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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-11405) Multiple invocations of hbck in parallel disables balancer permanently
Date Wed, 17 Sep 2014 22:42:34 GMT

    [ https://issues.apache.org/jira/browse/HBASE-11405?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14138139#comment-14138139
] 

Hudson commented on HBASE-11405:
--------------------------------

FAILURE: Integrated in HBase-TRUNK #5519 (See [https://builds.apache.org/job/HBase-TRUNK/5519/])
HBASE-11405 Multiple invocations of hbck in parallel disables balancer permanently (Bharath
Vissapragada) (jmhsieh: rev f4ecb1816b170e28d9afc96c137c9086222be456)
* hbase-server/src/test/java/org/apache/hadoop/hbase/util/TestHBaseFsck.java
* hbase-server/src/main/java/org/apache/hadoop/hbase/util/HBaseFsck.java
Revert "HBASE-11405 Multiple invocations of hbck in parallel disables balancer permanently
(Bharath Vissapragada)" (jmhsieh: rev 2e4218648ade93f6a0172c1d807f63b702064804)
* hbase-server/src/test/java/org/apache/hadoop/hbase/util/TestHBaseFsck.java
* hbase-server/src/main/java/org/apache/hadoop/hbase/util/HBaseFsck.java


> Multiple invocations of hbck in parallel disables balancer permanently 
> -----------------------------------------------------------------------
>
>                 Key: HBASE-11405
>                 URL: https://issues.apache.org/jira/browse/HBASE-11405
>             Project: HBase
>          Issue Type: Bug
>          Components: Balancer, hbck
>    Affects Versions: 0.99.0
>            Reporter: bharath v
>            Assignee: bharath v
>             Fix For: 2.0.0, 0.99.1
>
>         Attachments: 11405-v3.txt, 11405-v5.patch, 11405-v6.patch, HBASE-11405-trunk-rebased.patch,
HBASE-11405-trunk.patch, HBASE-11405-trunk.patch.1, hbase-11405.rebase.140911.patch
>
>
> This is because of the following piece of code in hbck
> {code:borderStyle=solid}
>   boolean oldBalancer = admin.setBalancerRunning(false, true);
>     try {
>       onlineConsistencyRepair();
>     }
>     finally {
>       admin.setBalancerRunning(oldBalancer, false);
>     }
> {code}
> Newer invocations set oldBalancer to false as it was disabled by previous invocations
and this disables balancer permanently unless its manually turned on by the user. Easy to
reproduce, just run hbck 100 times in a loop in 2 different sessions and you can see that
balancer is set to false in the HMaster logs.



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