System Design Patterns: From Fundamentals to Real Systems
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CDN

1. The Incident

The store launches in Australia. The marketing works. The site does not. Sydney customers report page loads of six seconds. The same pages load in 400 ms from the office in Virginia, where the servers live.

Engineering investigates and finds nothing wrong. Origin response time is 20 ms. The origin is the server that holds the real content. No errors, no saturation. The six seconds are made of something no dashboard shows: distance.

Sydney to Virginia is about 200 ms round trip

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