How to exit the vi editor?

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Explain how do ‘map’ and ‘reduce’ works?

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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 a Combiner?

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How can you connect an application

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What do you know about keyvaluetextinputformat?

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What is the functionality of jobtracker in hadoop?

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What if a namenode has no data?

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Can we do online transactions(oltp) using hadoop?

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Explain the features of pseudo mode?

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Define streaming?

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Define a metadata?

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