Grokking the System Design Interview, Volume II
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Step 4: High-Level Architecture

A flash sale puts a million people in front of a thousand items in the same second. The stock count of a product can safely accept only one change at a time, so everything in front of it exists to turn away, slow down or line up the crowd. We follow one buyer, Maya, who wants one pair of headphones (Product X) when the sale opens at noon.

Path 1: Maya reaches the sale

  1. The page loads from the CDN. Product images, scripts and stylesheets come from a content delivery network (CDN), a set of servers near users that cache static files

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