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From "Guanghao Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Work started] (HBASE-14604) Improve MoveCostFunction in StochasticLoadBalancer
Date Mon, 19 Oct 2015 10:46:05 GMT

     [ https://issues.apache.org/jira/browse/HBASE-14604?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Work on HBASE-14604 started by Guanghao Zhang.
----------------------------------------------
> 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
>         Attachments: 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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