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What are the identity mapper and reducer in MapReduce?


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More MapReduce Interview Questions

What does a 'MapReduce Partitioner' do?

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

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Describe what happens to a mapreduce job from submission to output?

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What is the role of recordreader in hadoop mapreduce?

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What is the relationship between Job and Task in Hadoop?

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what is NameNode in Hadoop?

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What do sorting and shuffling do?

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How can we control particular key should go in a specific reducer?

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What is partitioner and its usage?

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Is it possible to rename the output file?

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Is it important for Hadoop MapReduce jobs to be written in Java?

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How do Hadoop MapReduce works?

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