3. Setting expectations and context Architecting for scale – a web app journey to scalability Scaling ‘real-world’ applications

6. Losing Business DowntimeSlow Site

8. Scale Up – aka Vertical Scaling Increase resources capacity within existing node Scaling Options Scale Out – aka Horizontal Scaling Increase resources capacity by adding nodes

9. A web app’s journey towards scalability

10. Level 1 Level 2 Boss Level # of users >100,000 RPS >10,000 RPS >100 RPS

11. Level 1: Beginners

12. Website Database stored on local disk Session state stored in local memory Images stored on local disk* Statefull Application *Local disk should be treated as a shared resource in Azure Websites

13. Level 1 – Photo Gallery (untouched) Scale Testing Results: Scale Count Scale Size Test Duration Max User Count Avg Pages/Sec Avg Page Time (sec) Avg RPS (Visual Studio) WebSites RPS Failed Tests Total Tests Failed Tests (%) 1MED1520.271.161.7710770.0 1MED15201.96.514.21805590.0 1MED15503.4810.439.54519800.1 1MED15805.5812.551.555016390 1MED151204.9522.547.8501914461.3

14. Level 2: Experts

15. Website

16. Level 2 – Horizontally Scalable Photo Gallery Strategy:

17. Level 2 – Horizontally Scalable Photo Gallery Scale Testing Results Scale Count Scale Size Test Duration Max User Count Avg Pages/Sec Avg Page Time (sec) Avg RPS (Visual Studio) WAWS RPS Failed Tests Total Tests Failed Tests (%) 1LARGE15202.910.1323.42108490.0 1LARGE1510014.40.152327704,2470.0 1LARGE1520029.20.1496615508,5630.0 1LARGE1530043.60.242,535231012,8390.0 1LARGE151,0001410.678,135735020,5910.0 3LARGE201,5001981.3719,8551297132,7630.0 3LARGE252,0002422.1224,896154787053,4961.6

18. Configure Auto Scale Optimize Website Code Optimize SQL Add Cache Layer Use CDN for content, *.js & *.css Leverage other services Level 2 – Horizontally Scalable Photo Gallery Other improvements:

19. Level 1 Level 2 Boss Level # of users >100,000 RPS >10,000 RPS >100 RPS

20. Level 3: Like a BOSS!

21. Level 3 – Globally Scalable Photo Gallery When bad things happen to good datacenters My Site Replica (A) My Site Replica (B)

22. Gaps: Web app is ‘local’ to a single region Images stored in ‘local’ data center Database in ‘local’ data center Goals: Active / Active replication across regions Benefits: Bigger Scale Lower Latency Higher Uptime and DR Level 3 – Globally Scalable Photo Gallery Moving towards a global presence

23. Level 3 – Globally Scalable Photo Gallery Architecture: East US Website Webjob West US Website Webjob

24. Level 3 – Globally Scalable Photo Gallery Architecture: East US Website Webjob West US Website Webjob

25. Level 3 – Globally Scalable Photo Gallery Strategy: * Command Query Responsibility Segregation adds latency and app complexity West US Website Webjob

26. Level 3 – Globally Scalable Photo Gallery Words of Caution: West US Website Webjob

27. Level 1 Level 2 Boss Level # of users >100,000 RPS >10,000 RPS >100 RPS

28. Massive Scale WordPress

29. Recommended Reading

32. www.microsoft.com/learning http://developer.microsoft.com http://microsoft.com/technet http://channel9.msdn.com/Events/TechEd