Assuming default settings, which best describes the order of data provided to a reducer’s reduce method:

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asked Aug 10, 2016 in CCD 410 Cloudera Certified Developer for Apache Hadoop (CCDH) by John Hayes (470 points)
retagged Aug 14, 2016 by admin
Assuming default settings, which best describes the order of data provided to a reducer’s reduce method:

A. The keys given to a reducer aren’t in a predictable order, but the values associated with those keys always are.
B. Both the keys and values passed to a reducer always appear in sorted order.
C. Neither keys nor values are in any predictable order.
D. The keys given to a reducer are in sorted order but the values associated with each key are in no predictable order

1 Answer

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answered Aug 10, 2016 by Sandra Reeds (1,040 points)

Answer: D

D. The keys given to a reducer are in sorted order but the values associated with each key are in no predictable order

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