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https://issues.apache.org/jira/browse/QPID-3562?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13152359#comment-13152359
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Robbie Gemmell commented on QPID-3562:
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I would probably have chosen to test prefetch=0 and preftech=1 in isolation
rather than in the same test, but it seems reasonable enough (I would consume
'Msg3' for completeness though). The Javadoc mentions 3 more messages but the
test sends 5 more.
I dont think it covers this JIRA at all though, given the use of synchronous
consumers and the different handling of prefetch from onMessage that goes along
with that being what prompted the JIRA to be raised.
> the 0-10 client path does not act as expected with asynchronous consumers
> using a prefetch of 1 on transacted sessions
> ----------------------------------------------------------------------------------------------------------------------
>
> Key: QPID-3562
> URL: https://issues.apache.org/jira/browse/QPID-3562
> Project: Qpid
> Issue Type: Bug
> Components: Java Client
> Affects Versions: 0.12
> Reporter: Robbie Gemmell
> Assignee: Robbie Gemmell
> Fix For: 0.13
>
>
> the 0-10 client path does not act as expected with asynchronous consumers
> using a prefetch of 1 on transacted sessions, as the client is able to hold a
> 2nd message during processing of a slow onMessage handler. This is because
> completions are sent to ensure credit does not dry up, allowing a
> large-than-prefetch number of messages to be consume in a given transaction.
> However, this is done prior to delivery to the client application, which
> causes the client to get sent a 2nd message by the broker.
> This should isntead occur after delivery has completed (if it is necessary:
> the client may have committed, which sends accepting completions anyway) to
> give the expected behaviour.
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