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Date: Mon, 21 May 2012 19:05:41 +0000 (UTC)
From: "nkeywal (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
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Subject: [jira] [Commented] (HBASE-5970) Improve the
 AssignmentManager#updateTimer and speed up handling opened event
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    [ https://issues.apache.org/jira/browse/HBASE-5970?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13280367#comment-13280367 ] 

nkeywal commented on HBASE-5970:
--------------------------------

Hi,

Could you share the logs of the tests? I would be interested to have a look at them.
The javadoc for updateTimers says it's not used for bulk assignment, is there a mix of regions 'bulk assigned' and other regions?
I see as well in the description that the time was once with 'retainAssignment=true' and once without. Are the results comparable in both cases?

Thank you!
                
> Improve the AssignmentManager#updateTimer and speed up handling opened event
> ----------------------------------------------------------------------------
>
>                 Key: HBASE-5970
>                 URL: https://issues.apache.org/jira/browse/HBASE-5970
>             Project: HBase
>          Issue Type: Improvement
>          Components: master
>            Reporter: chunhui shen
>            Assignee: chunhui shen
>         Attachments: 5970v3.patch, HBASE-5970.patch, HBASE-5970v2.patch, HBASE-5970v3.patch
>
>
> We found handing opened event very slow in the environment with lots of regions.
> The problem is the slow AssignmentManager#updateTimer.
> We do the test for bulk assigning 10w (i.e. 100k) regions, the whole process of bulk assigning took 1 hours.
> 2012-05-06 20:31:49,201 INFO org.apache.hadoop.hbase.master.AssignmentManager: Bulk assigning 100000 region(s) round-robin across 5 server(s)
> 2012-05-06 21:26:32,103 INFO org.apache.hadoop.hbase.master.AssignmentManager: Bulk assigning done
> I think we could do the improvement for the AssignmentManager#updateTimer: Make a thread do this work.
> After the improvement, it took only 4.5mins
> 2012-05-07 11:03:36,581 INFO org.apache.hadoop.hbase.master.AssignmentManager: Bulk assigning 100000 region(s) across 5 server(s), retainAssignment=true 
> 2012-05-07 11:07:57,073 INFO org.apache.hadoop.hbase.master.AssignmentManager: Bulk assigning done 

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