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https://issues.apache.org/jira/browse/HBASE-25894?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17352934#comment-17352934
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Andrew Kyle Purtell commented on HBASE-25894:
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Sounds good, thanks. 

> Improve the performance for region load and region count related cost 
> functions
> -------------------------------------------------------------------------------
>
>                 Key: HBASE-25894
>                 URL: https://issues.apache.org/jira/browse/HBASE-25894
>             Project: HBase
>          Issue Type: Sub-task
>          Components: Balancer, Performance
>            Reporter: Duo Zhang
>            Assignee: Duo Zhang
>            Priority: Major
>             Fix For: 3.0.0-alpha-1, 2.5.0
>
>
> For a large cluster, we have a lot of regions, so computing the whole cost 
> will be expensive. We should try to remove the unnecessary calculation as 
> much as possible.



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