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From "bharath v (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-11405) Multiple invocations of hbck in parallel disables balancer permanently
Date Mon, 15 Sep 2014 15:28:34 GMT

    [ https://issues.apache.org/jira/browse/HBASE-11405?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14134008#comment-14134008
] 

bharath v commented on HBASE-11405:
-----------------------------------

I believe the issue with failing tests is probably because surefire is running tests in parallel
(which is stopping parallel hbcks since they are all using the same cluster object). If I
run the failed tests individually, they pass. There is a mvn profile "nonParallelTests" but
it doesn't work for me either. Any ideas?

> 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
>         Attachments: 11405-v3.txt, 11405-v5.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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