hbase-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8517) Stochastic Loadbalancer isn't finding steady state on real clusters
Date Sat, 25 May 2013 06:30:29 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13666990#comment-13666990
] 

Hudson commented on HBASE-8517:
-------------------------------

Integrated in hbase-0.95-on-hadoop2 #111 (See [https://builds.apache.org/job/hbase-0.95-on-hadoop2/111/])
    HBASE-8517 Stochastic Loadbalancer isn't finding steady state on real clusters (Revision
1486257)

     Result = FAILURE
eclark : 
Files : 
* /hbase/branches/0.95/hbase-server/src/main/java/org/apache/hadoop/hbase/master/balancer/BaseLoadBalancer.java
* /hbase/branches/0.95/hbase-server/src/main/java/org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.java
* /hbase/branches/0.95/hbase-server/src/test/java/org/apache/hadoop/hbase/master/balancer/BalancerTestBase.java
* /hbase/branches/0.95/hbase-server/src/test/java/org/apache/hadoop/hbase/master/balancer/TestDefaultLoadBalancer.java
* /hbase/branches/0.95/hbase-server/src/test/java/org/apache/hadoop/hbase/master/balancer/TestStochasticLoadBalancer.java

                
> Stochastic Loadbalancer isn't finding steady state on real clusters
> -------------------------------------------------------------------
>
>                 Key: HBASE-8517
>                 URL: https://issues.apache.org/jira/browse/HBASE-8517
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.95.0, 0.95.1
>            Reporter: Elliott Clark
>            Assignee: Elliott Clark
>            Priority: Blocker
>             Fix For: 0.95.1
>
>         Attachments: HBASE-8517-0.patch, HBASE-8517-1.patch, HBASE-8517-2.patch, HBASE-8517-3.patch,
HBASE-8517-4.patch, HBASE-8517-5.patch, HBASE-8517-6.patch, HBASE-8517-7.patch
>
>
> 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.

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira

Mime
View raw message