Hortonworks Exam HDPCD Topic 3 Question 25 Discussion

Actual exam question for Hortonworks's HDPCD exam

Question #: 25
Topic #: 3

In a large MapReduce job with m mappers and n reducers, how many distinct copy operations will there be in the sort/shuffle phase?

AmXn (i.e., m multiplied by n)

Dm+n (i.e., m plus n)

Emn (i.e., m to the power of n)

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Suggested Answer: A

A MapReduce job with m mappers and r reducers involves up to m * r distinct copy operations, since each mapper may have intermediate output going to every reducer.

by Noah at Jul 31, 2022, 08:21 AM

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