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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-13376) Improvements to Stochastic load balancer
Date Mon, 27 Jul 2015 16:20:05 GMT

    [ https://issues.apache.org/jira/browse/HBASE-13376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14642944#comment-14642944
] 

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

For latest patch:
{code}
+        LOG.warn("Could not pick lowest local region server");
{code}
'lowest local' -> 'lowest locality'

Please name your patch 'XX-branch-1.patch' so that QA bot can pick it up.

> 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: HBASE-13376_0.98.txt, HBASE-13376_0.txt, HBASE-13376_1.txt, HBASE-13376_1_1.txt,
HBASE-13376_98.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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