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MapReduce, mail # user - InputFormat in mapred vs. mapreduce.

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InputFormat in mapred vs. mapreduce.
Jane Chen 2010-12-06, 21:35
In Hadoop 0.21, I found InputFormat as an Interface in package mapred, and as an abstract class in package mapreduce.  The APIs are slightly different.  Which one should I choose to extend from or implement?  How are the two packages intended to be used differently?