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How often DataNode send heartbeat to NameNode in Hadoop?


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More Hadoop General Interview Questions

Is it possible to have hadoop job output in multiple directories?

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What does hadoop-env.sh do?

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What a task tracker is in hadoop?

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Hadoop achieves parallelism by dividing the tasks across many nodes, it is possible for a few slow nodes to rate-limit the rest of the program and slow down the program. What mechanism Hadoop provides to combat this?

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Which object can be used to get the progress of a particular job

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

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Mention what are the most common input formats defined in hadoop?

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Compare Hadoop and RDBMS?

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Explain Erasure Coding in Hadoop?

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What are the limitations of Hadoop?

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What are the side data distribution techniques?

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What is replication factor?

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