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Explain what is “map” and what is "reducer" in hadoop?


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More MapReduce Interview Questions

what is the Hadoop MapReduce APIs contract for a key and value class?

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Different ways of debugging a job in MapReduce?

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Clarify what is shuffling in map reduce?

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How data is spilt in Hadoop?

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What are the main components of MapReduce Job?

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How to create a custom key and custom value in MapReduce Job?

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Define the Use of MapReduce?

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When is it suggested to use a combiner in a MapReduce job?

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What are combiners? When should I use a combiner in my MapReduce Job?

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When is it not recommended to use MapReduce paradigm for large

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What is the difference between Job and Task in MapReduce?

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What is Shuffling and Sorting in a MapReduce?

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