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Which of the following partitions the key space?

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Which of the following partitions the key space?

(a) Partitioner

(b) Compactor

(c) Collector

(d) All of the mentioned

This question was addressed to me in unit test.

The query is from MapReduce Features in portion Developing a MapReduce Application of Hadoop

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Right option is (a) Partitioner

For explanation: Partitioner controls the partitioning of the keys of the intermediate map-outputs.

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