hadoop - Interface InputFormat vs Class InputFormat -

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i newbie hadoop, trying learn , came across 2 versions of inputformat.

org/apache/hadoop/mapred/inputformat

org/apache/hadoop/mapreduce/inputformat

the explanation of both apis seems same 1 interface , other class. can please me why there 2 apis same explanation in hadoop?

mapreduce has undergone complete overhaul in hadoop-0.23 , called mapreduce 2.0 (mrv2) or yarn.

org/apache/hadoop/mapred/inputformat refers hadoop mrv1

org/apache/hadoop/mapreduce/inputformat refers hadoop mrv2

both these libraries refer same functionality.

mrv2 rewrite of mrv1 compatibility of yarn architecture.


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