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From Gordon Sim <g...@redhat.com>
Subject Re: different release behavior in M4 CPP?
Date Wed, 11 Feb 2009 13:59:51 GMT
Adam Chase wrote:
> The way I am implementing failback using qpid is to release a message
> when I detect that the other consumer is available again via a
> message.
> When I release the message, the other consumer isn't getting it.
> If I add some credit to myself I get it again and then the next time
> the other consumer gets it.  If I kill the first consumer, the second
> gets the message immediately.
> Is this a bug or intentional?  

This is a bug I'm afraid, due to a change in the notification logic 
between queue and consumers introduced as part of a fix for QPID-1280.

After that change only one consumer gets notified of a message becoming 
available; unfortunately this does not take into account whether the 
consumer picked has credit for the message.

If you start the second consumer after the message has been released by 
the first consumer then the second consumer receives it as expected.

If you start the second consumer before the message is released, it 
doesn't get the released message unless you kill the first consumer (or 
cancel its subscription).

Also, if a second message were published, the second consumer would be 
notified of message availability and would then pick up the first message.

I have created a JIRA for this[1] and will get a fix out as soon as 

[1] https://issues.apache.org/jira/browse/QPID-1660

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