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https://issues.apache.org/jira/browse/HADOOP-4842?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12682612#action_12682612
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Amareshwari Sriramadasu commented on HADOOP-4842:
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On a 10 node cluster, I ran a job(finding unique words in input) with and
without the combiner, runtimes are 1 min 40 sec and 5mins, 58sec repsectively.
> Streaming combiner should allow command, not just JavaClass
> -----------------------------------------------------------
>
> Key: HADOOP-4842
> URL: https://issues.apache.org/jira/browse/HADOOP-4842
> Project: Hadoop Core
> Issue Type: Improvement
> Components: contrib/streaming
> 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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