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From "Victor Xu (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-10761) StochasticLoadBalancer still uses SimpleLoadBalancer's needBalance logic
Date Sat, 15 Mar 2014 05:19:43 GMT

     [ https://issues.apache.org/jira/browse/HBASE-10761?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Victor Xu updated HBASE-10761:

    Attachment: HBASE_10761_v2.patch

I move most of the original needBalance logic of BaseLoadBalancer into SimpleLoadBalancer,
leaving only MIN_SERVER_CALANCE checking logic.
So StochasticLoadBalancer can directly call BaseLoadBalancer's needBalance().

> StochasticLoadBalancer still uses SimpleLoadBalancer's needBalance logic
> ------------------------------------------------------------------------
>                 Key: HBASE-10761
>                 URL: https://issues.apache.org/jira/browse/HBASE-10761
>             Project: HBase
>          Issue Type: Bug
>          Components: Balancer
>    Affects Versions: 0.98.0
>            Reporter: Victor Xu
>         Attachments: HBASE_10761.patch, HBASE_10761_v2.patch
> StochasticLoadBalancer has become the default balancer since 0.98.0. But its balanceCluster
method still uses the BaseLoadBalancer.needBalance() which is originally designed for SimpleLoadBalancer.
It's all based on the number of regions on the regionservers.
> This can cause such a problem: when the cluster has some Hot Spot Region, the balance
process may not be triggered because the numbers of regions on the RegionServers are averaged.

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