Why Hadoop has default replication factor 3?

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1. #block
2. #number
3. #replicated
4. #default
5. #changed
6. #hadoop
7. #fault
8. #requirement
9. #which
10. #framework
11. #factor
12. #replication
13. #tolerance
14. #basically
15. #provide
16. #configured
17. #times
18. #increased
19. #every
20. #replicate