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https://issues.apache.org/jira/browse/HBASE-15529?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15294682#comment-15294682
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Guanghao Zhang commented on HBASE-15529:
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Attach a v3 patch.
TestRegionRebalanceing failed because the default minCostNeedBalance is 0.05.
So I set the config before this ut to fix this.
The reason of TestStochasticLoadBalancer2.testRegionReplicasOnMidCluster failed
is same with previous
TestStochasticLoadBalancer2#testRegionReplicasOnLargeCluster. The balancer
can't total balance in the max running time. So it need add config before test,
too.
> 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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