Question

Point out the correct statement.

(a) Mapper maps input key/value pairs to a set of intermediate key/value pairs

(b) Applications typically implement the Mapper and Reducer interfaces to provide the map and reduce methods

(c) Mapper and Reducer interfaces form the core of the job

(d) None of the mentioned

The question was posed to me during an interview for a job.

I would like to ask this question from Mapreduce Development topic in section Developing a MapReduce Application of Hadoop

Answer 1

The correct option is (d) None of the mentioned

The explanation is: The transformed intermediate records do not need to be of the same type as the input records.