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what is "map" and what is "reducer" in Hadoop?


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More MapReduce Interview Questions

What is a RecordReader in Hadoop MapReduce?

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How is reporting controlled in hadoop?

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Explain the sequence of execution of all the components of MapReduce like a map, reduce, recordReader, split, combiner, partitioner, sort, shuffle.

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What is KeyValueTextInputFormat in Hadoop MapReduce?

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what job does the conf class do?

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What is LazyOutputFormat in MapReduce?

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What is Mapper in Hadoop MapReduce?

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MapReduce Types and Formats and Setting up a Hadoop Cluster?

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What can be optimum value for Reducer?

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What is shuffling in mapreduce?

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what daemons run on a master node and slave nodes?

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What is identity mapper and chain mapper?

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