What happens when an Anypoint MQ circuit breaker is in the open state?

• A. The Subscriber source continues to retrieve messages normally.
• B. The Subscriber source stops retrieving messages and skips the message silently until the configured trip timeout occurs.
• C. The Subscriber source immediately retries the last failed message.
• D. The Subscriber source switches to half-open and tests messages.

Answer: (B)

When the circuit breaker is open, the system is in a protective pause to prevent further strain on a failing downstream. For Anypoint MQ, that means the subscriber source stops retrieving messages and silently skips the current message until the configured trip timeout elapses. This pause gives the problematic component time to recover, and after the timeout the circuit breaker can begin a half-open probe to test if the path is healthy again. The behavior described here matches the open-state intention: no more normal retrieval, with a silent skip until the timeout.