Remove the need for users to specify the types of the inputs
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Key: HADOOP-450
URL: http://issues.apache.org/jira/browse/HADOOP-450
Project: Hadoop
Issue Type: Improvement
Components: mapred
Affects Versions: 0.5.0
Reporter: Owen O'Malley
Assigned To: Owen O'Malley
Fix For: 0.6.0
Currently, the application specifies the types of the input keys and values and
the RecordReader checks them for consistency. It would make more sense to have
the RecordReader define the types of keys that it will produce. Therefore, I
propose that we add two new methods to RecordReader:
WritableComparable createKey();
Writable createValue();
Note that I propose adding them to the RecordReader rather than the
InputFormat, so that they can specific to a particular input split.
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