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What is identity mapper and identity reducer?


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More MapReduce Interview Questions

Explain combiners.

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What is an input reader in reference to mapreduce?

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When should you use a reducer?

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What is the Job interface in MapReduce framework?

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What counter in Hadoop MapReduce?

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How to overwrite an existing output file/dir during execution of Hadoop MapReduce jobs?

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What is Hadoop Map Reduce ?

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What is the function of mapreduce partitioner?

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In MapReduce, ideally how many mappers should be configured on a slave?

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What is a partitioner and how the user can control which key will go to which reducer?

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Explain the process of spilling in Hadoop MapReduce?

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what does the conf.setMapper Class do ?

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