Building a 500K req/s IP Geolocation Service: Radix Trees, .NET 10, and the Pursuit of Sub-5ms Latency
Story behind this blog post A couple of months ago, a friend of mine approached with with a challenging problem: build a service that can identify Iranian ISPs from IP addresses at extreme scale. The requirements were brutal: Around 500,000 requests per second with P99 latency under 5 milliseconds. As a reference for the data load, Iran has about 10,000,000 (Ten Million) IPs allocated across roughly 50,000 CIDR ranges and the system was gonna be in the hot path of a veryu high-load environment. ...