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https://issues.apache.org/jira/browse/QPID-1621?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Martin Ritchie updated QPID-1621:
---------------------------------
Affects Version/s: (was: 0.5)
(was: M4)
(was: M3)
M2.1
This particular issue was actually related to M2.1 where the broker decided
that there was a low water mark which affects ALL ack modes other than NO_ACK.
The broker would stop sending messages when the High (5000 default was reached)
and then would not start sending until it was < low water mark (5000 / 2 by
default)
I'm guessing the < check was erroneous, this is unlike to affect anything post
M3 as the _prefetch_LowerWaterMark has been removed.
> 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: M2.1
> Reporter: Marnie McCormack
> Assignee: Aidan Skinner
> Attachments:
> 0001-QPID-1621-add-testHighLowStarvation-to-test-this-is.patch
>
>
> 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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