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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Reopened] (HBASE-11405) Multiple invocations of hbck in parallel disables balancer permanently
Date Sat, 20 Sep 2014 00:09:34 GMT

     [ https://issues.apache.org/jira/browse/HBASE-11405?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Andrew Purtell reopened HBASE-11405:
------------------------------------

> 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, 0.98.7, 0.94.24, 0.99.1
>
>         Attachments: 11405-1.0.txt, 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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