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https://issues.apache.org/jira/browse/HBASE-6143?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13723470#comment-13723470
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Lars Hofhansl commented on HBASE-6143:
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Regions are not rebalanced based on locality (currently - but see HBASE-4191).
The only way to restore locality (after it was lost) is to trigger compactions,
so that data gets rewritten locally.
Facebook also worked on HDFS level placement groups in order to improve
locality (I do not think this is in any official Hadoop release, though).
> Make region assignment smarter when regions are re-enabled.
> -----------------------------------------------------------
>
> Key: HBASE-6143
> URL: https://issues.apache.org/jira/browse/HBASE-6143
> Project: HBase
> Issue Type: Improvement
> Reporter: Elliott Clark
> Assignee: Ted Yu
> Priority: Critical
> Fix For: 0.95.2
>
> Attachments: 6143-v1.txt, 6143-v2.txt, 6143-v3.txt,
> HBASE-6143-0.patch, HBASE-6143-1.patch
>
>
> Right now a random region server is picked when re-enabling a table. This
> could be much smarter.
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