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Can you explain how do ‘map’ and ‘reduce’ work?


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More Apache Hadoop Interview Questions

What are the functionalities of jobtracker?

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Can Hadoop be compared to NOSQL database like Cassandra?

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How many instances of a jobtracker run on hadoop cluster?

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Can you explain how do ‘map’ and ‘reduce’ work?

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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 NoSQL?

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What is the meaning of the term "non-DFS used" in Hadoop web-console?

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What is output format in hadoop?

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shouldn't DFS be able to handle large volumes of data already?

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Define a metadata?

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Explain what is sqoop in Hadoop ?

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What happens in a textinputformat?

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