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From "Victor Xu (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-10761) StochasticLoadBalancer still uses SimpleLoadBalancer's needBalance logic
Date Sat, 15 Mar 2014 02:56:46 GMT
Victor Xu created HBASE-10761:
---------------------------------

             Summary: 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


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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