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


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More Apache Hadoop Interview Questions

How blocks are distributed among all data nodes for a particular chunk of data?

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What does /var/hadoop/pids do?

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How do you categorize a big data?

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What is Hadoop serialization?

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What are the network requirements for using hadoop?

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Does Hadoop requires RAID?

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What are channel selectors?

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What do you know by storage and compute node?

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What is the sequencefileinputformat in hadoop?

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What are the functions of NameNode?

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What is Apache Hadoop? Why is Hadoop essential for every Big Data application?

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Explain the shuffle?

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