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https://issues.apache.org/jira/browse/HBASE-25882?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiaolin Ha resolved HBASE-25882.
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Resolution: Won't Fix
> Duplicate cost calculation by TableSkewCostFunction when balancing by table
> ---------------------------------------------------------------------------
>
> Key: HBASE-25882
> URL: https://issues.apache.org/jira/browse/HBASE-25882
> Project: HBase
> Issue Type: Improvement
> Components: Balancer
> Affects Versions: 3.0.0-alpha-1, 2.0.0
> Reporter: Xiaolin Ha
> Assignee: Xiaolin Ha
> Priority: Major
> Attachments: image-2021-08-17-20-20-12-768.png
>
>
> When using balance by table, the StochasticLoadBalancer will create the
> cluster state according to the regions distribution of only one table. As a
> result, the TableSkewCostFunction should be replaced by the
> RegionCountSkewCostFunction when the table count of the cluster state is less
> than 2.
> The most important problem is that, TableSkewCostFunction will cause
> unnecessary calculation steps when there is only one table.
> For example，we have 40000+ regions for one table in one group, balance this
> table may calculate lots of steps, but we can avoid duplicate computing costs
> of TableSkewCostFunction while computing cost of RegionCountSkewCostFunction
> and balancing by table.
>
> !image-2021-08-17-20-20-12-768.png|width=907,height=164!
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