Question: In the MapReduce framework, for performing a parallel computation, a crucial step involves an input that consists of a set of n key-value pairs, (k,

In the MapReduce framework, for performing a parallel computation, a crucial step involves an input that consists of a set of n key-value pairs, (k, v), for which we need to collect each subset of key-value pairs that have the same key, k, into a single file. Describe an efficient external-memory algorithm for constructing all such files. How many disk transfers does your algorithm perform?

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