Fanout in Social Media

Fanout is a process of delivering a post to all friends on a social media platform. There are two types of fanout models: push and pull. In the push model, the news feed is pre-computed and pushed to friends immediately. In the pull model, the news feed is generated in real-time and can be pulled by friends. A hybrid approach can be used to get benefits from both approaches without pitfalls. The hotkey problem associated with fanout on write can be mitigated using consistent hashing.

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