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https://issues.apache.org/jira/browse/HBASE-15504?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15239137#comment-15239137
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Guanghao Zhang commented on HBASE-15504:
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If cluster have more than 2400 regions，move cost will be 4 times larger after
HBASE-14604. But if config hbase.master.balancer.stochastic.maxMovePercent to
1.0, move cost will be same with before HBASE-14604. Can you share more config
and status about your cluster?
> Fix Balancer in 1.3 not moving regions off overloaded regionserver
> ------------------------------------------------------------------
>
> Key: HBASE-15504
> URL: https://issues.apache.org/jira/browse/HBASE-15504
> Project: HBase
> Issue Type: Bug
> Affects Versions: 1.3.0
> Reporter: Elliott Clark
> Assignee: Elliott Clark
> Fix For: 2.0.0, 1.3.0, 1.4.0
>
> Attachments: HBASE-15504-v3.patch
>
>
> We pushed 1.3 to a couple of clusters. In some cases the regions were
> assigned VERY un-evenly and the regions would not move after that.
> We ended up with one rs getting thousands of regions and most servers getting
> 0. Running balancer would do nothing. The balancer would say that it couldn't
> find a solution with less than the current cost.
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