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From "Elliott Clark (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12890) Provide a way to throttle the number of regions moved by the balancer
Date Wed, 21 Jan 2015 07:55:34 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12890?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14285308#comment-14285308
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Elliott Clark commented on HBASE-12890:
---------------------------------------

I think the best way to do this is to make the balancer know how to slowly move the regions.
{code}hbase.master.balancer.stochastic.maxMoveRegions{code} is the setting for to limit the
max number of regions the balancer will move in one invocation.

> Provide a way to throttle the number of regions moved by the balancer
> ---------------------------------------------------------------------
>
>                 Key: HBASE-12890
>                 URL: https://issues.apache.org/jira/browse/HBASE-12890
>             Project: HBase
>          Issue Type: Improvement
>    Affects Versions: 2.0.0, 0.98.10, 1.1.0
>            Reporter: churro morales
>            Assignee: churro morales
>         Attachments: HBASE-12890.patch
>
>
> We have a very large cluster and we frequently add remove quite a few regionservers from
our cluster.  Whenever we do this the balancer moves thousands of regions at once.  Instead
we provide a configuration parameter: hbase.balancer.max.regions.  This limits the number
of regions that are balanced per iteration.  



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