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https://issues.apache.org/jira/browse/HADOOP-4668?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Owen O'Malley updated HADOOP-4668:
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Attachment: combiner-doc.patch
The patch updates the JavaDoc to document the restrictions on combiners.
> Improve JavaDoc on JobConf.setCombinerClass to better document restrictions
> on combiners
> ----------------------------------------------------------------------------------------
>
> Key: HADOOP-4668
> URL: https://issues.apache.org/jira/browse/HADOOP-4668
> Project: Hadoop Core
> Issue Type: Improvement
> Components: documentation
> Reporter: Owen O'Malley
> Assignee: Owen O'Malley
> Attachments: combiner-doc.patch
>
>
> It is often not clear to developers that Combiners may be called 0, 1, or
> many times and that combiners input and output types must be the same and the
> combiner must not have side effects. Since there isn't a Combiner class, the
> best place to put this documentation is on JobConf.setCombinerClass.
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