Explain Erasure Coding in Hadoop?

503

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What is Disk Balancer in Hadoop?

509

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How would you check whether your NameNode is working or not?

420

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

459

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

549

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What happens if the number of reducers is 0 in Hadoop?

481

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Why is Data Block size set to 128 MB in Hadoop?

439

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What is a Heartbeat in Hadoop?

560

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Comparison between Secondary NameNode and Checkpoint Node in Hadoop?

505

---

What is a Backup node in Hadoop?

558

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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?

590

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

1278

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What is Balancer in Hadoop?

472

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What is active and passive NameNode in Hadoop?

463

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