Explain what combiners are and when you should use a combiner in a mapreduce job?


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More MapReduce Interview Questions

mapper or reducer?

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What do you understand by compute and storage nodes?

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What can be optimum value for Reducer?

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what job does the conf class do?

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What happen if the number of the reducer is 0 in MapReduce?

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Explain combiners.

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Why comparison of types is important for MapReduce?

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How to submit extra files(jars,static files) for MapReduce job during runtime in Hadoop?

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Clarify what combiners are and when you should utilize a combiner in a map reduce job?

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What is Reduce only jobs?

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List out Hadoop's three configuration files?

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Explain the Reducer's Sort phase?

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