What data does a Reducer reduce method process?
A) All the data in a single input file.
B) All data produced by a single mapper.
C) All data for a given key, regardless of which mapper(s) produced it.
D) All data for a given value, regardless of which mapper(s) produced it.

Question

Quizplus · Accepted Answer

The Reducer reduce method processes all data associated with a particular key, aggregating results from all mappers that produced data for that key.

What Data Does a Reducer Reduce Method Process