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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-10761) StochasticLoadBalancer still uses SimpleLoadBalancer's needBalance logic
Date Thu, 01 May 2014 01:14:28 GMT

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

Andrew Purtell updated HBASE-10761:
-----------------------------------

    Fix Version/s:     (was: 0.98.2)
                   0.98.3

> 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
>             Fix For: 0.99.0, 0.98.3
>
>         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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