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Hudson commented on MAPREDUCE-3813:
-----------------------------------
Integrated in Hadoop-Common-trunk-Commit #1672 (See [https://builds.apache.org/job/Hadoop-Common-trunk-Commit/1672/])
MAPREDUCE-3813. Added a cache for resolved racks. Contributed by Vinod K V.
acmurthy : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1241209
Files :
* /hadoop/common/trunk/hadoop-mapreduce-project/CHANGES.txt
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/util/RackResolver.java
* /hadoop/common/trunk/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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