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https://issues.apache.org/jira/browse/HBASE-5970?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13286396#comment-13286396
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ramkrishna.s.vasudevan commented on HBASE-5970:
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@Chunhui
bq.And, we should try our best to ensure that there is no case to need use
TimeoutMonitor assign region.
Yes. This is what we are also trying to achieve. Many of our issues is also
targeted on that.
> 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
> Fix For: 0.96.0
>
> 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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