Decomposing a live application with confidence (v2)

We always try to avoid the famous Big Mall of Mud™ due to many reasons but what happens when we're already facing it - and making profit with it? Should we just accept our fate and keep fixing bugs for the rest of our lives or should we actually do something different?
In this presentation we'll share the challenges we're facing at Usabilla and how we're using DDD and Kafka to understand and decompose our software into services without having downtime or any impact on our users' experience.

Transcript

1. Luís Cobucci
 @lcobucci confidence Decomposing a live app with https://goo.gl/Nv1sV8
2. Photo by Rafael Dohms Bassano del Grappa !
3. Photo by Rafael Dohms Bassano del Grappa !
4. Live software! Photo by Rafael Dohms Software engineers
5. Luís Cobucci
 @lcobucci https://jobs.usabilla.com
6. Here we go… https://goo.gl/JF1cPb
7. Oh the chaos! https://goo.gl/D4DvKC
8. No tests https://goo.gl/tnbTEC
9. https://goo.gl/hr22Dx Outdated stack
10. https://goo.gl/qh3NNs Complexity
11. Very slow https://goo.gl/dRfUyZ
12. https://goo.gl/cuLYT9 Random bugs
13. https://goo.gl/HyzXpQ It’s all fine…
14. Look, light! https://goo.gl/9w9EBV
15. Great people https://goo.gl/JYsTJW
16. Work in progress https://goo.gl/CS6azo
17. Refactor all things! https://goo.gl/ebJsEL
18. https://goo.gl/CNzhi7 Saved searches
19. https://goo.gl/QrVWpC +50k emails
20. https://goo.gl/zoWGug Quality increase
21. Photo by Rafael Dohms Remember?
22. Wait, what? https://goo.gl/nTX7xr
23. Sometime ago… https://goo.gl/Zr2mJy
24. https://goo.gl/WdiLjf Big ball of mud
25. Unify everything https://goo.gl/TGmbsc
26. No major rewrite https://goo.gl/SfHtmY PLEASE
27. Strangler application https://goo.gl/9ctdLn
28. The big and scary application
29. The big and scary application Dummy proxy
30. The big and scary application Dummy proxy Nice and shiny!
31. The big and scary application Proxy Nice and shiny! Nice and shiny! Nice and shiny!
32. The big and scary application Proxy Nice and shiny! Nice and shiny! Nice and shiny!
33. Proxy Nice and shiny! Nice and shiny! Nice and shiny! WOW Much strangle So shiny
34. Photo by Rafael Dohms Ohh yeah!
35. Argh!
36. Decomposing https://goo.gl/YCrvVL
37. Hurry up! https://goo.gl/Psv1jN
38. “If you are afraid that producing software with thoughtful design is expensive, think how much more expensive it’s going to be to live with it or even fix a bad design.” Vaughn Vernon
39. https://goo.gl/62BNwH Domain knowledge
40. Call the experts https://goo.gl/4qKJTp
41. Event storming
42. Context mapping
43. Gherkin stories https://goo.gl/EJi8Xo
44. https://goo.gl/KFjUHT Metrics
45. SLI SLO https://goo.gl/LAa8Ex
46. https://goo.gl/TVBGXQ services Micro
47. https://goo.gl/Nr98Mo Evolvability
48. Service A Service B Service C
49. Service A Service B Service C Service A’
50. Service A Service B Service C Service A’
51. Service A Service B Service C Service A’
52. Service B Service C Service A’
53. https://goo.gl/EtNKra Simplicity
54. https://github.com/chimeraphp
55. https://goo.gl/Sx7TYA Strictness
56. https://goo.gl/Sx7TYA Growth & scale
57. Service A Service B Service F Service E Service G Service C Service D Events Store
58. Service A Service B Service F Service E Service G Service C Service D
59. Partitioned Low latency delivery Fast Fault tolerant Scalable
60. Group 1 Brokers Producer 1 Producer 2 Topic Partition 1 Partition 2 Consumer 1 Consumer 2 Streamer A
61. https://goo.gl/28tBqA Dem o
 tim e!
62. +
63. Uhm… NO!
64. https://github.com/arnaud-lb/php-rdkafka
65. https://github.com/weiboad/kafka-php
66. https://goo.gl/45PJ2o Feedback collection
67. Feedback Collection
70. … The big and scary
 application - Channel 5 The big and scary
 application - Channel 0
71. … Feedback Collection The big and scary
 application - Channel 5 The big and scary
 application - Channel 0
72. … Feedback Collection The big and scary
 application - Channel 5 The big and scary
 application - Channel 0
74. Feedback Collection Feedback Consolidation Feedback Processing Topic A Topic B Topic C
75. It’s not the end! https://goo.gl/Uv7KyB
76. Lessons https://goo.gl/uDPLPA
77. Constraints https://goo.gl/Nxo8nb
78. Domain exploration https://goo.gl/jyxuVs
79. “Organisations which design systems (…) are constrained to produce designs which are copies of the communication structures of these organisations” Melvin Conway
80. Communication https://goo.gl/fnG848
81. https://goo.gl/R6PFZa
82. Discipline https://goo.gl/fnG848
83. Luís Cobucci
 @lcobucci confidence Decomposing a live app with https://goo.gl/Nv1sV8
84. Thanks! @lcobucci