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https://issues.apache.org/jira/browse/QPID-1621?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12672664#action_12672664
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Aidan Skinner commented on QPID-1621:
-------------------------------------
The test for this looks like:
A: send 5001 messages (receive high watermark+1)
B: recieve 2501 (low watermark +1)
commit
while (receive != null)
commit
no messages after 5000 will arrive
> Flow control fails to release credit when unacknowledge message count exceeds
> the low water mark
> ------------------------------------------------------------------------------------------------
>
> Key: QPID-1621
> URL: https://issues.apache.org/jira/browse/QPID-1621
> Project: Qpid
> Issue Type: Bug
> Components: Java Broker
> Affects Versions: M3, M4
> Reporter: Marnie McCormack
> Assignee: Aidan Skinner
> Fix For: M5
>
>
> Summary:
> If we receive more than 2500 msgs on a transacted session then we cannot
> recover that credit and will block at the prefetch limit of 5000.
> Acknowledging at msg 2501 demonstrates this issue (of being limited to 5000
> mgs) but at <2500 then we are able to receive as many messages as are
> available, beyond 5000.
> This issue has been seen on Qpid M3, further extraction of a test case and
> testing on M4 is required.
> The test should also adjust the low water mark to identify if that is part of
> the issue.
> Workaround:
> To prevent client starvation ensure that clients never have more than the low
> water mark (2500 default) of unacked messages.
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