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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