7 Reasons why your microservices should use Event Sourcing & CQRS

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Event Sourcing & CQRS offers a compelling and often controversial alternative for persisting data in microservice systems environments. This alternate approach is new for most of us, and it is justified to have a healthy level of skepticism towards any shiny new and often over-hyped solution. However, what is interesting is that this is so new that even the champions and evangelists often overlook the real benefits provided by this new way of capturing and storing data. In this talk, we will look at 7 of the top reasons for using Event Sourcing & CQRS. These reasons covered go beyond the often referenced benefits, such as event stores are natural audit logs, or offering the ability to go back in history to replay past events. The primary goal of this talk is to flip your view from limited to no use of ES & CQRS to an alternate perspective of what you give up when you elect to not use it as the go-to persistence strategy. (This is a short 15 minute version of a 45-50 minute talk that. See YouTube for longer versions of this talk.)

Software

7 Reasons why your microservices should use
Event Sourcing & CQRS
Hugh McKee (@mckeeh3), Developer Advocate

0. What is Event Sourcing & CQRS
1. Smooth transition from DDD & Event Storming to implementation
2. Reduce service coupling
3. Break the read versus write performance bottleneck
4. Elevate the concurrency barrier
5. Simplify and harden messaging
6. Eliminate service coupling
7. Graduate from the IT Nursery
7 Reasons why your microservices should use ES & CQRS

Smooth transition from DDD & Event Storming to implementation

Domain Driven Design
Event Storming
Smooth transition from DDD & Event Storming to implementation

Commands & Events
Microservices
Domain Driven Design
Event Storming
Smooth transition from DDD & Event Storming to implementation

Commands & Events
Microservices
Domain Driven Design
Event Storming
Event Sourcing & CQRS
Smooth transition from DDD & Event Storming to implementation

Break the read versus write performance bottleneck
Optimize
Reads?
Writes

Optimize
Writes?
Break the read versus write performance bottleneck
Reads

Break the read versus write performance bottleneck

Break the read versus write performance bottleneck
Eventually consistent

• at-most-once
• at-least-once
• exactly-once
Semantics of delivery
(maybe-once)
(once-or-more)
(essentially-once)
Simplify and harden messaging

Simplify and harden messaging
At-least-once
Push

Simplify and harden messaging
At-most-once
Push

Simplify and harden messaging
At-least-once
Pull

7 Reasons why your microservices should use ES & CQRS
7
0. What is Event Sourcing & CQRS
1. Smooth transition from DDD & Event Storming to implementation
2. Reduce service coupling
3. Break the read versus write performance bottleneck
4. Elevate the concurrency barrier
5. Simplify and harden messaging
6. Eliminate service coupling
7. Graduate from the IT Nursery
Reason

Graduate from the IT Nursery
Reduce
Governance
Reduce
Ceremony
and
Ritual
Increase
Velocity

Graduate from the IT Nursery
Reduce
Governance
Reduce
Ceremony
and
Ritual
Increase
Velocity
Organized Chaos

Graduate from the IT Nursery
Reduce
Governance
Reduce
Ceremony
and
Ritual
Increase
Velocity
Organized Revolution

Graduate from the IT Nursery
Reduce
Governance
Reduce
Ceremony
and
Ritual
Increase
Velocity
People are very open-minded about new things
- as long as they're exactly like the old ones.
-Charles F. Kettering

7 Reasons why your microservices should use ES & CQRS
0. What is Event Sourcing & CQRS
1. Smooth transition from DDD & Event Storming to implementation
2. Reduce service coupling
3. Break the read versus write performance bottleneck
4. Elevate the concurrency barrier
5. Simplify and harden messaging
6. Eliminate service coupling
7. Graduate from the IT Nursery

Hugh McKee (@mckeeh3), Developer Advocate
7 Reasons why your microservices should use
Event Sourcing & CQRS
Slides - https://bit.ly/2QuMu7C

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7 Reasons why your microservices should use Event Sourcing & CQRS

1. 7 Reasons why your microservices should use Event Sourcing & CQRS Hugh McKee (@mckeeh3), Developer Advocate

2. 0. What is Event Sourcing & CQRS 1. Smooth transition from DDD & Event Storming to implementation 2. Reduce service coupling 3. Break the read versus write performance bottleneck 4. Elevate the concurrency barrier 5. Simplify and harden messaging 6. Eliminate service coupling 7. Graduate from the IT Nursery 7 Reasons why your microservices should use ES & CQRS

3. 0. What is Event Sourcing & CQRS 1. Smooth transition from DDD & Event Storming to implementation 2. Reduce service coupling 3. Break the read versus write performance bottleneck 4. Elevate the concurrency barrier 5. Simplify and harden messaging 6. Eliminate service coupling 7. Graduate from the IT Nursery 7 Reasons why your microservices should use ES & CQRS 0Reason

7. 0. What is Event Sourcing & CQRS 1. Smooth transition from DDD & Event Storming to implementation 2. Reduce service coupling 3. Break the read versus write performance bottleneck 4. Elevate the concurrency barrier 5. Simplify and harden messaging 6. Eliminate service coupling 7. Graduate from the IT Nursery 7 Reasons why your microservices should use ES & CQRS 1Reason

8. Smooth transition from DDD & Event Storming to implementation

9. Domain Driven Design Event Storming Smooth transition from DDD & Event Storming to implementation

10. Commands & Events Microservices Domain Driven Design Event Storming Smooth transition from DDD & Event Storming to implementation

11. Commands & Events Microservices Domain Driven Design Event Storming Event Sourcing & CQRS Smooth transition from DDD & Event Storming to implementation

12. 0. What is Event Sourcing & CQRS 1. Smooth transition from DDD & Event Storming to implementation 2. Reduce service coupling 3. Break the read versus write performance bottleneck 4. Elevate the concurrency barrier 5. Simplify and harden messaging 6. Eliminate service coupling 7. Graduate from the IT Nursery 7 Reasons why your microservices should use ES & CQRS 2Reason

13. Reduce service coupling

14. Reduce service coupling

15. Reduce service coupling

16. 0. What is Event Sourcing & CQRS 1. Smooth transition from DDD & Event Storming to implementation 2. Reduce service coupling 3. Break the read versus write performance bottleneck 4. Elevate the concurrency barrier 5. Simplify and harden messaging 6. Eliminate service coupling 7. Graduate from the IT Nursery 7 Reasons why your microservices should use ES & CQRS 3Reason

17. Break the read versus write performance bottleneck Optimize Reads? Writes

18. Optimize Writes? Break the read versus write performance bottleneck Reads

19. Break the read versus write performance bottleneck

20. Break the read versus write performance bottleneck

21. Break the read versus write performance bottleneck

22. Break the read versus write performance bottleneck

23. Break the read versus write performance bottleneck Eventually consistent

24. 0. What is Event Sourcing & CQRS 1. Smooth transition from DDD & Event Storming to implementation 2. Reduce service coupling 3. Break the read versus write performance bottleneck 4. Elevate the concurrency barrier 5. Simplify and harden messaging 6. Eliminate service coupling 7. Graduate from the IT Nursery 7 Reasons why your microservices should use ES & CQRS 4Reason

25. Elevate the concurrency barrier

26. Elevate the concurrency barrier

27. 0. What is Event Sourcing & CQRS 1. Smooth transition from DDD & Event Storming to implementation 2. Reduce service coupling 3. Break the read versus write performance bottleneck 4. Elevate the concurrency barrier 5. Simplify and harden messaging 6. Eliminate service coupling 7. Graduate from the IT Nursery 7 Reasons why your microservices should use ES & CQRS 5Reason

28. • at-most-once • at-least-once • exactly-once Semantics of delivery (maybe-once) (once-or-more) (essentially-once) Simplify and harden messaging

29. Simplify and harden messaging At-least-once Push

30. Simplify and harden messaging At-most-once Push

31. Simplify and harden messaging At-least-once Pull

32. 0. What is Event Sourcing & CQRS 1. Smooth transition from DDD & Event Storming to implementation 2. Reduce service coupling 3. Break the read versus write performance bottleneck 4. Elevate the concurrency barrier 5. Simplify and harden messaging 6. Eliminate service coupling 7. Graduate from the IT Nursery 7 Reasons why your microservices should use ES & CQRS 6Reason

33. Eliminate service coupling

34. Eliminate service coupling

35. Eliminate service coupling

36. Eliminate service coupling

37. Eliminate service coupling

38. Eliminate service coupling

39. Eliminate service coupling

40. Eliminate service coupling

41. 7 Reasons why your microservices should use ES & CQRS 7 0. What is Event Sourcing & CQRS 1. Smooth transition from DDD & Event Storming to implementation 2. Reduce service coupling 3. Break the read versus write performance bottleneck 4. Elevate the concurrency barrier 5. Simplify and harden messaging 6. Eliminate service coupling 7. Graduate from the IT Nursery Reason

42. Graduate from the IT Nursery Reduce Governance Reduce Ceremony and Ritual Increase Velocity

43. Graduate from the IT Nursery Reduce Governance Reduce Ceremony and Ritual Increase Velocity

44. Graduate from the IT Nursery Reduce Governance Reduce Ceremony and Ritual Increase Velocity Organized Chaos

45. Graduate from the IT Nursery Reduce Governance Reduce Ceremony and Ritual Increase Velocity Organized Revolution

46. Graduate from the IT Nursery Reduce Governance Reduce Ceremony and Ritual Increase Velocity People are very open-minded about new things - as long as they're exactly like the old ones. -Charles F. Kettering

47. 7 Reasons why your microservices should use ES & CQRS 0. What is Event Sourcing & CQRS 1. Smooth transition from DDD & Event Storming to implementation 2. Reduce service coupling 3. Break the read versus write performance bottleneck 4. Elevate the concurrency barrier 5. Simplify and harden messaging 6. Eliminate service coupling 7. Graduate from the IT Nursery

48. Hugh McKee (@mckeeh3), Developer Advocate 7 Reasons why your microservices should use Event Sourcing & CQRS Slides - https://bit.ly/2QuMu7C

7 Reasons why your microservices should use Event Sourcing & CQRS

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7 Reasons why your microservices should use Event Sourcing & CQRS