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What is a IdentityMapper and IdentityReducer in MapReduce ?


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More MapReduce Interview Questions

What is the key- value pair in Hadoop MapReduce?

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How is reporting controlled in hadoop?

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Explain combiners.

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How to set mappers and reducers for MapReduce jobs?

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how indexing in HDFS is done?

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Why comparison of types is important for MapReduce?

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Is it legal to set the number of reducer task to zero? Where the output will be stored in this case?

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what is distributed cache in mapreduce framework?

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What do you understand by the term Straggler ?

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Define speculative execution?

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Explain what are the basic parameters of a mapper?

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How to write a custom partitioner for a Hadoop MapReduce job?

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