What are the common types of NOSQL data bases ?

454

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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?

439

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How does speculative execution work in Hadoop?

442

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What is Federation?

423

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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 ?

509

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What is JobTracker?

441

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How many datanodes can run on a single Hadoop cluster?

458

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What are some typical functions of Job Tracker?

433

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What is TaskTracker?

489

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Give a brief overview of Hadoop history?

430

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How Big is ‘Big Data’?

431

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How can you set an arbitrary number of mappers to be created for a job in Hadoop?

462

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How many job tracker processes can run on a single Hadoop cluster?

479

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