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From "Jason Dillaman (JIRA)" <j...@apache.org>
Subject [jira] [Created] (QPID-3488) Setting receiver capacity to zero does not always stop the message flow
Date Wed, 14 Sep 2011 23:56:09 GMT
Setting receiver capacity to zero does not always stop the message flow
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                 Key: QPID-3488
                 URL: https://issues.apache.org/jira/browse/QPID-3488
             Project: Qpid
          Issue Type: Bug
          Components: C++ Broker
            Reporter: Jason Dillaman
            Priority: Minor


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 capacity was increased on the broker

Expected Results:
The receiver will not receive additional messages

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