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https://issues.apache.org/jira/browse/HBASE-7340?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13531052#comment-13531052
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Ted Yu commented on HBASE-7340:
-------------------------------
For HMaster.balance(), we first unassign the regions. For postBalance() call,
the regions may not have time to reach destination. I think in this case
postBalance() just provides some hint as for the final destination.
> Allow user-specified actions following region movement
> ------------------------------------------------------
>
> Key: HBASE-7340
> URL: https://issues.apache.org/jira/browse/HBASE-7340
> Project: HBase
> Issue Type: Bug
> Reporter: Ted Yu
>
> Sometimes user performs compaction after a region is moved (by balancer). We
> should provide 'hook' which lets user specify what follow-on actions to take
> after region movement.
> See discussion on user mailing list under the thread 'How to know it's time
> for a major compaction?' for background information:
> http://search-hadoop.com/m/BDx4S1jMjF92&subj=How+to+know+it+s+time+for+a+major+compaction+
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