[jira] Commented: (QPID-1621) Flow control fails to release credit when unacknowledge message count exceeds the low water mark

["Aidan Skinner (JIRA)" <qp...@incubator.apache.org>]

    [ https://issues.apache.org/jira/browse/QPID-1621?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12672664#action_12672664 ] 

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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