code: private void addColumnFamilyAndSetProperties(HTableDescriptor tableDescriptor, String colFamilyName)
      {
          if (!tableDescriptor.hasFamily(colFamilyName.getBytes()))
          {
              HColumnDescriptor hColumnDescriptor = getColumnDescriptor(colFamilyName);
              tableDescriptor.addFamily(hColumnDescriptor);
              setExternalProperties(tableDescriptor.getNameAsString(), hColumnDescriptor);
          }
      }
docs: Adds the column family and set properties.
  
  @param tableDescriptor
  the table descriptor
  @param colFamilyName
  the sec table