Q. What happens if the NameNode fails and there's no backup?

  • (A) Data is permanently lost
  • (B) DataNodes stop working
  • (C) You can restart from the last checkpoint
  • (D) All MapReduce jobs fail but data remains safe
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✅ Correct Answer: (A) Data is permanently lost
Explanation: NameNode stores metadata; if lost without backup, the entire HDFS becomes unreadable.

Published by Mr. Dubey ⭐ 110.47K Points at 13-Jun-2025 07:25 am in Hadoop

Explanation by: Mr. Dubey
NameNode stores metadata; if lost without backup, the entire HDFS becomes unreadable.

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