Exam AZ-300 topic 2 question 48 discussion

Once message is expired after two hours , it will be moved to deal lettering.

I believe that the reasoning behind answer 2 is the fact that successful processing of a message involves calling the complete method. This will remove the lock and delete the message immediately.

Correct

The given answer is correct

Given answer is correct

I just created a Service bus and checked the explanation in azure portal for field "Lock duration (i)": Sets the amount of time that a message is locked for other receivers. After its lock expires, a message pulled by one receiver becomes available to be pulled by other receivers. Default to 30 seconds, with a maximum of 5 minutes. From that point of view, i agree with "deleted immediately". Once a message is pulled, it will be deleted immediately. It does not make sense to keep the message further 5 minutes "locked" in the queue. Locking the message makes sense, for the case, when processing the message from a receiver, to lock the message, to avoid processing/receiving the message simultaneously by another receiver.

Answer1 is clear, It will move to DeadLetter after 2hours and stays there until manually deleted. Since by default PeekLock shall be enabled in Queue. Answer2, It will be deleted automaticallay (Meaning after read, it is declared as settlement) The receiving client initiates settlement of a received message with a positive acknowledgment when it calls Complete at the API level. This indicates to the broker that the message has been successfully processed and the message is removed from the queue or subscription. https://docs.microsoft.com/en-us/azure/service-bus-messaging/message-transfers-locks-settlement

The first box is correct because the message will be removed to the dead letter queue, and messages in the dead letter queue should be deleted manually. Refer to: https://docs.microsoft.com/en-us/azure/service-bus-messaging/message-expiration "Expired messages can optionally be moved to a dead-letter queue by setting the EnableDeadLetteringOnMessageExpiration property," "Note that there is no automatic cleanup of the DLQ. Messages remain in the DLQ until you explicitly retrieve them from the DLQ and call Complete() on the dead-letter message." But I don't agree to the second answer Because the message will be locked for max 5 minutes after read by a receiver, and deleted after completing process of the receiver, not immediately.

message is dropped after 2 hrs unless set for dead letter queue "Expired messages can optionally be moved to a dead-letter queue by setting the EnableDeadLetteringOnMessageExpiration property, or checking the respective box in the portal. If the option is left disabled, expired messages are dropped" ... see https://docs.microsoft.com/en-us/azure/service-bus-messaging/message-expiration