs-load-test/mkdir/
           sudo chmod 777 ../mkdir
           echo "rm 100w files in depth of 1 directory"
           git clone https://github.com/juicedata/juicefs.git
@@ -125,13 +125,13 @@ jobs:
           sudo ./juicefs rmr ../aaa/
       - name: Rm 100w Files in Depth of 10 Directory
         run: |
-          cd /tmp/juicefs-sync-test/mkdir/
+          cd /tmp/juicefs-load-test/mkdir/
           echo "rm 100w files in depth of 10 directory"
           cd juicefs
           sudo ./juicefs rmr ../aaa0/
       - name: Rm 200w Files in Depth of 20 Directory
         run: |
-          cd /tmp/juicefs-sync-test/mkdir/
+          cd /tmp/juicefs-load-test/mkdir/
           echo "rm 200w files in depth of 20 directory"
           cd juicefs
           sudo ./juicefs rmr ../aaa2/
@@ -189,7 +189,7 @@ jobs:
           load_file: "META_4M_EMPTY_FILE_RM.json"
       - name: Rm 100w Files in Depth of 1 Directory
         run: |
-          cd /tmp/juicefs-sync-test/mkdir/
+          cd /tmp/juicefs-load-test/mkdir/
           sudo chmod 777 ../mkdir
           echo "rm 100w files in depth of 1 directory"
           git clone https://github.com/juicedata/juicefs.git
@@ -198,13 +198,13 @@ jobs:
           sudo ./juicefs rmr ../aaa/
       - name: Rm 100w Files in Depth of 10 Directory
         run: |
-          cd /tmp/juicefs-sync-test/mkdir/
+          cd /tmp/juicefs-load-test/mkdir/
           echo "rm 100w files in depth of 10 directory"
           cd juicefs
           sudo ./juicefs rmr ../aaa0/
       - name: Rm 200w Files in Depth of 20 Directory
         run: |
-          cd /tmp/juicefs-sync-test/mkdir/
+          cd /tmp/juicefs-load-test/mkdir/
           echo "rm 200w files in depth of 20 directory"
           cd juicefs
           sudo ./juicefs rmr ../aaa2/
@@ -249,7 +249,7 @@ jobs:
           load_file: "META_4M_EMPTY_FILE_RM.json"
       - name: Rm 100w Files in Depth of 1 Directory
         run: |
-          cd /tmp/juicefs-sync-test/mkdir/
+          cd /tmp/juicefs-load-test/mkdir/
           sudo chmod 777 ../mkdir
           echo "rm 100w files in depth of 1 directory"
           git clone https://github.com/juicedata/juicefs.git
@@ -258,13 +258,13 @@ jobs:
           sudo ./juicefs rmr ../aaa/
       - name: Rm 100w Files in Depth of 10 Directory
         run: |
-          cd /tmp/juicefs-sync-test/mkdir/
+          cd /tmp/juicefs-load-test/mkdir/
           echo "rm 100w files in depth of 10 directory"
           cd juicefs
           sudo ./juicefs rmr ../aaa0/
       - name: Rm 200w Files in Depth of 20 Directory
         run: |
-          cd /tmp/juicefs-sync-test/mkdir/
+          cd /tmp/juicefs-load-test/mkdir/
           echo "rm 200w files in depth of 20 directory"
           cd juicefs
           sudo ./juicefs rmr ../aaa2/
diff --git a/.github/workflows/sync.yml b/.github/workflows/sync.yml
index f6cf1b1d..24f0ccd6 100644
--- a/.github/workflows/sync.yml
+++ b/.github/workflows/sync.yml
@@ -17,7 +17,7 @@ on:
   workflow_dispatch:
 
 jobs:
-  sync-test:
+  compare-with-rsync:
     runs-on: ubuntu-latest
     services:
       redis:
@@ -33,11 +33,6 @@ jobs:
           # Maps port 6379 on service container to the host
           - 6379:6379
     steps:
-      - name: Set up Go
-        uses: actions/setup-go@v2
-        with:
-          go-version: '1.17.x'
-
       - name: Checkout
         uses: actions/checkout@v2
         with:
@@ -46,12 +41,6 @@ jobs:
       - name: Build linux target
         run: make juicefs
 
-      - name: Checkout source code for sync test
-        uses: actions/checkout@v2
-        with:
-          repository: juicedata/juicefs
-          path: juicefs-source
-
       - name: Checkout source code for test
         uses: actions/checkout@v2
         with:
@@ -99,6 +88,51 @@ jobs:
           channel-id: "${{ secrets.SLACK_CHANNEL_ID_FOR_PR_CHECK_NOTIFY }}"
           slack_bot_token: "${{ secrets.SLACK_BOT_TOKEN }}"  
 
+      - name: Setup upterm session
+        if: ${{ failure() }}
+        uses: lhotari/action-upterm@v1
+
+  file-head-test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 1
+
+      - name: Build linux target
+        run: |
+          make juicefs
+          # wget -q https://github.com/juicedata/juicefs/releases/download/v1.0.0-beta3/juicefs-1.0.0-beta3-linux-amd64.tar.gz
+          # tar -zxf juicefs-1.0.0-beta3-linux-amd64.tar.gz
+
+      - name: Checkout source code for test
+        uses: actions/checkout@v2
+        with:
+          repository: juicedata/juicefs
+          path: jfs_source
+
+      - name: Test
+        run: |
+          # issue link: https://github.com/juicedata/juicefs/issues/2125
+          meta_url=sqlite3://test.db
+          mount_point=/tmp/sync-test/
+          ./juicefs format --trash-days 0 $meta_url sync-test
+          ./juicefs mount --no-usage-report $meta_url $mount_point -d
+          mkdir $mount_point/jfs_source/
+          ./juicefs sync jfs_source/ $mount_point/jfs_source/  -u=true --perms=true --check-all=true --bwlimit=81920 --dirs=true --threads=30 --debug  
+          echo "test" > jfs_source/test_file
+          mkdir jfs_source/test_dir
+          ./juicefs sync jfs_source/ $mount_point/jfs_source/  -u=true --perms=true --check-all=true --bwlimit=81920 --dirs=true --threads=30 --debug  
+          diff -ur jfs_source/ $mount_point/jfs_source
+
+      - name: Send Slack Notification
+        if: ${{ failure() }}
+        uses: juicedata/slack-notify-action@main
+        with:
+          channel-id: "${{ secrets.SLACK_CHANNEL_ID_FOR_PR_CHECK_NOTIFY }}"
+          slack_bot_token: "${{ secrets.SLACK_BOT_TOKEN }}"  
+
       - name: Setup upterm session
         if: ${{ failure() }}
         uses: lhotari/action-upterm@v1
\ No newline at end of file
diff --git a/.github/workflows/tpch_clickhouse.yml b/.github/workflows/tpch_clickhouse.yml
index 62b20cc2..367c1aeb 100644
--- a/.github/workflows/tpch_clickhouse.yml
+++ b/.github/workflows/tpch_clickhouse.yml
@@ -152,7 +152,6 @@ jobs:
           clickhouse-client --query "INSERT INTO part FORMAT CSV" < part.tbl
           clickhouse-client --query "INSERT INTO supplier FORMAT CSV" < supplier.tbl
           time clickhouse-client --query "INSERT INTO lineorder FORMAT CSV" < lineorder.tbl
-          sudo du -sh /data/jfs/
           df -lh
 
 
@@ -255,7 +254,6 @@ jobs:
                                      ORDER BY
                                          year ASC,
                                          C_NATION ASC;"
-          sudo du -sh /data/jfs/
           df -lh
 
 
diff --git a/.github/workflows/tpch_clickhouse_limitcache.yml b/.github/workflows/tpch_clickhouse_limitcache.yml
index 4212b4e5..54bc26ff 100644
--- a/.github/workflows/tpch_clickhouse_limitcache.yml
+++ b/.github/workflows/tpch_clickhouse_limitcache.yml
@@ -13,7 +13,7 @@ on:
     paths-ignore:
       - 'docs/**'
   schedule:
-    - cron:  '30 * * * *'
+    - cron:  '30 20 * * *'
 
   workflow_dispatch:
 
@@ -152,7 +152,6 @@ jobs:
           clickhouse-client --query "INSERT INTO part FORMAT CSV" < part.tbl
           clickhouse-client --query "INSERT INTO supplier FORMAT CSV" < supplier.tbl
           time clickhouse-client --query "INSERT INTO lineorder FORMAT CSV" < lineorder.tbl
-          sudo du -sh /data/jfs/
           df -lh
 
       - name: ClickHouse Test
@@ -254,7 +253,6 @@ jobs:
                                      ORDER BY
                                          year ASC,
                                          C_NATION ASC;"
-          sudo du -sh /data/jfs/
           df -lh
 
 
diff --git a/.github/workflows/tpch_clickhouse_mode_local.yml b/.github/workflows/tpch_clickhouse_mode_local.yml
deleted file mode 100644
index f92178c4..00000000
--- a/.github/workflows/tpch_clickhouse_mode_local.yml
+++ /dev/null
@@ -1,266 +0,0 @@
-name: "tpch_clickhouse_mode_local"
-
-on:
-  push:
-    branches:
-      - 'release-**'
-    paths-ignore:
-      - 'docs/**'
-  pull_request:
-    #The branches below must be a subset of the branches above
-    branches:
-      - 'release-**'
-    paths-ignore:
-      - 'docs/**'
-  schedule:
-    - cron:  '30 * * * *'
-
-  workflow_dispatch:
-
-jobs:
-  tpchchmode_local:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Set up Go
-        uses: actions/setup-go@v2
-        with:
-          go-version: '1.17.x'
-
-      - name: Set up Docker
-        uses: docker-practice/actions-setup-docker@master
-
-      - name: Checkout
-        uses: actions/checkout@v2
-        with:
-          fetch-depth: 1
-
-      - name: Build linux target
-        run: make juicefs
-
-      - name: Run Redis
-        run: |
-          sudo docker run -d --name redis -v redis-data:/data  \
-          -p 6379:6379  redis redis-server --appendonly yes
-
-      - name: Juicefs Format
-        run: |
-          sudo ./juicefs format redis://127.0.0.1:6379/1 pics
-
-
-      - name: Juicefs Mount
-        run: |
-          sudo ./juicefs mount -d redis://127.0.0.1:6379/1 /data/jfs --no-usage-report &
-
-
-      - name: Install ClickHouse
-        run: |
-          sudo apt-get install -y apt-transport-https ca-certificates dirmngr
-          echo "deb https://packages.clickhouse.com/deb stable main" | sudo tee /etc/apt/sources.list.d/clickhouse.list
-          sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 8919F6BD2B48D754
-          sudo apt-get update
-          sudo DEBIAN_FRONTEND=noninteractive  apt-get install -y  clickhouse-server clickhouse-client
-
-
-      - name: Change Datadir
-        run: |
-          sudo chmod 777 /etc/clickhouse-server/
-          sudo chmod 777 /etc/clickhouse-server/config.xml
-          sudo sed -i "s?<path>/var/lib/clickhouse/</path>?<path>/data/jfs/</path>?" /etc/clickhouse-server/config.xml
-          sudo service clickhouse-server start
-          sudo service clickhouse-server status
-          ls -lah /data/jfs/
-
-
-      - name: Generate Data
-        run: |
-          cd /home/runner/work/
-          git clone https://github.com/sanwan/actiondata.git
-          cd actiondata
-          cat lineorder.tbl.gz* >lineorder.tbl.gz
-          gzip -dk lineorder.tbl.gz
-          git clone https://github.com/sanwan/actionfile.git
-          mv actionfile/*.tbl .
-          rm lineorder.tbl.gz*
-          ls -lrth
-          sudo du -sh /home/runner/work/actiondata/
-          df -lh
-
-
-      - name: Create Table
-        run: |
-          clickhouse-client --query "CREATE TABLE customer
-                                     (
-                                             C_CUSTKEY       UInt32,
-                                             C_NAME          String,
-                                             C_ADDRESS       String,
-                                             C_CITY          LowCardinality(String),
-                                             C_NATION        LowCardinality(String),
-                                             C_REGION        LowCardinality(String),
-                                             C_PHONE         String,
-                                             C_MKTSEGMENT    LowCardinality(String)
-                                     )
-                                     ENGINE = MergeTree ORDER BY (C_CUSTKEY);"
-          clickhouse-client --query "CREATE TABLE lineorder
-                                     (
-                                         LO_ORDERKEY             UInt32,
-                                         LO_LINENUMBER           UInt8,
-                                         LO_CUSTKEY              UInt32,
-                                         LO_PARTKEY              UInt32,
-                                         LO_SUPPKEY              UInt32,
-                                         LO_ORDERDATE            Date,
-                                         LO_ORDERPRIORITY        LowCardinality(String),
-                                         LO_SHIPPRIORITY         UInt8,
-                                         LO_QUANTITY             UInt8,
-                                         LO_EXTENDEDPRICE        UInt32,
-                                         LO_ORDTOTALPRICE        UInt32,
-                                         LO_DISCOUNT             UInt8,
-                                         LO_REVENUE              UInt32,
-                                         LO_SUPPLYCOST           UInt32,
-                                         LO_TAX                  UInt8,
-                                         LO_COMMITDATE           Date,
-                                         LO_SHIPMODE             LowCardinality(String)
-                                     )
-                                     ENGINE = MergeTree PARTITION BY toYear(LO_ORDERDATE) ORDER BY (LO_ORDERDATE, LO_ORDERKEY);"
-          clickhouse-client --query "CREATE TABLE part
-                                     (
-                                             P_PARTKEY       UInt32,
-                                             P_NAME          String,
-                                             P_MFGR          LowCardinality(String),
-                                             P_CATEGORY      LowCardinality(String),
-                                             P_BRAND         LowCardinality(String),
-                                             P_COLOR         LowCardinality(String),
-                                             P_TYPE          LowCardinality(String),
-                                             P_SIZE          UInt8,
-                                             P_CONTAINER     LowCardinality(String)
-                                     )
-                                     ENGINE = MergeTree ORDER BY P_PARTKEY;"
-          clickhouse-client --query "CREATE TABLE supplier
-                                     (
-                                             S_SUPPKEY       UInt32,
-                                             S_NAME          String,
-                                             S_ADDRESS       String,
-                                             S_CITY          LowCardinality(String),
-                                             S_NATION        LowCardinality(String),
-                                             S_REGION        LowCardinality(String),
-                                             S_PHONE         String
-                                     )
-                                     ENGINE = MergeTree ORDER BY S_SUPPKEY;"
-      - name: Import Data
-        run: |
-          cd /home/runner/work/actiondata/
-          clickhouse-client --query "INSERT INTO customer FORMAT CSV" < customer.tbl
-          clickhouse-client --query "INSERT INTO part FORMAT CSV" < part.tbl
-          clickhouse-client --query "INSERT INTO supplier FORMAT CSV" < supplier.tbl
-          time clickhouse-client --query "INSERT INTO lineorder FORMAT CSV" < lineorder.tbl
-
-      - name: ClickHouse Test
-        run: |
-          clickhouse-client --query "SET max_memory_usage = 20000000000;"
-          time clickhouse-client --query "CREATE TABLE lineorder_flat
-                                     ENGINE = MergeTree
-                                     PARTITION BY toYear(LO_ORDERDATE)
-                                     ORDER BY (LO_ORDERDATE, LO_ORDERKEY) AS
-                                     SELECT
-                                         l.LO_ORDERKEY AS LO_ORDERKEY,
-                                         l.LO_LINENUMBER AS LO_LINENUMBER,
-                                         l.LO_CUSTKEY AS LO_CUSTKEY,
-                                         l.LO_PARTKEY AS LO_PARTKEY,
-                                         l.LO_SUPPKEY AS LO_SUPPKEY,
-                                         l.LO_ORDERDATE AS LO_ORDERDATE,
-                                         l.LO_ORDERPRIORITY AS LO_ORDERPRIORITY,
-                                         l.LO_SHIPPRIORITY AS LO_SHIPPRIORITY,
-                                         l.LO_QUANTITY AS LO_QUANTITY,
-                                         l.LO_EXTENDEDPRICE AS LO_EXTENDEDPRICE,
-                                         l.LO_ORDTOTALPRICE AS LO_ORDTOTALPRICE,
-                                         l.LO_DISCOUNT AS LO_DISCOUNT,
-                                         l.LO_REVENUE AS LO_REVENUE,
-                                         l.LO_SUPPLYCOST AS LO_SUPPLYCOST,
-                                         l.LO_TAX AS LO_TAX,
-                                         l.LO_COMMITDATE AS LO_COMMITDATE,
-                                         l.LO_SHIPMODE AS LO_SHIPMODE,
-                                         c.C_NAME AS C_NAME,
-                                         c.C_ADDRESS AS C_ADDRESS,
-                                         c.C_CITY AS C_CITY,
-                                         c.C_NATION AS C_NATION,
-                                         c.C_REGION AS C_REGION,
-                                         c.C_PHONE AS C_PHONE,
-                                         c.C_MKTSEGMENT AS C_MKTSEGMENT,
-                                         s.S_NAME AS S_NAME,
-                                         s.S_ADDRESS AS S_ADDRESS,
-                                         s.S_CITY AS S_CITY,
-                                         s.S_NATION AS S_NATION,
-                                         s.S_REGION AS S_REGION,
-                                         s.S_PHONE AS S_PHONE,
-                                         p.P_NAME AS P_NAME,
-                                         p.P_MFGR AS P_MFGR,
-                                         p.P_CATEGORY AS P_CATEGORY,
-                                         p.P_BRAND AS P_BRAND,
-                                         p.P_COLOR AS P_COLOR,
-                                         p.P_TYPE AS P_TYPE,
-                                         p.P_SIZE AS P_SIZE,
-                                         p.P_CONTAINER AS P_CONTAINER
-                                     FROM lineorder AS l
-                                     INNER JOIN customer AS c ON c.C_CUSTKEY = l.LO_CUSTKEY
-                                     INNER JOIN supplier AS s ON s.S_SUPPKEY = l.LO_SUPPKEY
-                                     INNER JOIN part AS p ON p.P_PARTKEY = l.LO_PARTKEY;"
-          echo "Q1.1"
-          time clickhouse-client --query "SELECT sum(LO_EXTENDEDPRICE * LO_DISCOUNT) AS revenue
-                                     FROM lineorder_flat
-                                     WHERE toYear(LO_ORDERDATE) = 1993 AND LO_DISCOUNT BETWEEN 1 AND 3 AND LO_QUANTITY < 25;"
-          echo "Q1.2"
-          time clickhouse-client --query "SELECT sum(LO_EXTENDEDPRICE * LO_DISCOUNT) AS revenue
-                                     FROM lineorder_flat
-                                     WHERE toYYYYMM(LO_ORDERDATE) = 199401 AND LO_DISCOUNT BETWEEN 4 AND 6 AND LO_QUANTITY BETWEEN 26 AND 35;"
-          echo "Q2.1"
-          time clickhouse-client --query "SELECT
-                                         sum(LO_REVENUE),
-                                         toYear(LO_ORDERDATE) AS year,
-                                         P_BRAND
-                                     FROM lineorder_flat
-                                     WHERE P_CATEGORY = 'MFGR#12' AND S_REGION = 'AMERICA'
-                                     GROUP BY
-                                         year,
-                                         P_BRAND
-                                     ORDER BY
-                                         year,
-                                         P_BRAND;"
-          echo "Q3.1"
-          time clickhouse-client --query "SELECT
-                                         C_NATION,
-                                         S_NATION,
-                                         toYear(LO_ORDERDATE) AS year,
-                                         sum(LO_REVENUE) AS revenue
-                                     FROM lineorder_flat
-                                     WHERE C_REGION = 'ASIA' AND S_REGION = 'ASIA' AND year >= 1992 AND year <= 1997
-                                     GROUP BY
-                                         C_NATION,
-                                         S_NATION,
-                                         year
-                                     ORDER BY
-                                         year ASC,
-                                         revenue DESC;"
-          echo "Q4.1"
-          time clickhouse-client --query "SELECT
-                                         toYear(LO_ORDERDATE) AS year,
-                                         C_NATION,
-                                         sum(LO_REVENUE - LO_SUPPLYCOST) AS profit
-                                     FROM lineorder_flat
-                                     WHERE C_REGION = 'AMERICA' AND S_REGION = 'AMERICA' AND (P_MFGR = 'MFGR#1' OR P_MFGR = 'MFGR#2')
-                                     GROUP BY
-                                         year,
-                                         C_NATION
-                                     ORDER BY
-                                         year ASC,
-                                         C_NATION ASC;"
-          df -lh
-
-      - name: Send Slack Notification
-        if: ${{ failure() }}
-        uses: juicedata/slack-notify-action@main
-        with:
-          channel-id: "${{ secrets.SLACK_CHANNEL_ID_FOR_PR_CHECK_NOTIFY }}"
-          slack_bot_token: "${{ secrets.SLACK_BOT_TOKEN }}"
-
-      - name: Setup upterm session
-        if: ${{ failure() }}
-        uses: lhotari/action-upterm@v1
\ No newline at end of file
diff --git a/cmd/format.go b/cmd/format.go
index 64b5277e..89dad921 100644
--- a/cmd/format.go
+++ b/cmd/format.go
@@ -173,8 +173,10 @@ func fixObjectSize(s int) int {
 	}
 	s = s << bits
 	if s < min {
+		logger.Warnf("block size is too small: %d, use %d instead", s, min)
 		s = min
 	} else if s > max {
+		logger.Warnf("block size is too large: %d, use %d instead", s, max)
 		s = max
 	}
 	return s
@@ -319,7 +321,9 @@ func format(c *cli.Context) error {
 	if v := c.Int("trash-days"); v < 0 {
 		logger.Fatalf("Invalid trash days: %d", v)
 	}
-
+	if v := c.Int("shards"); v > 256 {
+		logger.Fatalf("too many shards: %d", v)
+	}
 	loadEncrypt := func(keyPath string) string {
 		if keyPath == "" {
 			return ""
@@ -397,12 +401,16 @@ func format(c *cli.Context) error {
 	} else {
 		logger.Fatalf("Load metadata: %s", err)
 	}
-	if format.Storage == "file" {
-		if p, err := filepath.Abs(format.Bucket); err == nil {
-			format.Bucket = p + "/"
+	if format.Storage == "file" || format.Storage == "sqlite3" {
+		p, err := filepath.Abs(format.Bucket)
+		if err == nil {
+			format.Bucket = p
 		} else {
 			logger.Fatalf("Failed to get absolute path of %s: %s", format.Bucket, err)
 		}
+		if format.Storage == "file" {
+			format.Bucket += "/"
+		}
 	}
 
 	blob, err := createStorage(*format)
diff --git a/cmd/fsck.go b/cmd/fsck.go
index 1bd7daf4..151e323c 100644
--- a/cmd/fsck.go
+++ b/cmd/fsck.go
@@ -131,11 +131,10 @@ func fsck(ctx *cli.Context) error {
 				if _, ok := blocks[key]; !ok {
 					if _, err := blob.Head(key); err != nil {
 						if _, ok := brokens[inode]; !ok {
-							if p, st := meta.GetPath(m, meta.Background, inode); st == 0 {
-								brokens[inode] = p
+							if ps := meta.GetPaths(m, meta.Background, inode); len(ps) > 0 {
+								brokens[inode] = ps[0]
 							} else {
-								logger.Warnf("getpath of inode %d: %s", inode, st)
-								brokens[inode] = st.Error()
+								brokens[inode] = fmt.Sprintf("inode:%d", inode)
 							}
 						}
 						logger.Errorf("can't find block %s for file %s: %s", key, brokens[inode], err)
diff --git a/cmd/gc.go b/cmd/gc.go
index c120df66..39624641 100644
--- a/cmd/gc.go
+++ b/cmd/gc.go
@@ -145,6 +145,10 @@ func gc(ctx *cli.Context) error {
 
 	// Delete pending chunks while listing slices
 	delete := ctx.Bool("delete")
+	threads := ctx.Int("threads")
+	if delete && threads <= 0 {
+		logger.Fatal("threads should be greater than 0 to delete objects")
+	}
 	var delSpin *utils.Bar
 	var chunkChan chan *dChunk // pending delete chunks
 	var wg sync.WaitGroup
@@ -156,7 +160,7 @@ func gc(ctx *cli.Context) error {
 			chunkChan <- &dChunk{args[0].(uint64), args[1].(uint32)}
 			return nil
 		})
-		for i := 0; i < ctx.Int("threads"); i++ {
+		for i := 0; i < threads; i++ {
 			wg.Add(1)
 			go func() {
 				defer wg.Done()
@@ -222,7 +226,7 @@ func gc(ctx *cli.Context) error {
 	}
 
 	var leakedObj = make(chan string, 10240)
-	for i := 0; i < ctx.Int("threads"); i++ {
+	for i := 0; i < threads; i++ {
 		wg.Add(1)
 		go func() {
 			defer wg.Done()
diff --git a/cmd/load.go b/cmd/load.go
index 55434be9..24af9d3c 100644
--- a/cmd/load.go
+++ b/cmd/load.go
@@ -17,10 +17,12 @@
 package cmd
 
 import (
+	"fmt"
 	"io"
 	"os"
 
 	"github.com/juicedata/juicefs/pkg/meta"
+	"github.com/juicedata/juicefs/pkg/utils"
 	"github.com/urfave/cli/v2"
 )
 
@@ -59,6 +61,9 @@ func load(ctx *cli.Context) error {
 		defer fp.Close()
 	}
 	m := meta.NewClient(ctx.Args().Get(0), &meta.Config{Retries: 10, Strict: true})
+	if format, err := m.Load(false); err == nil {
+		return fmt.Errorf("Database %s is used by volume %s", utils.RemovePassword(ctx.Args().Get(0)), format.Name)
+	}
 	if err := m.LoadMeta(fp); err != nil {
 		return err
 	}
diff --git a/cmd/main.go b/cmd/main.go
index a803234e..f31cfe8b 100644
--- a/cmd/main.go
+++ b/cmd/main.go
@@ -205,7 +205,7 @@ func reorderOptions(app *cli.App, args []string) []string {
 		option := args[i]
 		if ok, hasValue := isFlag(cmdFlags, option); ok {
 			newArgs = append(newArgs, option)
-			if hasValue {
+			if hasValue && len(args[i+1:]) > 0 {
 				i++
 				newArgs = append(newArgs, args[i])
 			}
diff --git a/cmd/mount.go b/cmd/mount.go
index b0d0be76..c8700851 100644
--- a/cmd/mount.go
+++ b/cmd/mount.go
@@ -233,13 +233,17 @@ func daemonRun(c *cli.Context, addr string, vfsConf *vfs.Config, m meta.Meta) {
 }
 
 func getVfsConf(c *cli.Context, metaConf *meta.Config, format *meta.Format, chunkConf *chunk.Config) *vfs.Config {
-	return &vfs.Config{
+	cfg := &vfs.Config{
 		Meta:       metaConf,
 		Format:     format,
 		Version:    version.Version(),
 		Chunk:      chunkConf,
 		BackupMeta: duration(c.String("backup-meta")),
 	}
+	if cfg.BackupMeta < time.Minute*5 {
+		logger.Fatalf("backup-meta should not be less than 5 minutes: %s", cfg.BackupMeta)
+	}
+	return cfg
 }
 
 func registerMetaMsg(m meta.Meta, store chunk.ChunkStore, chunkConf *chunk.Config) {
@@ -274,7 +278,7 @@ func prepareMp(mp string) {
 }
 
 func getMetaConf(c *cli.Context, mp string, readOnly bool) *meta.Config {
-	return &meta.Config{
+	cfg := &meta.Config{
 		Retries:    c.Int("io-retries"),
 		Strict:     true,
 		ReadOnly:   readOnly,
@@ -284,6 +288,15 @@ func getMetaConf(c *cli.Context, mp string, readOnly bool) *meta.Config {
 		MountPoint: mp,
 		Subdir:     c.String("subdir"),
 	}
+	if cfg.Heartbeat < time.Second {
+		logger.Warnf("heartbeat should not be less than 1 second")
+		cfg.Heartbeat = time.Second
+	}
+	if cfg.Heartbeat > time.Minute*10 {
+		logger.Warnf("heartbeat shouldd not be greater than 10 minutes")
+		cfg.Heartbeat = time.Minute * 10
+	}
+	return cfg
 }
 
 func getChunkConf(c *cli.Context, format *meta.Format) *chunk.Config {
@@ -311,6 +324,14 @@ func getChunkConf(c *cli.Context, format *meta.Format) *chunk.Config {
 		CacheFullBlock: !c.Bool("cache-partial-only"),
 		AutoCreate:     true,
 	}
+	if chunkConf.MaxUpload <= 0 {
+		logger.Warnf("max-uploads should be greater than 0, set it to 1")
+		chunkConf.MaxUpload = 1
+	}
+	if chunkConf.BufferSize <= 32<<20 {
+		logger.Warnf("buffer-size should be more than 32 MiB")
+		chunkConf.BufferSize = 32 << 20
+	}
 
 	if chunkConf.CacheDir != "memory" {
 		ds := utils.SplitDir(chunkConf.CacheDir)
@@ -407,7 +428,7 @@ func mount(c *cli.Context) error {
 	if c.Bool("background") && os.Getenv("JFS_FOREGROUND") == "" {
 		daemonRun(c, addr, vfsConf, metaCli)
 	} else {
-		go checkMountpoint(vfsConf.Format.Name, mp, c.String("log"))
+		go checkMountpoint(vfsConf.Format.Name, mp, c.String("log"), false)
 	}
 
 	removePassword(addr)
diff --git a/cmd/mount_unix.go b/cmd/mount_unix.go
index 56edcbf6..16de4a57 100644
--- a/cmd/mount_unix.go
+++ b/cmd/mount_unix.go
@@ -36,7 +36,7 @@ import (
 	"github.com/urfave/cli/v2"
 )
 
-func checkMountpoint(name, mp, logPath string) {
+func checkMountpoint(name, mp, logPath string, background bool) {
 	for i := 0; i < 20; i++ {
 		time.Sleep(time.Millisecond * 500)
 		st, err := os.Stat(mp)
@@ -50,7 +50,11 @@ func checkMountpoint(name, mp, logPath string) {
 		_ = os.Stdout.Sync()
 	}
 	_, _ = os.Stdout.WriteString("\n")
-	logger.Fatalf("fail to mount after 10 seconds, please check the log (%s) or re-mount in foreground", logPath)
+	if background {
+		logger.Fatalf("The mount point is not ready in 10 seconds, please check the log (%s) or re-mount in foreground", logPath)
+	} else {
+		logger.Fatalf("The mount point is not ready in 10 seconds, exit it")
+	}
 }
 
 func makeDaemon(c *cli.Context, name, mp string, m meta.Meta) error {
@@ -60,7 +64,7 @@ func makeDaemon(c *cli.Context, name, mp string, m meta.Meta) error {
 		if stage != 0 {
 			return nil
 		}
-		checkMountpoint(name, mp, logfile)
+		checkMountpoint(name, mp, logfile, true)
 		return nil
 	}
 
diff --git a/cmd/mount_windows.go b/cmd/mount_windows.go
index f7fdee43..be319771 100644
--- a/cmd/mount_windows.go
+++ b/cmd/mount_windows.go
@@ -54,5 +54,5 @@ func mount_main(v *vfs.VFS, c *cli.Context) {
 	winfsp.Serve(v, c.String("o"), c.Float64("file-cache-to"), c.Bool("as-root"), c.Int("delay-close"))
 }
 
-func checkMountpoint(name, mp, logPath string) {
+func checkMountpoint(name, mp, logPath string, background bool) {
 }
diff --git a/cmd/warmup.go b/cmd/warmup.go
index 01f437aa..992a6fcb 100644
--- a/cmd/warmup.go
+++ b/cmd/warmup.go
@@ -169,6 +169,10 @@ func warmup(ctx *cli.Context) error {
 	}
 
 	threads := ctx.Uint("threads")
+	if threads == 0 {
+		logger.Warnf("threads should be larger than 0, reset it to 1")
+		threads = 1
+	}
 	background := ctx.Bool("background")
 	start := len(mp)
 	batch := make([]string, 0, batchMax)
diff --git a/docs/en/development/io_processing.md b/docs/en/development/io_processing.md
index a8b553ec..bf5ed6b0 100644
--- a/docs/en/development/io_processing.md
+++ b/docs/en/development/io_processing.md
@@ -3,7 +3,51 @@ sidebar_label: Read/Write/Delete Processing Flow
 sidebar_position: 2
 slug: /internals/io_processing
 ---
-# Read and write request processing flow
+# An introduction to the workflow of processing read and write
 
-Working in progress...
+## Workflow of processing write
 
+JuiceFS splits large files at multiple levels to improve I/O performance. See [how JuiceFS store files](../reference/how_juicefs_store_files.md). When processing write requests, JuiceFS first writes data into the client buffer and stores in chunks and slices. Chunks are successive logical units, which are split in a size of 64 MiB based on file offset. Chunks are isolated from each other and will be further split into slices if necessary. A new slice will be created if it doesn't overlap nor adjoin any existing slices; otherwise,  the affected existing slices will be updated. Slices are logical units for data persistency. When doing a flush, a slice will be first split into 4 MiB blocks and then uploaded to object storage, and eventually the metadata of the slice will be updated. As there is a one-to-one correspondence between blocks and objects, we only need **one** increasing slice and one final flush when writing sequentially. This maximizes the write performance of the object storage. A simple [JuiceFS benchmark](../benchmark/performance_evaluation_guide.md) below shows sequentially writing a 1 GiB file with a 1 MiB I/O size at its first stage. The following figure shows the data flow in each component of the system.
+
+![write](../images/internals-write.png)
+
+> **NOTICE**: Compression and encryption in this figure are disabled by default. To enable these features, please add option `--compress value` or `--encrypt-rsa-key value` to the formatting command.
+
+To make it more intuitive, the following metrics figure shows the metrics from the `stats` command.
+
+![stats](../images/internals-stats.png)
+
+From the first highlighted section in the above figure, we can see,
+
+- The average size of I/O writing to the object storage is `object.put / object.put_c = 4 MiB`. It is the same as the default size of a block.
+- The ratio of metadata transactions to object storage transactions is `meta.txn : object.put_c -= 1 : 16`. It means a single slice flush requires 1 update of metadata and 16 uploads to the object storage. It also shows that every flush operation transmits 4 MiB * 16 = 64 MiB of data, the same as the default size of a chunk.
+- The average request size in the FUSE layer approximately equals to `fuse.write / fuse.ops ~= 128 KiB`, which is the same as the default limitation of the request size.
+
+Compared to sequential write, random write in a large file is more complicated. There could be **a number of intermittent** slices in a chunk, which makes it hard to crop the data into a size of 4 MiB, and lowers the performance since it requires multiple metadata updates.
+
+Generally, when writing a small file, the file will be uploaded to the object storage when it is being closed, and the I/O size is the same as the file size. It could also be seen from the third highlighted section (creating 128 KiB small files) in the above metrics figure that,
+
+- The PUT size to the object storage is 128 KiB, calculated by `object.put / object.put_c`.
+- The number of metadata transactions is two times to the number of PUT in approximate, since every file requires one create and one write.
+
+It's worth mentioning that, when uploading objects which are smaller than a block, JuiceFS will try to write them simultaneously into the local cache (specified by `--cache-dir`, both memory and disk are available) attempting to improve performance in the future. From the metrics figure above, we can see that when writing small files, the write bandwidth of the blockcache is the same as that of the object. Since the small files are cached, reading these small files is extremely fast (as shown in the fourth highlighted section).
+
+JuiceFS has very low write latency, about several microseconds in general. It is because a write operation will return immediately once it is done writing to the memory buffer of the client. It will not actually upload to the object storage until the upload action is triggered by internal events or by external applications. The internal events like the exceeding of the slice size, the slice number or the buffering time will trigger the upload action automatically, and the external application events such as closing a file or invoking `fsync` could also trigger the upload action. Since the buffer capacity will only be released after the data stored in the buffer is persisted, we may encounter a write block if the object storage is not fast enough to handle large-scale concurrencies to keep the buffer being released timely. Specifically, the default buffer size is 300 MiB, which can be set by the mount option `--buffer-size`. The usage of the buffer in realtime is shown in the `usage.buf` field in the metrics figure. JuiceFS client will prepend a 10ms delay to every write operation to slow down the operation if the buffer usage exceeds the threshold. New writes will be suspended until the buffer is released, if the usage of the buffer is over twice the threshold. Therefore, if the write latency keeps increasing or the buffer usage has exceeded the threshold for a long while, a larger `--buffer-size` may be needed. In addition, increasing `--max-uploads`, which is the maximum number of concurrencies that defaults to 20, could also be helpful to improve the bandwidth for writing to the object storage, thus boosting the buffer releasing.
+
+### Writeback mode
+
+Enabling `--writeback` when mounting is also an option to further improve the performance if the data consistency and reliability are not crucial. If the writeback mode is enabled, slice flush operation will return immediately after writing data to the local staging directory shared with cache. The data will then be uploaded asynchronously to the object storage by a backend thread. It's worth mentioning that, different from the so-called _write to memory first_ mechanism, the writeback mode of JuiceFS writes data into a local cache directory (details vary with the hardware and the local file systems used for the cache directory in practice). In other words, the local directory is a cache layer of the object storage.
+
+With the writeback mode enabled, JuiceFS will aggressively preserve all of the data into the cache directory without checking the size of the objects to be uploaded by default. This is useful in some scenarios which generate a large number of intermediate files such as compiling software. In addition, a new parameter `--upload-delay` has been introduced since JuiceFS v0.17, which is for delaying the upload action and caching the data locally in a more aggressive way. If a file has been deleted before being uploaded, the upload action will ignore this file. This can not only improve performance but also save cost. Meanwhile, compared with a local disk, JuiceFS uploads files automatically when the cache directory is running out of space, which keeps the applications away from unexcepted failures. This is useful for applications requiring temporary file storage such as Spark shuffle.
+
+## Workflow of processing read
+
+JuiceFS reads objects from object storage block by block in a size of 4 MiB, which could be considered as a kind of read-ahead. Data read will be saved into the local cache directory for future use, proven by the high write bandwidth of blockcache shown in the 2nd highlighted section in the above metrics figure. Obviously, all the cached data will be accessed by subsequent reads, and the high cache hit rate can maximize the object storage read/write performance. The dataflow along each component of this case shows as follows:
+
+![read](../images/internals-read.png)
+
+> **NOTICE**: When a read object arrives, if the decryption and compression are enabled, it will be first decrypted and then uncompressed by JuiceFS client, which is contrary to write.
+
+This strategy is not effective for randomly reading a small block within a large file. In this case, the system utilization will be lower due to the read amplification and the frequent write and evict to the local cache. Unfortunately, it is hard to gain a high benefit from a cache system in this case. One possible solution is to enlarge the total capacity of the cache system to cache as much data as possible, while another solution could be disabling cache by setting `--cache-size 0` and using an object storage with a performance as high as possible.
+
+Reading small files is much easier. The whole file is often read in a single request. Since small files are cached first before writing to an object storage, if a file is read soon after it is written, the read operation will hit the local cache, like what JuiceFS bench does, and an impressive performance can be expected.
diff --git a/go.mod b/go.mod
index 47d7bb1f..817ea624 100644
--- a/go.mod
+++ b/go.mod
@@ -53,7 +53,6 @@ require (
 	github.com/pyroscope-io/client v0.2.1
 	github.com/qingstor/qingstor-sdk-go/v4 v4.4.0
 	github.com/qiniu/go-sdk/v7 v7.11.1
-	github.com/satori/go.uuid v1.2.0
 	github.com/sirupsen/logrus v1.8.1
 	github.com/smartystreets/goconvey v1.7.2
 	github.com/tencentyun/cos-go-sdk-v5 v0.7.34
@@ -87,7 +86,6 @@ require (
 	github.com/acarl005/stripansi v0.0.0-20180116102854-5a71ef0e047d // indirect
 	github.com/alecthomas/participle v0.2.1 // indirect
 	github.com/armon/go-metrics v0.0.0-20180917152333-f0300d1749da // indirect
-	github.com/baiyubin/aliyun-sts-go-sdk v0.0.0-20180326062324-cfa1a18b161f // indirect
 	github.com/bcicen/jstream v1.0.1 // indirect
 	github.com/beevik/ntp v0.3.0 // indirect
 	github.com/benbjohnson/clock v1.1.0 // indirect
@@ -96,7 +94,7 @@ require (
 	github.com/cespare/xxhash/v2 v2.1.2 // indirect
 	github.com/cheggaaa/pb v1.0.29 // indirect
 	github.com/clbanning/mxj v1.8.4 // indirect
-	github.com/coredns/coredns v1.4.0 // indirect
+	github.com/coredns/coredns v1.6.6 // indirect
 	github.com/coreos/etcd v3.3.10+incompatible // indirect
 	github.com/coreos/go-semver v0.3.0 // indirect
 	github.com/coreos/go-systemd v0.0.0-20191104093116-d3cd4ed1dbcf // indirect
@@ -142,7 +140,7 @@ require (
 	github.com/hashicorp/go-rootcerts v1.0.2 // indirect
 	github.com/hashicorp/go-sockaddr v1.0.2 // indirect
 	github.com/hashicorp/go-uuid v1.0.2 // indirect
-	github.com/hashicorp/golang-lru v0.5.1 // indirect
+	github.com/hashicorp/golang-lru v0.5.3 // indirect
 	github.com/hashicorp/hcl v1.0.0 // indirect
 	github.com/hashicorp/serf v0.9.6 // indirect
 	github.com/hashicorp/vault/api v1.0.4 // indirect
diff --git a/go.sum b/go.sum
index 624c2742..f3544933 100644
--- a/go.sum
+++ b/go.sum
@@ -1,6 +1,7 @@
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
+cloud.google.com/go v0.41.0/go.mod h1:OauMR7DV8fzvZIl2qg6rkaIhD/vmgk4iwEw/h6ercmg=
 cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
 cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
 cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
@@ -55,6 +56,7 @@ cloud.google.com/go/storage v1.8.0/go.mod h1:Wv1Oy7z6Yz3DshWRJFhqM/UCfaWIRTdp0RX
 cloud.google.com/go/storage v1.10.0/go.mod h1:FLPqc6j+Ki4BU591ie1oL6qBQGu2Bl/tZ9ullr3+Kg0=
 cloud.google.com/go/storage v1.21.0 h1:HwnT2u2D309SFDHQII6m18HlrCi3jAXhUMTLOWXYH14=
 cloud.google.com/go/storage v1.21.0/go.mod h1:XmRlxkgPjlBONznT2dDUU/5XlpU2OjMnKuqnZI01LAA=
+contrib.go.opencensus.io/exporter/ocagent v0.4.12/go.mod h1:450APlNTSR6FrvC3CTRqYosuDstRB9un7SOx2k/9ckA=
 dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
 git.apache.org/thrift.git v0.13.0 h1:/3bz5WZ+sqYArk7MBBBbDufMxKKOA56/6JO6psDpUDY=
 git.apache.org/thrift.git v0.13.0/go.mod h1:fPE2ZNJGynbRyZ4dJvy6G277gSllfV2HJqblrnkyeyg=
@@ -64,17 +66,46 @@ gitea.com/xorm/sqlfiddle v0.0.0-20180821085327-62ce714f951a h1:lSA0F4e9A2NcQSqGq
 gitea.com/xorm/sqlfiddle v0.0.0-20180821085327-62ce714f951a/go.mod h1:EXuID2Zs0pAQhH8yz+DNjUbjppKQzKFAn28TMYPB6IU=
 github.com/Arvintian/scs-go-sdk v1.1.0 h1:vqVOfoMD6XSr7eG1a2M9oSiQwhDZYKKdH2rrZRPx6So=
 github.com/Arvintian/scs-go-sdk v1.1.0/go.mod h1:DMIkwn27iuTIo9o7INj3L/bcA7bW6QwljWC3ZpxjkXw=
+github.com/Azure/azure-sdk-for-go v32.4.0+incompatible/go.mod h1:9XXNKU+eRnpl9moKnB4QOLf1HestfXbmab5FXxiDBjc=
+github.com/Azure/azure-sdk-for-go v32.6.0+incompatible h1:PgaVceWF5idtJajyt1rzq1cep6eRPJ8+8hs4GnNzTo0=
+github.com/Azure/azure-sdk-for-go v32.6.0+incompatible/go.mod h1:9XXNKU+eRnpl9moKnB4QOLf1HestfXbmab5FXxiDBjc=
 github.com/Azure/azure-sdk-for-go/sdk/azcore v0.21.1 h1:qoVeMsc9/fh/yhxVaA0obYjVH/oI/ihrOoMwsLS9KSA=
 github.com/Azure/azure-sdk-for-go/sdk/azcore v0.21.1/go.mod h1:fBF9PQNqB8scdgpZ3ufzaLntG0AG7C1WjPMsiFOmfHM=
 github.com/Azure/azure-sdk-for-go/sdk/internal v0.8.3 h1:E+m3SkZCN0Bf5q7YdTs5lSm2CYY3CK4spn5OmUIiQtk=
 github.com/Azure/azure-sdk-for-go/sdk/internal v0.8.3/go.mod h1:KLF4gFr6DcKFZwSuH8w8yEK6DpFl3LP5rhdvAb7Yz5I=
 github.com/Azure/azure-sdk-for-go/sdk/storage/azblob v0.3.0 h1:Px2UA+2RvSSvv+RvJNuUB6n7rs5Wsel4dXLe90Um2n4=
 github.com/Azure/azure-sdk-for-go/sdk/storage/azblob v0.3.0/go.mod h1:tPaiy8S5bQ+S5sOiDlINkp7+Ef339+Nz5L5XO+cnOHo=
+github.com/Azure/go-autorest v11.1.2+incompatible/go.mod h1:r+4oMnoxhatjLLJ6zxSWATqVooLgysK6ZNox3g/xq24=
+github.com/Azure/go-autorest/autorest v0.1.0/go.mod h1:AKyIcETwSUFxIcs/Wnq/C+kwCtlEYGUVd7FPNb2slmg=
+github.com/Azure/go-autorest/autorest v0.5.0/go.mod h1:9HLKlQjVBH6U3oDfsXOeVc56THsLPw1L03yban4xThw=
+github.com/Azure/go-autorest/autorest v0.9.0/go.mod h1:xyHB1BMZT0cuDHU7I0+g046+BFDTQ8rEZB0s4Yfa6bI=
+github.com/Azure/go-autorest/autorest v0.9.2/go.mod h1:xyHB1BMZT0cuDHU7I0+g046+BFDTQ8rEZB0s4Yfa6bI=
+github.com/Azure/go-autorest/autorest v0.9.3/go.mod h1:GsRuLYvwzLjjjRoWEIyMUaYq8GNUx2nRB378IPt/1p0=
+github.com/Azure/go-autorest/autorest/adal v0.1.0/go.mod h1:MeS4XhScH55IST095THyTxElntu7WqB7pNbZo8Q5G3E=
+github.com/Azure/go-autorest/autorest/adal v0.2.0/go.mod h1:MeS4XhScH55IST095THyTxElntu7WqB7pNbZo8Q5G3E=
+github.com/Azure/go-autorest/autorest/adal v0.5.0/go.mod h1:8Z9fGy2MpX0PvDjB1pEgQTmVqjGhiHBW7RJJEciWzS0=
+github.com/Azure/go-autorest/autorest/adal v0.8.0/go.mod h1:Z6vX6WXXuyieHAXwMj0S6HY6e6wcHn37qQMBQlvY3lc=
+github.com/Azure/go-autorest/autorest/azure/auth v0.1.0/go.mod h1:Gf7/i2FUpyb/sGBLIFxTBzrNzBo7aPXXE3ZVeDRwdpM=
+github.com/Azure/go-autorest/autorest/azure/auth v0.4.1/go.mod h1:5TgH20II424SXIV9YDBsO4rBCKsh39Vbx9DvhJZZ8rU=
+github.com/Azure/go-autorest/autorest/azure/cli v0.1.0/go.mod h1:Dk8CUAt/b/PzkfeRsWzVG9Yj3ps8mS8ECztu43rdU8U=
+github.com/Azure/go-autorest/autorest/azure/cli v0.3.1/go.mod h1:ZG5p860J94/0kI9mNJVoIoLgXcirM2gF5i2kWloofxw=
+github.com/Azure/go-autorest/autorest/date v0.1.0/go.mod h1:plvfp3oPSKwf2DNjlBjWF/7vwR+cUD/ELuzDCXwHUVA=
+github.com/Azure/go-autorest/autorest/date v0.2.0/go.mod h1:vcORJHLJEh643/Ioh9+vPmf1Ij9AEBM5FuBIXLmIy0g=
+github.com/Azure/go-autorest/autorest/mocks v0.1.0/go.mod h1:OTyCOPRA2IgIlWxVYxBee2F5Gr4kF2zd2J5cFRaIDN0=
+github.com/Azure/go-autorest/autorest/mocks v0.2.0/go.mod h1:OTyCOPRA2IgIlWxVYxBee2F5Gr4kF2zd2J5cFRaIDN0=
+github.com/Azure/go-autorest/autorest/mocks v0.3.0/go.mod h1:a8FDP3DYzQ4RYfVAxAN3SVSiiO77gL2j2ronKKP0syM=
+github.com/Azure/go-autorest/autorest/to v0.2.0/go.mod h1:GunWKJp1AEqgMaGLV+iocmRAJWqST1wQYhyyjXJ3SJc=
+github.com/Azure/go-autorest/autorest/validation v0.1.0/go.mod h1:Ha3z/SqBeaalWQvokg3NZAlQTalVMtOIAs1aGK7G6u8=
+github.com/Azure/go-autorest/logger v0.1.0/go.mod h1:oExouG+K6PryycPJfVSxi/koC6LSNgds39diKLz7Vrc=
+github.com/Azure/go-autorest/tracing v0.1.0/go.mod h1:ROEEAFwXycQw7Sn3DXNtEedEvdeRAgDr0izn4z5Ij88=
+github.com/Azure/go-autorest/tracing v0.5.0/go.mod h1:r/s2XiOKccPW3HrqB+W0TQzfbtp2fGCgRFtBroKn4Dk=
 github.com/Azure/go-ntlmssp v0.0.0-20200615164410-66371956d46c h1:/IBSNwUN8+eKzUzbJPqhK839ygXJ82sde8x3ogr6R28=
 github.com/Azure/go-ntlmssp v0.0.0-20200615164410-66371956d46c/go.mod h1:chxPXzSsl7ZWRAuOIE23GDNzjWuZquvFlgA8xmpunjU=
 github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
+github.com/DataDog/datadog-go v2.2.0+incompatible/go.mod h1:LButxg5PwREeZtORoXG3tL4fMGNddJ+vMq1mwgfaqoQ=
+github.com/DataDog/zstd v1.3.5/go.mod h1:1jcaCB/ufaK+sKp1NBhlGmpz41jOoPQ35bpF36t7BBo=
 github.com/DataDog/zstd v1.5.0 h1:+K/VEwIAaPcHiMtQvpLD4lqW7f0Gk3xdYZmI1hD+CXo=
 github.com/DataDog/zstd v1.5.0/go.mod h1:g4AWEaM3yOg3HYfnJ3YIawPnVdXJh9QME85blwSAmyw=
 github.com/IBM/ibm-cos-sdk-go v1.8.0 h1:6d3BY+jo71JvQoyUwdtv4pemEfbnK/XSKQCKOEuWmks=
@@ -84,8 +115,12 @@ github.com/NetEase-Object-Storage/nos-golang-sdk v0.0.0-20191125093154-335c2b73b
 github.com/NetEase-Object-Storage/nos-golang-sdk v0.0.0-20191125093154-335c2b73bf6b/go.mod h1:0N5CbwYI/8V1T6YOEwkgMvLmiGDNn661vLutBZQrC2c=
 github.com/OneOfOne/xxhash v1.2.2 h1:KMrpdQIwFcEqXDklaen+P1axHaj9BSKzvpUUfnHldSE=
 github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
+github.com/OpenDNS/vegadns2client v0.0.0-20180418235048-a3fa4a771d87/go.mod h1:iGLljf5n9GjT6kc0HBvyI1nOKnGQbNB66VzSNbK5iks=
 github.com/PuerkitoBio/goquery v1.5.1/go.mod h1:GsLWisAFVj4WgDibEWF4pvYnkVQBpKBKeU+7zCJoLcc=
 github.com/QcloudApi/qcloud_sign_golang v0.0.0-20141224014652-e4130a326409/go.mod h1:1pk82RBxDY/JZnPQrtqHlUFfCctgdorsd9M06fMynOM=
+github.com/Shopify/sarama v1.19.0/go.mod h1:FVkBWblsNy7DGZRfXLU0O9RCGt5g3g3yEuWXgklEdEo=
+github.com/Shopify/sarama v1.21.0/go.mod h1:yuqtN/pe8cXRWG5zPaO7hCfNJp5MwmkoJEoLjkm5tCQ=
+github.com/Shopify/toxiproxy v2.1.4+incompatible/go.mod h1:OXgGpZ6Cli1/URJOF1DMxUHB2q5Ap20/P/eIdh4G0pI=
 github.com/StackExchange/wmi v0.0.0-20190523213315-cbe66965904d/go.mod h1:3eOhrUMpNV+6aFIbp5/iudMxNCF27Vw2OZgy4xEx0Fg=
 github.com/StackExchange/wmi v1.2.1 h1:VIkavFPXSjcnS+O8yTq7NI32k0R5Aj+v39y29VYDOSA=
 github.com/StackExchange/wmi v1.2.1/go.mod h1:rcmrprowKIVzvc+NUiLncP2uuArMWLCbu9SBzvHz7e8=
@@ -95,6 +130,8 @@ github.com/acarl005/stripansi v0.0.0-20180116102854-5a71ef0e047d h1:licZJFw2RwpH
 github.com/acarl005/stripansi v0.0.0-20180116102854-5a71ef0e047d/go.mod h1:asat636LX7Bqt5lYEZ27JNDcqxfjdBQuJ/MM4CN/Lzo=
 github.com/agiledragon/gomonkey/v2 v2.6.0 h1:RzdlW1ibfVipfXKy9U4zYumdHTIY7RoZwyXY3tXLYd8=
 github.com/agiledragon/gomonkey/v2 v2.6.0/go.mod h1:ap1AmDzcVOAz1YpeJ3TCzIgstoaWLA6jbbgxfB4w2iY=
+github.com/akamai/AkamaiOPEN-edgegrid-golang v0.9.0/go.mod h1:zpDJeKyp9ScW4NNrbdr+Eyxvry3ilGPewKoXw3XGN1k=
+github.com/alangpierce/go-forceexport v0.0.0-20160317203124-8f1d6941cd75/go.mod h1:uAXEEpARkRhCZfEvy/y0Jcc888f9tHCc1W7/UeEtreE=
 github.com/alecthomas/participle v0.2.1 h1:4AVLj1viSGa4LG5HDXKXrm5xRx19SB/rS/skPQB1Grw=
 github.com/alecthomas/participle v0.2.1/go.mod h1:SW6HZGeZgSIpcUWX3fXpfZhuaWHnmoD5KCVaqSaNTkk=
 github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
@@ -102,18 +139,24 @@ github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuy
 github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
 github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
 github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d/go.mod h1:rBZYJk541a8SKzHPHnH3zbiI+7dagKZ0cgpgrD7Fyho=
+github.com/aliyun/alibaba-cloud-sdk-go v0.0.0-20190808125512-07798873deee/go.mod h1:myCDvQSzCW+wB1WAlocEru4wMGJxy+vlxHdhegi1CDQ=
+github.com/aliyun/aliyun-oss-go-sdk v0.0.0-20190307165228-86c17b95fcd5/go.mod h1:T/Aws4fEfogEE9v+HPhhw+CntffsBHJ8nXQCwKr0/g8=
 github.com/aliyun/aliyun-oss-go-sdk v2.2.2+incompatible h1:9gWa46nstkJ9miBReJcN8Gq34cBFbzSpQZVVT9N09TM=
 github.com/aliyun/aliyun-oss-go-sdk v2.2.2+incompatible/go.mod h1:T/Aws4fEfogEE9v+HPhhw+CntffsBHJ8nXQCwKr0/g8=
 github.com/andybalholm/cascadia v1.1.0/go.mod h1:GsXiBklL0woXo1j/WYWtSYYC4ouU9PqHO0sqidkEA4Y=
 github.com/antihax/optional v0.0.0-20180407024304-ca021399b1a6/go.mod h1:V8iCPQYkqmusNa815XgQio277wI47sdRh1dUOLdyC6Q=
 github.com/antihax/optional v1.0.0/go.mod h1:uupD/76wgC+ih3iEmQUL+0Ugr19nfwCT1kdvxnR2qWY=
+github.com/apache/thrift v0.12.0/go.mod h1:cp2SuWMxlEZw2r+iP2GNCdIi4C1qmUzdZFSVb+bacwQ=
+github.com/apache/thrift v0.13.0/go.mod h1:cp2SuWMxlEZw2r+iP2GNCdIi4C1qmUzdZFSVb+bacwQ=
 github.com/armon/circbuf v0.0.0-20150827004946-bbbad097214e/go.mod h1:3U/XgcO3hCbHZ8TKRvWD2dDTCfh9M9ya+I9JpbB7O8o=
 github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6/go.mod h1:grANhF5doyWs3UAsr3K4I6qtAmlQcZDesFNEHPZAzj8=
 github.com/armon/go-metrics v0.0.0-20180917152333-f0300d1749da h1:8GUt8eRujhVEGZFFEjBj46YV4rDjvGrNxb0KMWYkL2I=
 github.com/armon/go-metrics v0.0.0-20180917152333-f0300d1749da/go.mod h1:Q73ZrmVTwzkszR9V5SSuryQ31EELlFMUz1kKyl939pY=
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@@ -134,14 +177,19 @@ github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6r
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@@ -150,6 +198,7 @@ github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMn
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@@ -158,26 +207,35 @@ github.com/cncf/xds/go v0.0.0-20210312221358-fbca930ec8ed/go.mod h1:eXthEFrGJvWH
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@@ -223,6 +293,10 @@ github.com/envoyproxy/go-control-plane v0.9.10-0.20210907150352-cf90f659a021/go.
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@@ -231,17 +305,23 @@ github.com/fatih/structs v1.1.0 h1:Q7juDM0QtcnhCpeyLGQKyg4TOIghuNXrkL32pHAUMxo=
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@@ -252,6 +332,7 @@ github.com/go-ldap/ldap/v3 v3.2.4/go.mod h1:iYS1MdmrmceOJ1QOTnRXrIs7i3kloqtmGQjR
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@@ -275,11 +356,14 @@ github.com/gofrs/flock v0.8.1 h1:+gYjHKf32LDeiEEFhQaotPbLuUXjY5ZqxKgXy7n59aw=
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@@ -287,6 +371,8 @@ github.com/golang-jwt/jwt v3.2.2+incompatible/go.mod h1:8pz2t5EyA70fFQQSrl6XZXzq
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@@ -302,6 +388,7 @@ github.com/golang/mock v1.5.0/go.mod h1:CWnOUgYIOo4TcNZ0wHX3YZCqsaM1I1Jvs6v3mP3K
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@@ -324,6 +411,7 @@ github.com/golang/snappy v0.0.1/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEW
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@@ -346,6 +434,7 @@ github.com/google/go-cmp v0.5.7 h1:81/ik6ipDQS2aGcBfIN5dHDB36BwrStyeAQquSYCV4o=
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@@ -373,6 +462,7 @@ github.com/google/pprof v0.0.0-20210720184732-4bb14d4b1be1/go.mod h1:kpwsk12EmLe
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@@ -382,10 +472,17 @@ github.com/googleapis/gax-go/v2 v2.0.5/go.mod h1:DWXyrwAJ9X0FpwwEdw+IPEYBICEFu5m
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@@ -393,11 +490,19 @@ github.com/gorilla/securecookie v1.1.1/go.mod h1:ra0sb63/xPlUeL+yeDciTfxMRAA+MP+
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@@ -437,8 +542,9 @@ github.com/hashicorp/go-uuid v1.0.2 h1:cfejS+Tpcp13yd5nYHWDI6qVCny6wyX2Mt5SGur2I
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@@ -797,25 +971,39 @@ github.com/tikv/client-go/v2 v2.0.1 h1:+K/VvVOxEOXKMtR83bs5Aj3lrYdTdTZdvH0apfAWW
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 github.com/xlab/treeprint v1.1.0/go.mod h1:gj5Gd3gPdKtR1ikdDK6fnFLdmIS0X30kTTuNd/WEJu0=
 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=
@@ -824,6 +1012,8 @@ github.com/yuin/goldmark v1.1.32/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9de
 github.com/yuin/goldmark v1.2.1/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 github.com/yuin/goldmark v1.3.5/go.mod h1:mwnBkeHKe2W/ZEtQ+71ViKU8L12m81fl3OWwC1Zlc8k=
 github.com/ziutek/mymysql v1.5.4/go.mod h1:LMSpPZ6DbqWFxNCHW77HeMg9I646SAhApZ/wKdgO/C0=
+go.etcd.io/bbolt v1.3.3/go.mod h1:IbVyRI1SCnLcuJnV2u8VeU0CEYM7e686BmAb1XKL+uU=
+go.etcd.io/etcd v0.5.0-alpha.5.0.20190917205325-a14579fbfb1a/go.mod h1:dnLIgRNXwCJa5e+c6mIZCrds/GIG4ncV9HhK5PX7jPg=
 go.etcd.io/etcd v3.3.27+incompatible h1:5hMrpf6REqTHV2LW2OclNpRtxI0k9ZplMemJsMSWju0=
 go.etcd.io/etcd v3.3.27+incompatible/go.mod h1:yaeTdrJi5lOmYerz05bd8+V7KubZs8YSFZfzsF9A6aI=
 go.etcd.io/etcd/api/v3 v3.5.2 h1:tXok5yLlKyuQ/SXSjtqHc4uzNaMqZi2XsoSPr/LlJXI=
@@ -832,6 +1022,8 @@ go.etcd.io/etcd/client/pkg/v3 v3.5.2 h1:4hzqQ6hIb3blLyQ8usCU4h3NghkqcsohEQ3o3Vet
 go.etcd.io/etcd/client/pkg/v3 v3.5.2/go.mod h1:IJHfcCEKxYu1Os13ZdwCwIUTUVGYTSAM3YSwc9/Ac1g=
 go.etcd.io/etcd/client/v3 v3.5.2 h1:WdnejrUtQC4nCxK0/dLTMqKOB+U5TP/2Ya0BJL+1otA=
 go.etcd.io/etcd/client/v3 v3.5.2/go.mod h1:kOOaWFFgHygyT0WlSmL8TJiXmMysO/nNUlEsSsN6W4o=
+go.opencensus.io v0.20.1/go.mod h1:6WKK9ahsWS3RSO+PY9ZHZUfv2irvY6gN279GOPZjmmk=
+go.opencensus.io v0.20.2/go.mod h1:6WKK9ahsWS3RSO+PY9ZHZUfv2irvY6gN279GOPZjmmk=
 go.opencensus.io v0.21.0/go.mod h1:mSImk1erAIZhrmZN+AvHh14ztQfjbGwt4TtuofqLduU=
 go.opencensus.io v0.22.0/go.mod h1:+kGneAE2xo2IficOXnaByMWTGM9T73dGwxeWcUqIpI8=
 go.opencensus.io v0.22.2/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
@@ -858,6 +1050,7 @@ go.uber.org/multierr v1.4.0/go.mod h1:VgVr7evmIr6uPjLBxg28wmKNXyqE9akIJ5XnfpiKl+
 go.uber.org/multierr v1.6.0/go.mod h1:cdWPpRnG4AhwMwsgIHip0KRBQjJy5kYEpYjJxpXp9iU=
 go.uber.org/multierr v1.7.0 h1:zaiO/rmgFjbmCXdSYJWQcdvOCsthmdaHfr3Gm2Kx4Ec=
 go.uber.org/multierr v1.7.0/go.mod h1:7EAYxJLBy9rStEaz58O2t4Uvip6FSURkq8/ppBp95ak=
+go.uber.org/ratelimit v0.0.0-20180316092928-c15da0234277/go.mod h1:2X8KaoNd1J0lZV+PxJk/5+DGbO/tpwLR1m++a7FnB/Y=
 go.uber.org/tools v0.0.0-20190618225709-2cfd321de3ee/go.mod h1:vJERXedbb3MVM5f9Ejo0C68/HhF8uaILCdgjnY+goOA=
 go.uber.org/zap v1.9.1/go.mod h1:vwi/ZaCAaUcBkycHslxD9B2zi4UTXhF60s6SWpuDF0Q=
 go.uber.org/zap v1.10.0/go.mod h1:vwi/ZaCAaUcBkycHslxD9B2zi4UTXhF60s6SWpuDF0Q=
@@ -867,15 +1060,23 @@ go.uber.org/zap v1.19.0/go.mod h1:xg/QME4nWcxGxrpdeYfq7UvYrLh66cuVKdrbD1XF/NI=
 go.uber.org/zap v1.20.0 h1:N4oPlghZwYG55MlU6LXk/Zp00FVNE9X9wrYO8CEs4lc=
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@@ -923,12 +1124,17 @@ golang.org/x/mod v0.4.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
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@@ -938,7 +1144,9 @@ golang.org/x/net v0.0.0-20190613194153-d28f0bde5980/go.mod h1:z5CRVTTTmAJ677TzLL
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
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+golang.org/x/net v0.0.0-20190813141303-74dc4d7220e7/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
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+golang.org/x/net v0.0.0-20190930134127-c5a3c61f89f3/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
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@@ -975,6 +1183,7 @@ golang.org/x/net v0.0.0-20220127200216-cd36cc0744dd h1:O7DYs+zxREGLKzKoMQrtrEacp
 golang.org/x/net v0.0.0-20220127200216-cd36cc0744dd/go.mod h1:CfG3xpIq0wQ8r1q4Su4UZFWDARRcnwPjda9FqA0JpMk=
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@@ -1002,15 +1211,19 @@ golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9/go.mod h1:RxMgew5VJxzue5/jJ
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@@ -1022,6 +1235,8 @@ golang.org/x/sys v0.0.0-20190507160741-ecd444e8653b/go.mod h1:h1NjWce9XRLGQEsW7w
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@@ -1029,9 +1244,11 @@ golang.org/x/sys v0.0.0-20190924154521-2837fb4f24fe/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20191001151750-bb3f8db39f24/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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@@ -1104,12 +1321,16 @@ golang.org/x/text v0.3.5/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
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@@ -1123,6 +1344,7 @@ golang.org/x/tools v0.0.0-20190506145303-2d16b83fe98c/go.mod h1:RgjU9mgBXZiqYHBn
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@@ -1178,6 +1400,7 @@ golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8T
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@@ -1224,11 +1447,13 @@ google.golang.org/appengine v1.6.6/go.mod h1:8WjMMxjGQR8xUklV/ARdw2HLXBOI7O7uCID
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@@ -1298,11 +1523,14 @@ google.golang.org/genproto v0.0.0-20220222213610-43724f9ea8cf/go.mod h1:kGP+zUP2
 google.golang.org/genproto v0.0.0-20220310185008-1973136f34c6 h1:FglFEfyj61zP3c6LgjmVHxYxZWXYul9oiS1EZqD5gLc=
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+google.golang.org/grpc v1.17.0/go.mod h1:6QZJwpn2B+Zp71q/5VxRsJ6NXXVCE5NRUHRo+f3cWCs=
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+google.golang.org/grpc v1.19.1/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
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+google.golang.org/grpc v1.23.1/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
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@@ -1345,6 +1573,7 @@ google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp0
 google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
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+gopkg.in/DataDog/dd-trace-go.v1 v1.19.0/go.mod h1:DVp8HmDh8PuTu2Z0fVVlBsyWaC++fzwVCaGWylTe3tg=
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@@ -1353,19 +1582,30 @@ gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8
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 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
+gopkg.in/cheggaaa/pb.v1 v1.0.25/go.mod h1:V/YB90LKu/1FcN3WVnfiiE5oMCibMjukxqG/qStrOgw=
 gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
 gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
+gopkg.in/h2non/gock.v1 v1.0.15/go.mod h1:sX4zAkdYX1TRGJ2JY156cFspQn4yRWn6p9EMdODlynE=
+gopkg.in/inf.v0 v0.9.0/go.mod h1:cWUDdTG/fYaXco+Dcufb5Vnc6Gp2YChqWtbxRZE0mXw=
+gopkg.in/inf.v0 v0.9.1/go.mod h1:cWUDdTG/fYaXco+Dcufb5Vnc6Gp2YChqWtbxRZE0mXw=
+gopkg.in/ini.v1 v1.42.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
+gopkg.in/ini.v1 v1.44.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
 gopkg.in/ini.v1 v1.57.0 h1:9unxIsFcTt4I55uWluz+UmL95q4kdJ0buvQ1ZIqVQww=
 gopkg.in/ini.v1 v1.57.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
 gopkg.in/kothar/go-backblaze.v0 v0.0.0-20210124194846-35409b867216 h1:2TSTkQ8PMvGOD5eeqqRVv6Z9+BYI+bowK97RCr3W+9M=
 gopkg.in/kothar/go-backblaze.v0 v0.0.0-20210124194846-35409b867216/go.mod h1:zJ2QpyDCYo1KvLXlmdnFlQAyF/Qfth0fB8239Qg7BIE=
+gopkg.in/mcuadros/go-syslog.v2 v2.2.1/go.mod h1:l5LPIyOOyIdQquNg+oU6Z3524YwrcqEm0aKH+5zpt2U=
 gopkg.in/natefinch/lumberjack.v2 v2.0.0 h1:1Lc07Kr7qY4U2YPouBjpCLxpiyxIVoxqXgkXLknAOE8=
 gopkg.in/natefinch/lumberjack.v2 v2.0.0/go.mod h1:l0ndWWf7gzL7RNwBG7wST/UCcT4T24xpD6X8LsfU/+k=
+gopkg.in/ns1/ns1-go.v2 v2.0.0-20190730140822-b51389932cbc/go.mod h1:VV+3haRsgDiVLxyifmMBrBIuCWFBPYKbRssXB9z67Hw=
+gopkg.in/resty.v1 v1.9.1/go.mod h1:vo52Hzryw9PnPHcJfPsBiFW62XhNx5OczbV9y+IMpgc=
+gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
 gopkg.in/square/go-jose.v2 v2.3.1 h1:SK5KegNXmKmqE342YYN2qPHEnUYeoMiXXl1poUlI+o4=
 gopkg.in/square/go-jose.v2 v2.3.1/go.mod h1:M9dMgbHiYLoDGQrXy7OpJDJWiKiU//h+vD76mk0e1AI=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
 gopkg.in/urfave/cli.v1 v1.20.0/go.mod h1:vuBzUtMdQeixQj8LVd+/98pzhxNGQoyuPBlsXHOQNO0=
+gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74=
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.3/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
@@ -1379,6 +1619,7 @@ gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C
 gopkg.in/yaml.v3 v3.0.0-20200615113413-eeeca48fe776/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b h1:h8qDotaEPuJATrMmW04NCwg7v22aHH28wwpauUhK9Oo=
 gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+honnef.co/go/tools v0.0.0-20180728063816-88497007e858/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
@@ -1386,11 +1627,22 @@ honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWh
 honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
 honnef.co/go/tools v0.0.1-2020.1.3/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
 honnef.co/go/tools v0.0.1-2020.1.4/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
+k8s.io/api v0.0.0-20190620084959-7cf5895f2711/go.mod h1:TBhBqb1AWbBQbW3XRusr7n7E4v2+5ZY8r8sAMnyFC5A=
+k8s.io/apimachinery v0.0.0-20190612205821-1799e75a0719/go.mod h1:I4A+glKBHiTgiEjQiCCQfCAIcIMFGt291SmsvcrFzJA=
+k8s.io/client-go v0.0.0-20190620085101-78d2af792bab/go.mod h1:E95RaSlHr79aHaX0aGSwcPNfygDiPKOVXdmivCIZT0k=
+k8s.io/klog v0.3.0/go.mod h1:Gq+BEi5rUBO/HRz0bTSXDUcqjScdoY3a9IHpCEIOOfk=
+k8s.io/klog v0.3.1/go.mod h1:Gq+BEi5rUBO/HRz0bTSXDUcqjScdoY3a9IHpCEIOOfk=
+k8s.io/klog v0.4.0/go.mod h1:4Bi6QPql/J/LkTDqv7R/cd3hPo4k2DG6Ptcz060Ez5I=
+k8s.io/kube-openapi v0.0.0-20190228160746-b3a7cee44a30/go.mod h1:BXM9ceUBTj2QnfH2MK1odQs778ajze1RxcmP6S8RVVc=
+k8s.io/kube-openapi v0.0.0-20190306001800-15615b16d372/go.mod h1:BXM9ceUBTj2QnfH2MK1odQs778ajze1RxcmP6S8RVVc=
+k8s.io/utils v0.0.0-20190221042446-c2654d5206da/go.mod h1:8k8uAuAQ0rXslZKaEWd0c3oVhZz7sSzSiPnVZayjIX0=
+k8s.io/utils v0.0.0-20190529001817-6999998975a7/go.mod h1:sZAwmy6armz5eXlNoLmJcl4F1QuKu7sr+mFQ0byX7Ew=
 rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
 rsc.io/goversion v1.2.0/go.mod h1:Eih9y/uIBS3ulggl7KNJ09xGSLcuNaLgmvvqa07sgfo=
 rsc.io/pdf v0.1.1/go.mod h1:n8OzWcQ6Sp37PL01nO98y4iUCRdTGarVfzxY20ICaU4=
 rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
 rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
+sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=
 sigs.k8s.io/yaml v1.2.0/go.mod h1:yfXDCHCao9+ENCvLSE62v9VSji2MKu5jeNfTrofGhJc=
 xorm.io/builder v0.3.7 h1:2pETdKRK+2QG4mLX4oODHEhn5Z8j1m8sXa7jfu+/SZI=
 xorm.io/builder v0.3.7/go.mod h1:aUW0S9eb9VCaPohFCH3j7czOx1PMW3i1HrSzbLYGBSE=
diff --git a/pkg/chunk/cached_store.go b/pkg/chunk/cached_store.go
index 24726338..2909b9be 100644
--- a/pkg/chunk/cached_store.go
+++ b/pkg/chunk/cached_store.go
@@ -289,7 +289,8 @@ func (c *rChunk) Remove() error {
 		// there could be multiple clients try to remove the same chunk in the same time,
 		// any of them should succeed if any blocks is removed
 		key := c.key(i)
-		c.store.removeStaging(key)
+		c.store.removePending(key)
+		c.store.bcache.remove(key)
 	}
 
 	if c.store.conf.MaxDeletes == 0 {
@@ -854,7 +855,7 @@ func (store *cachedStore) uploadStagingFile(key string, stagingPath string) {
 
 	if err = store.upload(key, block, nil); err == nil {
 		store.bcache.uploaded(key, blen)
-		store.removeStaging(key)
+		store.removePending(key)
 		if os.Remove(stagingPath) == nil {
 			stageBlocks.Sub(1)
 			stageBlockBytes.Sub(float64(blen))
@@ -876,11 +877,10 @@ func (store *cachedStore) addDelayedStaging(key, stagingPath string, added time.
 	return false
 }
 
-func (store *cachedStore) removeStaging(key string) {
+func (store *cachedStore) removePending(key string) {
 	store.pendingMutex.Lock()
 	delete(store.pendingKeys, key)
 	store.pendingMutex.Unlock()
-	store.bcache.remove(key)
 }
 
 func (store *cachedStore) scanDelayedStaging() {
diff --git a/pkg/gateway/gateway.go b/pkg/gateway/gateway.go
index 13a00aa6..2e1f3040 100644
--- a/pkg/gateway/gateway.go
+++ b/pkg/gateway/gateway.go
@@ -920,7 +920,8 @@ func (n *jfsObjects) AbortMultipartUpload(ctx context.Context, bucket, object, u
 
 func (n *jfsObjects) cleanup() {
 	for t := range time.Tick(24 * time.Hour) {
-		var tmpDirs []string
+		// default bucket tmp dirs
+		tmpDirs := []string{".sys/tmp/", ".sys/uploads/"}
 		if n.gConf.MultiBucket {
 			buckets, err := n.ListBuckets(context.Background())
 			if err != nil {
@@ -931,9 +932,6 @@ func (n *jfsObjects) cleanup() {
 				tmpDirs = append(tmpDirs, fmt.Sprintf(".sys/%s/tmp", bucket.Name))
 				tmpDirs = append(tmpDirs, fmt.Sprintf(".sys/%s/uploads", bucket.Name))
 			}
-		} else {
-			tmpDirs = append(tmpDirs, ".sys/tmp/")
-			tmpDirs = append(tmpDirs, ".sys/uploads/")
 		}
 		for _, dir := range tmpDirs {
 			f, errno := n.fs.Open(mctx, dir, 0)
diff --git a/pkg/meta/base.go b/pkg/meta/base.go
index 374e9188..6ad5a043 100644
--- a/pkg/meta/base.go
+++ b/pkg/meta/base.go
@@ -78,6 +78,7 @@ type engine interface {
 
 type baseMeta struct {
 	sync.Mutex
+	addr string
 	conf *Config
 	fmt  Format
 
@@ -104,7 +105,7 @@ type baseMeta struct {
 	en engine
 }
 
-func newBaseMeta(conf *Config) baseMeta {
+func newBaseMeta(addr string, conf *Config) baseMeta {
 	if conf.Retries == 0 {
 		conf.Retries = 10
 	}
@@ -112,6 +113,7 @@ func newBaseMeta(conf *Config) baseMeta {
 		conf.Heartbeat = 12 * time.Second
 	}
 	return baseMeta{
+		addr:         utils.RemovePassword(addr),
 		conf:         conf,
 		root:         1,
 		of:           newOpenFiles(conf.OpenCache),
diff --git a/pkg/meta/dump.go b/pkg/meta/dump.go
index c67ed178..484f7b83 100644
--- a/pkg/meta/dump.go
+++ b/pkg/meta/dump.go
@@ -262,25 +262,24 @@ func (dm *DumpedMeta) writeJsonWithOutTree(w io.Writer) (*bufio.Writer, error) {
 	return bw, nil
 }
 
-func dumpAttr(a *Attr) *DumpedAttr {
-	d := &DumpedAttr{
-		Type:      typeToString(a.Typ),
-		Mode:      a.Mode,
-		Uid:       a.Uid,
-		Gid:       a.Gid,
-		Atime:     a.Atime,
-		Mtime:     a.Mtime,
-		Ctime:     a.Ctime,
-		Atimensec: a.Atimensec,
-		Mtimensec: a.Mtimensec,
-		Ctimensec: a.Ctimensec,
-		Nlink:     a.Nlink,
-		Rdev:      a.Rdev,
-	}
+func dumpAttr(a *Attr, d *DumpedAttr) {
+	d.Type = typeToString(a.Typ)
+	d.Mode = a.Mode
+	d.Uid = a.Uid
+	d.Gid = a.Gid
+	d.Atime = a.Atime
+	d.Mtime = a.Mtime
+	d.Ctime = a.Ctime
+	d.Atimensec = a.Atimensec
+	d.Mtimensec = a.Mtimensec
+	d.Ctimensec = a.Ctimensec
+	d.Nlink = a.Nlink
+	d.Rdev = a.Rdev
 	if a.Typ == TypeFile {
 		d.Length = a.Length
+	} else {
+		d.Length = 0
 	}
-	return d
 }
 
 func loadAttr(d *DumpedAttr) *Attr {
diff --git a/pkg/meta/interface.go b/pkg/meta/interface.go
index 2e7a3289..5d2e892a 100644
--- a/pkg/meta/interface.go
+++ b/pkg/meta/interface.go
@@ -21,6 +21,7 @@ import (
 	"io"
 	"net/url"
 	"os"
+	"path"
 	"strings"
 	"syscall"
 	"time"
@@ -410,36 +411,68 @@ func timeit(start time.Time) {
 	opDist.Observe(time.Since(start).Seconds())
 }
 
-// Get full path of an inode; a random one is picked if it has multiple hard links
-func GetPath(m Meta, ctx Context, inode Ino) (string, syscall.Errno) {
-	var names []string
-	var attr Attr
-	for inode != 1 {
-		if st := m.GetAttr(ctx, inode, &attr); st != 0 {
-			logger.Debugf("getattr inode %d: %s", inode, st)
-			return "", st
+// Get all paths of an inode
+func GetPaths(m Meta, ctx Context, inode Ino) []string {
+	getDirPath := func(ino Ino) (string, error) {
+		var names []string
+		var attr Attr
+		for ino != 1 {
+			if st := m.GetAttr(ctx, ino, &attr); st != 0 {
+				return "", fmt.Errorf("getattr inode %d: %s", ino, st)
+			}
+			if attr.Typ != TypeDirectory {
+				return "", fmt.Errorf("inode %d is not a directory", ino)
+			}
+			var entries []*Entry
+			if st := m.Readdir(ctx, attr.Parent, 0, &entries); st != 0 {
+				return "", fmt.Errorf("readdir inode %d: %s", ino, st)
+			}
+			var name string
+			for _, e := range entries {
+				if e.Inode == ino {
+					name = string(e.Name)
+					break
+				}
+			}
+			if name == "" {
+				return "", fmt.Errorf("entry %d/%d not found", attr.Parent, ino)
+			}
+			names = append(names, name)
+			ino = attr.Parent
+		}
+		names = append(names, "/") // add root
+
+		for i, j := 0, len(names)-1; i < j; i, j = i+1, j-1 { // reverse
+			names[i], names[j] = names[j], names[i]
 		}
+		return path.Join(names...), nil
+	}
 
+	var paths []string
+	for parent, count := range m.GetParents(ctx, inode) {
+		if count <= 0 {
+			continue
+		}
+		dir, err := getDirPath(parent)
+		if err != nil {
+			logger.Warnf("Get directory path: %s", err)
+			continue
+		}
 		var entries []*Entry
-		if st := m.Readdir(ctx, attr.Parent, 0, &entries); st != 0 {
-			return "", st
+		if st := m.Readdir(ctx, parent, 0, &entries); st != 0 {
+			logger.Warnf("Readdir inode %d: %s", parent, st)
+			continue
 		}
-		var name string
+		var c int
 		for _, e := range entries {
 			if e.Inode == inode {
-				name = string(e.Name)
-				break
+				c++
+				paths = append(paths, path.Join(dir, string(e.Name)))
 			}
 		}
-		if name == "" {
-			return "", syscall.ENOENT
+		if c != count {
+			logger.Warnf("Expect to find %d entries under parent %d, but got %d", count, parent, c)
 		}
-		names = append(names, name)
-		inode = attr.Parent
-	}
-
-	for i, j := 0, len(names)-1; i < j; i, j = i+1, j-1 { // reverse
-		names[i], names[j] = names[j], names[i]
 	}
-	return "/" + strings.Join(names, "/"), 0
+	return paths
 }
diff --git a/pkg/meta/redis.go b/pkg/meta/redis.go
index 9bace2fd..37da4c34 100644
--- a/pkg/meta/redis.go
+++ b/pkg/meta/redis.go
@@ -32,6 +32,7 @@ import (
 	"net/url"
 	"os"
 	"runtime"
+	"runtime/debug"
 	"sort"
 	"strconv"
 	"strings"
@@ -76,7 +77,6 @@ type redisMeta struct {
 	prefix     string
 	shaLookup  string // The SHA returned by Redis for the loaded `scriptLookup`
 	shaResolve string // The SHA returned by Redis for the loaded `scriptResolve`
-	snap       *redisSnap
 }
 
 var _ Meta = &redisMeta{}
@@ -196,7 +196,7 @@ func newRedisMeta(driver, addr string, conf *Config) (Meta, error) {
 	}
 
 	m := &redisMeta{
-		baseMeta: newBaseMeta(conf),
+		baseMeta: newBaseMeta(addr, conf),
 		rdb:      rdb,
 		prefix:   prefix,
 	}
@@ -710,9 +710,6 @@ type timeoutError interface {
 }
 
 func (m *redisMeta) shouldRetry(err error, retryOnFailure bool) bool {
-	if _, ok := err.(syscall.Errno); ok {
-		return false
-	}
 	switch err {
 	case redis.TxFailedErr:
 		return true
@@ -767,7 +764,6 @@ func (m *redisMeta) txn(ctx Context, txf func(tx *redis.Tx) error, keys ...strin
 			panic(fmt.Sprintf("Invalid key %s not starts with prefix %s", k, m.prefix))
 		}
 	}
-	var err error
 	var khash = fnv.New32()
 	_, _ = khash.Write([]byte(keys[0]))
 	h := int(khash.Sum32())
@@ -777,21 +773,25 @@ func (m *redisMeta) txn(ctx Context, txf func(tx *redis.Tx) error, keys ...strin
 	defer m.txUnlock(h)
 	// TODO: enable retry for some of idempodent transactions
 	var retryOnFailture = false
+	var lastErr error
 	for i := 0; i < 50; i++ {
-		err = m.rdb.Watch(ctx, txf, keys...)
-		if m.shouldRetry(err, retryOnFailture) {
+		err := m.rdb.Watch(ctx, txf, keys...)
+		if eno, ok := err.(syscall.Errno); ok && eno == 0 {
+			err = nil
+		}
+		if err != nil && m.shouldRetry(err, retryOnFailture) {
 			txRestart.Add(1)
 			logger.Debugf("Transaction failed, restart it (tried %d): %s", i+1, err)
+			lastErr = err
 			time.Sleep(time.Millisecond * time.Duration(rand.Int()%((i+1)*(i+1))))
 			continue
-		}
-		if eno, ok := err.(syscall.Errno); ok && eno == 0 {
-			err = nil
+		} else if err == nil && i > 1 {
+			logger.Warnf("Transaction succeeded after %d tries (%s), keys: %v, last error: %s", i+1, time.Since(start), keys, lastErr)
 		}
 		return err
 	}
-	logger.Warnf("Already tried 50 times, returning: %s", err)
-	return err
+	logger.Warnf("Already tried 50 times, returning: %s", lastErr)
+	return lastErr
 }
 
 func (m *redisMeta) Truncate(ctx Context, inode Ino, flags uint8, length uint64, attr *Attr) syscall.Errno {
@@ -2867,259 +2867,246 @@ func (m *redisMeta) checkServerConfig() {
 	logger.Infof("Ping redis: %s", time.Since(start))
 }
 
-func (m *redisMeta) dumpEntry(inode Ino, typ uint8) (*DumpedEntry, error) {
-	ctx := Background
-	e := &DumpedEntry{}
-	return e, m.txn(ctx, func(tx *redis.Tx) error {
-		a, err := tx.Get(ctx, m.inodeKey(inode)).Bytes()
-		if err != nil {
-			if err != redis.Nil {
-				return err
-			}
-			logger.Warnf("The entry of the inode was not found. inode: %v", inode)
+var entryPool = sync.Pool{
+	New: func() interface{} {
+		return &DumpedEntry{
+			Attr: &DumpedAttr{},
 		}
-		attr := &Attr{Typ: typ, Nlink: 1}
-		m.parseAttr(a, attr)
-		e.Attr = dumpAttr(attr)
-		e.Attr.Inode = inode
+	},
+}
 
-		keys, err := tx.HGetAll(ctx, m.xattrKey(inode)).Result()
-		if err != nil {
+func (m *redisMeta) dumpEntries(es ...*DumpedEntry) error {
+	ctx := Background
+	var keys []string
+	for _, e := range es {
+		keys = append(keys, m.inodeKey(e.Attr.Inode))
+	}
+	return m.txn(ctx, func(tx *redis.Tx) error {
+		p := tx.Pipeline()
+		var ar = make([]*redis.StringCmd, len(es))
+		var xr = make([]*redis.StringStringMapCmd, len(es))
+		var sr = make([]*redis.StringCmd, len(es))
+		var cr = make([]*redis.StringSliceCmd, len(es))
+		var dr = make([]*redis.StringStringMapCmd, len(es))
+		for i, e := range es {
+			inode := e.Attr.Inode
+			ar[i] = p.Get(ctx, m.inodeKey(inode))
+			xr[i] = p.HGetAll(ctx, m.xattrKey(inode))
+			switch e.Attr.Type {
+			case "regular":
+				cr[i] = p.LRange(ctx, m.chunkKey(inode, 0), 0, 1000000)
+			case "directory":
+				dr[i] = p.HGetAll(ctx, m.entryKey(inode))
+			case "symlink":
+				sr[i] = p.Get(ctx, m.symKey(inode))
+			}
+		}
+		if _, err := p.Exec(ctx); err != nil {
 			return err
 		}
-		if len(keys) > 0 {
-			xattrs := make([]*DumpedXattr, 0, len(keys))
-			for k, v := range keys {
-				xattrs = append(xattrs, &DumpedXattr{k, v})
-			}
-			sort.Slice(xattrs, func(i, j int) bool { return xattrs[i].Name < xattrs[j].Name })
-			e.Xattrs = xattrs
-		}
 
-		if attr.Typ == TypeFile {
-			for indx := uint32(0); uint64(indx)*ChunkSize < attr.Length; indx++ {
-				vals, err := tx.LRange(ctx, m.chunkKey(inode, indx), 0, 1000000).Result()
-				if err != nil {
+		type lchunk struct {
+			inode Ino
+			indx  uint32
+			i     uint32
+		}
+		var lcs []*lchunk
+		for i, e := range es {
+			inode := e.Attr.Inode
+			typ := typeFromString(e.Attr.Type)
+			a, err := ar[i].Bytes()
+			if err != nil {
+				if err != redis.Nil {
 					return err
 				}
-				ss := readSlices(vals)
-				slices := make([]*DumpedSlice, 0, len(ss))
-				for _, s := range ss {
-					slices = append(slices, &DumpedSlice{Chunkid: s.chunkid, Pos: s.pos, Size: s.size, Off: s.off, Len: s.len})
+				logger.Warnf("The entry of the inode was not found. inode: %v", inode)
+			}
+
+			var attr Attr
+			attr.Typ = typ
+			attr.Nlink = 1
+			m.parseAttr(a, &attr)
+			if attr.Typ != typ {
+				e.Attr.Type = typeToString(attr.Typ)
+				return redis.TxFailedErr // retry
+			}
+			dumpAttr(&attr, e.Attr)
+
+			keys, err := xr[i].Result()
+			if err != nil {
+				return err
+			}
+			if len(keys) > 0 {
+				xattrs := make([]*DumpedXattr, 0, len(keys))
+				for k, v := range keys {
+					xattrs = append(xattrs, &DumpedXattr{k, v})
 				}
-				e.Chunks = append(e.Chunks, &DumpedChunk{indx, slices})
+				sort.Slice(xattrs, func(i, j int) bool { return xattrs[i].Name < xattrs[j].Name })
+				e.Xattrs = xattrs
 			}
-		} else if attr.Typ == TypeSymlink {
-			if e.Symlink, err = tx.Get(ctx, m.symKey(inode)).Result(); err != nil {
-				if err != redis.Nil {
+			switch typ {
+			case TypeFile:
+				if attr.Length > 0 {
+					vals, err := cr[i].Result()
+					if err != nil {
+						return err
+					}
+					if len(vals) > 0 {
+						ss := readSlices(vals)
+						slices := make([]*DumpedSlice, 0, len(ss))
+						for _, s := range ss {
+							slices = append(slices, &DumpedSlice{Chunkid: s.chunkid, Pos: s.pos, Size: s.size, Off: s.off, Len: s.len})
+						}
+						e.Chunks = append(e.Chunks, &DumpedChunk{0, slices})
+					}
+				}
+				if attr.Length > ChunkSize {
+					for indx := uint32(1); uint64(indx)*ChunkSize < attr.Length; indx++ {
+						lcs = append(lcs, &lchunk{inode, indx, uint32(i)})
+					}
+				}
+			case TypeDirectory:
+				dirs, err := dr[i].Result()
+				if err != nil {
 					return err
 				}
-				logger.Warnf("The symlink of inode %d is not found", inode)
+				e.Entries = make(map[string]*DumpedEntry)
+				for name := range dirs {
+					t, inode := m.parseEntry([]byte(dirs[name]))
+					ce := entryPool.Get().(*DumpedEntry)
+					ce.Attr.Inode = inode
+					ce.Attr.Type = typeToString(t)
+					e.Entries[name] = ce
+				}
+			case TypeSymlink:
+				if e.Symlink, err = sr[i].Result(); err != nil {
+					if err != redis.Nil {
+						return err
+					}
+					logger.Warnf("The symlink of inode %d is not found", inode)
+				}
 			}
 		}
-		return nil
-	}, m.inodeKey(inode))
-}
-
-func (m *redisMeta) dumpEntryFast(inode Ino, typ uint8) *DumpedEntry {
-	e := &DumpedEntry{}
-	a := []byte(m.snap.stringMap[m.inodeKey(inode)])
-	if len(a) == 0 {
-		if inode != TrashInode {
-			logger.Warnf("The entry of the inode was not found. inode: %v", inode)
-		}
-	}
-	attr := &Attr{Typ: typ, Nlink: 1}
-	m.parseAttr(a, attr)
-	e.Attr = dumpAttr(attr)
-	e.Attr.Inode = inode
 
-	keys := m.snap.hashMap[m.xattrKey(inode)]
-	if len(keys) > 0 {
-		xattrs := make([]*DumpedXattr, 0, len(keys))
-		for k, v := range keys {
-			xattrs = append(xattrs, &DumpedXattr{k, v})
-		}
-		sort.Slice(xattrs, func(i, j int) bool { return xattrs[i].Name < xattrs[j].Name })
-		e.Xattrs = xattrs
-	}
-
-	if attr.Typ == TypeFile {
-		for indx := uint32(0); uint64(indx)*ChunkSize < attr.Length; indx++ {
-			vals := m.snap.listMap[m.chunkKey(inode, indx)]
-			ss := readSlices(vals)
-			slices := make([]*DumpedSlice, 0, len(ss))
-			for _, s := range ss {
-				slices = append(slices, &DumpedSlice{Chunkid: s.chunkid, Pos: s.pos, Size: s.size, Off: s.off, Len: s.len})
+		cr = make([]*redis.StringSliceCmd, len(es)*3)
+		for len(lcs) > 0 {
+			if len(cr) > len(lcs) {
+				cr = cr[:len(lcs)]
 			}
-			e.Chunks = append(e.Chunks, &DumpedChunk{indx, slices})
-		}
-	} else if attr.Typ == TypeSymlink {
-		if m.snap.stringMap[m.symKey(inode)] == "" {
-			logger.Warnf("The symlink of inode %d is not found", inode)
+			for i := range cr {
+				c := lcs[i]
+				cr[i] = p.LRange(ctx, m.chunkKey(c.inode, c.indx), 0, 1000000)
+			}
+			if _, err := p.Exec(ctx); err != nil {
+				return err
+			}
+			for i := range cr {
+				vals, err := cr[i].Result()
+				if err != nil {
+					return err
+				}
+				if len(vals) > 0 {
+					ss := readSlices(vals)
+					slices := make([]*DumpedSlice, 0, len(ss))
+					for _, s := range ss {
+						slices = append(slices, &DumpedSlice{Chunkid: s.chunkid, Pos: s.pos, Size: s.size, Off: s.off, Len: s.len})
+					}
+					e := es[lcs[i].i]
+					e.Chunks = append(e.Chunks, &DumpedChunk{lcs[i].indx, slices})
+				}
+			}
+			lcs = lcs[len(cr):]
 		}
-		e.Symlink = m.snap.stringMap[m.symKey(inode)]
-	}
-	return e
+		return nil
+	}, keys...)
 }
 
-func (m *redisMeta) dumpDir(inode Ino, tree *DumpedEntry, bw *bufio.Writer, depth int, showProgress func(totalIncr, currentIncr int64)) error {
+func (m *redisMeta) dumpDir(inode Ino, tree *DumpedEntry, bw *bufio.Writer, depth int, bar *utils.Bar) error {
 	bwWrite := func(s string) {
 		if _, err := bw.WriteString(s); err != nil {
 			panic(err)
 		}
 	}
 	var err error
-	var dirs map[string]string
-	if m.snap != nil {
-		dirs = m.snap.hashMap[m.entryKey(inode)]
-	} else {
-		dirs, err = m.rdb.HGetAll(context.Background(), m.entryKey(inode)).Result()
-		if err != nil {
-			return err
-		}
-	}
-
-	if showProgress != nil {
-		showProgress(int64(len(dirs)), 0)
+	entries := make([]*DumpedEntry, 0, len(tree.Entries))
+	for name, e := range tree.Entries {
+		e.Name = name
+		entries = append(entries, e)
 	}
 	if err = tree.writeJsonWithOutEntry(bw, depth); err != nil {
 		return err
 	}
-	var sortedName []string
-	for name := range dirs {
-		sortedName = append(sortedName, name)
-	}
-	sort.Slice(sortedName, func(i, j int) bool { return sortedName[i] < sortedName[j] })
-	for idx, name := range sortedName {
-		typ, inode := m.parseEntry([]byte(dirs[name]))
-		var entry *DumpedEntry
-		if m.snap != nil {
-			entry = m.dumpEntryFast(inode, typ)
-		} else {
-			entry, err = m.dumpEntry(inode, typ)
-			if err != nil {
-				return err
-			}
-		}
-		if entry == nil {
-			continue
-		}
+	sort.Slice(entries, func(i, j int) bool { return entries[i].Name < entries[j].Name })
+	var concurrent = 2
+	var batch = 100
+	ms := make([]sync.Mutex, concurrent)
+	conds := make([]*sync.Cond, concurrent)
+	ready := make([]int, concurrent)
+	for c := 0; c < concurrent; c++ {
+		conds[c] = sync.NewCond(&ms[c])
+		if c*batch < len(entries) {
+			go func(c int) {
+				for i := c * batch; i < len(entries); i += concurrent * batch {
+					es := entries[i:]
+					if len(es) > batch {
+						es = es[:batch]
+					}
+					e := m.dumpEntries(es...)
+					ms[c].Lock()
+					ready[c] = len(es)
+					if e != nil {
+						err = e
+					}
+					conds[c].Signal()
+					ms[c].Unlock()
 
-		entry.Name = name
-		if typ == TypeDirectory {
-			err = m.dumpDir(inode, entry, bw, depth+2, showProgress)
-		} else {
-			err = entry.writeJSON(bw, depth+2)
-		}
-		if err != nil {
-			return err
-		}
-		if idx != len(sortedName)-1 {
-			bwWrite(",")
-		}
-		if showProgress != nil {
-			showProgress(0, 1)
+					ms[c].Lock()
+					for ready[c] > 0 {
+						conds[c].Wait()
+					}
+					ms[c].Unlock()
+				}
+			}(c)
 		}
 	}
-	bwWrite(fmt.Sprintf("\n%s}\n%s}", strings.Repeat(jsonIndent, depth+1), strings.Repeat(jsonIndent, depth)))
-	return nil
-}
-
-type redisSnap struct {
-	stringMap map[string]string            //i* s*
-	listMap   map[string][]string          //c*
-	hashMap   map[string]map[string]string //d*(included delfiles) x*
-}
-
-func (m *redisMeta) makeSnap(bar *utils.Bar) error {
-	m.snap = &redisSnap{
-		stringMap: make(map[string]string),
-		listMap:   make(map[string][]string),
-		hashMap:   make(map[string]map[string]string),
-	}
-	ctx := context.Background()
-
-	listType := func(keys []string) error {
-		p := m.rdb.Pipeline()
-		for _, key := range keys {
-			p.LRange(ctx, key, 0, -1)
+	for i, e := range entries {
+		b := i / batch
+		c := b % concurrent
+		ms[c].Lock()
+		for ready[c] == 0 {
+			conds[c].Wait()
 		}
-		cmds, err := p.Exec(ctx)
-		if err != nil {
-			return err
+		ready[c]--
+		if ready[c] == 0 {
+			conds[c].Signal()
 		}
-		for _, cmd := range cmds {
-			if sliceCmd, ok := cmd.(*redis.StringSliceCmd); ok {
-				if key, ok := cmd.Args()[1].(string); ok {
-					m.snap.listMap[key] = sliceCmd.Val()
-				}
-			}
-			bar.Increment()
-		}
-
-		return nil
-	}
-
-	stringType := func(keys []string) error {
-		values, err := m.rdb.MGet(ctx, keys...).Result()
+		ms[c].Unlock()
 		if err != nil {
 			return err
 		}
-		for i := 0; i < len(keys); i++ {
-			if s, ok := values[i].(string); ok {
-				m.snap.stringMap[keys[i]] = s
-			}
-			bar.Increment()
-		}
-		return nil
-	}
-
-	hashType := func(keys []string) error {
-		p := m.rdb.Pipeline()
-		for _, key := range keys {
-			if key == m.delfiles() {
-				continue
-			}
-			p.HGetAll(ctx, key)
-		}
-		cmds, err := p.Exec(ctx)
+		if e.Attr.Type == "directory" {
+			err = m.dumpDir(inode, e, bw, depth+2, bar)
+		} else {
+			err = e.writeJSON(bw, depth+2)
+		}
+		entries[i] = nil
+		delete(tree.Entries, e.Name)
+		e.Xattrs = nil
+		e.Chunks = nil
+		e.Entries = nil
+		e.Symlink = ""
+		entryPool.Put(e)
 		if err != nil {
 			return err
 		}
-		for _, cmd := range cmds {
-			if stringMapCmd, ok := cmd.(*redis.StringStringMapCmd); ok {
-				if key, ok := cmd.Args()[1].(string); ok {
-					m.snap.hashMap[key] = stringMapCmd.Val()
-				}
-			}
-			bar.Increment()
+		if i != len(entries)-1 {
+			bwWrite(",")
 		}
-		return nil
-	}
-
-	typeMap := map[string]func([]string) error{
-		"c*": listType,
-		"i*": stringType,
-		"s*": stringType,
-		"d*": hashType,
-		"x*": hashType,
-	}
-
-	scanner := func(match string, handlerKey func([]string) error) error {
-		return m.scan(ctx, match, func(keys []string) error {
-			if err := handlerKey(keys); err != nil {
-				return err
-			}
-			return nil
-		})
-	}
-
-	for match, typ := range typeMap {
-		if err := scanner(match, typ); err != nil {
-			return err
+		if bar != nil {
+			bar.IncrInt64(1)
 		}
 	}
+	bwWrite(fmt.Sprintf("\n%s}\n%s}", strings.Repeat(jsonIndent, depth+1), strings.Repeat(jsonIndent, depth)))
 	return nil
 }
 
@@ -3127,6 +3114,7 @@ func (m *redisMeta) DumpMeta(w io.Writer, root Ino) (err error) {
 	defer func() {
 		if p := recover(); p != nil {
 			if e, ok := p.(error); ok {
+				debug.PrintStack()
 				err = e
 			} else {
 				err = errors.Errorf("DumpMeta error: %v", p)
@@ -3150,28 +3138,6 @@ func (m *redisMeta) DumpMeta(w io.Writer, root Ino) (err error) {
 		dels = append(dels, &DumpedDelFile{Ino(inode), length, int64(z.Score)})
 	}
 
-	progress := utils.NewProgress(false, false)
-	var tree, trash *DumpedEntry
-	root = m.checkRoot(root)
-	if root == 1 {
-		defer func() { m.snap = nil }()
-		bar := progress.AddCountBar("Snapshot keys", m.rdb.DBSize(ctx).Val())
-		if err = m.makeSnap(bar); err != nil {
-			return errors.Errorf("Fetch all metadata from Redis: %s", err)
-		}
-		bar.Done()
-		tree = m.dumpEntryFast(root, TypeDirectory)
-		trash = m.dumpEntryFast(TrashInode, TypeDirectory)
-	} else {
-		if tree, err = m.dumpEntry(root, TypeDirectory); err != nil {
-			return err
-		}
-	}
-	if tree == nil {
-		return errors.New("The entry of the root inode was not found")
-	}
-	tree.Name = "FSTree"
-
 	names := []string{usedSpace, totalInodes, "nextinode", "nextchunk", "nextsession", "nextTrash"}
 	for i := range names {
 		names[i] = m.prefix + names[i]
@@ -3192,13 +3158,9 @@ func (m *redisMeta) DumpMeta(w io.Writer, root Ino) (err error) {
 	for _, k := range keys {
 		sid, _ := strconv.ParseUint(k, 10, 64)
 		var ss []string
-		if root == 1 {
-			ss = m.snap.listMap[m.sustained(sid)]
-		} else {
-			ss, err = m.rdb.SMembers(ctx, m.sustained(sid)).Result()
-			if err != nil {
-				return err
-			}
+		ss, err = m.rdb.SMembers(ctx, m.sustained(sid)).Result()
+		if err != nil {
+			return err
 		}
 		if len(ss) > 0 {
 			inodes := make([]Ino, 0, len(ss))
@@ -3232,25 +3194,38 @@ func (m *redisMeta) DumpMeta(w io.Writer, root Ino) (err error) {
 		return err
 	}
 
-	bar := progress.AddCountBar("Dumped entries", 1) // with root
-	bar.Increment()
-	if trash != nil {
-		trash.Name = "Trash"
-		bar.IncrTotal(1)
-		bar.Increment()
+	progress := utils.NewProgress(false, false)
+	bar := progress.AddCountBar("Dumped entries", dm.Counters.UsedInodes) // with root
+
+	root = m.checkRoot(root)
+	var tree = &DumpedEntry{
+		Name: "FSTree",
+		Attr: &DumpedAttr{
+			Inode: root,
+			Type:  typeToString(TypeDirectory),
+		},
 	}
-	showProgress := func(totalIncr, currentIncr int64) {
-		bar.IncrTotal(totalIncr)
-		bar.IncrInt64(currentIncr)
+	if err = m.dumpEntries(tree); err != nil {
+		return err
 	}
-	if err = m.dumpDir(root, tree, bw, 1, showProgress); err != nil {
+	if err = m.dumpDir(root, tree, bw, 1, bar); err != nil {
 		return err
 	}
-	if trash != nil {
+	if root == 1 {
+		trash := &DumpedEntry{
+			Name: "Trash",
+			Attr: &DumpedAttr{
+				Inode: TrashInode,
+				Type:  typeToString(TypeDirectory),
+			},
+		}
+		if err = m.dumpEntries(trash); err != nil {
+			return err
+		}
 		if _, err = bw.WriteString(","); err != nil {
 			return err
 		}
-		if err = m.dumpDir(TrashInode, trash, bw, 1, showProgress); err != nil {
+		if err = m.dumpDir(TrashInode, trash, bw, 1, bar); err != nil {
 			return err
 		}
 	}
@@ -3315,6 +3290,7 @@ func (m *redisMeta) loadEntry(e *DumpedEntry, p redis.Pipeliner, tryExec func())
 		p.HSet(ctx, m.xattrKey(inode), xattrs)
 	}
 	p.Set(ctx, m.inodeKey(inode), m.marshal(attr), 0)
+	tryExec()
 }
 
 func (m *redisMeta) LoadMeta(r io.Reader) (err error) {
@@ -3332,7 +3308,7 @@ func (m *redisMeta) LoadMeta(r io.Reader) (err error) {
 			return err
 		}
 		if dbsize > 0 {
-			return fmt.Errorf("Database %s is not empty", m.Name())
+			return fmt.Errorf("Database redis://%s is not empty", m.addr)
 		}
 	}
 
diff --git a/pkg/meta/sql.go b/pkg/meta/sql.go
index 7466e878..2975ecf5 100644
--- a/pkg/meta/sql.go
+++ b/pkg/meta/sql.go
@@ -201,7 +201,7 @@ func newSQLMeta(driver, addr string, conf *Config) (Meta, error) {
 	engine.DB().SetConnMaxIdleTime(time.Minute * 5)
 	engine.SetTableMapper(names.NewPrefixMapper(engine.GetTableMapper(), "jfs_"))
 	m := &dbMeta{
-		baseMeta: newBaseMeta(conf),
+		baseMeta: newBaseMeta(addr, conf),
 		db:       engine,
 	}
 	m.en = m
@@ -588,13 +588,6 @@ func mustInsert(s *xorm.Session, beans ...interface{}) error {
 var errBusy error
 
 func (m *dbMeta) shouldRetry(err error) bool {
-	if err == nil {
-		return false
-	}
-	if _, ok := err.(syscall.Errno); ok {
-		return false
-	}
-	// TODO: add other retryable errors here
 	msg := strings.ToLower(err.Error())
 	if strings.Contains(msg, "too many connections") || strings.Contains(msg, "too many clients") {
 		logger.Warnf("transaction failed: %s, will retry it. please increase the max number of connections in your database, or use a connection pool.", msg)
@@ -630,57 +623,64 @@ func (m *dbMeta) txn(f func(s *xorm.Session) error, inodes ...Ino) error {
 		m.txLock(int(inodes[0]))
 		defer m.txUnlock(int(inodes[0]))
 	}
-	var err error
+	var lastErr error
 	for i := 0; i < 50; i++ {
-		_, err = m.db.Transaction(func(s *xorm.Session) (interface{}, error) {
+		_, err := m.db.Transaction(func(s *xorm.Session) (interface{}, error) {
 			return nil, f(s)
 		})
 		if eno, ok := err.(syscall.Errno); ok && eno == 0 {
 			err = nil
 		}
-		if m.shouldRetry(err) {
+		if err != nil && m.shouldRetry(err) {
 			txRestart.Add(1)
 			logger.Debugf("Transaction failed, restart it (tried %d): %s", i+1, err)
+			lastErr = err
 			time.Sleep(time.Millisecond * time.Duration(i*i))
 			continue
+		} else if err == nil && i > 1 {
+			logger.Warnf("Transaction succeeded after %d tries (%s), inodes: %v, last error: %s", i+1, time.Since(start), inodes, lastErr)
 		}
 		return err
 	}
-	logger.Warnf("Already tried 50 times, returning: %s", err)
-	return err
+	logger.Warnf("Already tried 50 times, returning: %s", lastErr)
+	return lastErr
 }
 
 func (m *dbMeta) roTxn(f func(s *xorm.Session) error) error {
 	start := time.Now()
 	defer func() { txDist.Observe(time.Since(start).Seconds()) }()
-	var err error
 	s := m.db.NewSession()
 	defer s.Close()
 	var opt = sql.TxOptions{
 		Isolation: sql.LevelRepeatableRead,
 		ReadOnly:  true,
 	}
+	var lastErr error
 	for i := 0; i < 50; i++ {
 		if err := s.BeginTx(&opt); err != nil {
 			logger.Debugf("Start transaction failed, try again (tried %d): %s", i+1, err)
+			lastErr = err
 			time.Sleep(time.Millisecond * time.Duration(i*i))
 			continue
 		}
-		err = f(s)
+		err := f(s)
 		if eno, ok := err.(syscall.Errno); ok && eno == 0 {
 			err = nil
 		}
 		_ = s.Rollback()
-		if m.shouldRetry(err) {
+		if err != nil && m.shouldRetry(err) {
 			txRestart.Add(1)
-			logger.Debugf("Transaction failed, restart it (tried %d): %s", i+1, err)
+			logger.Debugf("Read transaction failed, restart it (tried %d): %s", i+1, err)
+			lastErr = err
 			time.Sleep(time.Millisecond * time.Duration(i*i))
 			continue
+		} else if err == nil && i > 1 {
+			logger.Warnf("Read transaction succeeded after %d tries (%s), last error: %s", i+1, time.Since(start), lastErr)
 		}
 		return err
 	}
-	logger.Warnf("Already tried 50 times, returning: %s", err)
-	return err
+	logger.Warnf("Already tried 50 times, returning: %s", lastErr)
+	return lastErr
 }
 
 func (m *dbMeta) parseAttr(n *node, attr *Attr) {
@@ -2605,7 +2605,8 @@ func (m *dbMeta) dumpEntry(s *xorm.Session, inode Ino, typ uint8) (*DumpedEntry,
 	} else {
 		m.parseAttr(n, attr)
 	}
-	e.Attr = dumpAttr(attr)
+	e.Attr = &DumpedAttr{}
+	dumpAttr(attr, e.Attr)
 	e.Attr.Inode = inode
 
 	var rows []xattr
@@ -2662,7 +2663,8 @@ func (m *dbMeta) dumpEntryFast(s *xorm.Session, inode Ino, typ uint8) *DumpedEnt
 
 	attr := &Attr{Typ: typ, Nlink: 1}
 	m.parseAttr(n, attr)
-	e.Attr = dumpAttr(attr)
+	e.Attr = &DumpedAttr{}
+	dumpAttr(attr, e.Attr)
 	e.Attr.Inode = inode
 
 	rows, ok := m.snap.xattr[inode]
@@ -3008,7 +3010,11 @@ func (m *dbMeta) LoadMeta(r io.Reader) error {
 		return err
 	}
 	if len(tables) > 0 {
-		return fmt.Errorf("Database %s is not empty", m.Name())
+		addr := m.addr
+		if !strings.Contains(addr, "://") {
+			addr = fmt.Sprintf("%s://%s", m.Name(), addr)
+		}
+		return fmt.Errorf("Database %s is not empty", addr)
 	}
 	if err = m.syncTable(new(setting), new(counter)); err != nil {
 		return fmt.Errorf("create table setting, counter: %s", err)
diff --git a/pkg/meta/tkv.go b/pkg/meta/tkv.go
index 4676161b..91f2fe64 100644
--- a/pkg/meta/tkv.go
+++ b/pkg/meta/tkv.go
@@ -84,7 +84,7 @@ func newKVMeta(driver, addr string, conf *Config) (Meta, error) {
 	// TODO: ping server and check latency > Millisecond
 	// logger.Warnf("The latency to database is too high: %s", time.Since(start))
 	m := &kvMeta{
-		baseMeta: newBaseMeta(conf),
+		baseMeta: newBaseMeta(addr, conf),
 		client:   client,
 	}
 	m.en = m
@@ -622,12 +622,6 @@ func (m *kvMeta) ListSessions() ([]*Session, error) {
 }
 
 func (m *kvMeta) shouldRetry(err error) bool {
-	if err == nil {
-		return false
-	}
-	if _, ok := err.(syscall.Errno); ok {
-		return false
-	}
 	return m.client.shouldRetry(err)
 }
 
@@ -641,21 +635,25 @@ func (m *kvMeta) txn(f func(tx kvTxn) error, inodes ...Ino) error {
 		m.txLock(int(inodes[0]))
 		defer m.txUnlock(int(inodes[0]))
 	}
-	var err error
+	var lastErr error
 	for i := 0; i < 50; i++ {
-		if err = m.client.txn(f); m.shouldRetry(err) {
+		err := m.client.txn(f)
+		if eno, ok := err.(syscall.Errno); ok && eno == 0 {
+			err = nil
+		}
+		if err != nil && m.shouldRetry(err) {
 			txRestart.Add(1)
 			logger.Debugf("Transaction failed, restart it (tried %d): %s", i+1, err)
+			lastErr = err
 			time.Sleep(time.Millisecond * time.Duration(rand.Int()%((i+1)*(i+1))))
 			continue
-		}
-		if eno, ok := err.(syscall.Errno); ok && eno == 0 {
-			err = nil
+		} else if err == nil && i > 1 {
+			logger.Warnf("Transaction succeeded after %d tries (%s), inodes: %v, error: %s", i+1, time.Since(start), inodes, lastErr)
 		}
 		return err
 	}
-	logger.Warnf("Already tried 50 times, returning: %s", err)
-	return err
+	logger.Warnf("Already tried 50 times, returning: %s", lastErr)
+	return lastErr
 }
 
 func (m *kvMeta) setValue(key, value []byte) error {
@@ -2247,7 +2245,7 @@ func (m *kvMeta) dumpEntry(inode Ino, e *DumpedEntry) error {
 		if a == nil && e.Attr != nil {
 			attr.Typ = typeFromString(e.Attr.Type)
 		}
-		e.Attr = dumpAttr(attr) // TODO: reduce memory allocation
+		dumpAttr(attr, e.Attr)
 		e.Attr.Inode = inode
 
 		vals := tx.scanValues(m.xattrKey(inode, ""), -1, nil)
@@ -2409,7 +2407,8 @@ func (m *kvMeta) DumpMeta(w io.Writer, root Ino) (err error) {
 				case 'I':
 					attr := &Attr{Nlink: 1}
 					m.parseAttr(value, attr)
-					e.Attr = dumpAttr(attr)
+					e.Attr = &DumpedAttr{}
+					dumpAttr(attr, e.Attr)
 					e.Attr.Inode = ino
 				case 'C':
 					indx := binary.BigEndian.Uint32(key[10:])
@@ -2451,7 +2450,12 @@ func (m *kvMeta) DumpMeta(w io.Writer, root Ino) (err error) {
 		tree = m.snap[root]
 		trash = m.snap[TrashInode]
 	} else {
-		tree = &DumpedEntry{}
+		tree = &DumpedEntry{
+			Attr: &DumpedAttr{
+				Inode: root,
+				Type:  "directory",
+			},
+		}
 		if err = m.dumpEntry(root, tree); err != nil {
 			return err
 		}
@@ -2601,7 +2605,7 @@ func (m *kvMeta) LoadMeta(r io.Reader) error {
 		return err
 	}
 	if exist {
-		return fmt.Errorf("Database %s is not empty", m.Name())
+		return fmt.Errorf("Database %s://%s is not empty", m.Name(), m.addr)
 	}
 
 	kv := make(chan *pair, 10000)
diff --git a/pkg/meta/utils.go b/pkg/meta/utils.go
index f928a394..efd059d8 100644
--- a/pkg/meta/utils.go
+++ b/pkg/meta/utils.go
@@ -285,7 +285,7 @@ func Remove(r Meta, ctx Context, parent Ino, name string) syscall.Errno {
 	if attr.Typ != TypeDirectory {
 		return r.Unlink(ctx, parent, name)
 	}
-	concurrent := make(chan int, 10)
+	concurrent := make(chan int, 50)
 	return emptyEntry(r, ctx, parent, name, inode, concurrent)
 }
 
diff --git a/pkg/object/sftp.go b/pkg/object/sftp.go
index c46324ef..8ae4eed6 100644
--- a/pkg/object/sftp.go
+++ b/pkg/object/sftp.go
@@ -462,6 +462,7 @@ func newSftp(endpoint, username, pass string) (ObjectStorage, error) {
 		auth = append(auth, ssh.KeyboardInteractive(SshInteractive))
 	}
 
+	var signers []ssh.Signer
 	if privateKeyPath := os.Getenv("SSH_PRIVATE_KEY_PATH"); privateKeyPath != "" {
 		key, err := ioutil.ReadFile(privateKeyPath)
 		if err != nil {
@@ -471,7 +472,7 @@ func newSftp(endpoint, username, pass string) (ObjectStorage, error) {
 		if err != nil {
 			return nil, fmt.Errorf("unable to parse private key, error: %v", err)
 		}
-		auth = append(auth, ssh.PublicKeys(signer))
+		signers = append(signers, signer)
 	} else {
 		home := filepath.Join(os.Getenv("HOME"), ".ssh")
 		var algo = []string{"rsa", "dsa", "ecdsa", "ecdsa_sk", "ed25519", "xmss"}
@@ -483,14 +484,13 @@ func newSftp(endpoint, username, pass string) (ObjectStorage, error) {
 			if err == nil {
 				signer, err := ssh.ParsePrivateKey(key)
 				if err == nil {
-					auth = append(auth, ssh.PublicKeys(signer))
+					signers = append(signers, signer)
 				} else {
 					logger.Debugf("load private key %s: %s", filepath.Join(home, "id_"+a), err)
 				}
 			}
 		}
 	}
-
 	socket := os.Getenv("SSH_AUTH_SOCK")
 	if socket != "" {
 		conn, err := net.Dial("unix", socket)
@@ -498,9 +498,17 @@ func newSftp(endpoint, username, pass string) (ObjectStorage, error) {
 			logger.Errorf("Failed to open SSH_AUTH_SOCK: %v", err)
 		} else {
 			agent := agent.NewClient(conn)
-			auth = append(auth, ssh.PublicKeysCallback(agent.Signers))
+			signer, err := agent.Signers()
+			if err != nil {
+				logger.Warnf("load signer from agent: %s", err)
+			} else {
+				signers = append(signers, signer...)
+			}
 		}
 	}
+	if len(signers) > 0 {
+		auth = append(auth, ssh.PublicKeys(signers...))
+	}
 
 	config := &ssh.ClientConfig{
 		User:            username,
diff --git a/pkg/sync/config.go b/pkg/sync/config.go
index 643876de..59f73833 100644
--- a/pkg/sync/config.go
+++ b/pkg/sync/config.go
@@ -47,11 +47,11 @@ type Config struct {
 }
 
 func NewConfigFromCli(c *cli.Context) *Config {
-	if c.IsSet("limits") && c.Int64("limits") < 0 {
-		logger.Fatal("The limits parameter must be a non-negative integer")
+	if c.IsSet("limit") && c.Int64("limit") < 0 {
+		logger.Fatal("limit should not be less than 0")
 	}
 
-	return &Config{
+	cfg := &Config{
 		Start:       c.String("start"),
 		End:         c.String("end"),
 		Threads:     c.Int("threads"),
@@ -75,4 +75,9 @@ func NewConfigFromCli(c *cli.Context) *Config {
 		CheckAll:    c.Bool("check-all"),
 		CheckNew:    c.Bool("check-new"),
 	}
+	if cfg.Threads <= 0 {
+		logger.Warnf("threads should be larger than 0, reset it to 1")
+		cfg.Threads = 1
+	}
+	return cfg
 }
diff --git a/pkg/sync/sync.go b/pkg/sync/sync.go
index 04210ffc..b18cebb3 100644
--- a/pkg/sync/sync.go
+++ b/pkg/sync/sync.go
@@ -603,7 +603,7 @@ func deleteFromDst(tasks chan<- object.Object, dstobj object.Object, config *Con
 		logger.Debug("Ignore deleting dst directory ", dstobj.Key())
 		return false
 	}
-	if config.Limit != -1 {
+	if config.Limit >= 0 {
 		if config.Limit == 0 {
 			return true
 		}
@@ -660,7 +660,7 @@ func produce(tasks chan<- object.Object, src, dst object.ObjectStorage, srckeys,
 			logger.Debug("Ignore directory ", obj.Key())
 			continue
 		}
-		if config.Limit != -1 {
+		if config.Limit >= 0 {
 			if config.Limit == 0 {
 				return
 			}
diff --git a/pkg/utils/utils.go b/pkg/utils/utils.go
index b9fe7731..ec418fa0 100644
--- a/pkg/utils/utils.go
+++ b/pkg/utils/utils.go
@@ -84,12 +84,15 @@ func RemovePassword(uri string) string {
 	if p < 0 {
 		return uri
 	}
-	sp := strings.Index(uri, "://")
-	cp := strings.Index(uri[sp+3:], ":")
-	if cp < 0 || sp+3+cp > p {
+	sp := strings.Index(uri, "://") + 3
+	if sp == 2 {
+		sp = 0
+	}
+	cp := strings.Index(uri[sp:], ":")
+	if cp < 0 || sp+cp > p {
 		return uri
 	}
-	return uri[:sp+3+cp] + ":****" + uri[p:]
+	return uri[:sp+cp] + ":****" + uri[p:]
 }
 
 func GuessMimeType(key string) string {
diff --git a/pkg/vfs/internal.go b/pkg/vfs/internal.go
index 5a44d98a..e6677f17 100644
--- a/pkg/vfs/internal.go
+++ b/pkg/vfs/internal.go
@@ -184,6 +184,18 @@ func (v *VFS) handleInternalMsg(ctx Context, cmd uint32, r *utils.Buffer) []byte
 		fmt.Fprintf(w, " dirs:\t%d\n", summary.Dirs)
 		fmt.Fprintf(w, " length:\t%d\n", summary.Length)
 		fmt.Fprintf(w, " size:\t%d\n", summary.Size)
+		ps := meta.GetPaths(v.Meta, ctx, inode)
+		switch len(ps) {
+		case 0:
+			fmt.Fprintf(w, " path:\t%s\n", "unknown")
+		case 1:
+			fmt.Fprintf(w, " path:\t%s\n", ps[0])
+		default:
+			fmt.Fprintf(w, " paths:\n")
+			for _, p := range ps {
+				fmt.Fprintf(w, "\t%s\n", p)
+			}
+		}
 
 		if summary.Files == 1 && summary.Dirs == 0 {
 			fmt.Fprintf(w, " chunks:\n")
diff --git a/sdk/java/src/main/java/io/juicefs/JuiceFileSystemImpl.java b/sdk/java/src/main/java/io/juicefs/JuiceFileSystemImpl.java
index d887a663..6b27b086 100644
--- a/sdk/java/src/main/java/io/juicefs/JuiceFileSystemImpl.java
+++ b/sdk/java/src/main/java/io/juicefs/JuiceFileSystemImpl.java
@@ -52,7 +52,6 @@ import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
 import java.net.*;
 import java.nio.ByteBuffer;
-import java.nio.file.AccessDeniedException;
 import java.nio.file.Files;
 import java.nio.file.StandardCopyOption;
 import java.util.*;
@@ -569,7 +568,7 @@ public class JuiceFileSystemImpl extends FileSystem {
             File org = new File(dir, name);
             Files.move(tmp.toPath(), org.toPath(), StandardCopyOption.ATOMIC_MOVE);
             libFile = org;
-          } catch (AccessDeniedException ade) {
+          } catch (Exception ade) {
             Files.move(tmp.toPath(), libFile.toPath(), StandardCopyOption.ATOMIC_MOVE);
           }
         }


Test patch:
diff --git a/.github/workflows/aitests.yml b/.github/workflows/aitests.yml
index e84cbfe5..d4fd9f14 100644
--- a/.github/workflows/aitests.yml
+++ b/.github/workflows/aitests.yml
@@ -76,7 +76,7 @@ jobs:
           cd /jfs/
           git clone https://github.com/sanwan/SVHNClassifier
           cd SVHNClassifier
-          git checkout c06b126
+          git checkout 3429204
           mkdir data
           cd data
           wget -O train.tar.gz -nv http://ufldl.stanford.edu/housenumbers/train.tar.gz
@@ -95,7 +95,6 @@ jobs:
           time python convert_to_tfrecords.py --data_dir ./data >img.log
           sudo chmod 777 /var/jfsCache/
           cd /var/jfsCache/
-          sudo du -sh
           df -lh
 
 
@@ -104,7 +103,6 @@ jobs:
           cd /jfs/SVHNClassifier/
           time python train.py --data_dir ./data --train_logdir ./logs/train
           cd /var/jfsCache/
-          sudo du -sh
           df -lh
 
       - name: Evaluate
@@ -112,7 +110,6 @@ jobs:
           cd /jfs/SVHNClassifier/
           time python eval.py --data_dir ./data --checkpoint_dir ./logs/train --eval_logdir ./logs/eval
           cd /var/jfsCache/
-          sudo du -sh
           df -lh
 
       - name: Send Slack Notification
diff --git a/.github/workflows/aitests_limitcache.yml b/.github/workflows/aitests_limitcache.yml
index e46be537..891c51b9 100644
--- a/.github/workflows/aitests_limitcache.yml
+++ b/.github/workflows/aitests_limitcache.yml
@@ -77,7 +77,7 @@ jobs:
           cd /jfs/
           git clone https://github.com/sanwan/SVHNClassifier
           cd SVHNClassifier
-          git checkout c06b126
+          git checkout 3429204
           mkdir data
           cd data
           wget -O train.tar.gz -nv http://ufldl.stanford.edu/housenumbers/train.tar.gz
@@ -96,7 +96,6 @@ jobs:
           time python convert_to_tfrecords.py --data_dir ./data >img.log
           sudo chmod 777 /var/jfsCache/
           cd /var/jfsCache/
-          sudo du -sh
           df -lh
 
 
@@ -105,7 +104,6 @@ jobs:
           cd /jfs/SVHNClassifier/
           time python train.py --data_dir ./data --train_logdir ./logs/train
           cd /var/jfsCache/
-          sudo du -sh
           df -lh
 
 
@@ -114,7 +112,6 @@ jobs:
           cd /jfs/SVHNClassifier/
           time python eval.py --data_dir ./data --checkpoint_dir ./logs/train --eval_logdir ./logs/eval
           cd /var/jfsCache/
-          sudo du -sh
           df -lh
 
 
diff --git a/cmd/info_test.go b/cmd/info_test.go
index b9de4250..12fb3fd5 100644
--- a/cmd/info_test.go
+++ b/cmd/info_test.go
@@ -61,7 +61,7 @@ func TestInfo(t *testing.T) {
 			}
 			replacer := strings.NewReplacer("\n", "", " ", "")
 			res := replacer.Replace(string(content))
-			answer := fmt.Sprintf("%s/dir1: inode: 2 files:	10 dirs:	1 length:	40 size:	45056", testMountPoint)
+			answer := fmt.Sprintf("%s/dir1: inode: 2 files:	10 dirs:	1 length:	40 size:	45056 path:	/dir1", testMountPoint)
 			answer = replacer.Replace(answer)
 			So(res, ShouldEqual, answer)
 		})
diff --git a/cmd/mdtest.go b/cmd/mdtest.go
index b184da06..b75e7448 100644
--- a/cmd/mdtest.go
+++ b/cmd/mdtest.go
@@ -38,6 +38,7 @@ func createDir(jfs *fs.FileSystem, root string, d int, width int) error {
 }
 
 func createFile(jfs *fs.FileSystem, bar *utils.Bar, np int, root string, d int, width, files, bytes int) error {
+	m := jfs.Meta()
 	for i := 0; i < files; i++ {
 		fn := filepath.Join(root, fmt.Sprintf("file.mdtest.%d.%d", np, i))
 		f, err := jfs.Create(ctx, fn, 0644)
@@ -45,13 +46,18 @@ func createFile(jfs *fs.FileSystem, bar *utils.Bar, np int, root string, d int,
 			return fmt.Errorf("create %s: %s", fn, err)
 		}
 		if bytes > 0 {
-			m := jfs.Meta()
-			var chunkid uint64
-			if st := m.NewChunk(ctx, &chunkid); st != 0 {
-				return fmt.Errorf("writechunk %s: %s", fn, st)
-			}
-			if st := m.Write(ctx, f.Inode(), 0, 0, meta.Slice{Chunkid: chunkid, Size: uint32(bytes), Len: uint32(bytes)}); st != 0 {
-				return fmt.Errorf("writeend %s: %s", fn, st)
+			for indx := 0; indx*meta.ChunkSize < bytes; indx++ {
+				var chunkid uint64
+				if st := m.NewChunk(ctx, &chunkid); st != 0 {
+					return fmt.Errorf("writechunk %s: %s", fn, st)
+				}
+				size := meta.ChunkSize
+				if bytes < (indx+1)*meta.ChunkSize {
+					size = bytes - indx*meta.ChunkSize
+				}
+				if st := m.Write(ctx, f.Inode(), uint32(indx), 0, meta.Slice{Chunkid: chunkid, Size: uint32(size), Len: uint32(size)}); st != 0 {
+					return fmt.Errorf("writeend %s: %s", fn, st)
+				}
 			}
 		}
 		f.Close(ctx)
diff --git a/pkg/meta/base_test.go b/pkg/meta/base_test.go
index 1d383b91..36836e65 100644
--- a/pkg/meta/base_test.go
+++ b/pkg/meta/base_test.go
@@ -749,11 +749,11 @@ func testRemove(t *testing.T, m Meta) {
 	if st := m.Create(ctx, parent, "f", 0644, 0, 0, &inode, attr); st != 0 {
 		t.Fatalf("create d/f: %s", st)
 	}
-	if p, st := GetPath(m, ctx, parent); st != 0 || p != "/d" {
-		t.Fatalf("get path /d: %s, %s", st, p)
+	if ps := GetPaths(m, ctx, parent); len(ps) == 0 || ps[0] != "/d" {
+		t.Fatalf("get path /d: %v", ps)
 	}
-	if p, st := GetPath(m, ctx, inode); st != 0 || p != "/d/f" {
-		t.Fatalf("get path /d/f: %s, %s", st, p)
+	if ps := GetPaths(m, ctx, inode); len(ps) == 0 || ps[0] != "/d/f" {
+		t.Fatalf("get path /d/f: %v", ps)
 	}
 	for i := 0; i < 4096; i++ {
 		if st := m.Create(ctx, 1, "f"+strconv.Itoa(i), 0644, 0, 0, &inode, attr); st != 0 {