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What is Rack awareness?


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More Apache Hadoop Interview Questions

What is safe mode in Hadoop?

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What is the use of Combiner?

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What are the additional benefits YARN brings in to Hadoop?

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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 problems have you faced when you are working on Hadoop code?

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Data Engineer Given a list of followers in the format:123, 345234, 678345, 123…Where column one is the ID of the follower and column two is the ID of the followee. Find all mutual following pairs (the pair 123, 345 in the example above). How would you use Map/Reduce to solve the problem when the list does not fit in memory?

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What is the problem with small files in Apache Hadoop?

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How is hadoop different from other data processing tools?

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What does job conf class do?

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What exactly is hadoop?

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What are active and passive "NameNodes"?

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Rack awareness of Namenode?

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