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What is identity mapper and identity reducer?


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More MapReduce Interview Questions

What is the need of MapReduce?

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Define Writable data types in MapReduce?

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Explain the Reducer's Sort phase?

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Explain combiners.

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What is a RecordReader in Hadoop MapReduce?

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Which one will you decide for an undertaking – Hadoop MapReduce or Apache Spark?

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What is a mapreduce algorithm?

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What are the four basic parameters of a reducer?

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Which are the methods in the mapper interface?

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what is a Task Tracker in Hadoop?

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How to set the number of mappers for a MapReduce job?

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