What happens if the subscriber experiences concurrency contention with another client, causing its modification to fail? The modification can be retried if the subscriber does not acknowledge success to the messaging mechanism. The message will be redelivered, a new transaction started, a new attempt made to execute the necessary command, and a corresponding commit made. This retry process can continue until consistency is achieved, or until a retry limit is reached.6 If complete failure occurs, it may be necessary to compensate, or at a minimum to report the failure for pending intervention.
