Question

How are key-value pairs processed in the reduce() function in the MapReduce model?

a.

They are divided into two stages.

b.

They are grouped by keys and processed.

c.

They are computed by the map() function.

d.

They are emitted by the map() function.

Posted under Big Data Computing

Answer: (b).They are grouped by keys and processed. Explanation:Key-value pairs generated by the map() function are grouped by keys and processed in the reduce() function.

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