What is a Backup node in Hadoop?

563

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What do you mean by the NameNode High Availability in hadoop?

495

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What is the default replication factor in Hadoop and how will you change it?

592

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Why Hadoop performs replication, although it results in data redundancy?

1284

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What is Balancer in Hadoop?

473

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What is active and passive NameNode in Hadoop?

463

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How can one check whether NameNode is working or not?

544

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How would you restart NameNode?

425

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How NameNode tackle Datanode failures in Hadoop?

468

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Is Namenode machine same as DataNode machine as in terms of hardware in Hadoop?

438

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If DataNode increases, then do we need to upgrade NameNode in Hadoop?

455

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What is meant by streaming access?

550

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How to add/delete a Node to the existing cluster?

528

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What is Mapper in Hadoop?

562

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What is Reducer in Hadoop?

553

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