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Define a udf?


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More Hadoop General Interview Questions

Why we use intwritable instead of int? Why we use longwritable instead of long?

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What are some typical functions of Job Tracker?

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Can you explain bloommapfile.

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How can you set an arbitrary number of mappers to be created for a job in Hadoop?

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What is the best practice to deploy the secondary name node?

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What is a record reader?

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How often DataNode send heartbeat to NameNode in Hadoop?

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How many datanodes can run on a single Hadoop cluster?

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What are the differences between hadoop 1 and hadoop 2?

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

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What is throughput in Hadoop?

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How is security achieved in Hadoop?

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