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https://issues.apache.org/jira/browse/HBASE-4749?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13144107#comment-13144107
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stack commented on HBASE-4749:
------------------------------

Nice work Jinchao.  I think you've pinpointed the root issue.

The registration of regionservers by the master of regionservers that have not 
heartbeated the master but that still have an ephemeral node up in zk looks 
dangerous.  It was added by hbase-1502, by me, where I purged 
master/regionserver control via heartbeats.

I think we need to remove this bit of code.  Looking....
                
> TestMasterFailover case occasional fails
> ----------------------------------------
>
>                 Key: HBASE-4749
>                 URL: https://issues.apache.org/jira/browse/HBASE-4749
>             Project: HBase
>          Issue Type: Bug
>          Components: test
>    Affects Versions: 0.92.0
>            Reporter: gaojinchao
>            Priority: Minor
>             Fix For: 0.92.0
>
>
> look this logs:
> https://builds.apache.org/view/G-L/view/HBase/job/HBase-0.92/105/testReport/org.apache.hadoop.hbase.master/TestMasterFailover/testMasterFailoverWithMockedRITOnDeadRS/

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