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From "Sergey Shelukhin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8517) Stochastic Loadbalancer isn't find steady state on real clusters
Date Thu, 09 May 2013 22:53:16 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13653341#comment-13653341
] 

Sergey Shelukhin commented on HBASE-8517:
-----------------------------------------

Well, on a real cluster of even few dozen - or few hundred - servers, would it be practical?
Maybe it should run in a thread on time bound :) Anyway, this is probably a question for separate
JIRA.
                
> Stochastic Loadbalancer isn't find steady state on real clusters
> ----------------------------------------------------------------
>
>                 Key: HBASE-8517
>                 URL: https://issues.apache.org/jira/browse/HBASE-8517
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Elliott Clark
>            Assignee: Elliott Clark
>
> I have a cluster that runs IT tests.  Last night after all tests were done I noticed
that the balancer was thrashing regions around.
> The number of regions on each machine is not correct.
> The balancer seems to value the cost of moving a region way too little.
> {code}
> 2013-05-09 16:34:58,920 DEBUG [IPC Server handler 4 on 60000] org.apache.hadoop.hbase.master.balancer.StochasticLoadBalancer:
Finished computing new load balance plan.  Computation took 5367ms to try 8910 different iterations.
 Found a solution that moves 37 regions; Going from a computed cost of 56.50254222730425 to
a new cost of 11.214035466575254
> 2013-05-09 16:37:48,715 DEBUG [IPC Server handler 7 on 60000] org.apache.hadoop.hbase.master.balancer.StochasticLoadBalancer:
Finished computing new load balance plan.  Computation took 4735ms to try 8910 different iterations.
 Found a solution that moves 38 regions; Going from a computed cost of 56.612624531830996
to a new cost of 11.275763861636982
> 2013-05-09 16:38:11,398 DEBUG [IPC Server handler 6 on 60000] org.apache.hadoop.hbase.master.balancer.StochasticLoadBalancer:
Finished computing new load balance plan.  Computation took 4502ms to try 8910 different iterations.
 Found a solution that moves 39 regions; Going from a computed cost of 56.50048461413552 to
a new cost of 11.225352339003237
> {code}
> Each of those balancer runs were triggered when there was no load on the cluster.

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