You can confirm the operation of message queue polling while in DEBUG mode.

On nodes where the value of
mq.data.change.monitor.thread.start
is
false
, the message
Monitoring is disabled
appears in the logs.
On nodes where the value of
mq.data.change.monitor.thread.start
is
true
, the message
Data changes monitoring started
appears in the logs.

By default, message queue polling is enabled on all Java virtual machines where an MDM Hub EAR file is deployed. When you use multiple poller threads for data change monitoring and for publishing messages, the messages might not publish in the correct sequence. To control the sequence in which the messages are published, use a single poller thread.