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Posted to issues@hbase.apache.org by "Vandana Ayyalasomayajula (JIRA)" <ji...@apache.org> on 2015/04/01 12:31:52 UTC
[jira] [Updated] (HBASE-13376) Improvements to Stochastic load
balancer
[ https://issues.apache.org/jira/browse/HBASE-13376?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Vandana Ayyalasomayajula updated HBASE-13376:
---------------------------------------------
Attachment: HBASE-13376_98.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
> 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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