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https://issues.apache.org/jira/browse/ARTEMIS-2560?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16985833#comment-16985833
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Mikko Niemi commented on ARTEMIS-2560:
--------------------------------------
Additional tests were done. I added results of the tests to the description of
this issue.
> Duplicate messages created by cluster lead to OOME crash
> --------------------------------------------------------
>
> Key: ARTEMIS-2560
> URL: https://issues.apache.org/jira/browse/ARTEMIS-2560
> Project: ActiveMQ Artemis
> Issue Type: Bug
> Components: AMQP
> Affects Versions: 2.10.1
> Reporter: Mikko Niemi
> Priority: Major
> Attachments: python-qpid-consumer.py, python-qpid-producer.py,
> server0-broker.xml, server1-broker.xml
>
>
> Summary: When using two node cluster with very simple configuration (see
> attached broker.xml files), duplicate messages are generated to queue when
> Python client is used to consume messages one by one from alternating nodes.
> Duplicate messages are generated until OutOfMemoryException crashes the
> broker.
> Detailed description how to produce this problem:
> # Create two node cluster using attached broker.xml files. Node names are
> server0 and server1 for the rest of this description.
> # Produce 100 messages to a queue defined in the address configuration
> inside broker.xml file on node server0. See attached Python producer.
> Produced messages have identical content. Command to produce the messages
> using the attached Python producer: "python python-qpid-producer.py -u
> $username -p $password -H server0 -a exampleQueue -m TestMessageFooBar -A 100"
> # Consume one message from server1 using attached Python consumer. Cluster
> will balance the messages to server1 and total amount of messages is
> decreased by one. After one message is consumed, session and connection are
> closed. Command to consume a message using attached Python consumer: "python
> python-qpid-consumer.py -u $username -p $password -H server1 -a exampleQueue"
> # Consume one message from server0 using attached Python consumer. Cluster
> will balance the messages to server0 and total amount of messages is
> decreased by one. After one message is consumed, session and connection are
> closed. Command to consume a message using attached Python consumer: "python
> python-qpid-consumer.py -u $username -p $password -H server0 -a exampleQueue"
> # Consume one message from server1 using attached Python consumer. Cluster
> will balance the messages to server1 but this time total amount of messages
> is increased radically.
> # If consuming of messages is continued in the manner described above (one
> message from one node and then one message from another node), more messages
> continue to appear into the queue until broker runs out of memory and crashes.
> Technical details considering Python test described above:
> * Apache ActiveMQ Artemis 2.10.1 on RHEL 7.7 64bit
> * OpenJDK 11.0.5
> * Python 3.4.10
> * Apache Qpid Proton 0.29.0 installed via PIP
> In addition to above, following different variations have been tested.
> Problem still occurs with all these variations:
> * Protocol was changed to STOMP.
> * Window-Based Flow Control was turned off.
> **
> [https://activemq.apache.org/components/artemis/documentation/latest/flow-control.html]
> consumerWindowSize
> * Implementation was changed to Java using Apache Qpid JMS library (version
> 0.39.0 for producer, version 0.46.0 for consumer).
> If this is not a bug, I would be very happy for any solution for this
> problem, wheter it is pointing out some mistake in the configuration or in
> the consumer, explaining if this is a designed feature or some other
> explanation.
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