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    1) New API using Mapper and Reducer as class. Where as old api used mapper and reducer as interface.

    2) New API is in the org.apache.hadoop.mapreduce package where as old API can still be found in org.apache.hadoop.mapred.

    3) Job Control is done through the JOB class in new API. Job Control was done through JobClient

    4) In the new API, the reduce() method passes values as a java.lang.iterable, where as in the old API, the reducer() method passes values as a java.lang.Iterator.

    Reference Link:

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