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From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-4668) Improve JavaDoc on JobConf.setCombinerClass to better document restrictions on combiners
Date Sun, 16 Nov 2008 23:18:44 GMT
Improve JavaDoc on JobConf.setCombinerClass to better document restrictions on combiners
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                 Key: HADOOP-4668
                 URL: https://issues.apache.org/jira/browse/HADOOP-4668
             Project: Hadoop Core
          Issue Type: Improvement
            Reporter: Owen O'Malley
            Assignee: Owen O'Malley


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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