private void printHServerAddressSet(Set<ServerName> serverSet) {
    if (serverSet == null) {
      return;
    }
    int i = 0;
    for (ServerName addr : serverSet) {
      if (i++ % 3 == 0) {
        System.out.print("\n\t\t\t");
      }
      System.out.print(addr.getAddress() + " ; ");
    }
    System.out.println("\n");
  }
Return the number of regions based on the position (primary/secondary/ tertiary) assigned to
their favored nodes
@return the number of regions
hbase-balancer/src/main/java/org/apache/hadoop/hbase/master/AssignmentVerificationReport.java