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https://issues.apache.org/jira/browse/HBASE-7340?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13530554#comment-13530554
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Ted Yu commented on HBASE-7340:
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@Andy:
Can you clarify which of the two choices listed you favor ?
If we add notification per region moved, HMaster.balance() may move fewer
regions compared to the current code - we don't know the amount of time each
notification may take.
> 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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