Design a Cache for a Product Database · System Design Interview

Design a Cache for a Product DatabaseDesign the cache in front of an online shop’s product database: almost every page reads from it, the database could not take that load on its own, and a price change must not linger.What it has to do

Product reads are served from the cache, falling back to the database on a miss

An updated product is not served stale for more than a few seconds

Losing a cache node does not overload the database

Scale

Product reads per second at peak: 500,000

Products: 50 million

Out of scope

The product database itself

Caching whole pages at the CDN

Personal data such as carts

Practise this challengeAll system design challenges

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