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Posted to common-issues@hadoop.apache.org by "Robert Chansler (JIRA)" <ji...@apache.org> on 2009/10/08 20:59:31 UTC
[jira] Updated: (HADOOP-4842) Streaming combiner should allow
command, not just JavaClass
[ 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 combiner.)
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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