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Class org.apache.hadoop.mapred.lib.IdentityReducer

Removed interface org.apache.hadoop.mapred.Reducer.
Added interface org.apache.hadoop.mapred.Reducer.

Now deprecated.

Changed Methods
void reduce(Object, Iterator, OutputCollector, Reporter) Change in signature from (K, Iterator, OutputCollector, Reporter) to (Object, Iterator, OutputCollector, Reporter).
 Writes all keys and values directly to output.
 

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