Andrew Kyle Purtell created HBASE-23153:
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             Summary: 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


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 if 0 even though its weight will be included in the 
sum of the weights. 



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