I am a newbie to Hadoop, I am trying to learn it and came across 2 versions of InputFormat.
org/apache/hadoop/mapred/InputFormat
org/apache/hadoop/mapreduce/InputFormat
The explanation of both apis seems to be same but one is interface and other is a class. Can someone please help me why there are 2 APIs with same explanation in Hadoop?
MapReduce has undergone a complete overhaul in hadoop-0.23 and it is called as MapReduce 2.0 (MRv2) or YARN.
org/apache/hadoop/mapred/InputFormat refers to hadoop MRV1
org/apache/hadoop/mapreduce/InputFormat refers to hadoop MRV2
Both these libraries refer to same functionality.
MRV2 is a rewrite of MRV1 for the compatibility of YARN architecture.
