How will you write a custom partitioner for a Hadoop job?

450

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Give me the examples of Columnar database ?

582

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

419

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What is Fault Tolerance?

531

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What is the basic difference between traditional RDBMS and Hadoop?

441

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What are the common types of NOSQL data bases ?

445

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

430

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How does speculative execution work in Hadoop?

431

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What is Federation?

413

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What is the difference between TextInputFormat and KeyValueInputFormat class?

497

---

What is High Availability feature in Hadoop2?

440

---

What is the command to change the replication factor ?

501

---

What is JobTracker?

435

---

How many datanodes can run on a single Hadoop cluster?

448

---

What are some typical functions of Job Tracker?

426

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