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Date: Wed, 21 Jan 2015 07:55:34 +0000 (UTC)
From: "Elliott Clark (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
Message-ID: <JIRA.12768838.1421799503000.132207.1421826934883@Atlassian.JIRA>
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Subject: [jira] [Commented] (HBASE-12890) Provide a way to throttle the
 number of regions moved by the balancer
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    [ https://issues.apache.org/jira/browse/HBASE-12890?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14285308#comment-14285308 ] 

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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