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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-13376) Improvements to Stochastic load balancer
Date Wed, 26 Aug 2015 10:21:47 GMT

    [ https://issues.apache.org/jira/browse/HBASE-13376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14712890#comment-14712890
] 

Hudson commented on HBASE-13376:
--------------------------------

FAILURE: Integrated in HBase-0.98-on-Hadoop-1.1 #1055 (See [https://builds.apache.org/job/HBase-0.98-on-Hadoop-1.1/1055/])
Revert "HBASE-13376 Improvements to Stochastic load balancer (Vandana Ayyalasomayajula)" (apurtell:
rev 4aa14b6c9074002abb92181d99bf65e7f0e46a22)
* hbase-server/src/main/java/org/apache/hadoop/hbase/master/balancer/RegionLocationFinder.java
* hbase-server/src/test/java/org/apache/hadoop/hbase/master/balancer/TestStochasticLoadBalancer.java
* hbase-server/src/main/java/org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.java
* hbase-server/src/main/java/org/apache/hadoop/hbase/master/balancer/BaseLoadBalancer.java


> 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, 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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