每次应用重启，都会在 /dubbo/metadata/${appName} 下生成一个版本号。经过调试，发现在每次计算 revison， 会连同  pid 和 timestamp 一起计算。这样是不是有问题呢？

![image](https://user-images.githubusercontent.com/24663965/125059185-a1178700-e0dd-11eb-8271-0243d59d30b6.png)

public String getParameter(String key) {
            if (consumerParams != null) {
                String value = consumerParams.get(key);
                if (value != null) {
                    return value;
                }
            }
            return params.get(key);
        }
        public String getMethodParameter(String method, String key, String defaultValue) {
            if (methodParams == null) {
                methodParams = URLParam.initMethodParameters(params);
                consumerMethodParams = URLParam.initMethodParameters(consumerParams);
            }
            String value = getMethodParameter(method, key, consumerMethodParams);
            if (value != null) {
                return value;
            }
            value = getMethodParameter(method, key, methodParams);
            return value == null ? defaultValue : value;
        }
        private String getMethodParameter(String method, String key, Map<String, Map<String, String>> map) {
            String value = null;
            if (map != null) {
                Map<String, String> keyMap = map.get(method);
                if (keyMap != null) {
                    value = keyMap.get(key);
                }
            }
            return value;