Are job tracker and task trackers present in separate machines?

442

---

What is namenode?

453

---

what if job tracker machine is down?

442

---

What are the four basic parameters of a mapper?

530

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In which location name node sores its metadata and why?

652

---

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

579

---

How namenode handles data node failures?

502

---

What is the non dfs used?

514

---

How can one write custom record reader?

456

---

Whats the default port that jobtrackers listens ?

448

---

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

421

---

Is nosql follow relational db model?

420

---

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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