What is a MapReduce Combiner?


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More MapReduce Interview Questions

What is the role of a MapReduce partitioner?

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what are the three modes in which Hadoop can be run?

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What is RecordReader in a Map Reduce?

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How to create a custom key and custom value in MapReduce Job?

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what is JobTracker in Hadoop? What are the actions followed by Hadoop?

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How to set the number of reducers?

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What is a TaskInstance?

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What combiners is and when you should use a combiner in a MapReduce Job?

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Explain the Reducer's Sort phase?

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What is identity mapper and chain mapper?

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What main configuration parameters are specified in mapreduce?

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What is a map side join?

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