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https://issues.apache.org/jira/browse/HBASE-7340?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ted Yu updated HBASE-7340:
--------------------------
Description:
I found this issue when reading user discussion which is quoted below.
In HMaster.moveRegion(), we 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 should enhance the following hook (at line 1335) with list of
regions moved so that notification from master is consistent:
{code}
this.cpHost.postBalance();
{code}
Here is excerpt for user discussion:
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+
was:
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+
Issue Type: Bug (was: Task)
Summary: Master coprocessor notification for
assignmentManager.balance() is inconsistent (was: Allow user-specified actions
following region movement)
@Stack:
As mentioned above, I have modified the subject of this JIRA to reflect latest
progress.
> Master coprocessor notification for assignmentManager.balance() is
> inconsistent
> -------------------------------------------------------------------------------
>
> Key: HBASE-7340
> URL: https://issues.apache.org/jira/browse/HBASE-7340
> Project: HBase
> Issue Type: Bug
> Reporter: Ted Yu
> Assignee: Ted Yu
> Attachments: 7340-v1.txt
>
>
> I found this issue when reading user discussion which is quoted below.
> In HMaster.moveRegion(), we 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 should enhance the following hook (at line 1335) with list of
> regions moved so that notification from master is consistent:
> {code}
> this.cpHost.postBalance();
> {code}
> Here is excerpt for user discussion:
> 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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