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https://issues.apache.org/jira/browse/QPID-4171?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13425739#comment-13425739
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Robbie Gemmell commented on QPID-4171:
--------------------------------------

(I could probably be persuaded to reverse the system property so that people 
have the option to turn that behaviour on rather than off, since out blocking 
IO layer probably means it makes only a small difference to overall performance 
currently because we have to complete everything synchronously when the read is 
finished.)
                
> persistent messages from a non-transactional session can be enqueued out of 
> order
> ---------------------------------------------------------------------------------
>
>                 Key: QPID-4171
>                 URL: https://issues.apache.org/jira/browse/QPID-4171
>             Project: Qpid
>          Issue Type: Bug
>          Components: Java Broker, Java Broker BDB Store
>    Affects Versions: 0.16, 0.18, 0.19
>            Reporter: Keith Wall
>            Assignee: Keith Wall
>         Attachments: QPID-4171-scribbles.txt
>
>
> A defect in AsyncAutoCommitTransaction means that occasionally messages 
> delivered by a non-transactional JMS are seen to be enqueued out-of-order and 
> therefore delivered to a consumer out of the expected order.  
> It is this problem that underlies QPID-4014, although as I think this problem 
> is wider than ConflationQueues, I am raising this separately.

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