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https://issues.apache.org/jira/browse/HBASE-2700?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12882387#action_12882387
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Jonathan Gray commented on HBASE-2700:
--------------------------------------

bq. I don't have specifics. Past experience would have it that there'll likely 
be holes or transition modes we didn't consider.

Those would be implementation bugs, not design bugs.  In either case, whether 
we use zk just for transitions or also for failover, these bugs would need to 
be fixed.

> Handle master failover for regions in transition
> ------------------------------------------------
>
>                 Key: HBASE-2700
>                 URL: https://issues.apache.org/jira/browse/HBASE-2700
>             Project: HBase
>          Issue Type: Sub-task
>          Components: master, zookeeper
>            Reporter: Jonathan Gray
>            Priority: Critical
>             Fix For: 0.21.0
>
>
> To this point in HBASE-2692 tasks we have moved everything for regions in 
> transition into ZK, but we have not fully handled the master failover case.  
> This is to deal with that and to write tests for it.

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