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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-11405) Multiple invocations of hbck in parallel disables balancer permanently
Date Fri, 22 Aug 2014 14:10:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-11405?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14106869#comment-14106869
] 

Hadoop QA commented on HBASE-11405:
-----------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12663629/HBASE-11405-trunk-rebased.patch
  against trunk revision .
  ATTACHMENT ID: 12663629

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:green}+1 tests included{color}.  The patch appears to include 3 new or modified
tests.

    {color:red}-1 patch{color}.  The patch command could not apply the patch.

Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/10533//console

This message is automatically generated.

> 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: HBASE-11405-trunk-rebased.patch, HBASE-11405-trunk.patch, HBASE-11405-trunk.patch.1
>
>
> 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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