Question 560
A logistics team verifies each Cloud Run function in isolation, but Pub/Sub retries cause duplicate shipment updates between services. Which limitation must be considered before claiming the issue is fully resolved?
Explanation
Correct Answer
Broker delivery semantics should not be confused with exactly-once business effects. This caution prevents extrapolating beyond the specific evidence or product boundary. Implementation testing must include distributed failure and retry behavior. The unresolved point should be tested using publisher/subscriber traces, retry delivery tests and shipment ledger history rather than assuming a working interface proves full compliance or resilience.
Incorrect Answers
A successful publish guarantees a subscriber applies the event exactly once. This limitation is framed as a blanket exception, but the case requires a different, narrower caution. The relevant boundary is that broker delivery semantics should not be confused with exactly-once business effects. Implementation testing must include distributed failure and retry behavior. Inspect publisher/subscriber traces, retry delivery tests and shipment ledger history.
Broker acknowledgments prevent all duplicate business work when clients crash. The proposed claim mistakes an incomplete signal or product feature for a universal guarantee. The relevant boundary is that broker delivery semantics should not be confused with exactly-once business effects. Implementation testing must include distributed failure and retry behavior. Inspect publisher/subscriber traces, retry delivery tests and shipment ledger history.
Managing a subscription automatically eliminates all application retry responsibilities. This claim exceeds the evidence and ignores an important risk or operational dependency. The relevant boundary is that broker delivery semantics should not be confused with exactly-once business effects. Implementation testing must include distributed failure and retry behavior. Inspect publisher/subscriber traces, retry delivery tests and shipment ledger history.