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Fan-out on read.

also: fan-out-on-read · pull-based feed

Building a feed at read time by fetching and merging recent posts from everyone the user follows.

the two-minute refresher

A post is written once; nothing is pushed.
Each feed read queries every followed account and merges: read amplification.
Slow for users following thousands of accounts, but great for celebrities' posts.

Where the course teaches it

W04 · Day 4Feed Cachinglearn it →

Related concepts

Fan-out on write
Hybrid fan-out