private Set<InternalDistributedMember> getDefaultDistributionMembers() {
    if (!useAdminMembersForDefault()) {
      return getDistributionManager().getOtherDistributionManagerIds();
    }
    return getDistributionManager().getAllOtherMembers();
  }
Returns a set of the members this advisor should distribute to by default

@since GemFire 5.7
geode-core/src/main/java/org/apache/geode/distributed/internal/DistributionAdvisor.java