How often DataNode send heartbeat to NameNode in Hadoop?

536

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

517

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

532

---

What is Erasure Coding in Hadoop?

506

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

563

---

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

513

---

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

471

---

Why do we need Hadoop?

520

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What are the core components of Hadoop?

507

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What are the Features of Hadoop?

511

---

Compare Hadoop and RDBMS?

408

---

What are the modes in which Hadoop run?

502

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What are the features of Standalone (local) mode?

593

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What are the features of Pseudo mode?

501

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What are the features of Fully-Distributed mode?

492

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