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From "Jonathan Hsieh (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-11405) Multiple invocations of hbck in parallel disables balancer permanently
Date Fri, 19 Sep 2014 02:10:34 GMT

    [ https://issues.apache.org/jira/browse/HBASE-11405?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14139872#comment-14139872
] 

Jonathan Hsieh commented on HBASE-11405:
----------------------------------------

I've reverted this from branch-1 for the time being.  

Reminder,  please test before committing to branches!

> 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
>
>         Attachments: 11405-v3.txt, 11405-v5.patch, 11405-v6.patch, 11405v7.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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