Explain Erasure Coding in Hadoop?

511

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What is Disk Balancer in Hadoop?

522

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

427

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

467

---

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

555

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

483

---

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

446

---

What is a Heartbeat in Hadoop?

566

---

Comparison between Secondary NameNode and Checkpoint Node in Hadoop?

516

---

What is a Backup node in Hadoop?

566

---

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

503

---

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

599

---

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

1285

---

What is Balancer in Hadoop?

483

---

What is active and passive NameNode in Hadoop?

471

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