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Posted to dev@hbase.apache.org by "Vandana Ayyalasomayajula (JIRA)" <ji...@apache.org> on 2015/04/01 12:22:54 UTC

[jira] [Created] (HBASE-13376) Improvements to Stochastic load balancer

Vandana Ayyalasomayajula created HBASE-13376:
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             Summary: Improvements to Stochastic load balancer
                 Key: HBASE-13376
                 URL: https://issues.apache.org/jira/browse/HBASE-13376
             Project: HBase
          Issue Type: Improvement
          Components: Balancer
    Affects Versions: 0.98.12, 1.0.0
            Reporter: Vandana Ayyalasomayajula
            Assignee: Vandana Ayyalasomayajula
            Priority: Minor


There are two things this jira tries to address:

1. The locality picker in the stochastic balancer does not pick regions with least locality as candidates for swap/move. So when any user configures locality cost in the configs, the balancer does not always seems to move regions with bad locality. 

2. When a cluster has equal number of loaded regions, it always picks the first one. It should pick a random region on one of the equally loaded servers. This improves a chance of finding a good candidate, when load picker is invoked several times. 



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