Replication: 4 real scaling case studies
4 of the 73 engineering write-ups in our database are tagged with the technique "replication". They come from 4 companies (Cloudflare, GitHub, Meta and Tailscale) and were published between 2020 and 2023. 2 of the 4 state concrete scale numbers, for example "5.5 million QPS" (GitHub). Each card below links to our short summary and the original post.
Upgrading GitHub.com to MySQL 8.0
How GitHub upgraded its whole MySQL fleet to 8.0 with staged replicas and a working rollback path.
Switching from etcd to SQLite: A Database Migration Story
Tailscale replaced etcd with SQLite plus Litestream replication for a simpler control-plane datastore.
ZippyDB: Facebook's key value store
Meta's general-purpose distributed key-value store built on RocksDB, with shard management and configurable consistency.
Introducing Quicksilver: Configuration Distribution at Internet Scale
Quicksilver replicates Cloudflare's config key-value store to every edge server in seconds, built on LMDB.