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FREE · TOPIC 044

Chat And Messaging System Design

2584 words·Updated 2026-08-28·

#system-design#messaging#chat#case-study

Primary References & Engineering Sources

·[[wiki/websockets-vs-sse-vs-long-polling]]
·[[wiki/realtime-database-and-websocket-scaling]]
·[[wiki/distributed-id-generation]]
·[[wiki/newly-unread-indicator]]
·[[wiki/direct-to-object-storage-upload]]
·[[wiki/fanout-patterns]]
·[[wiki/notification-system-design]]
·[[wiki/retries-timeouts-idempotency]]
·[[wiki/keyset-pagination]]
·[[wiki/hot-partitions]]
·[[wiki/queue-lag]]
·[[wiki/sharding-and-partitioning]]
·https://discord.com/blog/how-discord-stores-trillions-of-messages
·https://blog.whatsapp.com/1-million-is-so-2011

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