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Date: Tue, 11 Aug 2015 17:39:46 +0000 (UTC)
From: "Ted Yu (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
Message-ID: <JIRA.12787307.1427883769000.34924.1439314786239@Atlassian.JIRA>
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Subject: [jira] [Commented] (HBASE-13376) Improvements to Stochastic load
 balancer
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    [ https://issues.apache.org/jira/browse/HBASE-13376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14682150#comment-14682150 ] 

Ted Yu commented on HBASE-13376:
--------------------------------

For build #6713 ,
{code}
Tests run: 23, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 871.97 sec - in org.apache.hadoop.hbase.master.balancer.TestStochasticLoadBalancer2
{code}

> 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: 1.0.0, 0.98.12
>            Reporter: Vandana Ayyalasomayajula
>            Assignee: Vandana Ayyalasomayajula
>            Priority: Minor
>         Attachments: 13376-v2.txt, HBASE-13376.patch, HBASE-13376_0.98.txt, HBASE-13376_0.txt, HBASE-13376_1.txt, HBASE-13376_1_1.txt, HBASE-13376_2.patch, HBASE-13376_2_branch-1.patch, HBASE-13376_3.patch, HBASE-13376_98.patch, HBASE-13376_branch-1.patch
>
>
> 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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