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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4668) Improve JavaDoc on JobConf.setCombinerClass to better document restrictions on combiners
Date Fri, 21 Nov 2008 16:29:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4668?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12649700#action_12649700
] 

Hudson commented on HADOOP-4668:
--------------------------------

Integrated in Hadoop-trunk #667 (See [http://hudson.zones.apache.org/hudson/job/Hadoop-trunk/667/])
    . Improve documentation for setCombinerClass to clarify the
restrictions on combiners. (omalley)


> 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
>             Fix For: 0.20.0
>
>         Attachments: combiner-doc.patch, 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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