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What is Combiner in Hadoop?


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More Hadoop General Interview Questions

What does the high availability of a name-node means? How is it accomplished?

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Explain what is storage and compute nodes?

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Ideally what should be the replication factor in hadoop?

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Clarify how job tracker schedules an assignment?

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Why can we not create directory /user/dataflair/inpdata001 when name node is in safe mode?

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Compare Hadoop and RDBMS?

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Define “speculative execution” in hadoop?

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Can you explain commodity hardware?

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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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Explain how can you debug hadoop code?

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What is the logistic regression?

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What happen on the namenode when a client tries to read a data file?

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