Find Nearby Friends | System Design
Let’s look at how you can design a Nearby Friends feature similar to Facebook. We talk about web sockets, Redis caches, channels, and databases like MySQL and Cassandra!
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00:00 Announcements
01:28 Features
02:11 High-level Design
04:00 WebSockets
06:42 Calculate Scale
08:18 Redis Channels & Kafka
10:30 Use Redis Channels to push updates to clients
13:50 Location Updates using Redis Channels
16:22 Caches for User Location
18:40 Finding offline & far away friends
19:44 Database for persistent storage of location data
21:20 Cassandra Database
24:15 Final Review
26:40 Outro
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