How to write a Custom Key Class?


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More Apache Hadoop Interview Questions

What are the default configuration files that are used in hadoop?

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Which command is used for the retrieval of the status of daemons running the hadoop cluster?

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What is IdentityMapper?

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How hdfa differs with nfs?

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How many Daemon processes run on a Hadoop system?

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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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How to resolve ioexception: cannot create directory, while formatting namenode in hadoop?

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What if a namenode has no data?

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What is the difference between rdbms and hadoop?

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What is MapFile?

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Which is the best hadoop certification?

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What is commodity hardware?

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