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 PROVIDER_SIDE = "provider";
    public static final String CONSUMER_SIDE = "consumer";
    public static final String DEFAULT_REGISTRY = "dubbo";
    public static final String BACKUP_KEY = "backup";
    public static final String DIRECTORY_KEY = "directory";
    public static final String DEPRECATED_KEY = "deprecated";
    public static final String ANYHOST_KEY = "anyhost";
    public static final String ANYHOST_VALUE = "0.0.0.0";
    public static final String LOCALHOST_KEY = "localhost";
    public static final String LOCALHOST_VALUE = "127.0.0.1";
    public static final String APPLICATION_KEY = "application";
    public static final String REMOTE_APPLICATION_KEY = "remote.application";
    public static final String LOCAL_KEY = "local";
    public static final String STUB_KEY = "stub";
    public static final String MOCK_KEY = "mock";
    public static final String PROTOCOL_KEY = "protocol";
    public static final String DUBBO_PROTOCOL = DUBBO;
    public static final String ZOOKEEPER_PROTOCOL = "zookeeper";
    public static final String PROXY_KEY = "proxy";
    public static final String WEIGHT_KEY = "weight";
    public static final String FORKS_KEY = "forks";
    public static final String DEFAULT_THREADPOOL = "limited";
    public static final String DEFAULT_CLIENT_THREADPOOL = "cached";
    public static final String THREADPOOL_KEY = "threadpool";
    public static final String THREAD_NAME_KEY = "threadname";
    public static final String IO_THREADS_KEY = "iothreads";
    public static final String CORE_THREADS_KEY = "corethreads";
    public static final String THREADS_KEY = "threads";
    public static final String QUEUES_KEY = "queues";
    public static final String ALIVE_KEY = "alive";