private List<String> asList(Set<String> set) {
        final List<String> list = new ArrayList<>(set);
        list.sort((o1, o2) -> {
            if (o1 != null && o2 != null) {
                return o1.compareTo(o2);
            }
            return 0;
        });
        return list;
    }
Trigger a re-discover if the node saves
stroom-cluster/stroom-cluster-impl/src/main/java/stroom/cluster/impl/ClusterNodeManagerImpl.java