Caching in Ruby

Transcript

1. Caching with Ruby Hoa.N + Luong.V
2. Outline 1. What is cache/caching 2. Caching with Ruby/Rails (Framework and Language level)
3. What is cache/caching 1. Cache ? Why ? 2. The good the bad the ugly 3. Different levels of cache
4. Why do we cache? But what is a cache?
5. Cache/Caching In computing, a cache is a hardware or software component that stores data so that future requests for that data can be served faster; the data stored in a cache might be the result of an earlier computation or a copy of data stored elsewhere // Wikipedia
6. Cache/Caching Precompute and serve content superfast // Luong
7. Why do we cache precompute and serve content superfast? - Improve Application Performance - Reduce database cost - Reduce load on backend - Predictable performance - Eliminate Database Hotspots - Increase Read Throughput
8. Facebook TAO model - https://www.facebook.com/notes/facebook-engineering/tao-the-power-of-the-graph/10151525983993920/
9. Twitter timeline - https://www.infoq.com/presentations/Twitter-Timeline-Scalability
10. Reddit
11. The good the bad the ugly https://github.com/reddit-archive/reddit/blob/master/r2/r2/lib/db/queries.py
12. Caching is hard There are only two hard things in Computer Science: cache invalidation and naming things. -- Phil Karlton - Cache invalidation - Code complexity - More resources to manage - Hard to fix data related bugs - ....
13. Different levels of cache
14. Application Caching
15. CDN caching
16. Browser caching
17. CDN caching
18. Caching with Ruby/Rails 1. Outdated caching mechanism 2. Memoization 3. Thread-safe in-memory with Ruby/Rails 4. Low-level caching 5. SQL caching
19. OUTDATED CACHING MECHANISM
20. 1. PAGE CACHING 2. ACTION CACHING 3. RUSSIAN CACHING OUTDATED CACHING MECHANISM
21. Memoization
22. Memoization https://github.com/Thinkei/eh-monitoring/blob/master/lib/eh_monitoring
23. https://api.rubyonrails.org/v3.1/classes/ActiveSupport/Memoizable.html
24. Thread-safe in-memory with Ruby/Rails
26. Using the current thread to cache the value you want
27. And this is how this mechanism has been applied in Rails https://github.com/rails/rails/blob/b9ca94caea2ca6a6cc09abaffaad67b447134079/activesupport/lib/active_support/core_ext/ module/attribute_accessors_per_thread.rb#L145
28. LOW LEVEL CACHING
29. LOW LEVEL CACHING
30. LOW LEVEL CACHING
31. SQL LEVEL CACHING
32. SQL LEVEL CACHING
33. Q & A
34. THANK YOU