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https://issues.apache.org/jira/browse/QPID-7178?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15223969#comment-15223969
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Paul Loberg commented on QPID-7178:
-----------------------------------
If we change our Python client to create a receiver session (step 4 above) to
do so between steps 2 and 3 above this appears to work. This does lead us to
believe this might be the correct/intended behavior?
> Auto-delete queue removed while it has consumers
> ------------------------------------------------
>
> Key: QPID-7178
> URL: https://issues.apache.org/jira/browse/QPID-7178
> Project: Qpid
> Issue Type: Bug
> Components: Java Client, Python Client
> Reporter: Paul Loberg
> Attachments: AMQP Sequence.png, AMQP Sequence.txt
>
>
> We seem to have run into a bug where we create a queue with auto-delete=true
> from Python and then send to it using the JMS client. When the JMS
> MessageProducer is closed the queue is removed even if the Python client is
> still consuming from it.
> We first create the queue from Python (qpid-python 0.32, Python 2.7) and send
> a message to another queue "foo-bar" with the newly created auto-delete queue
> as the reply-to address. The connection and session is kept open until a
> response is received.
> A very cut down version of the Python code is below. The client will call
> create_queue, send_request and then await_response and in await_response we
> then (9 out of 10 times) get:
> {noformat}
> File "client.py", line NN, in await_response
> receiver = self._session.receiver(self._queue_name)
> File "<string>", line 6, in receiver
> File "/usr/lib/python2.7/site-packages/qpid/messaging/endpoints.py", line
> 653, in receiver
> receiver.close()
> File "<string>", line 6, in close
> File "/usr/lib/python2.7/site-packages/qpid/messaging/endpoints.py", line
> 1114, in close
> if not self.session._ewait(lambda: self.closed, timeout=timeout):
> File "/usr/lib/python2.7/site-packages/qpid/messaging/endpoints.py", line
> 597, in _ewait
> self.check_error()
> File "/usr/lib/python2.7/site-packages/qpid/messaging/endpoints.py", line
> 586, in check_error
> raise self.error
> qpid.messaging.exceptions.NotFound: not-found: Queue not found:
> 17980224d7004b88b503a71c0c471bfa
> (/var/tmp/portage/net-misc/qpid-cpp-0.34/work/qpid-cpp-0.34/src/qpid/broker/QueueRegistry.cpp:127)(404)
> {noformat}
> {code}
> from qpidtoollibs import BrokerAgent
> ...
> def create_queue(self):
> queue_name = self._queue_name = uuid.uuid4().get_hex()
> agent = BrokerAgent(self._connection)
> declargs = {"auto-delete": "true"}
> agent.addQueue(queue_name, declargs)
> def send_request(self, content_dict):
> sender = self._session.sender(self._foo_queue_name)
> try:
> message = Message(content=json_content, reply_to=self._queue_name)
> sender.send(message)
> finally:
> sender.close()
> def await_response(self, timeout_secs):
> receiver = self._session.receiver(self._queue_name)
> msg = receiver.fetch(timeout=timeout_secs)
> return msg
> {code}
> On the Java side we connect using JMS (0.8.0) and wait for a message to
> arrive in the "foo-bar" queue. Once it does it will create a MessageProducer
> using the reply-to Destination object (from the incoming
> Message.getJMSReplyTo) and send a response back, but when that
> MessageProducer is closed the auto-delete queue seems to be removed even if
> we have the Python client connected to it.
> A very simplified version of the Java code:
> {code:java}
> class BrokerConnection implements MessageListener {
> Connection connection;
> Session session;
> MessageConsumer messageConsumer;
> public BrokerConnection(ConnectionFactory connectionFactory) {
> connection = connectionFactory.createConnection();
> session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
> Destination queue = session.createQueue("foo-bar");
> messageConsumer = session.createConsumer(queue);
> messageConsumer.setMessageListener(this);
> connection.start();
> }
> public void onMessage(Message message) {
> Destination clientQueue = message.getJMSReplyTo();
> try (MessageProducer prod = session.createProducer(clientQueue)) {
> BytesMessage msg = session.createBytesMessage();
> msg.writeBytes(message.unwrap());
> prod.send(msg);
> } // implicit prod.close()
> }
> }
> {code}
> The issue seems to be timing sensitive. It works more often if running on a
> slow machine (i.e. a virtual machine with limited resources) or if a debugger
> is attached to the JVM causing that to slow down.
> From this behavior we suspect a bug in the Java/JMS client code messing with
> the consumer count in the broker.
> Please let us know if we can provide more details to track down this issue.
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