Estratégias para tunar sua aplicação rails

Palestra na RuPy 2014

Transcript

1. ESTRATÉGIASDE CACHE
   PARA TUNAR SUA
   APLICAÇÃO RAILS
   

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2. CIRDES HENRIQUE
   ENGENHEIRO DA COMPUTAÇÃO - UFPE
   ORGANIZADOR DO ABRIL PRO RUBY
   C0-FUNDADOR E DEV DO EVENTICK
   

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4. 335 MIL TICKETS EMITIDOS
   3600 ORGANIZADORES
   1200 EVENTOS FUTUROS
   

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5. RECIFE
   

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6. RECIFE
   

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7. O EVENTICK FICOU
   FORA DO AR

   POR 30 MINUTOS
   

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8. ANTES DA SOLUÇÃO, UM PASSO ATRÁS:
   

   MONITORAR A APLICAÇÃO
   NewRelic
   Nazar.io
   HoneyBadger
   Logentries
   Inspectlet
   The Informant
   

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9. SOA?
   

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10. SINGLE RAILS APP 

    LIKE SHOPIFY
    

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11. 70% DAS REQUISIÇÕES
    BATEM NA CACHE
    

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12. O QUE É CACHE?
    

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13. Cache é um componente que guarda
    informações de forma TRANSPARENTE

    

    para que futuras requisições

    sejam mais RÁPIDAS
    

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14. QUAL A

    CARACTERÍSTICA

    DA CACHE?
    

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15. O QUE USA CACHE?
    

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16. DO QUE É
    CONSTITUÍDA
    UMA CACHE?
    

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17. CACHE = CASH
    

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18. ARQUITETURA DE MEMÓRIA
    

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19. CACHE HIT / CACHE MISS / CACHE RATIO
    

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20. COMO MAXIMIZAR
    O CACHE HIT?
    

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21. BÉLÁDY’S ALGORITHM
    

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22. RANDOM

    REPLACEMENT

    (RR)
    

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23. LEAST-FREQUENTLY
    USED

    (LFU)
    

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24. LEAST-RECENTLY
    USED

    (LRU)
    

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25. O QUE É
    WEBCACHING?
    

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26. REQUISIÇÃO
    Rails App
    Reverse
    Proxy
    CDN Proxy
    Browser
    

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27. CACHE
    SERVER-SIDE
    CACHE
    CLIENT-SIDE
    

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28. PAGE

    CACHE
    ACTION

    CACHE
    FRAGMENT

    CACHE
    RAILS

    CACHE
    

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29. WRITE ON DISK
    BYPASS RAILS APPLICATION ENTIRE
    STATELESS PAGES
    NÃO FUNCIONA NO HEROKU
    PAGE CACHE
    

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30. PAGE CACHE
    class WeblogController < ActionController::Base
    caches_page :show, :new
    def update
    expire_page action: 'show', id: params[:list][:id]
    end
    end
    

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31. SIMILAR TO PAGE CACHE
    RUN FILTERS
    ACTION CACHE
    

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32. ACTION CACHE
    class PostsController < ActionController::Base
    caches_action :show, expires_in: 1.hour
    end
    

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33. DEPRECATED
    

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34. HTML CACHE AVAILABLE IN RAILS 4
    FRAGMENT CACHE
    

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35. RAILS CACHE
    FRAGMENT AND ACTION CACHE BUILD ON RAILS.CACHE
    CONFIG.ACTION_CONTROLLER.PERFORM_CACHING = TRUE
    

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36. ActiveSupport::Cache::Store
    FileStore
    MemoryStore
    NullStore
    MemCacheStore
    

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37. HOW TO USE IT
    Rails.cache.write 'foo', 'bar'
    Rails.cache.fetch 'foo'
    Rails.cache.write :foo, {a: 'b'}
    

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38. FRAGMENT CACHING
    Rais.cache.fetch 'key',
    expires_in: 5.minutes,
    race_condition_ttl: 10.seconds do
    #code
    end
    

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39. FRAGMENT CACHING
    <% cache "event-#{event.id}" do %>
    <%= render event %>
    <% end %>
    

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40. FRAGMENT CACHING
    <% cache “event-#{event.id}”, expires_in: 1.year do %>
    <%= render event %>
    <% end %>
    

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41. FRAGMENT CACHING
    def update
    expire_fragment("event-#{event.id}")
    end
    

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42. FRAGMENT CACHING
    <% cache [:recent, event] do %>
    <%= render event %>
    <% end %>
    

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43. FRAGMENT CACHING
    ACTIVESUPPORT::CACHE.EXPAND_CACHE_KEY [:RECENT, EVENT]
    => "RECENT/EVENTS/12510-20141128131506743910000"
    

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44. FRAGMENT CACHING
    <% cache :recent_attendees, expires_in: 5.minutes do %>
    <%= render partial: 'recent',
    collection: Attendees.recent %>
    <% end %>
    

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45. FRAGMENT CACHING
    <% cache(cache_key_for_attendees) do %>
    <%= render partial: 'recent', collection:
    Attendees.recent %>
    <% end %>
    

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46. FRAGMENT CACHING
    module AttendeesHelper
    def cache_key_for_attendees
    count = Attendee.count
    max_updated_at =
    Attendee.maximum(:updated_at).try(:utc).try(:to_s, :number)
    "attendees/all-#{count}-#{max_updated_at}"
    end
    end
    

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47. FRAGMENT CACHING
    <% cache(cache_key_for_attendees) do %>
    <%= render partial: 'recent', collection:
    Attendees.recent %>
    <% end %>
    

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48. PROBLEMA
    COM TEMPLATE
    

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49. CACHE Digests
    
    <% cache ["v1", @event] do%>
    Team: <%= @event.title %>
    <%= render @event.attendees %>
    <% end %>
    
    <% cache ["v1", attendee] do %>
    <%= attendee.name %>
    <%= attendee.email %>
    <% end %>
    

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50. CACHE Digests
    

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51. CACHE Digests
    

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52. RUSSIAN

    DOLL
    

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53. Russian Doll
    

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54. Russian Doll
    <% cache(cache_key_for_attendees) do %>
    All available attendees:
    <% Attendee.all.each do |a| %>
    <% cache(a) do %>
    <%= a.name %>
    <% end %>
    <% end %>
    <% end %>
    

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55. KNOWING IS

    NOT ENOUGH
    WE MUST APPLY
    

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56. WILLING IS

    NOT ENOUGH
    WE MUST DO
    

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