[APLO-86] Subscription with exclusive:true and auto-delete:true should not redeliver messages

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.0-beta6
• Assignee: Hiram R. Chirino
• Reporter: Lionel Cons
• Created: 01/Sep/11 13:20
• Updated: 30/Nov/11 16:12
• Resolved: 06/Sep/11 14:06

Description

The exclusive and auto-delete subscription options can be combined to create a private reply queue.

The current Apollo snapshot does not seem to always delete unconsumed messages, allowing a rogue client to consume them.

My test scenario:

• c1 subscribes to /queue/foo with exclusive:true and auto-delete:true and ack:client
• c1 sends messages with the appropriate reply-to header, expecting replies to go to /queue/foo
• (rogue) c2 subscribes to /queue/foo with the intent to steal messages, it does not get any because of exclusive:true
• c1 receives and acks messages and then decides to quit
• there are not yet delivered or not yet acked messages in the queue
• c1 unsubscribes and disconnects
• the broker delivers the pending messages to c2 before/while deleting the queue

IMHO, the broker should not deliver messages to c2 in this situation.

The best solution is probably to forbid subscribing to a queue that has a subscription with both exclusive:true and auto-delete:true.