Are job tracker and task trackers present in separate machines?

462

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What is namenode?

482

---

what if job tracker machine is down?

473

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What are the four basic parameters of a mapper?

567

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In which location name node sores its metadata and why?

672

---

What are input format, input split & record reader and what they do?

623

---

How namenode handles data node failures?

524

---

What is the non dfs used?

551

---

How can one write custom record reader?

486

---

Whats the default port that jobtrackers listens ?

479

---

Do we need to place 2nd and 3rd data in rack 2 only?

443

---

Is nosql follow relational db model?

467

---

What are the different clustering in mahout?

39

---

What does apache mahout do?

57

---

What is the difference between apache mahout and apache spark’s mllib?

37

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