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

464

---

How often DataNode send heartbeat to NameNode in Hadoop?

536

---

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

519

---

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

532

---

What is Erasure Coding in Hadoop?

506

---

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

---

What are the core components of Hadoop?

508

---

What are the Features of Hadoop?

511

---

Compare Hadoop and RDBMS?

408

---

What are the modes in which Hadoop run?

503

---

What are the features of Standalone (local) mode?

594

---

What are the features of Pseudo mode?

501

---