Distributed Domain Destruction - Adventures in building distributed systems

Slide 1

Slide 1 text

DDD ADVENTURES IN BUILDING DISTRIBUTED SYSTEMS 1 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 2

Slide 2 text

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, PyCon Balkan 2019

Slide 3

Slide 3 text

WARNING 3 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 4

Slide 4 text

DDD 4 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 5

Slide 5 text

DISTRIBUTED 5 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 6

Slide 6 text

DOMAIN 6 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 7

Slide 7 text

DESTRUCTION 7 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 8

Slide 8 text

WHAT IS A DISTRIBUTED SYSTEM? 8 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 9

Slide 9 text

THE SIMPLE DEFINITON It is a system where you can distribute processing of costly tasks to other workers. By costly tasks 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, PyCon Balkan 2019

Slide 10

Slide 10 text

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, PyCon Balkan 2019

Slide 11

Slide 11 text

11 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 12

Slide 12 text

12 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 13

Slide 13 text

13 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 14

Slide 14 text

14 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 15

Slide 15 text

CONGRATULATIONS 15 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 16

Slide 16 text

FINITE EXPANSE OF THE UNOPENING WALLET 16 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 17

Slide 17 text

17 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 18

Slide 18 text

18 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 19

Slide 19 text

DAEMONS... DAEMONS EVERYWHERE 19 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 20

Slide 20 text

SUPERVISOR UPSTART SYSTEMD 20 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 21

Slide 21 text

21 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 22

Slide 22 text

LOG AND COUNT EVERYTHING 22 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 23

Slide 23 text

AGGREGATE AND SEE 23 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 24

Slide 24 text

24 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 25

Slide 25 text

STATSD 25 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 26

Slide 26 text

...BECAUSE LOGS AND COUNTERS ARE LYING TO YOU 26 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 27

Slide 27 text

WHAT HAPPENED TO 40 MILLION RECORDS, WHERE HAVE THEY GONE? 27 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 28

Slide 28 text

WHAT IS DYNAMODB? 28 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 29

Slide 29 text

TEMPORAL TABLES YOU SAY? 29 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 30

Slide 30 text

ARE WE WRITING DATA TO THE DYNAMODB? 30 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 31

Slide 31 text

THE LOGS ARE CLEAN, THE METRICS ARE GREEN 31 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 32

Slide 32 text

NO EXCEPTIONS? 32 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 33

Slide 33 text

33 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 34

Slide 34 text

WHAT THE HELL DID I JUST READ? 34 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 35

Slide 35 text

I CAN HAZ ERROR HANDLING NAO? LOL NO 35 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 36

Slide 36 text

36 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 37

Slide 37 text

THIS WORKER IS FAST, THAT WORKER IS SLOW, WHICH ONE WILL CRASH THE DATABASE, NOBODY KNOWS 37 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 38

Slide 38 text

TIMING IS EVERYTHING!111 38 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 39

Slide 39 text

39 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 40

Slide 40 text

40 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 41

Slide 41 text

BATCH PROCESSING 41 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 42

Slide 42 text

42 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 43

Slide 43 text

ABRAKAPOCUS, YOUR DISK SPACE IS GONE 43 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 44

Slide 44 text

0 BYTES FREE 44 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 45

Slide 45 text

MAKE THIS APP GREAT AGAIN AND GET THE CLIENT TO PAY FOR IT 45 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 46

Slide 46 text

46 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 47

Slide 47 text

WARNING: INDEX OUT OF BOUNDS 47 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 48

Slide 48 text

BUT WHY ISN'T THERE A SEPARATE LOG PARTITION? 48 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 49

Slide 49 text

10X 49 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 50

Slide 50 text

LIVE, AND LEARN, AND DOCUMENT... 50 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 51

Slide 51 text

WHAT DO YOU MEAN WE CAN'T SCALE? 51 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 52

Slide 52 text

LOCAL... YOU KEEP USING THAT WORD... 52 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 53

Slide 53 text

MEMORY REMEMBER TO USE IT 53 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 54

Slide 54 text

THERE IS AN S IN SUCCESS 54 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 55

Slide 55 text

55 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 56

Slide 56 text

BROWSER BUG REPRODUCTION 56 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 57

Slide 57 text

CURL REQUEST 57 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 58

Slide 58 text

OUTPUT THE LAST REQUEST/RESPONSE 58 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 59

Slide 59 text

WTF????? 59 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 60

Slide 60 text

60 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 61

Slide 61 text

61 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 62

Slide 62 text

18 HOURS TO LOCATE, 20 SECONDS TO FIX 62 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 63

Slide 63 text

LESSON IN CHAOS ENGINEERING 63 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 64

Slide 64 text

HEY LOOK, IT'S GONE... 64 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 65

Slide 65 text

LESSON IS ACTUALLY A MASTERCLASS 65 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 66

Slide 66 text

AN EMAIL A DAY KEEPS THE CHAOS MONKEY AWAY 66 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 67

Slide 67 text

SCORCHED EARTH POLICY 67 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 68

Slide 68 text

CRATES, BROWSERS AND DATABASES 68 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 69

Slide 69 text

16 CPUS 122 GB OF RAM 69 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 70

Slide 70 text

70 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 71

Slide 71 text

BARCODE SCANNERS AND KEYBOARDS DO NOT MIX 71 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 72

Slide 72 text

PARKING SPACE 72 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 73

Slide 73 text

73 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019

Slide 74

Slide 74 text

THANK YOU! SRDJAN VRANAC // [email protected] // @VRANAC 74 — Srdjan Vranac, Code4Hire, PyCon Balkan 2019