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From "Vandana Ayyalasomayajula (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-13376) Improvements to Stochastic load balancer
Date Wed, 01 Apr 2015 10:22:54 GMT
Vandana Ayyalasomayajula created HBASE-13376:
------------------------------------------------

             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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