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From "Aidan Skinner (JIRA)" <qpid-...@incubator.apache.org>
Subject [jira] Updated: (QPID-1621) Flow control fails to release credit when unacknowledge message count exceeds the low water mark
Date Thu, 12 Feb 2009 11:55:59 GMT

     [ https://issues.apache.org/jira/browse/QPID-1621?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Aidan Skinner updated QPID-1621:
--------------------------------

    Attachment: 0001-QPID-1621-add-testHighLowStarvation-to-test-this-is.patch

test case. passes against C++ broker, fails against Java broker.

> 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
>
>         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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