Hortonworks Exam HDPCD Topic 3 Question 23 Discussion

Actual exam question for Hortonworks's HDPCD exam

Question #: 23
Topic #: 3

[All HDPCD Questions]

Which best describes what the map method accepts and emits?

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 zero.

Show Suggested Answer

Suggested Answer: D

public class Mapper<KEYIN,VALUEIN,KEYOUT,VALUEOUT>

extends Object

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 output pairs.

Class Mapper<KEYIN,VALUEIN,KEYOUT,VALUEOUT>

by Mozell at Jun 26, 2022, 09:46 PM

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