Definition
Open-source Rust consistent hashing library used in Cloudflare Pingora Backend Router — optimized September 2026 to reclaim >100TB global RAM.
Optimizations (Sep 2026)
- Point struct: 8 → 6 bytes via compact encoding
- Hash count: ~90% reduction per server via statistical analysis (CV proves diminishing returns beyond ~160 hashes)
- Dual-ring migration: gradual rollout avoiding cache invalidation
v2 cargo feature provides backward-compatible access.