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https://issues.apache.org/jira/browse/HBASE-2802?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12884864#action_12884864
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stack commented on HBASE-2802:
------------------------------
To be clear this issue is inthe main targeted at 0. 20 branch to help out our
Mozilla brethren
> Stop daughter regions both being assigned same server
> -----------------------------------------------------
>
> Key: HBASE-2802
> URL: https://issues.apache.org/jira/browse/HBASE-2802
> Project: HBase
> Issue Type: Improvement
> Reporter: stack
> Fix For: 0.20.6, 0.21.0
>
> Attachments: moz.txt
>
>
> On split, usually the two daughter regions end up on assignment list at same
> time. Dependent on cluster state and what balancer says, when a server
> checks in, we'll assign at least two regions in the one go so daughters then
> end up on same server. This patch makes it so we don't assign contiguous
> regions in the one assignment.
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