What mode(s) can hadoop code be run in?

455

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How often do you need to reformat the namenode?

511

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What is the role of the namenode?

441

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What happen on the namenode when a client tries to read a data file?

457

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What is replication factor?

431

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If the hadoop administrator needs to make a change, which configuration file does he need to change?

442

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What is distributed copy (distcp)?

481

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What is the role of the secondary namenode?

441

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Are there any special requirements for namenode?

423

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is there a standard procedure to deploy hadoop?

423

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What happen if a datanode loses network connection for a few minutes?

587

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What is the procedure for namenode recovery?

452

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How would an hadoop administrator deploy various components of hadoop in production?

422

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

424

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

459

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