Question

Point out the wrong statement.

(a) A MapReduce job usually splits the input data-set into independent chunks which are processed by the map tasks in a completely parallel manner

(b) The MapReduce framework operates exclusively on <key, value> pairs

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

(d) None of the mentioned

I have been asked this question at a job interview.

I would like to ask this question from Introduction to Mapreduce in section Mapreduce of Hadoop

Answer 1

Right answer is (d) None of the mentioned

Explanation: The MapReduce framework takes care of scheduling tasks, monitoring them and re-executes the failed tasks.