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The Architecture of Stack Overflow - Merge Lisbon 2014
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Marco Cecconi
September 26, 2014
Programming
4
400
The Architecture of Stack Overflow - Merge Lisbon 2014
The Architecture of Stack Overflow slides from Merge Lisbon 2014
Marco Cecconi
September 26, 2014
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Transcript
The Architecture Of Marco Cecconi @sklivvz http://sklivvz.com
Sizing up the problem
None
None
None
*source: Quantcast, Alexa #50-‐ish network for traffic* (between imdb.com
and t.co)
#50-‐ish network for traffic* …and #17 in Portugal!?
*source: Quantcast, Alexa much successful very traffic obrigado, yo!
543,255,552 pageviews in the last 30 days* *source: Quantcast
Our datacenter?
None
web servers load balancers redis search database http(s) http rest
http protobuf sql sql protobuf tag engine
None
We are sNll scaling up!
Our development cycle
BAT!CAVE Code-build-test cycle running on home machine feature requests
BAT!CAVE DEV.SO Test on the real servers git push
BAT!CAVE DEV.SO META.SE 1-click deploy Users test on meta.stackexchange.com (“baking”)
git push
BAT!CAVE DEV.SO META.SE 1-click deploy HALP! git revert git push
BAT!CAVE DEV.SO NETWORK META.SE 1-click deploy git push 1-click deploy
It’s live! Tons of users use it…
BAT!CAVE DEV.SO NETWORK META.SE 1-click deploy git push 1-click deploy
…and provide new feature requests
Move fast and break things* * Not the home
page or question page :-)
Move fast and break things* * Not the home
page or question page :-)
Abusing caching
Network Level Caches (CDN, etc.) Server Level Cache (HttpRuntime.Cache) Site
Level Cache (Redis) SQL Server Database Cache (384 gigs of RAM!) Solid State Disk
None
None
None
RisoQo & SpagheS
None
None
None
None
None
Throwing away risotto… one grain at a time!
Abuse caching for GC performance
IRepository<Order> orderRepository = container.Resolve<IRepository<Order>>();
Order order = orderRepository.Get(35); This is what you think you are doing…
…but if you think about it a bit more…
...this is what you are actually doing! IRepository<Order> repository =
new ValidatingOrderRepository ( new SecurityRepository<Order> ( new LoggingRepository<Order> ( new CachingRepository<Order> ( new NHibernateRepository<Order> () ) ) ) ); Order order = repository.Get(35);
Throwing away spaghetti… one strand at a time!
Dependency InjecNon is our version of spagheS code
Our source code
Few projects :-)
Few projects :-) Few lines of code :-)
Few projects :-) Few lines of code :-) Eeek! very
few tests :-S
Few projects :-) Few lines of code :-) Awesome community
to help :-D Eeek! very few tests :-S
YAGNI* * You Ain’t Gonna Need It!
Libraries and open source
None
None
None
Wrap code in libraries and open source it
None
None
None
“SUPERHERO” CODING
HIRE “NINJA” CODERS
TOOLS LEVEL: “NINJA”
• Performance is a feature • Always.
Be. Shipping. • Use your circumstances. • Open source your libraries • 3 obscenely big monitors. KEY TAKEAWAYS
None
Marco Cecconi @sklivvz http://sklivvz.com we are hiring new ninjas from
anywhere in the world!