HAK_IIG created ARTEMIS-5780:
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Summary: 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: HAK_IIG
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 Artemis broker{*}.
# After the broker has stopped, {*}terminate the clients{*}.
# Restart Artemis.
h3. *Actual Behavior*
* After restarting Artemis, the MQTT connections and sessions are no longer
present (expected).
* *But the MQTT session queues created for the subscriptions still exist.*
* Messages stored under the system address *{{$sys.mqtt.sessions}}* also
remain.
* Enabling
<auto-delete-queues>true</auto-delete-queues>
<auto-delete-addresses>true</auto-delete-addresses>
has no effect, because the session queues have the property {*}Auto created =
false{*}.
h3. *Expected Behavior*
* All MQTT session queues created for the subscription should be removed,
because:
** {{cleanStart = true}}
** {{sessionExpiryInterval = 0}}
** clientID is not reused
* All session-related messages under *{{$sys.mqtt.sessions}}* should also be
removed.
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