Feed caching: push, pull, and the celebrity
Why a personalised feed is hard to cache, fan-out on write versus fan-out on read, the celebrity problem and the hybrid that solves it, ranking, sharding and warming, how Twitter, Instagram and LinkedIn choose, and how to design the Instagram feed in an interview.
01 · Previously
W04 · DAY 04 · Feed Caching
Every user, a different cache.
Previously: the thundering herd
Previously, on Day 3, you tamed the thundering herd: coalescing, locks, jitter, background refresh, and serving stale while you revalidate.
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