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https://issues.apache.org/jira/browse/HBASE-7340?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13530485#comment-13530485
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Ted Yu commented on HBASE-7340:
-------------------------------
In HMaster.moveRegion(), we already have:
{code}
this.assignmentManager.balance(rp);
if (this.cpHost != null) {
this.cpHost.postMove(hri, rp.getSource(), rp.getDestination());
}
{code}
Meaning, user can register master coprocessor which would receive region
movement notification.
The assignmentManager.balance(plan) call in HMaster.balance() doesn't send out
such notification.
I think we can either add notification per region moved, or enhance the
following hook (at line 1335) with list of regions moved:
{code}
this.cpHost.postBalance();
{code}
Comments are welcome.
> 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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