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https://issues.apache.org/jira/browse/QPID-3488?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gordon Sim resolved QPID-3488.
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Resolution: Fixed
Fix Version/s: 0.13
> Setting receiver capacity to zero does not always stop the message flow
> -----------------------------------------------------------------------
>
> Key: QPID-3488
> URL: https://issues.apache.org/jira/browse/QPID-3488
> Project: Qpid
> Issue Type: Bug
> Components: C++ Broker
> Reporter: Jason Dillaman
> Assignee: Gordon Sim
> Priority: Minor
> Fix For: 0.13
>
>
> Calling "setCapacity(0)" on a receiver sends out a MessageStopBody to the
> broker, which in turns causes the broker to reset the credits to zero.
> However, there is a potential race condition if any MessageTransferBody
> completions for the same receiver are later sent to the broker. When the
> broker receives the completions, it will increase the credit, resulting in
> additional messages being transferred to the receiver.
> Steps to reproduce:
> 1) Create a receiver and set a non-zero capacity
> 2) Receive one or more messages from the receiver
> 3) Set the receiver capacity to zero
> 4) Release the accepted messages back to the broker
> 5) Ensure that the session sends a completion (e.g. have another receiver on
> the session w/ capacity 1 and get a single message)
> Actual Results:
> The receiver will receive additional messages since its credit was increased
> on the broker
> Expected Results:
> The receiver will not receive additional messages
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