Multiple ChoiceIntermediate 45s
Fan-Out on Write vs Read
Which scenario most favors fan-out on read over fan-out on write for a news feed?
Options
- 1A small private group with only a dozen members, where each person follows all the others' posts
- 2A feed where the absolute worst-case read latency must never exceed fifty milliseconds for any user
- 3A feed where users follow no one at all and only ever read back their own previously published posts
- 4A celebrity with tens of millions of followers, where writing a post to every inbox is prohibitively expensive
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