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From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5970) Improve the AssignmentManager#updateTimer and speed up handling opened event
Date Thu, 31 May 2012 07:14:23 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5970?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13286380#comment-13286380
] 

ramkrishna.s.vasudevan commented on HBASE-5970:
-----------------------------------------------

@Chunhui
What i meant is overall the updatetimers itself affects the TM.  The problem is updatetimer
just updates all the RITs time with the current time.
Suppose the TM saw the RIT at time x.  Now if the timeout monitor is 5 mins.  Exactly after
x+5 we expect the TM to reassign.  But the updatetimer will update all the regions in RIT.
 So even this region who should be assinged after x+5 will also get updated to the current
time.
So now the TM will be able to take action only after x+5+Delta.  Currently as it is 30 mins
we wont be much affected as no one will be waiting for 30 mins.
                
> 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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