midHadoop
Explain HDFS architecture in detail
Updated May 16, 2026
Short answer
HDFS uses NameNode, DataNodes, and secondary nodes for distributed storage.
Deep explanation
NameNode manages metadata, DataNodes store blocks, and Secondary NameNode helps with checkpoints. Data is split, replicated, and distributed.
Real-world example
Large-scale log storage systems in enterprises.
Common mistakes
- Confusing Secondary NameNode with standby NameNode.
Follow-up questions
- What is checkpoint node?
- How is metadata stored?