Design a scalable notification system that supports both individual and bulk notifications to multiple users. The system should handle different types of notifications including critical time-sensitive messages (like 1:1 chat) and promotional content (like system-generated recommendations) with appropriate delivery mechanisms. Consider scalability requirements (up to 1M notifications/second), expiration logic for different notification types, and the typical 80/20 distribution between critical and promotional notifications where promotional messages can target thousands of users simultaneously.
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Notification to support - Critical time sensitive notifications - Promotional notifications which are not time sensitive, but shouldnt be sent after promo/offer is expired. - Scale - 1 M notifications/sec - 80/20 distribution ( Critical/Promo) where the Promo notifications have a multiplier factor, a promo may be targeting thousands of customers.
Design Notification system for Simple and Bulk notification
We didn't have to focus on client side delivery just the architecture of our notification service for two things: 1. Sending notifications specific to a user for example 1:1 chat notifications 2. Sending system generated notifications for things like top 10 posts for you
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