DistributionManager
has a unique {@link
org.apache.geode.distributed.internal.DistributionManager#getId
id} and uses a MembershipManager to discover the other members of the distributed system. It
also uses the MembershipManager to detect when a member has left the group.
While some messages may be broadcast to all
members of the group, the vast majority of messages are only intended
for a subset of the group are sent point-to-point.