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Why aggregation cannot be done in Mapper?


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More Hadoop General Interview Questions

How can you set an arbitrary number of Reducers to be created for a job in Hadoop?

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If no custom partitioner is defined in Hadoop then how is data partitioned before it is sent to the reducer?

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Compare Hadoop 2 and Hadoop 3?

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What do you know about yarn?

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What do you understand by standalone (or local) mode?

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Explain what is storage and compute nodes?

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After the Map phase finishes, the Hadoop framework does 'Partitioning, Shuffle and sort'. Explain what happens in this phase?

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Explain what is sequencefileinputformat?

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Give me the examples of Columnar database ?

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How Hadoop is cost-effective?

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Mention what are the three modes in which hadoop can be run?

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If datanodes increase, then do we need to upgrade namenode?

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