Which best describes what the map method accepts and emits?

The correct answer is D. It accepts a single key-value pairs as input and can emit any number of key-value pair as output, including. public class Mapper<KEYIN,VALUEIN,KEYOUT,VALUEOUT> Maps input key/value pairs to a set of intermediate key/value pairs. Maps are the individual tasks which transform input records into a intermediate records. The transformed intermediate records need not be of the same type as…

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Question

Options

AIt accepts a single key-value pair as input and emits a single key and list of corresponding values as output.
BIt accepts a single key-value pairs as input and can emit only one key-value pair as output.
CIt accepts a list key-value pairs as input and can emit only one key-value pair as output.
DIt accepts a single key-value pairs as input and can emit any number of key-value pair as output, including

How the community answered

(51 responses)

A
6% (3)
B
16% (8)
C
4% (2)
D
75% (38)

Explanation

public class Mapper<KEYIN,VALUEIN,KEYOUT,VALUEOUT> Maps input key/value pairs to a set of intermediate key/value pairs. Maps are the individual tasks which transform input records into a intermediate records. The transformed intermediate records need not be of the same type as the input records. A given input pair may map to zero or many

Topics

#map function#key-value pairs#input/output contract#MapReduce

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