Design Message Storage for a Chat App · System Design Interview

Design Message Storage for a Chat AppDesign how messages are stored and retrieved for a chat application supporting one-to-one and group conversations.What it has to do

Send a message to a conversation

Load the most recent messages in a conversation, and page backwards through history

Show which messages a participant has not yet read

Scale

Daily active users: 80 million

Messages per day: 5 billion

Out of scope

End-to-end encryption

Voice and video calls

Message search

Practise this challengeAll system design challenges

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