We've all heard the "Rails can't scale" myth, but how far can we scale Rails? This is a story about a one year project scaling a REST API for concert ticketing and e-commerce to huge presale events and the lessons learned on the way. Topics include HTTP Caching on a Budget Redis is Your Friend Waiting Queue Architectures How not to Blow up Your Database How to Test Scale Tips and Tricks for Concurrent Writing

1. jensravens.com / nerdgeschoss.de / RUG::B 2020
Turn it up to 11
Scaling Rails to 100k rps
Jens Ravens

2. jensravens.com / nerdgeschoss.de / RUG::B 2020

3. jensravens.com / nerdgeschoss.de / RUG::B 2020
😱

4. jensravens.com / nerdgeschoss.de / RUG::B 2020
😱

5. jensravens.com / nerdgeschoss.de / RUG::B 2020
😱

6. jensravens.com / nerdgeschoss.de / RUG::B 2020
Who is this guy?

7. jensravens.com / nerdgeschoss.de / RUG::B 2020
Who is this guy?
(aka the shameless self promotion part)

8. jensravens.com / nerdgeschoss.de / RUG::B 2020
Jens Ravens
Developer at nerdgeschoss, a mobile first dev agency for sophisticated software.
We help startups and medium businesses to build awesome stuff.

9. jensravens.com / nerdgeschoss.de / RUG::B 2020
Jens Ravens
Developer at nerdgeschoss, a mobile first dev agency for sophisticated software.
We help startups and medium businesses to build awesome stuff.
And we can help you build your product, too.

10. jensravens.com / nerdgeschoss.de / RUG::B 2020
Jens Ravens
50% iOS / macOS using Swift
50% Web / API using Ruby on Rails and React / TypeScript

11. jensravens.com / nerdgeschoss.de / RUG::B 2020
Jens Ravens
50% iOS / macOS using Swift
50% Web / API using Ruby on Rails and React / TypeScript

12. jensravens.com / nerdgeschoss.de / RUG::B 2020
Jens Ravens
50% iOS / macOS using Swift
50% Web / API using Ruby on Rails and React / TypeScript

13. jensravens.com / nerdgeschoss.de / RUG::B 2020
Jens Ravens
Also I blog about Swift and Ruby stuff on jensravens.com.

14. jensravens.com / nerdgeschoss.de / RUG::B 2020
What I am going to talk about…

15. jensravens.com / nerdgeschoss.de / RUG::B 2020
What I am going to talk about…
…but Rails doesn’t scale!

16. jensravens.com / nerdgeschoss.de / RUG::B 2020
What I am going to talk about…
a case study about e-commerce
…but Rails doesn’t scale!

17. jensravens.com / nerdgeschoss.de / RUG::B 2020
What I am going to talk about…
a case study about e-commerce
sharpen your tools
…but Rails doesn’t scale!

18. jensravens.com / nerdgeschoss.de / RUG::B 2020
What I am going to talk about…
a case study about e-commerce
sharpen your tools
turn it up to eleven
…but Rails doesn’t scale!

19. jensravens.com / nerdgeschoss.de / RUG::B 2020
Why should you even go with Rails for a
performance intensive app?

20. jensravens.com / nerdgeschoss.de / RUG::B 2020
Why should you even go with Rails for a
performance intensive app?
🚀
speed

21. jensravens.com / nerdgeschoss.de / RUG::B 2020
Why should you even go with Rails for a
performance intensive app?
🚀
speed
(of development)

22. jensravens.com / nerdgeschoss.de / RUG::B 2020
Why should you even go with Rails for a
performance intensive app?
🚀 🤓
speed developer happiness
(of development)

23. jensravens.com / nerdgeschoss.de / RUG::B 2020
Why should you even go with Rails for a
performance intensive app?
🚀 🤓
speed developer happiness
(of development)

24. jensravens.com / nerdgeschoss.de / RUG::B 2020
Rack-Apps are blocking.

25. jensravens.com / nerdgeschoss.de / RUG::B 2020
Rack-Apps are blocking.
Other languages/frameworks might give you more
rps per ram.

26. jensravens.com / nerdgeschoss.de / RUG::B 2020
Rack-Apps are blocking.
Other languages/frameworks might give you more
rps per ram.
But here is a well kept secret…

27. jensravens.com / nerdgeschoss.de / RUG::B 2020
Rack-Apps are blocking.
Other languages/frameworks might give you more
rps per ram.
But here is a well kept secret…
I just don't care.

28. jensravens.com / nerdgeschoss.de / RUG::B 2020
A look at last month’s spendings.
Server Costs
3 %
Office
8 %
Salaries
89 %

29. jensravens.com / nerdgeschoss.de / RUG::B 2020
A look at last month’s spendings.
faster development = more revenue

30. jensravens.com / nerdgeschoss.de / RUG::B 2020
Rails is fast enough. We should focus on
developer productivity instead.

31. jensravens.com / nerdgeschoss.de / RUG::B 2020
krasserstoff.com - A Case Study

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krasserstoff.com - A Case Study

33. jensravens.com / nerdgeschoss.de / RUG::B 2020
krasserstoff.com - A Case Study

34. jensravens.com / nerdgeschoss.de / RUG::B 2020
krasserstoff.com - A Case Study

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measure, implement, repeat

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Tools that can help you

37. jensravens.com / nerdgeschoss.de / RUG::B 2020
Tools that can help you

38. jensravens.com / nerdgeschoss.de / RUG::B 2020
Tools that can help you

39. jensravens.com / nerdgeschoss.de / RUG::B 2020
Tools that can help you

40. jensravens.com / nerdgeschoss.de / RUG::B 2020
Because performance tuning means changing your
tires at 65 mph on the highway without
stopping.

41. jensravens.com / nerdgeschoss.de / RUG::B 2020
Because performance tuning means changing your
tires at 65 mph on the highway without
stopping.

42. jensravens.com / nerdgeschoss.de / RUG::B 2020
Scaling with the Cloud

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Follower Databases

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HTTP Caching

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Application Cache

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Hunting Down N+1 Queries

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Hunting Down N+1 Queries

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Hunting Down N+1 Queries

49. jensravens.com / nerdgeschoss.de / RUG::B 2020
Conservative Technologies
https://www.ably.io/blog/google-polling-like-its-the-90s/

50. jensravens.com / nerdgeschoss.de / RUG::B 2020
Small Responses and Batch Loading
https://dev.to/usamaashraf/n1-queries-batch-loading--active-model-serializers-in-rails--3hkf

51. jensravens.com / nerdgeschoss.de / RUG::B 2020
SQL is your Friend

52. jensravens.com / nerdgeschoss.de / RUG::B 2020
SQL is your Friend

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Embrace Eventual Consistency

54. jensravens.com / nerdgeschoss.de / RUG::B 2020
Embrace Eventual Consistency

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Avoiding Locks and Mutexes

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Avoiding Locks and Mutexes

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Hold the Door!

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Hold the Door!
1 2 3 4 5 6 7 8 9 10

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Hold the Door!

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Keep it Simple!

62. jensravens.com / nerdgeschoss.de / RUG::B 2020
Keep it Simple!
79 Controllers
84 Models
79 471 Lines of Code
… and still MVC

63. jensravens.com / nerdgeschoss.de / RUG::B 2020
Thank you.
Jens Ravens / @jensravens