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Explain what is “map” and what is "reducer" in hadoop?


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More MapReduce Interview Questions

When is it not recommended to use MapReduce paradigm for large

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Clarify what is shuffling in map reduce?

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Why is Apache Spark faster than Hadoop MapReduce?

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What is identity mapper and identity reducer?

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What are the primary phases of a Reducer?

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how indexing in HDFS is done?

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what are the most common input formats defined in Hadoop?

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Explain what does the conf.setmapper class do?

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Explain combiners.

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How to overwrite an existing output file during execution of mapreduce jobs?

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What is a map side join?

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What happens when a datanode fails ?

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