How often DataNode send heartbeat to NameNode in Hadoop?

501

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

465

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

491

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What is Erasure Coding in Hadoop?

450

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

515

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

468

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

432

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Why do we need Hadoop?

491

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What are the core components of Hadoop?

457

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What are the Features of Hadoop?

461

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Compare Hadoop and RDBMS?

386

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What are the modes in which Hadoop run?

457

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What are the features of Standalone (local) mode?

544

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What are the features of Pseudo mode?

457

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What are the features of Fully-Distributed mode?

445

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