We all know it doesn’t take much to code up a simple application in Rails with mongo. But what happens when your app is a hit with your users? Simple things which were working just fine start behaving weirdly and the next thing you know your app is sluggish, crashing every few hours when the load spikes. This talk is a summary of all the things that i have encountered while taking our product from 0 to 5000+ users handling more than a million transactions on a daily basis. It covers simple rails patterns that scale, ones that fail, design patterns and system architecture that will help have a peaceful sleep at nights, designing your datastore for scale, better background processing with sidekiq, monitoring. Attendees can learn about all the ways their can fail so that they plan ahead for them.

1. - KIRAN NARASAREDDY
CO-FOUNDER, DIRECTOR TECHNOLOGY
@AMURATECH
BUILDING FOR SCALE

2. 95M+
DOCUMENTS
2.5M+
DAILY
TRANSACTIONS

4. AUDITION YOUR MODELS!

5. AUDITION YOUR MODELS!
OPTIMISE YOUR SCHEMA FOR MOST
FREQUENT USE CASES

6. AUDITION YOUR MODELS!
LARGE NUMBER OF COLLECTIONS

7. AUDITION YOUR MODELS!
DO STI FOR THE RIGHT REASONS

8. AUDITION YOUR MODELS!
KEEP AN EYE ON DOCUMENTS SIZE

10. ITS OKAY NOT TO BE
NORMALISED)

11. ITS OKAY NOT TO BE
NORMALISED)

12. ITS OKAY NOT TO BE
NORMALISED
DO JOINS ON WRITE, NOT ON READ.

13. ITS OKAY NOT TO BE
NORMALISED
DON'T FEAR TO EMBED YOUR KID.

14. BUT..

15. SOMETIMES, ITS OKAY TO BE
NORMALISED TOO!
READ PERFORMANCE VS DATA DUPLICATION

16. SOMETIMES, ITS OKAY TO BE
NORMALISED TOO!
COMPLEX MODELLING / HIERARCHY

18. GET YOUR
PRIORITIES RIGHT!

19. MONGODB <= 2.4 / MONGOID < 4.1

20. MONGODB >= 2.6 / MONGOID >= 4.1

22. PLEASE EXPLAIN!

23. PLEASE EXPLAIN!
User
.where(email:"***")
.where(phone:"***")

24. PLEASE EXPLAIN!
User
.where(email:"***")
.where(phone:"***")
.explain()

27. PLEASE EXPLAIN!
OMIT FIELDS IF FILTRATION< 90%

28. PLEASE EXPLAIN!
COVER YOUR QUERIES

30. (SIDE)KIQ'D

31. (SIDE)KIQ'D

32. SIDEKIQ'D

33. SIDEKIQ'D

34. SIDEKIQ'D

35. SIDEKIQ'D
LOAD BALANCER... CAUSE WE ARE LAZY!

36. SIDEKIQ'D
‣ MANAGE LATENCY
‣ WORKER LOAD

38. MAY THE FORCE BE WITH YOU
KIRAN NARASAREDDY
http://kco.re / @_kcore