What does a circuit breaker do when calls to a dependency keep failing?

Options

• ✗ Retries each failed call until it succeeds
• ✓ Fails calls fast for a while instead of sending them, then lets a few through to test recovery Correct
• ✗ Moves the dependency to another region
• ✗ Queues calls until the dependency is back

Why

Failing fast frees the caller's threads and connections and stops piling load on a struggling dependency. After a cool-down it goes "half-open" and lets trial calls through.

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