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

500

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Give me the examples of Columnar database ?

628

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

477

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What is Fault Tolerance?

570

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What is the basic difference between traditional RDBMS and Hadoop?

483

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What are the common types of NOSQL data bases ?

484

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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?

474

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How does speculative execution work in Hadoop?

487

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What is Federation?

464

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What is the difference between TextInputFormat and KeyValueInputFormat class?

546

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What is High Availability feature in Hadoop2?

482

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What is the command to change the replication factor ?

551

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What is JobTracker?

482

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How many datanodes can run on a single Hadoop cluster?

487

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What are some typical functions of Job Tracker?

481

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