What is the difference between NameNode backup node and Checkpoint Namenode in HDFS?

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Tags

1. #enforcing
2. #image
3. #support
4. #uploaded
5. #upload
6. #similar
7. #there
8. #secondary
9. #namenode
10. #commonly
11. #after
12. #checkpoint
13. #functionality
14. #provides
15. #known
16. #backup
17. #merging
18. #synchronization