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L'architettura di Stack Overflow, {codemotion} ...
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Marco Cecconi
November 29, 2014
Programming
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L'architettura di Stack Overflow, {codemotion} Milano 2014
L'architettura di Stack Overflow, presentata a {codemotion} Milano in Novembre 2014.
Marco Cecconi
November 29, 2014
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Transcript
Marco Cecconi @sklivvz http://sklivvz.com
ARCHITETTURA? CHE E’?
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Cresciuti a 130 siti (+20%) Da 56º a 44º network
più visitato al mondo (-12)
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*source: Quantcast, Alexa ~50º network per traffico* (fra imdb.com
e t.co)
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http://stackexchange.com/performance
Agile
BAT!CAVERNA Ciclo scrivi-compila-testa sul computer di casa Richieste feature
DEV.SO Test su server di produzione git push BAT!CAVERNA
BAT!CAVE DEV.SO META.SE Utenti testano su meta.stackexchange.com (“baking”) git push
BAT!CAVERNA 1-click deploy
DEV.SO META.SE AZZ! git revert git push BAT!CAVERNA 1-click deploy
DEV.SO NETWORK META.SE 1-click deploy git push 1-click deploy In
produzione! Tonnellate di utenti lo usano… BAT!CAVERNA
BAT!CAVE DEV.SO NETWORK META.SE 1-click deploy git push 1-click deploy
…e richiedono nuove feature! BAT!CAVERNA
Vai veloce e scassa le cose* * Non la
home page o pagine domande :-)
Vai veloce e scassa le cose* * Non la
home page o pagine domande :-)
Abuso dell’uso della cache
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Il nostro amico/nemico: Il Garbage Collector (“spazzin”)
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Abusiamo della cache per aiutare il GC
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Abusiamo del compilatore per aiutare il GC
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IRepository<Order> orderRepository = container.Resolve<IRepository<Order>>();
Order order = orderRepository.Get(35); La buona, vecchia dependency injection
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IRepository<Order> repository = new ValidatingOrderRepository (
new SecurityRepository<Order> ( new LoggingRepository<Order> ( new CachingRepository<Order> ( new NHibernateRepository<Order> () ) ) ) ); Order order = repository.Get(35);
Il nostro sorgente
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YAGNI* * You Ain’t Gonna Need It!
Librerie e open source
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Wrap code in libraries and open source it
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PROGRAMMAZIONE DA “SUPEREROI”
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LIVELLO STRUMENTI: HATTORI HANZŌ
• La performance è una feature •
Always. Be. Shipping. • Usate le vostre circostanze. • Rilasciate O/S le vostre librerie • 3 monitor grandi da far schifo. MORALE DELLA FAVOLA
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Marco Cecconi @sklivvz http://sklivvz.com Stiamo assumendo nuovi ninja da ovunque
nel mondo!