dubbo-cluster/src/main/java/org/apache/dubbo/rpc/cluster/loadbalance/
ConsistentHashLoadBalance.java
![image](https://user-images.githubusercontent.com/30815149/55045041-740f4980-5077-11e9-8b6c-7a2b18b0d58e.png)
我看其他地方都是用Constants进行替换，这里是不是可以使用Constants类里的属性进行替换
public static final String RETRIES_KEY = "retries";
    public static final String FAIL_BACK_TASKS_KEY = "failbacktasks";
    public static final String PROMPT_KEY = "prompt";
    public static final String DEFAULT_PROMPT = "dubbo>";
    public static final String CODEC_KEY = "codec";
    public static final String SERIALIZATION_KEY = "serialization";
    public static final String EXTENSION_KEY = "extension";
    public static final String KEEP_ALIVE_KEY = "keepalive";
    public static final String OPTIMIZER_KEY = "optimizer";
    public static final String EXCHANGER_KEY = "exchanger";
    public static final String DISPACTHER_KEY = "dispacther";
    public static final String TRANSPORTER_KEY = "transporter";
    public static final String SERVER_KEY = "server";
    public static final String CLIENT_KEY = "client";
    public static final String ID_KEY = "id";
    public static final String ASYNC_KEY = "async";
    public static final String FUTURE_GENERATED_KEY = "future_generated";
    public static final String FUTURE_RETURNTYPE_KEY = "future_returntype";
    public static final String ASYNC_SUFFIX = "Async";
    public static final String RETURN_KEY = "return";
    public static final String TOKEN_KEY = "token";
    public static final String METHOD_KEY = "method";
    public static final String METHODS_KEY = "methods";
    public static final String CHARSET_KEY = "charset";
    public static final String RECONNECT_KEY = "reconnect";
    public static final String SEND_RECONNECT_KEY = "send.reconnect";
    public static final int DEFAULT_RECONNECT_PERIOD = 2000;
    public static final String SHUTDOWN_TIMEOUT_KEY = "shutdown.timeout";
    public static final int DEFAULT_SHUTDOWN_TIMEOUT = 1000 * 60 * 15;
    public static final String PID_KEY = "pid";