private List<ServerName> getListOfServerNames(final List<ServerAndLoad> sals) {
    return sals.stream().map(ServerAndLoad::getServerName).collect(Collectors.toList());
  }
Test the cluster startup bulk assignment which attempts to retain assignment info.
hbase-balancer/src/test/java/org/apache/hadoop/hbase/master/balancer/TestBaseLoadBalancer.java