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Posted to issues@hbase.apache.org by "Guanghao Zhang (JIRA)" <ji...@apache.org> on 2015/10/15 02:53:05 UTC
[jira] [Updated] (HBASE-14604) Improve MoveCostFunction in
StochasticLoadBalancer
[ https://issues.apache.org/jira/browse/HBASE-14604?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Guanghao Zhang updated HBASE-14604:
-----------------------------------
Attachment: HBASE-14604_98.diff
patch for 98
> Improve MoveCostFunction in StochasticLoadBalancer
> --------------------------------------------------
>
> Key: HBASE-14604
> URL: https://issues.apache.org/jira/browse/HBASE-14604
> Project: HBase
> Issue Type: Bug
> Components: Balancer
> Reporter: Guanghao Zhang
> Assignee: Guanghao Zhang
> Attachments: HBASE-14604_98.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 maxMoves.
> {code}
> return scale(0, Math.min(cluster.numRegions, maxMoves) + META_MOVE_COST_MULT, moveCost);
> {code}
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