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https://issues.apache.org/jira/browse/HBASE-13376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14702093#comment-14702093
 ] 

Hadoop QA commented on HBASE-13376:
-----------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest 
attachment 
  
http://issues.apache.org/jira/secure/attachment/12751067/HBASE-13376_v3_0.98.patch
  against 0.98 branch at commit 68113abec5a87ea578628ad0831ef4a32eba5f06.
  ATTACHMENT ID: 12751067

    {color:green}+1 @author{color}.  The patch does not contain any @author 
tags.

    {color:green}+1 tests included{color}.  The patch appears to include 3 new 
or modified tests.

    {color:green}+1 hadoop versions{color}. The patch compiles with all 
supported hadoop versions (2.4.0 2.4.1 2.5.0 2.5.1 2.5.2 2.6.0 2.7.0)

    {color:green}+1 javac{color}.  The applied patch does not increase the 
total number of javac compiler warnings.

    {color:green}+1 protoc{color}.  The applied patch does not increase the 
total number of protoc compiler warnings.

    {color:red}-1 javadoc{color}.  The javadoc tool appears to have generated 
22 warning messages.

                {color:red}-1 checkstyle{color}.  The applied patch generated 
3882 checkstyle errors (more than the master's current 3876 errors).

    {color:green}+1 findbugs{color}.  The patch does not introduce any  new 
Findbugs (version 2.0.3) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase 
the total number of release audit warnings.

    {color:green}+1 lineLengths{color}.  The patch does not introduce lines 
longer than 100

  {color:green}+1 site{color}.  The mvn post-site goal succeeds with this patch.

    {color:green}+1 core tests{color}.  The patch passed unit tests in .

Test results: 
https://builds.apache.org/job/PreCommit-HBASE-Build/15149//testReport/
Release Findbugs (version 2.0.3)        warnings: 
https://builds.apache.org/job/PreCommit-HBASE-Build/15149//artifact/patchprocess/newFindbugsWarnings.html
Checkstyle Errors: 
https://builds.apache.org/job/PreCommit-HBASE-Build/15149//artifact/patchprocess/checkstyle-aggregate.html

                Javadoc warnings: 
https://builds.apache.org/job/PreCommit-HBASE-Build/15149//artifact/patchprocess/patchJavadocWarnings.txt
Console output: 
https://builds.apache.org/job/PreCommit-HBASE-Build/15149//console

This message is automatically generated.

> 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, 1.3.0
>
>         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
>
>
> 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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