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The framework groups Reducer inputs by key in _________ stage.

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The framework groups Reducer inputs by key in _________ stage.

(a) sort

(b) shuffle

(c) reduce

(d) none of the mentioned

The question was asked in an online interview.

Enquiry is from Mapreduce Development in section Developing a MapReduce Application of Hadoop

1 Answer

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Best answer
The correct answer is (a) sort

The best I can explain: The shuffle and sort phases occur simultaneously; while map-outputs are being fetched they are merged.

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