Counting things, very fast, on the Internet
summary
Builds a real‑time stats server for adaptive learning and gamified features using Redis and embedded Lua scripts, pushing changes over pub/sub to WebSockets (pusher). Claims per‑event work is denormalize‑on‑write so reads are cheap, with atomic Lua scripts providing isolation; updating ~55 keys costs ~7–8 ms, 250 keys ~7 ms in demo. Covers once‑only event guarantees, recovery by replaying short windows, and cheap leaderboard notifications when rank changes.
AI-written summary · about
chapters (8)
- 0:00Introduction
- 0:38Realtime stats
- 3:00Why use Redis
- 4:52Denormalisation
- 10:05WebSocket
- 19:23Red Redis
- 26:15Health checks
- 29:00Sets
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