1. What is HDFS?
  2. What is the primary motivation behind using HDFS?
  3. Explain the architecture of HDFS.
  4. What is the role of the NameNode in HDFS?
  5. What is a DataNode in HDFS?
  6. How does HDFS ensure fault tolerance?
  7. What is a block in HDFS?
  8. How does HDFS handle large files?
  9. Explain the process of reading data from HDFS.
  10. How is data written to HDFS?
  11. What is the default replication factor in HDFS?
  12. Explain the importance of block replication in HDFS.
  13. How does HDFS handle data locality?
  14. What is the Secondary NameNode in HDFS, and what is its role?
  15. Explain the process of recovering from a NameNode failure.
  16. What is the purpose of the fsimage file in HDFS?
  17. How does HDFS handle write operations?
  18. Explain the role of the rack awareness feature in HDFS.
  19. What is the significance of the balancer in HDFS?
  20. How does HDFS handle security?