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Jan 21, 2025 · Databases

How Bilibili Scaled Its Comment System with Multi‑Level Storage and Automatic Failover

Bilibili’s comment service, a critical component for user interaction, faces massive read‑write traffic that can overwhelm TiDB, so the team built a multi‑level storage architecture using Redis sorted‑sets for indexes and a custom Taishan KV store, adding automatic degradation, consistency mechanisms, and hedging policies to ensure high availability and performance.