[jira] [Resolved] (HBASE-23153) PrimaryRegionCountSkewCostFunction SLB function should implement CostFunction#isNeeded

["Sean Busbey (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-23153?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sean Busbey resolved HBASE-23153.
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    Release Note: 
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The `PrimaryRegionCountSkewCostFunction` for the `StochasticLoadBalancer` is only needed when the read replicas feature is enabled. With this change, that function now properly indicates that it is not needed when the read replica feature is off.

If this improvement is not available, operators with clusters that are not using the read replica feature should manually disable it by setting `hbase.master.balancer.stochastic.primaryRegionCountCost` to `0.0` in hbase-site.xml for all HBase Masters.
      Resolution: Fixed

> PrimaryRegionCountSkewCostFunction SLB function should implement CostFunction#isNeeded
> --------------------------------------------------------------------------------------
>
>                 Key: HBASE-23153
>                 URL: https://issues.apache.org/jira/browse/HBASE-23153
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Andrew Kyle Purtell
>            Assignee: Andrew Kyle Purtell
>            Priority: Major
>             Fix For: 3.0.0, 2.3.0, 2.1.8, 2.2.2, 1.4.11, 1.6.0
>
>
> The PrimaryRegionCountSkewCostFunction SLB function should implement CostFunction#isNeeded and like the other region replica specific functions should return false for it when region replicas are not in use. Otherwise it will always report a cost of 0 even though its weight will be included in the sum of the weights. 



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