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From "Elliott Clark (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8119) Optimize StochasticLoadBalancer
Date Wed, 03 Apr 2013 19:07:16 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8119?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13621200#comment-13621200
] 

Elliott Clark commented on HBASE-8119:
--------------------------------------

+1.  Lets try this out on 0.95 releases.  I'm still concerned about the one multiplier, but
real world clusters will be the best judge.
                
> 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
>            Priority: Critical
>             Fix For: 0.95.1
>
>
> 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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