Building Scalable Web Apps

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BUILDING SCALABLE WEB APPS

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ABOUT ME Matías E. Fernández @matiasfrndz Head of Systems and Development

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WHAT DOES “SCALABLE” MEAN?

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≠ efficient usage of CPU ≠ efficient usage of bandwidth ≠ efficient usage of storage ≠ fast page loads in browser SCALABILITY ≠ PERFORMANCE

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WTF?

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SCALABILITY In electronics (including hardware, communication and software), scalability is the ability of a system, network, or process to handle a growing amount of work in a capable manner or its ability to be enlarged to accommodate that growth. en.wikipedia.org/wiki/Scalability

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VERTICAL VS. HORIZONTAL SCALABILITY

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VERTICAL SCALING Bigger, faster, stronger!

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HORIZONTAL SCALING Start small …

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HORIZONTAL SCALING

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HORIZONTAL SCALING Think BIG!

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WHY BOTHER? Because web startups tend to die or grow … really big!

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EXAMPLES

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YOUTUBE • Founded in 2005 in a garage • Officially launched in December 2005 with 8 million videos watched per day • 100 million views a day in July 2006 • Over 4 Billion videos viewed per day in January 2012 • 72 hours of video uploaded every minute in May 2012 x 12 in  7 month!

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YOUTUBE 1 mio 10 mio 100 mio 1'000 mio 10'000 mio 2005 2006 2012 YouTube videos watched per day Notice the logarithmic scale, bro?

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TWITTER • Founded in March 2006 • Officially launched in July 2006 • 400’000 tweets per quarter in 2007 • 100 million tweets per quarter in 2008 • 65 million tweets per day in June 2010 • 140 million tweets per day in March 2011, 1’600 tweets per second x 230 in  12 month!

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TWITTER 1'000 10'000 100'000 1'000'000 10'000'000 100'000'000 2007 2008 2010 Tweets per day Recognise the scale?

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BETTER BE PREPARED Rewriting your web app to be scalable and at the same time scale it to accommodate  a 10 to 100 fold of customers  in 12 month? Sounds like a challenge!

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PLAYING FOR TIME Strategies to Scaling out a Non-Scalable Web App Semi

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KEEP THINGS SIMPLE Add caching reverse proxy to reduce the load on your web app and server HTTP Accelerator

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WE ALL START SMALL Separate database and app server to gain CPU and I/O-performance App Server Database Server

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LET’S START THE PARTY App Servers Redundant Load Balancer w. HTTP Acc. We still need our database

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SCALE OUT vertically vertically horizontally

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SINGLE POINT OF FAILURE They call me single point  of failure

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REDUCE SPOF 2-Node Failover  Cluster highly availability ✔

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Kundenname, Präsentationstitel Nine Internet Solutions AG Albisriederstr. 243a CH-8047 Zürich Tel +41 44 637 40 00 Fax +41 44 637 40 01 [email protected] QUESTIONS?

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Kundenname, Präsentationstitel