For each input key-value pair, mappers can emit:

The correct answer is E. As many intermediate key-value pairs as designed, as long as all the keys have the same types and. Mapper maps input key/value pairs to a set of intermediate key/value pairs. Maps are the individual tasks that transform input records into intermediate records. The transformed intermediate records do not need to be of the same type as the input records. A given input pair may…

Developing with Apache Spark Core

Question

Options

AAs many intermediate key-value pairs as designed.
BAs many intermediate key-value pairs as designed, but they cannot be of the same type as the input
COne intermediate key-value pair, of a different type.
DOne intermediate key-value pair, but of the same type.
EAs many intermediate key-value pairs as designed, as long as all the keys have the same types and

How the community answered

(41 responses)

A
12% (5)
B
2% (1)
C
2% (1)
D
5% (2)
E
78% (32)

Explanation

Mapper maps input key/value pairs to a set of intermediate key/value pairs. Maps are the individual tasks that transform input records into intermediate records. The transformed intermediate records do not need to be of the same type as the input records. A given input pair may map to zero or many output pairs.

Topics

#mapper output#intermediate key-value pairs#MapReduce API#emit

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