code: @PublicEvolving
  	public long getLong(ConfigOption<Long> configOption, long overrideDefault) {
  		Object o = getRawValueFromOption(configOption);
  		if (o == null) {
  			return overrideDefault;
  		}
  		return convertToLong(o, configOption.defaultValue());
  	}
docs: Returns the value associated with the given config option as a long integer.
  If no value is mapped under any key of the option, it returns the specified
  default instead of the option's default value.
  
  @param configOption The configuration option
  @param overrideDefault The value to return if no value was mapper for any key of the option
  @return the configured value associated with the given config option, or the overrideDefault