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From "Enis Soztutar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8119) StochasticLoadBalancer does not take into account per table balance
Date Fri, 15 Mar 2013 03:10:12 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8119?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13603052#comment-13603052
] 

Enis Soztutar commented on HBASE-8119:
--------------------------------------

After I deleted other 5 tables, which span ~175 regions, StochasticLoadBalancer was able to
run in 26 sec, and after that regions are balanced. 
{code}
2013-03-15 03:05:41,943 DEBUG org.apache.hadoop.hbase.master.balancer.StochasticLoadBalancer:
Finished computing new laod balance plan.  Computation took 26904ms to try 15000 different
iterations.  Found a solution that moves 196 regions; Going from a computed cost of 65.70466155810982
to a new cost of 14.744572158365262
{code}

{code}
server1 	Fri Mar 15 03:02:12 UTC 2013 	16041.0 	52
server2 	Fri Mar 15 03:02:12 UTC 2013 	15785.0 	52
server3 	Fri Mar 15 03:02:13 UTC 2013 	16667.0 	52
server4 	Fri Mar 15 03:02:13 UTC 2013 	21632.0 	53
server5 	Fri Mar 15 03:02:13 UTC 2013 	16974.0 	52
Total:5 		87099 	261
{code}
                
> StochasticLoadBalancer does not take into account per table balance
> -------------------------------------------------------------------
>
>                 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
>             Fix For: 0.95.0
>
>
> 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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