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From "Gary Helmling (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15529) Override needBalance in StochasticLoadBalancer
Date Fri, 20 May 2016 19:51:12 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15529?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15294057#comment-15294057
] 

Gary Helmling commented on HBASE-15529:
---------------------------------------

This appears to have broken TestRegionRebalancing in master.  I don't know how HadoopQA gave
a clean run, it's failing reliably for me.

> 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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