Traps on the Path to Microservices - Lead Dev 2018

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George Woskob

A talk I gave at https://newyork2018.theleaddeveloper.com/

Tecnologia

Traps on the Path to
Microservices
George Woskob | New York, NY

©ThoughtWorks 2017 Commercial in Confidence
Once upon a time there was an airline...
2
● Founded in 1937
● By Willbur and Orville Redenbacher
● Pioneer in computerized reservation
system

©ThoughtWorks 2017 Commercial in Confidence
DB
3rd
Party
BIG BALL
OF MUD
(SEPARATION OF CONCERNS?)
FRONT END
4th
Party
..and they had a monolith
3

©ThoughtWorks 2017 Commercial in Confidence
4

©ThoughtWorks 2017 Commercial in Confidence
5
“Microservices are the future!”
-very senior Architect

©ThoughtWorks 2017 Commercial in Confidence
6

©ThoughtWorks 2017 Commercial in Confidence
DB
3rd PARTY
BIG BALL
OF MUD
FRONT END
4th PARTY
FANCY NEW FE
NEW!
NEW!
NEW!
NOSQL!
(NEGLECTED)
ETL
NEW!
...but we ended up here
7

©ThoughtWorks 2017 Commercial in Confidence
8

©ThoughtWorks 2017 Commercial in Confidence
9

©ThoughtWorks 2017 Commercial in Confidence
10

©ThoughtWorks 2017 Commercial in Confidence
The traps
11
UNDERESTIMATING THE
COST OF A MICROSERVICE
OVERCENTRALIZATION
NEGLECTING THE
MONOLITH

Underestimating the cost
of a microservice
Just because you’re doing microservices, doesn’t mean you’re seeing their value

©ThoughtWorks 2017 Commercial in Confidence
Operational costs
13
Additional points of failure
Scaling
Build and deploy pipelines

©ThoughtWorks 2017 Commercial in Confidence
Integration costs
14
With other services
With the monolith
Error handling

©ThoughtWorks 2017 Commercial in Confidence
Developer’s costs
Running several services locally
Test data
Networking config
Interteam communication
15

©ThoughtWorks 2017 Commercial in Confidence
It’s all about automation!
Dev workstation
Test data
Networking
16

©ThoughtWorks 2017 Commercial in Confidence
Contract tests!
17

©ThoughtWorks 2017 Commercial in Confidence
18
Don’t gamble with your architecture
Going all in

©ThoughtWorks 2017 Commercial in Confidence
(Marginal benefit) – (Marginal cost) > 0
19

©ThoughtWorks 2017 Commercial in Confidence
Where do I start?
20
Faster feature development
Encapsulation of business functionality
Optimal technology or design for the task
Scalability needs
Functionality that is “ripe for a rewrite”

©ThoughtWorks 2017 Commercial in Confidence
(Marginal benefit) – (Marginal cost) > 0
21

Overcentralization
All hail the distributed monolith!

©ThoughtWorks 2017 Commercial in Confidence
Technical overcentralization
23

©ThoughtWorks 2017 Commercial in Confidence
Too much shared code
24
Can create complex release dependencies
Can tie you to a particular tech stack

©ThoughtWorks 2017 Commercial in Confidence
Avoiding too much shared code
25
Follow rules of library design
Consensus on standards over shared implementation
No business logic!

©ThoughtWorks 2017 Commercial in Confidence
Organizational overcentralization
26

©ThoughtWorks 2017 Commercial in Confidence
Organizational tollgates
27
PROD

©ThoughtWorks 2017 Commercial in Confidence
Organizational tollgates
28
PROD

©ThoughtWorks 2017 Commercial in Confidence
Organizational tollgates
29
PROD

©ThoughtWorks 2017 Commercial in Confidence
Integrate Ops and QA
with your Dev Teams
30

Neglecting the monolith
Legacy code needs love too!

©ThoughtWorks 2017 Commercial in Confidence
“The monolith will be gone soon!”
32

©ThoughtWorks 2017 Commercial in Confidence
Always be improving your monolith!
(Test it!)
33

©ThoughtWorks 2017 Commercial in Confidence
“Microservices are the panacea!”
34

©ThoughtWorks 2017 Commercial in Confidence
Make sure you actually use the
strangler pattern!
35

©ThoughtWorks 2017 Commercial in Confidence
36

©ThoughtWorks 2017 Commercial in Confidence
The traps
37
UNDERESTIMATING THE
COST OF A MICROSERVICE
OVERCENTRALIZATION
NEGLECTING THE
MONOLITH

©ThoughtWorks 2017 Commercial in Confidence
Some parting words
38
Keep in mind marginal utility!
Make room for autonomy
Own the whole process
Don’t wait for microservices

THANK YOU
For questions or suggestions:
George Woskob
gwoskob@ThoughtWorks.com
Special thanks to Dan Lockman with whom I originally wrote this talk
39

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Traps on the Path to Microservices - Lead Dev 2018

1. Traps on the Path to Microservices George Woskob | New York, NY

2. ©ThoughtWorks 2017 Commercial in Confidence Once upon a time there was an airline... 2 ● Founded in 1937 ● By Willbur and Orville Redenbacher ● Pioneer in computerized reservation system

3. ©ThoughtWorks 2017 Commercial in Confidence DB 3rd Party BIG BALL OF MUD (SEPARATION OF CONCERNS?) FRONT END 4th Party ..and they had a monolith 3

7. ©ThoughtWorks 2017 Commercial in Confidence DB 3rd PARTY BIG BALL OF MUD FRONT END 4th PARTY FANCY NEW FE NEW! NEW! NEW! NOSQL! (NEGLECTED) ETL NEW! ...but we ended up here 7

11. ©ThoughtWorks 2017 Commercial in Confidence The traps 11 UNDERESTIMATING THE COST OF A MICROSERVICE OVERCENTRALIZATION NEGLECTING THE MONOLITH

12. Underestimating the cost of a microservice Just because you’re doing microservices, doesn’t mean you’re seeing their value

13. ©ThoughtWorks 2017 Commercial in Confidence Operational costs 13 Additional points of failure Scaling Build and deploy pipelines

14. ©ThoughtWorks 2017 Commercial in Confidence Integration costs 14 With other services With the monolith Error handling

15. ©ThoughtWorks 2017 Commercial in Confidence Developer’s costs Running several services locally Test data Networking config Interteam communication 15

20. ©ThoughtWorks 2017 Commercial in Confidence Where do I start? 20 Faster feature development Encapsulation of business functionality Optimal technology or design for the task Scalability needs Functionality that is “ripe for a rewrite”

22. Overcentralization All hail the distributed monolith!

24. ©ThoughtWorks 2017 Commercial in Confidence Too much shared code 24 Can create complex release dependencies Can tie you to a particular tech stack

25. ©ThoughtWorks 2017 Commercial in Confidence Avoiding too much shared code 25 Follow rules of library design Consensus on standards over shared implementation No business logic!

31. Neglecting the monolith Legacy code needs love too!

37. ©ThoughtWorks 2017 Commercial in Confidence The traps 37 UNDERESTIMATING THE COST OF A MICROSERVICE OVERCENTRALIZATION NEGLECTING THE MONOLITH

38. ©ThoughtWorks 2017 Commercial in Confidence Some parting words 38 Keep in mind marginal utility! Make room for autonomy Own the whole process Don’t wait for microservices

39. THANK YOU For questions or suggestions: George Woskob gwoskob@ThoughtWorks.com Special thanks to Dan Lockman with whom I originally wrote this talk 39

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