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https://issues.apache.org/jira/browse/HBASE-4727?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13143823#comment-13143823
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ramkrishna.s.vasudevan commented on HBASE-4727:
-----------------------------------------------

@Madhuwanti
Could you pls take a look at HBASE-4540.  I think that solves your problem.. If 
am wrong you can let me know.
                
> Don't unconditionally delete UNASSIGNED ZNode for a region.
> -----------------------------------------------------------
>
>                 Key: HBASE-4727
>                 URL: https://issues.apache.org/jira/browse/HBASE-4727
>             Project: HBase
>          Issue Type: Bug
>          Components: master
>    Affects Versions: 0.89.20100924
>            Reporter: Madhuwanti Vaidya
>            Assignee: Madhuwanti Vaidya
>            Priority: Minor
>
> Unconditionally deleting an UNASSIGNED ZNode when master processes 
> RS2ZK_REGION_OPENED (from the toDo queue) for a region has caused multiply 
> assigned regions or unassigned regions. One proposed fix is to check whether 
> the ZNode is actually in the state RS2ZK_REGION_OPENED before deleting it. 
> Another fix is to not delete the ZNode at all.

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