Peter Gyori created NIFI-9410:
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Summary: ConsumeMQTT does not work in stateless flows
Key: NIFI-9410
URL: https://issues.apache.org/jira/browse/NIFI-9410
Project: Apache NiFi
Issue Type: Bug
Components: Extensions
Reporter: Peter Gyori
Assignee: Peter Gyori
When ConsumeMQTT is executed in stateless environment, the {{transferQueue()}}
method gets into an endless loop ({{{}while (!mqttQueue.isEmpty()){}}}). At the
end of each iteration of this loop
{code:java}
session.commitAsync(() -> mqttQueue.remove(mqttMessage));{code}
is supposed to remove the message from the queue. but since the commit is
async, the method is already processing the same message in the next iteration
by the time it would execute. The session cannot commit so it does a rollback,
and the message is never removed from the queue.
The endless loop consumes all resources and NiFi needs to be restarted to break
the loop.
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