Nathan Jarus created MAPREDUCE-4523:
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Summary: DBOutputFormat cannot be easily subclassed
Key: MAPREDUCE-4523
URL: https://issues.apache.org/jira/browse/MAPREDUCE-4523
Project: Hadoop Map/Reduce
Issue Type: Improvement
Affects Versions: 0.20.205.0
Reporter: Nathan Jarus
Priority: Minor
In DBOutputFormat#setOutput(), job.setOutputFormat(DBOutputFormat.class) is
called. When subclassing DBOutputFormat, this function must be overridden to
call job.setOutputFormat(SubclassedDBOutputFormat.class), otherwise the custom
subclass is never called. This is pretty unobvious at first glance, especially
since most examples tell you to explicitly call job.setOutputFormat() in your
setup function.
I'm not sure this call is necessary in DBOutputFormat#setOutput() at all, given
that it's unnecessary if people follow the examples and that it makes
subclassing DBOutputFormat trickier than it should be.
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