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https://issues.apache.org/jira/browse/HBASE-1621?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12879843#action_12879843
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stack commented on HBASE-1621:
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Or rather, we shouldn't have to take the table offline at all... just close 
regions to be merged, merge them while all else is online, then update meta.

> merge tool should work on online cluster, but disabled table
> ------------------------------------------------------------
>
>                 Key: HBASE-1621
>                 URL: https://issues.apache.org/jira/browse/HBASE-1621
>             Project: HBase
>          Issue Type: Bug
>            Reporter: ryan rawson
>             Fix For: 0.21.0
>
>
> taking down the entire cluster to merge 2 regions is a pain, i dont see why 
> the table or regions specifically couldnt be taken offline, then merged then 
> brought back up.
> this might need a new API to the regionservers so they can take direction 
> from not just the master.

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