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


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More MapReduce Interview Questions

What can be optimum value for Reducer?

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Explain what you understand by speculative execution

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Explain Working of MapReduce?

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What are ‘reduces’?

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Explain the general mapreduce algorithm

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What are the the issues associated with the map and reduce slots based mechanism in mapReduce?

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Explain the input type/format in mapreduce by default?

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What is identity mapper and identity reducer?

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What is Data Locality in Hadoop?

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What is SequenceFileInputFormat in Hadoop MapReduce?

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What are the four essential parameters of a mapper?

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What is the data storage component used by Hadoop?

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