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Fanout Pattern
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https://www.youtube.com/watch?v=J-5JozlYIqI&list=PLjTveVh7FakJOoY6GPZGWHHl4shhDT8iV&index=20
reqs
- deliver notifications to users in real time based on a topic which multiple users are subscribed to
- users that are offline can fetch their notifications later
if 1 billion topics and each receives 1000 notifications of 100 bytes per day… → storing 100TB per day, 30PB per year
Topics can have millions of users subscribed to them! → do we want to push thenotification to each user?
