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https://issues.apache.org/jira/browse/HBASE-5970?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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chunhui shen updated HBASE-5970:
--------------------------------

    Attachment: HBASE-5970v4.patch

Reattaching patch v4
                
> 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
>            Priority: Critical
>         Attachments: 5970v3.patch, HBASE-5970.patch, HBASE-5970v2.patch, 
> HBASE-5970v3.patch, HBASE-5970v4.patch, HBASE-5970v4.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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