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https://issues.apache.org/jira/browse/ARTEMIS-5780?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18041938#comment-18041938
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Justin Bertram commented on ARTEMIS-5780:
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Correct me if I'm wrong here, but I believe that the setting for {{cleanStart}}
is not relevant here since that only controls what happens when the client
reconnects to an existing session. There only relevant setting here is
{{sessionExpiryInterval}} being set to {{0}} which means the session should end
when the network connection is closed.
> MQTT session queues are not deleted after broker restart when clients
> connected with cleanStart=true and SessionExpiryInterval=0
> --------------------------------------------------------------------------------------------------------------------------------
>
> Key: ARTEMIS-5780
> URL: https://issues.apache.org/jira/browse/ARTEMIS-5780
> Project: Artemis
> Issue Type: Bug
> Components: Broker
> Affects Versions: 2.44.0
> Environment: * OS: Windows Server 2022
> * Artemis: Standalone broker (default {{{}broker.xml{}}}), running as
> Windows Service
> * Java: JDK 17.0.11_9
> * MQTT clients: Eclipse Paho MQTT v5
> ** {{cleanStart = true}}
> ** {{sessionExpiryInterval = 0}}
> ** clientID changes on each start
> ** {{keepAliveInterval = 60}}
> ** Multiple topic subscriptions
> Reporter: Hannes Krennmeir
> Assignee: Justin Bertram
> Priority: Major
>
> h3. *Observed Problem*
> MQTT session queues are correctly deleted when clients disconnect normally or
> even crash while the broker is running. However, in a specific sequence, the
> session queues are {*}not removed{*}, and retained session metadata remains
> present.
> h3. *Steps to Reproduce*
> # Start the broker (Artemis 2.44.0).
> # MQTT clients connect with:
> ** cleanStart=true
> ** sessionExpiryInterval=0
> ** unique clientID per connection
> ** multiple subscriptions
> # While the clients are still connected, {*}stop the broker{*}.
> # After the broker has stopped, {*}terminate the clients{*}.
> # Restart the broker.
> h3. *Expected Behavior*
> * All MQTT subscription queues should be removed, because:
> ** {{cleanStart = true}}
> ** {{sessionExpiryInterval = 0}}
> ** clientID is not reused
> * All session-related messages under {{$sys.mqtt.sessions}} should also be
> removed.
> h3. *Actual Behavior*
> * After restarting Artemis, the MQTT connections and sessions are no longer
> present (expected).
> * But the MQTT subscription queues still exist.
> * Messages stored under the system address {{$sys.mqtt.sessions}} also
> remain.
> Enabling
> {code:xml}
> <auto-delete-queues>true</auto-delete-queues>
> <auto-delete-addresses>true</auto-delete-addresses>{code}
> has no effect, because the session queues have the property {*}Auto created =
> false{*}.
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