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https://issues.apache.org/jira/browse/HBASE-3724?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13187458#comment-13187458
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Zhihong Yu commented on HBASE-3724:
-----------------------------------

If the 50 hot regions are created due to region splits, load balancer is able 
to distinguish them from cold regions and pick both hot and cold regions for 
the new server.

If the hot regions were created due to pre-split, I have code in internal 
repository to use region load information in achieving balance. This code is to 
be open-sourced.
                
> Load balancer improvements
> --------------------------
>
>                 Key: HBASE-3724
>                 URL: https://issues.apache.org/jira/browse/HBASE-3724
>             Project: HBase
>          Issue Type: Umbrella
>            Reporter: stack
>
> Umbrella issue under which we hang all regions related to balancer

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