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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8119) Optimize StochasticLoadBalancer
Date Fri, 12 Apr 2013 15:08:17 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8119?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13630149#comment-13630149
] 

Ted Yu commented on HBASE-8119:
-------------------------------

@Enis:
The following javadoc warnings appear in several QA test report:

[WARNING] /home/jenkins/jenkins-slave/workspace/PreCommit-HBASE-Build/trunk/hbase-server/src/main/java/org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.java:373:
warning - @param argument "initialRegionMapping" is not a parameter name.
[WARNING] /home/jenkins/jenkins-slave/workspace/PreCommit-HBASE-Build/trunk/hbase-server/src/main/java/org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.java:373:
warning - @param argument "clusterState" is not a parameter name.

Please fix them.

Thanks
                
> Optimize StochasticLoadBalancer
> -------------------------------
>
>                 Key: HBASE-8119
>                 URL: https://issues.apache.org/jira/browse/HBASE-8119
>             Project: HBase
>          Issue Type: Bug
>          Components: Region Assignment
>    Affects Versions: 0.95.0
>            Reporter: Enis Soztutar
>            Assignee: Enis Soztutar
>            Priority: Critical
>             Fix For: 0.98.0, 0.95.1
>
>         Attachments: hbase-8119_v2.patch, hbase-8119_v3.patch
>
>
> On a 5 node trunk cluster, I ran into a weird problem with StochasticLoadBalancer:
> server1 	Thu Mar 14 03:42:50 UTC 2013 	0.0 	33
> server2 	Thu Mar 14 03:47:53 UTC 2013 	0.0 	34
> server3 	Thu Mar 14 03:46:53 UTC 2013 	465.0 	42
> server4 	Thu Mar 14 03:47:53 UTC 2013 	11455.0 	282
> server5 	Thu Mar 14 03:47:53 UTC 2013 	0.0 	34
> Total:5 		11920 	425
> Notice that server4 has 282 regions, while the others have much less. Plus for one table
with 260 regions has been super imbalanced:
> {code}
> Regions by Region Server
> Region Server	Region Count
> http://server3:60030/ 	10
> http://server4:60030/ 	250
> {code}

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