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https://issues.apache.org/jira/browse/HBASE-5116?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13179171#comment-13179171
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stack commented on HBASE-5116:
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bq. The idea is to get the regions corresponding to an RS in the the META and 
compare the regions online in the RS. Remove those regions from the online list 
if they dont match.

When would this happen?  On open or every time we open new region?

Using .META. only to figure cluster state is insufficient?  Don't we need to 
consult zk state too?

Is doing this per regionserver is duplicating state-keeping done by the master?

How about we work on a unit test first Ram that shows the double-assign?  I'd 
be interested in helping out w/ this.
                
> Remove double assignment of regions
> -----------------------------------
>
>                 Key: HBASE-5116
>                 URL: https://issues.apache.org/jira/browse/HBASE-5116
>             Project: HBase
>          Issue Type: Bug
>            Reporter: ramkrishna.s.vasudevan
>            Assignee: ramkrishna.s.vasudevan
>
> As part of HBASE-5094 we found the possibility of doubly assignments of 
> regions.  This JIRA is to avoid such double assignments.
> The idea is to get the regions corresponding to an RS in the the META and 
> compare the regions online in the RS.  Remove those regions from the online 
> list if they dont match.

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