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https://issues.apache.org/jira/browse/HBASE-12480?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14215430#comment-14215430
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Jimmy Xiang commented on HBASE-12480:
-------------------------------------

bq. Passing null to ConcurrentMap.keySet().contains() will throw NPE
Right. OK.

bq. Hmm, will make the change. My initial thinking was that we need to make 
blocking calls but that doesn't seem to matter.
May not use invokeUnAssign directly.  It's better to do it asynchronously.

> Regions in FAILED_OPEN/FAILED_CLOSE should be processed on master failover 
> ---------------------------------------------------------------------------
>
>                 Key: HBASE-12480
>                 URL: https://issues.apache.org/jira/browse/HBASE-12480
>             Project: HBase
>          Issue Type: Bug
>          Components: Region Assignment
>            Reporter: Virag Kothari
>            Assignee: Virag Kothari
>             Fix For: 2.0.0, 0.98.9, 0.99.2
>
>         Attachments: HBASE-12480.patch
>
>
> For zk assignment, we used to process this regions. For zk less assignment, 
> we should do the same



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