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

["stack (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-13376?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

stack resolved HBASE-13376.
---------------------------
    Resolution: Fixed

@apurtell reopened this issue so he could revert from 0.98 because problematic and unaddressed. Let me now resolve it. I also added 1.2.0 to the list of versions that got this patch since it is in it.

Linking to HBASE-15210, too much logging brought on by this patch.

> 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
>             Fix For: 2.0.0, 1.2.0, 1.3.0
>
>         Attachments: 13376-v2.txt, 13376-v5.patch, 13376_4.patch, HBASE-13376.patch, HBASE-13376_0.98.txt, HBASE-13376_0.98_v2.patch, 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_3.patch, HBASE-13376_4.patch, HBASE-13376_5_branch-1.patch, HBASE-13376_6_branch-1.patch, HBASE-13376_98.patch, HBASE-13376_branch-1.patch, HBASE-13376_v3_0.98.patch, HBASE-13376_v4_0.98.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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