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how many distinct copy operations will there be in the sort/shuffle phase?

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

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A.
m

B.
r

C.
m+r (i.e., m plus r)

D.
mxr (i.e., m multiplied by r)

E.
mr (i.e., m to the power of r)

Explanation:
A MapReduce job withm mappers and r reducers involves up to m*r distinct copy
operations, since eachmapper may have intermediate output going to every reducer.

4 Comments on “how many distinct copy operations will there be in the sort/shuffle phase?

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