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https://issues.apache.org/jira/browse/HBASE-5677?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13252057#comment-13252057
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Lars Hofhansl commented on HBASE-5677:
--------------------------------------

Sigh... I think these are test-related issues. In a real cluster the Master is 
useless unless initialized (although I wouldn't know if that holds for a backup 
master as well).
I'll have a look at these when I get a chance.
                
> The master never does balance because duplicate openhandled the one region
> --------------------------------------------------------------------------
>
>                 Key: HBASE-5677
>                 URL: https://issues.apache.org/jira/browse/HBASE-5677
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.90.6
>         Environment: 0.90
>            Reporter: xufeng
>            Assignee: xufeng
>             Fix For: 0.90.7, 0.92.2, 0.94.0, 0.96.0
>
>         Attachments: 5677-proposal.txt, HBASE-5677-90-v1.patch, 
> surefire-report_no_patched_v1.html, surefire-report_patched_v1.html
>
>
> If region be assigned When the master is doing initialization(before do 
> processFailover),the region will be duplicate openhandled.
> because the unassigned node in zookeeper will be handled again in 
> AssignmentManager#processFailover()
> it cause the region in RIT,thus the master never does balance.

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