What is NameNode? How NameNode tackle Datanode failures in Hadoop?

472

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How often DataNode send heartbeat to NameNode in Hadoop?

547

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

527

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What is Rack Awareness? What is its need in Hadoop?

540

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What is Erasure Coding in Hadoop?

516

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Why do we need Hadoop Archives? How is it created?

571

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What is Slot in Hadoop v1? Why was it removed from Hadoop v2?

520

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What is CAP Theorem? What aspects does Hadoop support from this theorem?

483

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Why do we need Hadoop?

531

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What are the core components of Hadoop?

512

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What are the Features of Hadoop?

518

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Compare Hadoop and RDBMS?

416

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What are the modes in which Hadoop run?

515

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What are the features of Standalone (local) mode?

602

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What are the features of Pseudo mode?

512

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