This KB Article: https://comm.support.ca.com/kb/how-to-configure-a-multinode-ump-cluster-to-use-unicast-instead-of-multicast/kb000035329
-> was created by L2 Support as a potential workaround in environments where it is advantageous to to set up a clustered/multi-node UMP installation without using multicast.
This is neither officially tested or supported in UIM nor is it officially documented. It was created to help a customer to get it working within their specific environment. In general, any/all custom changes made to the Liferay portal-ext.properties
file will NOT be retained. Liferay is the underlying platform for the UMP portal.
That said, if you find a situation where upon upgrade, after you deploy one or more UIM packages to the UMP robot(s), it then overwrites a given setting within UIM/UMP, e.g., wasp.cfg,that doesn't apply to this workaround, you can open a case with Support.