1. Going Viral: Flash Crowds in an Open CDN

2. What is a Flash Crowd?

3. Key Questions

4. CoralCDN

5. CoralCDN

6. The Data

7. Finding Crowds

8. Crowd Sources

9. Common Referrers

10. Common Referrers

11. Common Referrers

12. Common Referrers

13. CDN Caching Strategies

14. Cooperation in Caching

15. Benefits of Cooperation?

16. Clients Use Many Proxies

17. Crowds Contain Many Objects

18. Benefits from Cooperation

19. Provisioning Resources For Crowds

20. Examples of Resource Provisioning

21. Required Resource Spin-up Time

22. Conclusions

23. Questions?

24. Extra Slides / Charts

25. Actual Spin-up Times on EC2

26. How Fast is Fast?

27. Origin Hits Saved by Cooperation

28. Bursty Redirection

29. Clients Distributed Widely

30. Detecting Crowds

31. Crowd Mitigation/Insurance