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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 Sun, 15 Apr 2007 06:29:15 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-968?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12488920
] 

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

-1, build or testing failed

2 attempts failed to build and test the latest attachment http://issues.apache.org/jira/secure/attachment/12355549/968.apr14.patch
against trunk revision r528230.

Test results:   http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/50/testReport/
Console output: http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/50/console

Please note that this message is automatically generated and may represent a problem with
the automation system and not the patch.

> 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.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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