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Posted to issues@hbase.apache.org by "Hadoop QA (JIRA)" <ji...@apache.org> on 2015/04/01 12:48:52 UTC
[jira] [Commented] (HBASE-13376) Improvements to Stochastic load
balancer
[ https://issues.apache.org/jira/browse/HBASE-13376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14390366#comment-14390366 ]
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/12708658/HBASE-13376_98.patch
against master branch at commit 6415742c3757ca72080ca63372d1a0f82ac7607e.
ATTACHMENT ID: 12708658
{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:red}-1 patch{color}. The patch command could not apply the patch.
Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/13519//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
> Attachments: 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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