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Date: Mon, 6 Feb 2012 22:16:59 +0000 (UTC)
From: "Hudson (Commented) (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
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Subject: [jira] [Commented] (MAPREDUCE-3813) RackResolver should maintain a
 cache to avoid repetitive lookups.
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    [ https://issues.apache.org/jira/browse/MAPREDUCE-3813?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13201681#comment-13201681 ] 

Hudson commented on MAPREDUCE-3813:
-----------------------------------

Integrated in Hadoop-Hdfs-trunk-Commit #1744 (See [https://builds.apache.org/job/Hadoop-Hdfs-trunk-Commit/1744/])
    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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