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


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More MapReduce Interview Questions

What happens when a datanode fails ?

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Explain what are the basic parameters of a mapper?

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Explain about the partitioning, shuffle and sort phase

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How to compress mapper output in Hadoop?

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What is mapper in map reduce?

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what are the most common input formats defined in Hadoop?

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

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What are the various input and output types supported by mapreduce?

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What is a RecordReader in Hadoop MapReduce?

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What are advantages of Spark over MapReduce?

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What are the configuration parameters in the 'MapReduce' program?

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What is the sequence of execution of Mapper, Combiner, and Partitioner in MapReduce?

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