Question

Point out the correct statement.

(a) You can specify any executable as the mapper and/or the reducer

(b) You cannot supply a Java class as the mapper and/or the reducer

(c) The class you supply for the output format should return key/value pairs of Text class

(d) All of the mentioned

I got this question by my school teacher while I was bunking the class.

My question is taken from Hadoop Streaming topic in portion Mapreduce of Hadoop

Answer 1

Correct choice is (a) You can specify any executable as the mapper and/or the reducer

The explanation: If you do not specify an input format class, the TextInputFormat is used as the default.