The document discusses real-world microservices architecture, highlighting its definition, benefits, complexities, and practical stories from various domains. It emphasizes principles such as autonomy, speed of change, and resilience while sharing experiences of splitting from monoliths and managing operational complexities. Key takeaways include understanding your domain, carefully navigating trade-offs, and fostering an organizational shift towards microservices for continuous delivery.

1. REAL-WORLD
MICROSERVICES
Lessons From The Frontline

2. AGENDA
2
Definition
Benefits & Complexities
Stories & Practices

3. WHAT IS A MICROSERVICES ARCHITECTURE?
Post-continuous
delivery SOA

4. WHAT IS A MICROSERVICES ARCHITECTURE?
Post-continuous
delivery SOA
Fine-grained
domain capability

5. WHAT IS A MICROSERVICES ARCHITECTURE?
Post-continuous
delivery SOA
Fine-grained
domain capability
Independently
releasable

6. WHAT IS A MICROSERVICES ARCHITECTURE?
Post-continuous
delivery SOA
Fine-grained
domain capability
Independently
releasable
Language agnostic
integration

7. WHAT MICROSERVICES ARCHITECTURE IS NOT

8. WHAT MICROSERVICES ARCHITECTURE IS NOT
Monolithic

9. WHAT MICROSERVICES ARCHITECTURE IS NOT
Monolithic
Layered and cross-functional

10. WHAT MICROSERVICES ARCHITECTURE IS NOT
Monolithic
Layered and cross-functional
Intelligently
integrated
Intelligent Integration

11. WHAT MICROSERVICES ARCHITECTURE IS NOT
Monolithic
Layered and cross-functional
Intelligently
integrated
Centrally integrated

12. VALUES
INNOVATION
COMPOSABILITY
AUTONOMY
with
RESPOSIBILITY
SPEED OF CHANGE
SCALE
LOWER
CONGITIVE LOAD
TECH DIVERSIFICATION

13. 6
VALUES &
PRINCIPLES
Autonomy
Speed of Change
Scale
Composability
Tech Diversity
COMPLEXITIES
Communication
Execution
Resilience
Maintenance
Operational
MICRO MACRO

14. RYAN’S
STORY
DOMAIN COMPLEXITY
Supply Chain SAN FRANCISCO
7

15. SPLITTING FROM MONOLITH – BROWN FIELD

16. SPLITTING FROM MONOLITH – BROWN FIELD
DOMAIN
BOUNDED
CONTEXT

17. SPLITTING FROM MONOLITH – BROWN FIELD
DOMAIN
BOUNDED
CONTEXT
RATE OF
CHANGE

18. SPLITTING FROM MONOLITH – BROWN FIELD
DOMAIN
BOUNDED
CONTEXT
RATE OF
CHANGE
TEAM STRUCTURE
Conway’s Law

19. SPLITTING FROM MONOLITH – BROWN FIELD
DOMAIN
BOUNDED
CONTEXT
RATE OF
CHANGE
WHAT HURTS MOST
TEAM STRUCTURE
Conway’s Law

20. CAUTION: PARTITIONING BY EXISTING COUPLING
D3.js
Structure 101
FxCop
NDepend

21. 10
GREEN FIELD DOMAIN MODELLING
USE THE JOURNEYS

22. GREEN FIELD DOMAIN MODELLING
INSPECT THE BOUNDED CONTEXTS
Neo4J

23. 12
One service at a time
Single responsibility
Loose coupling
High cohesion
SOLID principles
EVOLUTIONARY
BACK TO BASIC PRINCIPLES

24. EVAN’S
STORY
SERVICE OWNERSHIP
Online Real Estate MELBOURNE
13

25. LONG-LIVED TEAMS
15

26. 15
LONG-LIVED TEAMS
FLUID TEAM
MEMBERSHIP

27. 15
LONG-LIVED TEAMS
FLUID TEAM
MEMBERSHIP
COLLABORATIVE
CODING

28. KENT’S
STORY
EXECUTION COMPLEXITY PIPELINES
Online Retail MELBOURNE
16

29. CONSUMER-DRIVEN CONTRACTS
Consumer Provider
Purchase
Confirm.
Email
Purchase
Service

30. CONSUMER-DRIVEN CONTRACTS
Consumer Provider
Purchase
Confirm.
Email
Purchase
Service
Purchase
Service
API Test
Purchase
Service
Mock

31. CONSUMER-DRIVEN CONTRACTS
Consumer Provider
Purchase
Confirm.
Email
Purchase
Service
Purchase
Service
API Test
Purchase
Service
Mock

32. Production
DECENTRALISED PIPELINE
Build Test Integration Test Acceptance Test

33. DECENTRALISED PIPELINE
Build Test Consumer Test Acceptance Test Production

34. EVAN’S
STORY
OPERATIONAL COMPLEXITY - MONITORING
Online Real Estate MELBOURNE
19

35. 20
Heartbeat for
load balancer

36. 21
Nagios
checks

37. 22
Full diagnosis
for human

38. 23
AGGREGATED MONITORING
Riemann
Event
processing

39. 24
SYNTHETIC TRANSACTIONS

40. KENT’S
STORY
OPERATIONAL COMPLEXITY TRADEOFFS
Online Retail MELBOURNE
25

41. MONITORING AGGREGATED LOGS
26
ID: 123
ID: 123.467
ID: 123.892

42. RESILIENCE
STATUS
• Up

43. RESILIENCE
STATUS
•
•
Up
Down

44. RESILIENCE
STATUS
•
•
Up
Down
STATUS
• All up

45. RESILIENCE
STATUS
•
•
Up
Down
STATUS
• All up
• All down

46. RESILIENCE
STATUS
•
•
Up
Down
STATUS
• All up
• All down
• Mostly up

47. RESILIENCE
STATUS
•
•
Up
Down
STATUS
• All up
• All down
• Mostly up
•
Up apart from 1

48. RESILIENCE
STATUS
•
•
Up
Down
STATUS
• All up
• All down
• Mostly up
•
Up apart from 1
• All of the important bits are up

49. FAULT TOLERANCE PATTERNS
28
CIRCUIT BREAKER
Netflix/
Hystrix
[failure threshold
reached]
CLOSED
[call succeeds]
Reset
Trip breaker
[call fails]
Trip Breaker
HALF
OPEN
OPEN
on timeout
Attempt Reset

50. JAMES’
STORY MAINTAINABILITY
Telecommunication SYDNEY
29

51. SERVICES SELF-DISCOVERABILITY

52. SERVICES SELF-DISCOVERABILITY

53. SERVICES SELF-DISCOVERABILITY

54. SERVICES SELF-DISCOVERABILITY

55. SERVICESSELF-DISCOVERABILITY

56. SERVICES SELF-DISCOVERABILITY

57. SCOTT’S
STORY
A NEW DOMAIN VIEW
Global Assignee Tax Services MELBOURNE
31

58. History is the version of past events that
people have decided to agree upon.
- Napoleon Bonaparte
32

59. THE EVOLUTION OF MODELLING THE DOMAIN
33
Entity centric
e.g. Customer
Entity centric
e.g. Credit

60. THE EVOLUTION OF MODELLING THE DOMAIN
33
Entity centric
e.g. Credit
Activity centric
e.g. Purchase
Entity centric
e.g. Customer

61. THE EVOLUTION OF MODELLING THE DOMAIN
33
Entity centric
e.g. Credit
Activity centric
e.g. Purchase
Entity centric
e.g. Customer
Aggregator centric
e.g. Notification board
Search everywhere
Reports

62. THE EVOLUTION OF MODELLING THE DOMAIN
33
Entity centric
e.g. Credit
Activity centric
e.g. Purchase
Entity centric
e.g. Customer
Aggregator centric
e.g. Notification board
Search everywhere
Reports

63. DOMAIN EVENTS AS FIRST CLASS CITIZENS
DOMAIN EVENT
Time {t}, CustomerRegistered, …
Time {t}, CreditDebited, …
Time {t}, OrderPlaced, …
(1) Publisher-
Subscriber
(2) RESTful
Event
endpoints
F
Build future
capabilities
e.g.
gamification

64. JR’S
STORY
CHOREOGRAPHY
Online Retail BRISBANE
35

65. SERVICE COMPOSITION
Leave composition to the one with most context
Expose finer-grained operations
Composition of Sync and Async is hard , try
Reactive programming
JavaScript Promises, RxJava Observables
36

66. GILES’
STORY
FLEXIBILITY
Sports Broadcasting LONDON
37

67. THAT POPULAR SPORT
38

68. TAKE-AWAYS
KNOW YOUR PROBLEM & DOMAIN WELL
TRADE-OFF COMPLEXITIES CAREFULLY
IT’S AN ORGANISATIONAL AND CULTURAL SHIFT
EVOLVE FROM MACRO TO MICRO
BUILD FOR CONTINUOUS DELIVERY FROM DAY 0
MAKE SURE YOU ARE TALL ENOUGH ☺

69. 40
New!

70. 41
THANK YOU!
Zhamak Dehghani
zdehghan@thoughtworks.com
@zhamakd