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Why we cannot do aggregation (addition) in a mapper? Why we require reducer for that?


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More Apache Hadoop Interview Questions

What is a Record Reader in hadoop?

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How is hadoop different from other data processing tools?

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What is the purpose of RawComparator interface?

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Which are the two types of 'writes' in HDFS?

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What is the functionality of jobtracker in hadoop? How many instances of a jobtracker run on hadoop cluster?

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What is MapFile?

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Why is hadoop faster?

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What is Rack Awareness in Apache Hadoop?

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Have you ever used Counters in Hadoop. Give us an example scenario?

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Explain the wordcount implementation via hadoop framework ?

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Explain the hadoop configuration files at present?

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What is Input Split in hadoop?

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