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: for pages that load in 400 ms from the office in Virginia, where the servers live.

Engineering investigates and finds... nothing wrong. Origin response time: 20 ms. No errors, no saturation. The six seconds are made of something no dashboard shows: distance. Sydney to Virginia is about 200 ms round trip: the arithmetic lesson's cross-region round-trip cost, paid in full

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