public byte getByte(String key, byte defaultValue) {
        addToDefaults(key, Byte.toString(defaultValue));
        String value = get(key);
        if (value == null) {
            return defaultValue;
        } else {
            return Byte.valueOf(value);
        }
    }
Returns the Byte value for the given key. If the key does not exists it will return the
default value given. The method fails if the value is not a Byte.
inlong-sort/sort-common/src/main/java/org/apache/inlong/sort/util/ParameterTool.java