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

505

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How often DataNode send heartbeat to NameNode in Hadoop?

586

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

559

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

578

---

What is Erasure Coding in Hadoop?

550

---

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

612

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

557

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

526

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Why do we need Hadoop?

569

---

What are the core components of Hadoop?

560

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What are the Features of Hadoop?

568

---

Compare Hadoop and RDBMS?

457

---

What are the modes in which Hadoop run?

557

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What are the features of Standalone (local) mode?

652

---

What are the features of Pseudo mode?

554

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