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https://issues.apache.org/jira/browse/AMQ-9435?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on AMQ-9435 started by Christopher L. Shannon.
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> KahaDB durable sub tracking breaks on duplicate messages
> --------------------------------------------------------
>
>                 Key: AMQ-9435
>                 URL: https://issues.apache.org/jira/browse/AMQ-9435
>             Project: ActiveMQ Classic
>          Issue Type: Bug
>    Affects Versions: 5.18.3, 6.0.1
>            Reporter: Christopher L. Shannon
>            Assignee: Christopher L. Shannon
>            Priority: Major
>             Fix For: 6.1.0, 5.18.4, 6.0.2
>
>
> There is a bug in KahaDB on message add where if a message is marked as a 
> duplicate the orderIndex next message Id is not rolled back. When a duplicate 
> is detected and ignored the index is supposed to be rolled back so that the 
> state isn't broken but in this case the sequence id is still incremented and 
> this leads to gaps in the order index sequence.
> KahaDB tracks pending messages that need to be acknowledged for durable subs 
> in a SequenceSet and that set is expected to be contiguous and if it isn't it 
> breaks. The gaps lead to the store reporting messages still exist for 
> durables and they appear as "stuck" even though there are no messages.
> The fix is to roll back the counter (this is already done in another spot) so 
> it is only incremented if the message is stored. If an existing store is 
> broken by this bug an index rebuild is likely necessary but then it wouldn't 
> come back.



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