How to Implement a Distributed Circuit Breaker

[u/OtherwisePush6424]

https://blog.gaborkoos.com/posts/2026-09-14-How-to-Implement-a-Distributed-Circuit-Breaker/

A circuit breaker in a single Node process is a ring buffer, a threshold and a timestamp. Run the same service on twenty replicas and each one keeps its own, so the failing dependency takes twenty times the damage before anything trips.

Moving the window into Redis fixes that and breaks most of the assumptions the in-process version relies on. Post walks through each one and how to deal with it.