public int getIntInRange(String name, int start, int end) {
    if (!containsKey(name)) {
      throw new IllegalArgumentException("Missing required property '" + name + "'");
    }
    return getIntInRange(name, -1, start, end);
  }
Read a required integer property value or throw an exception if no such property is found
ambry-api/src/main/java/com/github/ambry/config/VerifiableProperties.java