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Mapper and Reducer implementations can use the ________ to report progress or just indicate that they are alive.

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Mapper and Reducer implementations can use the ________ to report progress or just indicate that they are alive.

(a) Partitioner

(b) OutputCollector

(c) Reporter

(d) All of the mentioned
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Right option is (c) Reporter

For explanation I would say: Reporter is a facility for MapReduce applications to report progress, set application-level status messages and update Counters.
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