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https://issues.apache.org/jira/browse/HBASE-15504?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15204897#comment-15204897
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stack commented on HBASE-15504:
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What broke the balancer mighty [~eclark]?
> 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
> Reporter: Elliott Clark
>
> 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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