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Users can control which keys (and hence records) go to which Reducer by implementing a custom?

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Users can control which keys (and hence records) go to which Reducer by implementing a custom?

(a) Partitioner

(b) OutputSplit

(c) Reporter

(d) All of the mentioned

The question was posed to me by my college professor while I was bunking the class.

My question is based upon Mapreduce Development topic in chapter Developing a MapReduce Application of Hadoop

1 Answer

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Best answer
Right option is (a) Partitioner

The best explanation: Users can control the grouping by specifying a Comparator via JobConf.setOutputKeyComparatorClass(Class).

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