Why Git's packfile architecture failed at 30,000 merges/day (600 PB/day CI traffic)—and how Anthropic replaced it with Scion on Cloud Spanner [11:21]https://www.reddit.com/r/programming/comments/1xbgkn7/why_gits_packfile_architecture_failed_at_30000
Here is an architectural summary (TL;DW) of the system design and metrics covered in the video for anyone who prefers reading first: The Scale & Why Git Choked Merge Velocity: Between May and Sept 2026, Anthropic's monorepo went from 2,500 merges/day to 30,000+ merges/day (~1 merge every 2.8 seconds) due to autonomous agent workflows. The 600+ PB/Day CI Bottleneck: With a ~100 GB main branch history, a 25 GB working copy, and 25,000,000 daily CI checkouts , naive Git checkout traffic exceeded 600 PB/day . Packfile & Mirror Saturation: Git's offline-first DAG and packfile negotiation model was…