High Availability

Transcript

1. iex(1)> high_availability @sasajuric aircloak.com

2. Erlang 
 (the language) Elixir LFE Erlang VM (BEAM)

3. highly_available ≈ works_almost_always

4. optional?(highly_available) # false

5. easy?(highly_available) # false

6. None

7. highly_available do # the code here magically works end #doesntworklikethat

8. fault-tolerance scalability + responsiveness = high availability

9. A B D E F C

10. send(pid, message) A B message = receive ...

11. def loop(state) do receive do message -> new_state = handle(state,

    message) loop(new_state) end end

12. bank account balance {:deposit, amount} {:withdraw, amount} :balance amount

13. OS process or thread Erlang process

14. db connection background job request handler state request handler request

    handler request handler request handler request handler state state state background job background job background job db connection db connection db connection

15. A B C D E F

16. A exit message B C D E F

17. supervisor worker worker

18. S S S W W S W W W S

    W W

19. scheduler scheduler scheduler scheduler CPU CPU CPU CPU VM

20. VM VM VM VM VM

21. VM send(pid, message) VM 1 send(pid, message) VM 2

22. shared-nothing concurrency process crash propagation + some VM magic =

    fault tolerance
 scalability
 responsiveness
23. None

24. 3rd party data source transform data push server browsers bets

    validation

25. Data transformation 1.Receive TCP stream" 2.Assemble XML messages" 3.Update the

    model" 4.Store to database" 5.Serialize the model" 6.Dispatch

26. receive stream assemble messages update model store to database serialize

    data dispatch

27. receive stream assemble messages update model store to database serialize

    data dispatch message 6 message 5 message 4 message 3 message 2 message 1

28. receive stream assemble messages update model store to database serialize

    data dispatch

29. storing to database queuing bet odds storing bet odds

30. match 1 match 3 match 2

31. update model serialize data dispatch match 1 match 3 match

    2
32. None
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34. None
35. None
36. None