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


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More MapReduce Interview Questions

Explain what combiners are and when you should use a combiner in a mapreduce job?

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What are mapreduce new and old apis while writing map reduce program?. Explain how it works

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Why is Apache Spark faster than Hadoop MapReduce?

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Explain what are the basic parameters of a mapper?

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What are ‘maps’ and ‘reduces’?

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What comes in Hadoop 2.0 and MapReduce V2 YARN

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

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What is Shuffling and Sorting in a MapReduce?

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What is heartbeat in hdfs? Explain.

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How do you stop a running job gracefully?

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What is the utility of using Writable Comparable Custom Class in Map Reduce code?

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How to specify more than one directory as input to the MapReduce Job?

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