public boolean serverHasTooFewRegions(int server) {
    int minLoad = this.numRegions / numServers;
    int numRegions = getNumRegions(server);
    return numRegions < minLoad;
  }
Returns true iff a given server has less regions than the balanced amount
hbase-balancer/src/main/java/org/apache/hadoop/hbase/master/balancer/BalancerClusterState.java