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CCD-333 · Question #23

Combiners Increase the efficiency of a MapReduce program because:

The correct answer is C. They aggregate intermediate map output locally on each individual machine and therefore. Cloudera CCD-333 Exam

HBase Performance Tuning

Question

Combiners Increase the efficiency of a MapReduce program because:

Options

AThey provide a mechanism for different mappers to communicate with each Other, thereby
BThey provide an optimization and reduce the total number of computations that are needed to
CThey aggregate intermediate map output locally on each individual machine and therefore
DThey aggregate intermediate map output horn a small number of nearby (i.e., rack-local)

How the community answered

(35 responses)

A
3% (1)
B
14% (5)
C
77% (27)
D
6% (2)

Explanation

Cloudera CCD-333 Exam

Topics

#combiners#MapReduce optimization#local aggregation#intermediate output

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