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 CONFIG_NAMESPACE_KEY = "config.namespace";
    public static final String CONFIG_GROUP_KEY = "config.group";
    public static final String CONFIG_CHECK_KEY = "config.check";
    public static final String CONFIG_CONFIGFILE_KEY = "config.config-file";
    public static final String CONFIG_ENABLE_KEY = "config.highest-priority";
    public static final String CONFIG_TIMEOUT_KEY = "config.timeout";
    public static final String CONFIG_APPNAME_KEY = "config.app-name";
    public static final String DEFAULT_CATEGORY = PROVIDERS_CATEGORY;
    public static final String ENABLED_KEY = "enabled";
    public static final String DISABLED_KEY = "disabled";
    public static final String VALIDATION_KEY = "validation";
    public static final String CACHE_KEY = "cache";
    public static final String DYNAMIC_KEY = "dynamic";
    public static final String DUBBO_PROPERTIES_KEY = "dubbo.properties.file";
    public static final String DEFAULT_DUBBO_PROPERTIES = "dubbo.properties";
    public static final String SENT_KEY = "sent";
    public static final boolean DEFAULT_SENT = false;
    public static final String REGISTRY_PROTOCOL = "registry";
    public static final String $INVOKE = "$invoke";
    public static final String $ECHO = "$echo";
    public static final int DEFAULT_IO_THREADS = Math.min(Runtime.getRuntime().availableProcessors() + 1, 32);
    public static final String DEFAULT_PROXY = "javassist";
    /**
     * 8M
     */
    public static final int DEFAULT_PAYLOAD = 8 * 1024 * 1024;
    public static final String DEFAULT_CLUSTER = "failover";
    public static final String DEFAULT_DIRECTORY = "dubbo";
    public static final String DEFAULT_LOADBALANCE = "random";
    public static final String DEFAULT_PROTOCOL = "dubbo";