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https://issues.apache.org/jira/browse/HBASE-4951?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13168051#comment-13168051
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xufeng commented on HBASE-4951:
-------------------------------

I tested this patch in 0.90.
It can not work in following scenarios:
1.master startup,one regionserver startup.
2.waitForRegionServers over and ok.
3.run the bin/hbase master stop before root region be assigned.

the bin/hbase master stop will stop the cluster,the regionserver will  been 
killed first.
The root region has no chance to be assigned successfully,it will block in 
catalogTracker.waitForRoot().
                
> master process can not be stopped when it is initializing
> ---------------------------------------------------------
>
>                 Key: HBASE-4951
>                 URL: https://issues.apache.org/jira/browse/HBASE-4951
>             Project: HBase
>          Issue Type: Bug
>          Components: master
>    Affects Versions: 0.90.3
>            Reporter: xufeng
>            Assignee: ramkrishna.s.vasudevan
>            Priority: Critical
>             Fix For: 0.90.6
>
>         Attachments: HBASE-4951.patch
>
>
> It is easy to reproduce by following step:
> step1:start master process.(do not start regionserver process in the cluster).
> the master will wait the regionserver to check in:
> org.apache.hadoop.hbase.master.ServerManager: Waiting on regionserver(s) to 
> checkin
> step2:stop the master by sh command bin/hbase master stop
> result:the master process will never die because catalogTracker.waitForRoot() 
> method will block unitl the root region assigned.

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