速記:
Hbase web UI 發現某Region長期處於如下狀態:
app_user_isnew,02,1517807389209.3eb41df715cdd0f9a2b0ce6550b586b3. state=PENDING_OPEN, ts=Wed Mar 14 21:22:10 CST 2018 (396447s ago), server=yq-hadoop184132,60020,1520836279511
Regions in Transition,沒錯,出現了RIT。
執行 hbase hbck 命令檢查:
ERROR: Region { meta => app_user_isnew,02,1517807389209.3eb41df715cdd0f9a2b0ce6550b586b3., hdfs => hdfs://yq-hadoop19:8020/hbase/data/default/app_user_isnew/3eb41df715cdd0f9a2b0ce6550b586b3, deployed => , replicaId => 0 } not deployed on any region server.
18/03/19 11:40:08 INFO util.HBaseFsck: Handling overlap merges in parallel. set hbasefsck.overlap.merge.parallel to false to run serially.
ERROR: There is a hole in the region chain between 02 and 03. You need to create a new .regioninfo and region dir in hdfs to plug the hole.
ERROR: Found inconsistency in table app_user_isnew
檢查結果顯示,該表存在一個 空洞 問題,我們定位到如下分區:
| app_user_isnew,02,1517807389209.3eb41df715cdd0f9a2b0ce6550b586b3. | yq-hadoop184140:60020| 02 | 03 |
檢查Hbase元數據,元數據是存在的,如下:
hbase(main):053:0> get'hbase:meta','app_user_isnew,02,1517807389209.3eb41df715cdd0f9a2b0ce6550b586b3.'
COLUMN CELL
info:regioninfo timestamp=1517807391090, value={ENCODED => 3eb41df715cdd0f9a2b0ce6550b586b3, NAME => 'app_user_isnew,02,1517807389209.3eb41df715cdd0f9a2b0ce6550b586b3.', STARTKEY => '02', ENDKEY => '03'}
info:seqnumDuringOpen timestamp=1520449077356, value=\x00\x00\x00\x00\x00\x00\x00\x13
info:server timestamp=1520449077356, value=yq-hadoop184140:60020
info:serverstartcode timestamp=1520449077356, value=1520214106665
4 row(s) in 0.0070 seconds
檢查HDFS目錄文件,發現.regioninfo文件也是存在的,如下:
$ hdfs dfs -ls /hbase/data/default/app_user_isnew/3eb41df715cdd0f9a2b0ce6550b586b3
Found 3 items
-rw-r--r-- 3 hbase hbase 53 2018-02-05 13:09 /hbase/data/default/app_user_isnew/3eb41df715cdd0f9a2b0ce6550b586b3/.regioninfo
drwxr-xr-x - hbase hbase 0 2018-02-05 13:09 /hbase/data/default/app_user_isnew/3eb41df715cdd0f9a2b0ce6550b586b3/f1
drwxr-xr-x - hbase hbase 0 2018-03-08 02:57 /hbase/data/default/app_user_isnew/3eb41df715cdd0f9a2b0ce6550b586b3/recovered.edits
既然元數據表和HDFS目錄中都有,那應該是該region註冊的問題,我們執行以下命令:
hbase hbck -fixAssignments
此命令用於修復未分配,錯誤分配或者多次分配Region的問題。
執行結果如下:
# hbase hbck -fixAssignments
18/03/19 14:14:19 INFO Configuration.deprecation: fs.default.name is deprecated. Instead, use fs.defaultFS
HBaseFsck command line options: -fixAssignments
18/03/19 14:14:19 WARN util.HBaseFsck: Got AccessDeniedException when preCheckPermission
org.apache.hadoop.hbase.security.AccessDeniedException: Permission denied: action=WRITE path=hdfs://yq-hadoop19:8020/hbase/.hbase-snapshot user=hdfs
at org.apache.hadoop.hbase.util.FSUtils.checkAccess(FSUtils.java:1797)
at org.apache.hadoop.hbase.util.HBaseFsck.preCheckPermission(HBaseFsck.java:1929)
at org.apache.hadoop.hbase.util.HBaseFsck.exec(HBaseFsck.java:4731)
at org.apache.hadoop.hbase.util.HBaseFsck$HBaseFsckTool.run(HBaseFsck.java:4559)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:84)
at org.apache.hadoop.hbase.util.HBaseFsck.main(HBaseFsck.java:4547)
Current user hdfs does not have write perms to hdfs://yq-hadoop19:8020/hbase/.hbase-snapshot. Please rerun hbck as hdfs user hbase
錯誤顯示我們應該使用hbase用戶執行該命令,使用hbase用戶執行。
sudo -u hbase hbase hbck -fixAssignments
執行後結果: 0 inconsistencies detected. Status: OK
解決!
參考文獻
1. hbase 修復 hbck: http://www.cnblogs.com/xjh713/p/6913042.html
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