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From "litieqiao (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-13376) Improvements to Stochastic load balancer
Date Thu, 22 Oct 2015 06:14:27 GMT

    [ https://issues.apache.org/jira/browse/HBASE-13376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14968620#comment-14968620
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litieqiao commented on HBASE-13376:
-----------------------------------

hi ,Vandana Ayyalasomayajula.

thank you for your Share. I have fixed my hbase cluster's balancer problem with this patch.than
you very much.

when i was try to balance manually,i seem than it need a little code change in the function
getLeastLoadedTopServerForRegion(int region) of BaseLoadBalancer.java
(org/apache/hadoop/hbase/master/balancer/BaseLoadBalancer.java)

----------------------------------
1)before modify  
int index = serversToIndex.get(sn);

2)after modify
int index = serversToIndex.get(sn.getHostAndPort());
----------------------------------

is that true?
thank you for your attention.3ks.

> 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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