Distributed Domain Destruction - Adventures in building distributed systems

For the last few years I have been building, maintaining and fighting a few projects that make use of distributed computing, parallel processing, message brokers, queues and workers. This is one of those "from the trenches" talks, where I will regale you with tales about the series of unfortunate events that may happen as your application grows in complexity. Tales like disk space fluctuations, importance of logging, NoSql problems, restructuring your order of execution in code for performance gains, short sighted albeit logical architectural decisions that will cost you in the long run.

Come hear about the agony you will experience when it starts falling apart, and the thrill you will feel when everything is running juuust right.

Transcript

1. DDD ADVENTURES IN BUILDING DISTRIBUTED SYSTEMS 1 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
2. business owner, developer, consultant, mercenary, writing terrible code that performs exceptionally, wrangling elePHPants and Pythons, obsessed with process automation, interested in continuous integration and delivery, clean code, testing, best practices and distributed systems 2 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
3. WARNING 3 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
4. DDD 4 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
5. DISTRIBUTED 5 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
6. DOMAIN 6 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
7. DESTRUCTION 7 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
8. WHAT IS A DISTRIBUTED SYSTEM? 8 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
9. THE SIMPLE DEFINITON It is a system where you can distribute processing of costly tasks to other workers. By costly taks I mean anything ranging to heavy computation and cpu utilization to long running processes. If we are talking in the context of web applications, basically anything that can't be done within a request is a candidate for distribution/background processing. 9 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
10. A MORE REALISTIC DEFINITION A distributed system is one in which the failure of a computer you didn't even know existed can render your own computer unusable. — Leslie B. Lamport, 1987 10 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
11. 11 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
12. 12 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
13. 13 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
14. 14 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
15. CONGRATULATIONS 15 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
16. FINITE EXPANSE OF THE UNOPENING WALLET 16 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
17. 17 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
18. 18 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
19. DAEMONS... DAEMONS EVERYWHERE 19 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
20. SUPERVISOR UPSTART 20 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
21. 21 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
22. LOG AND COUNT EVERYTHING 22 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
23. AGGREGATE AND SEE 23 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
24. 24 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
25. STATSD 25 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
26. ...BECAUSE LOGS AND COUNTERS ARE LYING TO YOU 26 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
27. WHAT HAPPENED TO 40 MILLION RECORDS, WHERE HAVE THEY GONE? 27 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
28. WHAT IS DYNAMODB? 28 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
29. TEMPORAL TABLES YOU SAY? 29 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
30. ARE WE WRITING DATA TO THE DYNAMODB? 30 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
31. THE LOGS ARE CLEAN, THE METRICS ARE GREEN 31 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
32. NO EXCEPTIONS? 32 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
33. 33 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
34. WHAT THE HELL DID I JUST READ? 34 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
35. I CAN HAZ ERROR HANDLING NAO? LOL NO 35 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
36. 36 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
37. THIS WORKER IS FAST, THAT WORKER IS SLOW, WHICH ONE WILL CRASH THE DATABASE, NOBODY KNOWS 37 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
38. TIMING IS EVERYTHING!111 38 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
39. 39 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
40. 40 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
41. BATCH PROCESSING 41 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
42. 42 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
43. ABRAKAPOCUS, YOUR DISK SPACE IS GONE 43 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
44. 0 BYTES FREE 44 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
45. MAKE THIS APP GREAT AGAIN AND GET THE CLIENT TO PAY FOR IT 45 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
46. 46 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
47. WARNING: INDEX OUT OF BOUNDS 47 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
48. BUT WHY ISN'T THERE A SEPARATE LOG PARTITION? 48 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
49. 10X 49 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
50. LIVE, AND LEARN, AND DOCUMENT... 50 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
51. WHAT DO YOU MEAN WE CAN'T SCALE? 51 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
52. LOCAL... YOU KEEP USING THAT WORD... 52 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
53. MEMORY REMEMBER TO USE IT 53 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
54. THERE IS AN S IN SUCCESS 54 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
55. 55 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
56. BROWSER BUG REPRODUCTION 56 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
57. CURL REQUEST 57 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
58. OUTPUT THE LAST REQUEST/RESPONSE 58 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
59. WTF????? 59 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
60. 60 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
61. 61 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
62. 18 HOURS TO LOCATE, 20 SECONDS TO FIX 62 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
63. CRATES, BROWSERS AND DATABASES 63 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
64. 16 CPUS 122 GB OF RAM 64 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
65. 65 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
66. BARCODE SCANNERS AND KEYBOARDS DO NOT MIX 66 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
67. 67 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main
68. THANK YOU! SRDJAN VRANAC // VRANAC@CODE4HIRE.COM // @VRANAC 68 — Srdjan Vranac, Code4Hire, PHP-Usergroup Frankfurt Am Main