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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-11405) Multiple invocations of hbck in parallel disables balancer permanently
Date Wed, 02 Jul 2014 16:37:25 GMT

    [ https://issues.apache.org/jira/browse/HBASE-11405?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14050296#comment-14050296
] 

Ted Yu commented on HBASE-11405:
--------------------------------

If the return value from mkdirs() is false, directory isn't created successfully.
See javadoc of mkdirs():
{code}
   * @return true if the directory creation succeeds; false otherwise
   * @throws IOException
   */
  public static boolean mkdirs(FileSystem fs, Path dir, FsPermission permission)
{code}

> 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
>         Attachments: HBASE-11405-trunk.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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