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https://issues.apache.org/jira/browse/HADOOP-1155?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12489364
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Hadoop QA commented on HADOOP-1155:
-----------------------------------
Integrated in Hadoop-Nightly #60 (See
http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Nightly/60/)
> Additional performance improvement to chooseTarget
> --------------------------------------------------
>
> Key: HADOOP-1155
> URL: https://issues.apache.org/jira/browse/HADOOP-1155
> Project: Hadoop
> Issue Type: Improvement
> Components: dfs
> Affects Versions: 0.12.2
> Reporter: Hairong Kuang
> Assigned To: Hairong Kuang
> Fix For: 0.13.0
>
> Attachments: rackMap.patch, rackMap1.patch, rackMap2.patch,
> rackMap3.patch
>
>
> A few additional thoughts to improve the performance of chooseTarget:
> 1. Reduce the # of calls to getDistance in sortedByDistance
> 2. Improve the performance of getNode by adding a rack name to rack node map
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