Which are the methods in the mapper interface?

686

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What is a namenode? How many instances of namenode run on a hadoop cluster?

692

---

What do you mean by taskinstance?

798

---

How hdfa differs with nfs?

788

---

How a task is scheduled by a jobtracker?

718

---

How many maximum jvm can run on a slave node?

728

---

What are the two main parts of the hadoop framework?

703

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What is the use of combiners in the hadoop framework?

650

---

What is the jobtracker?

678

---

What is the jobtracker and what it performs in a hadoop cluster?

666

---

How many instances of tasktracker run on a hadoop cluster?

728

---

Explain the use of tasktracker in the hadoop cluster?

680

---

How does a namenode handle the failure of the data nodes?

737

---

How is spark sql different from hql and sql?

283

---

Is there a module to implement sql in spark? How does it work?

306

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