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 RUNTIME_KEY = "runtime";
    /**
     * when ROUTER_KEY's value is set to ROUTER_TYPE_CLEAR, RegistryDirectory will clean all current routers
     */
    public static final String ROUTER_TYPE_CLEAR = "clean";
    public static final String DEFAULT_SCRIPT_TYPE_KEY = "javascript";
    public static final String STUB_EVENT_KEY = "dubbo.stub.event";
    public static final boolean DEFAULT_STUB_EVENT = false;
    public static final String STUB_EVENT_METHODS_KEY = "dubbo.stub.event.methods";
    /**
     * When this attribute appears in invocation's attachment, mock invoker will be used
     */
    public static final String INVOCATION_NEED_MOCK = "invocation.need.mock";
    public static final String LOCAL_PROTOCOL = "injvm";
    public static final String AUTO_ATTACH_INVOCATIONID_KEY = "invocationid.autoattach";
    public static final String SCOPE_KEY = "scope";
    public static final String SCOPE_LOCAL = "local";
    public static final String SCOPE_REMOTE = "remote";
    public static final String SCOPE_NONE = "none";
    public static final String RELIABLE_PROTOCOL = "napoli";
    public static final String TPS_LIMIT_RATE_KEY = "tps";
    public static final String TPS_LIMIT_INTERVAL_KEY = "tps.interval";
    public static final long DEFAULT_TPS_LIMIT_INTERVAL = 60 * 1000;
    public static final String DECODE_IN_IO_THREAD_KEY = "decode.in.io";
    public static final boolean DEFAULT_DECODE_IN_IO_THREAD = true;
    public static final String INPUT_KEY = "input";
    public static final String OUTPUT_KEY = "output";
    public static final String EXECUTOR_SERVICE_COMPONENT_KEY = ExecutorService.class.getName();
    public static final String GENERIC_SERIALIZATION_NATIVE_JAVA = "nativejava";
    public static final String GENERIC_SERIALIZATION_DEFAULT = "true";