Fan-Out on Write vs Fan-Out on Read

Fan-Out on Write vs Fan-Out on Read

When someone posts, do you push the update into every follower feed (fan-out on write) or assemble the feed when they open the app (fan-out on read)? Same idea as Twitter timelines — write is fast to read, read is cheaper to write.

Fan-Out of Read

to understand this concpet in detail watch: 1. Notification system design 2. Fan-out on Write vs Fan-Out on Read 3. this blog Comment 'LINK'

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Fan-out on Write vs Fan-out on Read.

Rahul. - Hello ├── A ├── B └── C

Rahul posts ↓ A's Feed ← Hello B's Feed ← Hello C's Feed ← Hello

Fan-out on Write

. - Hello ├── A ├── B └── C ├── D ├── F └── . . . . .

Application server