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System Design: Notifying 50 Million Users in One Shot 🔔
50 Million Notifications, One Message 📲 Sending a flash sale alert to every user sounds simple until you do the math on polling. This one explains it with a real example: the server load polling creates, and how FCM's pub/sub topic avoids sending millions of individual messages. You'll learn why polling doesn't scale, why topics are the fix ...
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