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https://issues.apache.org/jira/browse/HBASE-14604?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ted Yu resolved HBASE-14604.
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Resolution: Fixed
Thanks for the patch, Guanghao
> Improve MoveCostFunction in StochasticLoadBalancer
> --------------------------------------------------
>
> Key: HBASE-14604
> URL: https://issues.apache.org/jira/browse/HBASE-14604
> Project: HBase
> Issue Type: Bug
> Components: Balancer
> Affects Versions: 0.98.15
> Reporter: Guanghao Zhang
> Assignee: Guanghao Zhang
> Fix For: 2.0.0, 1.3.0, 0.98.16
>
> Attachments: HBASE-14604-0.98.patch, HBASE-14604-0.98_v1.patch,
> HBASE-14604-trunk.patch, HBASE-14604-trunk_v1.patch, HBASE-14604_98.diff,
> HBASE-14604_98_with_ut.diff
>
>
> The code in MoveCoseFunction:
> {code}
> return scale(0, cluster.numRegions + META_MOVE_COST_MULT, moveCost);
> {code}
> It uses cluster.numRegions + META_MOVE_COST_MULT as the max value when scale
> moveCost to [0,1]. But this should use maxMoves as the max value when cluster
> have a lot of regions.
> Assume a cluster have 10000 regions, maxMoves is 2500, it only scale moveCost
> to [0, 0.25].
> Improve moveCost by use Math.min(cluster.numRegions, maxMoves) as the max
> cost, so it can scale moveCost to [0,1].
> {code}
> return scale(0, Math.min(cluster.numRegions, maxMoves) + META_MOVE_COST_MULT,
> moveCost);
> {code}
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