What is a cluster in big data?

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1. #jobtracker
2. #namenode
3. #machine
4. #unstructured
5. #another
6. #environment
7. #designated
8. #storing
9. #amounts
10. #computational
11. #special
12. #distributed
13. #designed
14. #typically
15. #cluster
16. #masters
17. #these
18. #analyzing
19. #computing
20. #hadoop
21. #specifically