Circuit breaker prevents cascading failures. When a service is failing, it "opens" the circuit to stop sending requests (fail-fast). After a cooldown, it lets one test request through. If it succeeds, circuit closes again.

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hardPhase 13 · Microservices Patterns 5 min read

Circuit Breaker Pattern

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How to use

1Start in CLOSED state — requests flow normally

2Click "Fail" multiple times — watch failure count increase

3When threshold hits: circuit OPENS — all requests fail-fast

4Wait for timeout → HALF-OPEN — test request goes through

5If test succeeds → back to CLOSED

In a nutshell

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