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From "Zhou wenjian (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6537) Balancer compete with disable table will lead to cluster inconsistent
Date Fri, 10 Aug 2012 02:12:30 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6537?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13432485#comment-13432485
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Zhou wenjian commented on HBASE-6537:
-------------------------------------

@rajeshbabu
thanks for your reply.

agree with you, checking whether table is in disabling and disabled also in case of NotServingRegionException
will prevent from the issue too.

There is no problem in trunk because of it handling well in such scenario, but since we will
check table state both disabling and disabled, patch for trunk is also applicable
                
> Balancer compete with disable table will lead to cluster inconsistent 
> ----------------------------------------------------------------------
>
>                 Key: HBASE-6537
>                 URL: https://issues.apache.org/jira/browse/HBASE-6537
>             Project: HBase
>          Issue Type: Bug
>          Components: master
>    Affects Versions: 0.94.0
>            Reporter: Zhou wenjian
>             Fix For: 0.94.2
>
>         Attachments: HBASE-6537-94.patch
>
>
> Appear in 94. trunk is ok for the issue
> Balancer will collect the regionplans to move(unassign and then assign).
> before unassign, disable table appears, 
> after close the region in rs, master will delete the znode, romove region from RIT,
> and then clean the region from the online regions.
> During romoving region from RIT and cleaning out the region from the online regions.

> balancer begins to unassign, it will get a NotServingRegionException and if the table
is disabling, it will deal with the state in master and delete the znode . However the table
is disabled now, so the RIT and znode will remain. TimeoutMonitor draws a blank on it.
> It will hold back enabling the table or balancer unless restart

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