[AMQ-9595] Durable subscriber receives acknowledge messages if they are farther than the maxBatchSize

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 6.1.3, 5.18.6
• Fix Version/s: 6.2.0, 6.1.4, 5.18.7
• Component/s: KahaDB
• Assignee: Jean-Baptiste Onofré
• Reporter: Nikita Shupletsov
• Created: 18/Oct/24 22:16
• Updated: 26/Oct/24 20:47
• Resolved: 23/Oct/24 13:49

Description

Let's say we have a topic with 2 durable subscribers:

•  we send 10000 messages to the topic.
• First subscriber receives all messages, and acknowledges every second of them(0th,  2nd, 4th and so on)
• Second subscriber doesn't acknowledge anything
• we restart the broker
• first subscriber connects to the broker and starts receiving messages
• at first it receives correct messages(1st, 3rd, 5th and so on), but at some point it starts receiving all messages(400th, 401st, 402nd and so on).

See a test in the attachment