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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-968) Reduce shuffle and merge should be done a child JVM
Date Wed, 18 Apr 2007 11:05:16 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-968?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12489692
] 

Hadoop QA commented on HADOOP-968:
----------------------------------

Integrated in Hadoop-Nightly #61 (See http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Nightly/61/)

> Reduce shuffle and merge should be done a child JVM
> ---------------------------------------------------
>
>                 Key: HADOOP-968
>                 URL: https://issues.apache.org/jira/browse/HADOOP-968
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: mapred
>    Affects Versions: 0.10.1
>            Reporter: Owen O'Malley
>         Assigned To: Devaraj Das
>             Fix For: 0.13.0
>
>         Attachments: 968-reindent.patch, 968-with-metrics-fix.new.patch, 968-with-metrics-fix.patch,
968.apr06.patch, 968.apr10.patch, 968.apr14.patch, 968.apr14.patch, 968.patch
>
>
> The Reduce's shuffle and initial merge is done in the TaskTracker's JVM. It would be
better to have it run in the Task's child JVM. The advantages are:
>   1. The class path and environment would be set up correctly.
>   2. User code doesn't need to be loaded into the TaskTracker.
>   3. Lower memory usage and contention in the TaskTracker.

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