[jira] [Reopened] (HBASE-15529) Override needBalance in StochasticLoadBalancer

["Ted Yu (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-15529?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ted Yu reopened HBASE-15529:
----------------------------

> Override needBalance in StochasticLoadBalancer
> ----------------------------------------------
>
>                 Key: HBASE-15529
>                 URL: https://issues.apache.org/jira/browse/HBASE-15529
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Guanghao Zhang
>            Assignee: Guanghao Zhang
>            Priority: Minor
>             Fix For: 2.0.0, 1.4.0
>
>         Attachments: 15529-v1.patch, HBASE-15529-v1.patch, HBASE-15529-v2.patch, HBASE-15529.patch
>
>
> StochasticLoadBalancer includes cost functions to compute the cost of region rount, r/w qps, table load, region locality, memstore size, and storefile size. Every cost function returns a number between 0 and 1 inclusive and the computed costs are scaled by their respective multipliers. The bigger multiplier means that the respective cost function have the bigger weight. But needBalance decide whether to balance only by region count and doesn't consider r/w qps, locality even you config these cost function with bigger multiplier. StochasticLoadBalancer should override needBalance and decide whether to balance by it's configs of cost functions.
> Add one new config hbase.master.balancer.stochastic.minCostNeedBalance, cluster need balance when (total cost / sum multiplier) > minCostNeedBalance.



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