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From "Robert Chansler (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-4842) Streaming combiner should allow command, not just JavaClass
Date Thu, 08 Oct 2009 18:59:31 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-4842?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Robert Chansler updated HADOOP-4842:

    Release Note: Streaming option -combiner allows any streaming command (not just Java class)
to be a combiner.  (was: -combiner option in steaming allows any streaming command to be a

Editorial pass over all release notes prior to publication of 0.21.

> Streaming combiner should allow command, not just JavaClass
> -----------------------------------------------------------
>                 Key: HADOOP-4842
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4842
>             Project: Hadoop Common
>          Issue Type: Improvement
>            Reporter: Marco Nicosia
>            Assignee: Amareshwari Sriramadasu
>             Fix For: 0.21.0
>         Attachments: patch-4842-1.txt, patch-4842-2.txt, patch-4842-3.txt, patch-4842.txt
> Streaming jobs are way slower than Java jobs for many reasons, but certainly stopping
the shell-only programmer from using the combiner feature won't help. Right now, the streaming
usage says:
> {quote}
>   -mapper   <cmd|JavaClassName>      The streaming command to run
>   -combiner <JavaClassName> Combiner has to be a Java class
>   -reducer  <cmd|JavaClassName>      The streaming command to run
> {quote}

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