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https://issues.apache.org/jira/browse/QPID-1909?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12898318#action_12898318
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Jonathan Robie commented on QPID-1909:
--------------------------------------
Fixed in QPID-1909.patch, attached.
> Consumer with byte credit can get ignored if a large message "eclipses" a
> small one.
> ------------------------------------------------------------------------------------
>
> Key: QPID-1909
> URL: https://issues.apache.org/jira/browse/QPID-1909
> Project: Qpid
> Issue Type: Bug
> Components: C++ Broker
> Affects Versions: 0.5
> Reporter: Alan Conway
> Assignee: Jonathan Robie
> Attachments: QPID-1909.patch
>
>
> Given: A consumer with byte credit N for a queue with messages Big size > N
> and Small size < N
> The consumer should not be able to consume Big. Now remove Big with a
> different consumer.
> The consumer should now be able to consume Small, but doesn't
> The problem in Queue.cpp is twofold:
> - if a consumer returns "false" from accept, it is assumed to be blocked and
> is removed from the listener set. It won't be notified of new messages
> - the queue only notifies when new messages arrive. It does not notify when
> a blocking message is removed.
> This is demonstrated by adding the following to test_credit_flow_bytes in
> message.py:
> # Check for bug that allowed a small message to be hidden by a
> larger one.
>
>
> session.message_transfer(message=Message(session.delivery_properties(routing_key="q"),
> "toobigtoobigtoobigtoobig"))
>
> session.message_transfer(message=Message(session.delivery_properties(routing_key="q"),
> "abcdefgh"))
> session.message_flow(unit = session.credit_unit.byte, value =
> msg_size, destination = "c")
> try:
> q.get(timeout = 1) # Should fail, message is too big.
>
>
> self.fail("Expected Empty exception")
> except Empty: None
> # Create another consumer to remove the large message
>
>
> session.message_subscribe(queue = "q", destination = "c2")
> session.message_flow(unit = session.credit_unit.byte, value =
> 0xFFFFFFFFL, destination = "c2")
> session.message_flow(unit = session.credit_unit.message, value = 1,
> destination = "c2")
> self.assertDataEquals(session, session.incoming("c2").get(timeout=1),
> "toobigtoobigtoobigtoobig")
> # Now the first consumer should be able to receive the smaller
> message.
>
> self.assertDataEquals(session, q.get(timeout = 1), "abcdefgh")
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