The JGroups subsystem needs optimal defaults out of the box, that are also good for derived products (e.g. JDG), both for protocols and thread pools.

Use a bounded thread pool for the default executor
core-size==number of members (32 for JDG)
max-threads = 1.5*core-size

oob should be queueless

AS7 protocol list (UDP): PING, MERGE2, FD_SOCK, FD, VERIFY_SUSPECT, BARRIER, pbcast.NAKACK, UNICAST2, pbcast.STABLE, pbcast.GMS, UFC, MFC, FRAG2, RSVP
JDG protocol list (UDP): PING, MERGE2, FD_SOCK, FD_ALL, pbcast.NAKACK, UNICAST2, pbcast.STABLE, pbcast.GMS, UFC, MFC, FRAG2, RSVP

AS7 protocol list (TCP): MPING, MERGE2, FD_SOCK, FD, VERIFY_SUSPECT, BARRIER, pbcast.NAKACK, UNICAST2, pbcast.STABLE, pbcast.GMS, UFC, MFC, FRAG2, RSVP
JDG protocol list (TCP): MPING, MERGE2, FD_SOCK, FD, VERIFY_SUSPECT, pbcast.NAKACK, UNICAST2, pbcast.STABLE, pbcast.GMS, UFC, MFC, FRAG2, RSVP