Question

How is the map stage of the sorting problem different from the searching problem in MapReduce?

a.

Sorting maps only emit matching lines.

b.

Sorting maps emit everything (identity map).

c.

Sorting maps partition input for each reducer.

d.

Sorting maps require the use of reduce() function.

Posted under Big Data Computing

Answer: (b).Sorting maps emit everything (identity map). Explanation:In the sorting problem in MapReduce, the map stage emits everything (identity map) by default, and sorting is performed during the reduce stage.

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