Question

Point out the wrong statement.

(a) If V2 and V3 are the same, you only need to use setOutputValueClass()

(b) The overall effect of Streaming job is to perform a sort of the input

(c) A Streaming application can control the separator that is used when a key-value pair is turned into a series of bytes and sent to the map or reduce process over standard input

(d) None of the mentioned

I had been asked this question in an international level competition.

My question is based upon Mapreduce Types topic in chapter MapReduce Types and Formats of Hadoop

Answer 1

The correct answer is (d) None of the mentioned

Explanation: If a combine function is used then it is the same form as the reduce function, except its output types are the intermediate key and value types (K2 and V2), so they can feed the reduce function.