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What is the purpose of RawComparator interface?


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More Apache Hadoop Interview Questions

Explain the shuffle?

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Explain the overview of hadoop history breifly?

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What are the different methods to run Spark over Apache Hadoop?

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What do slaves consist of?

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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 are different hdfs dfs shell commands to perform copy operation?

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Explain the wordcount implementation via hadoop framework ?

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On what basis name node distribute blocks across the data nodes?

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Whats is distributed cache in hadoop?

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What is safe mode in Hadoop?

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What is unstructured data?

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What is the use of Combiner?

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