What is the difference between Reducer and Combiner in Hadoop MapReduce?
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Answer Posted / Reetu Rana
In Hadoop MapReduce, a Reducer combines the output of multiple Mappers to produce the final result for each key. A Combiner, on the other hand, performs a partial reduction of the data before it is sent to the reducer nodes. It helps optimize the performance by reducing the amount of data that needs to be transferred over the network.
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