Circuit Breaker State Machine

Simulate downstream failure cascades. Observe the 3-state lifecycle (CLOSED → OPEN → HALF_OPEN) preventing thread exhaustion.

Circuit Breaker Lifecycle

1. CLOSED

Healthy

Passes all RPCs

2. OPEN

Tripped

Fast-fails RPCs

3. HALF-OPEN

Canary Trial

Probing recovery

Sliding Window (Last 5 Calls)

EMPTY

Failures in current window: 0 / 3 threshold

[INIT] Circuit Breaker initialized in CLOSED state.

[CONFIG] Threshold: 3 failures in sliding window -> trips OPEN for 5s cooldown.

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