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https://issues.apache.org/jira/browse/HBASE-5970?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13271113#comment-13271113
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Zhihong Yu commented on HBASE-5970:
-----------------------------------
{code}
+ serverToUpdateTimer = serversInUpdatingTimer
+ .higher(serverToUpdateTimer);
+ }
+ if (serverToUpdateTimer == null) {
+ break;
{code}
What would happen if a 'lower' ServerName gets its timers updated, gets removed
from serversInUpdatingTimer and later is added back to serversInUpdatingTimer ?
How would this server be picked up ?
> 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: HBASE-5970.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 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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