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

458

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Give me the examples of Columnar database ?

591

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

426

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What is Fault Tolerance?

539

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What is the basic difference between traditional RDBMS and Hadoop?

449

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What are the common types of NOSQL data bases ?

449

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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?

434

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How does speculative execution work in Hadoop?

441

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What is Federation?

422

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What is the difference between TextInputFormat and KeyValueInputFormat class?

502

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What is High Availability feature in Hadoop2?

447

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What is the command to change the replication factor ?

508

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What is JobTracker?

441

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How many datanodes can run on a single Hadoop cluster?

457

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What are some typical functions of Job Tracker?

429

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