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MongoDB applies the _____ phase to each input document in mapreduce.

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MongoDB applies the _____ phase to each input document in mapreduce.

(a) map

(b) reduce

(c) mapper

(d) all of the mentioned

I got this question during an interview.

The question is from Map-Reduce topic in portion Aggregation Concepts and Aggregation Mechanics of MongoDB

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Best answer
The correct option is (a) map

To elaborate: The map function emits key-value pairs.

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