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What is a combiner in hadoop?


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More Hadoop General Interview Questions

When we send a data to a node, do we allow settling in time, before sending another data to that node?

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What does rack awareness algorithm means?

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What does secondary name-node means?

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How often do you need to reformat the namenode?

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What is Mapper? How can we compress Mapper output in Hadoop?

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What is 'jps'?

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Have you ever used counters in hadoop?

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What is the use of context object?

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What is a Backup node in Hadoop?

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Is it possible to have hadoop job output in multiple directories? If yes, how?

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Clarify what is sqoop in hadoop?

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What is the role of the namenode?

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