Part 2: Rethinking cache purge with a new architecture

This post details the architecture of Cloudflare's new "coreless" cache purge system, focusing on the end-to-end flow for purge by URL requests. Key components introduced include Purge Ingest workers for local validation and cache key generation, Purge Queue workers (Durable Objects) for persistent queuing and regional load balancing, Regional Autoscaler workers for managing Durable Object load, and Purge Fanout workers for efficient inter-region broadcasting. The system aims to reduce latency and increase throughput by distributing purge requests more effectively and performing local validation to filter out superfluous purges. Flexible purges are partially integrated, benefiting from edge authorization and validation.