Give me the examples of Columnar database ?

623

---

What are 'slaves' and 'masters' in Hadoop?

473

---

What is Fault Tolerance?

566

---

What is the basic difference between traditional RDBMS and Hadoop?

477

---

What are the common types of NOSQL data bases ?

481

---

Is it possible to provide multiple input to Hadoop? If yes then how can you give multiple directories as input to the Hadoop job?

465

---

How does speculative execution work in Hadoop?

480

---

What is Federation?

457

---

What is the difference between TextInputFormat and KeyValueInputFormat class?

540

---

What is High Availability feature in Hadoop2?

475

---

What is the command to change the replication factor ?

546

---

What is JobTracker?

477

---

How many datanodes can run on a single Hadoop cluster?

482

---

What are some typical functions of Job Tracker?

471

---

What is TaskTracker?

517

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