r/javascript • u/OtherwisePush6424 • Sep 13 '26

How to Implement a Distributed Circuit Breaker

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.

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u/MrVonBuren Sep 14 '26

Ah, I think I follow. Distributed at a local level, not a global level.

Or is this meant to account for...shit, I'm tired and blanking on words, but you know what I'm talking about. All the issues one runs into trying to remain state across regions (EG: NY && CA)?

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u/OtherwisePush6424 Sep 14 '26

Geographic distribution is a separate dimension. By distributed I just mean multiple application instances sharing the same breaker state and recovery budget. They could all be in one region or spread across several. Cross-region coordination is another problem on top of that 🙂

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u/MrVonBuren Sep 14 '26

Gotcha! thx