What happen if one of the datanodes has much slower cpu?

389

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After increasing the replication level, I still see that data is under replicated. What could be wrong?

429

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Web-ui shows that half of the datanodes are in decommissioning mode. What does that mean? Is it safe to remove those nodes from the network?

422

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What is the difference between a hadoop database and relational database?

426

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Can we deploye job tracker other than name node?

633

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What is difference between secondary namenode, checkpoint namenode & backupnode?

442

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Name the most common input formats defined in hadoop?

414

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Which one is default?

449

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Is it possible to have hadoop job output in multiple directories?

411

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What is tasktracker in hadoop?

402

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What is a combiner in hadoop?

486

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Have you ever used counters in hadoop?

400

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What are some typical functions of job tracker in hadoop?

396

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Can you define inputsplit in hadoop?

432

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What daemons run on master nodes?

447

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