Does scheduled message included in the Azure Service Bus Queue quota?

Question

From the docs, I understand that the maximum size of a queue can go is 80 GB. However, it is not stated whether scheduled message is counted toward the same limit.

Given the understanding that scheduled message does not materialize in the queue until the scheduled time, it seems safe to assume the answer to my question is no. However, I feel like some sort of limit would be in place for scheduled message one way or another.

Appreciate any pointers/ clarifications on this.

Thank you.

Regards,
Ivan

Answer 1

@Ivan Tioh Thanks for reaching out.

When you scheduled the message the state of the message is Scheduled but it still resides on the queue/topic and the schedule message will add to the total limit. As the message is not in the active state the client doesn't consume those messages. Scheduled messages and their sequence numbers can also be discovered using message browsing.

Once the enqueue scheduled time UTC clicks in then the jobs running at the backend changes the state of the message from Scheduled to Active state. Once the message becomes active in case of topic the messages will now be forwarded to all the subscription and based on the filter condition the subscription will accept/discard those message. In case of queue the message is visible when the state changes to active and now your client can consume those messages from queue/subscription.

For more details on schedule messages, you can refer to this document. Feel free to get back to me if you have any queries or concerns.