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What is the purpose of RawComparator interface?


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More Apache Hadoop Interview Questions

What are the modules that constitute the Apache Hadoop 2.0 framework?

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What is InputSplit and RecordReader?

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

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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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What is Rack Awareness in Apache Hadoop?

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What Mapper does?

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What are the network requirements for using hadoop?

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Explain the Job OutputFormat?

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What is salary of hadoop developer?

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What is difference between secondary namenode, checkpoint namenode & backupnod secondary namenode, a poorly named component of hadoop?

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What is a Secondary Namenode? Is it a substitute to the Namenode?

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Can we do online transactions(oltp) using hadoop?

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