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

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What infrastructure do we need to process 100 TB data using Hadoop?

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Can the balancer be run while Hadoop is in use?

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Is a job split into maps?

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Who invented hadoop?

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Explain Erasure Coding in Apache Hadoop?

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How does an hadoop application look like or their basic components?

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

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What is a spill factor with respect to the ram?

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What mechanism does hadoop framework provides to synchronize changes made in distribution cache during runtime of the application?

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How will you make changes to the default configuration files?

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