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https://issues.apache.org/jira/browse/MAPREDUCE-3813?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13202351#comment-13202351
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Hudson commented on MAPREDUCE-3813:
-----------------------------------
Integrated in Hadoop-Mapreduce-0.23-Build #184 (See
[https://builds.apache.org/job/Hadoop-Mapreduce-0.23-Build/184/])
Merge -c 1241209 from trunk to branch-0.23 to fix MAPREDUCE-3813. Added a
cache for resolved racks.
acmurthy :
http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1241210
Files :
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/CHANGES.txt
*
/hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/util/RackResolver.java
*
/hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/hadoop-yarn/hadoop-yarn-common/src/test/java/org/apache/hadoop/yarn/util/TestRackResolver.java
> RackResolver should maintain a cache to avoid repetitive lookups.
> -----------------------------------------------------------------
>
> Key: MAPREDUCE-3813
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-3813
> Project: Hadoop Map/Reduce
> Issue Type: Sub-task
> Components: mrv2, performance
> Affects Versions: 0.23.0
> Reporter: Vinod Kumar Vavilapalli
> Assignee: Vinod Kumar Vavilapalli
> Fix For: 0.23.1
>
> Attachments: MAPREDUCE-3813-20120205.txt
>
>
> With the current code, during task creation, we repeatedly resolve hosts and
> RackResolver doesn't cache any of the results. Caching will improve
> performance.
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