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what is "map" and what is "reducer" in Hadoop?


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More MapReduce Interview Questions

How to set the number of reducers?

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

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How to write MapReduce Programs?

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What is the next step after Mapper or MapTask?

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What is Text Input Format?

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What is MapReduce? What are the syntax you use to run a MapReduce program?

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Explain the features of Apache Spark because of which it is superior to Apache MapReduce?

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Explain how mapreduce works.

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What does a 'MapReduce Partitioner' do?

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What is Counter in MapReduce?

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What is the default value of map and reduce max attempts?

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What is the difference between RDBMS with Hadoop MapReduce?

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