How to configure the JGroups threads for JDG server

Issue

• The JGroups threads and properties can be configured in embedded mode with the XML configuration provided by the application. But how configure it in client/server mode there is no attribute or element for the JGroups subsystem schema?
• The cluster communication is affected in a high-load period or if a server goes down or up. We notice a split-brain but did not have a GC or network issue.