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 EXECUTES_KEY = "executes";
    public static final String BUFFER_KEY = "buffer";
    public static final String PAYLOAD_KEY = "payload";
    public static final String REFERENCE_FILTER_KEY = "reference.filter";
    public static final String INVOKER_LISTENER_KEY = "invoker.listener";
    public static final String SERVICE_FILTER_KEY = "service.filter";
    public static final String EXPORTER_LISTENER_KEY = "exporter.listener";
    public static final String ACCESS_LOG_KEY = "accesslog";
    public static final String ACTIVES_KEY = "actives";
    public static final String CONNECTIONS_KEY = "connections";
    public static final String ACCEPTS_KEY = "accepts";
    public static final String IDLE_TIMEOUT_KEY = "idle.timeout";
    public static final String HEARTBEAT_KEY = "heartbeat";
    /**
     * Every heartbeat duration / HEATBEAT_CHECK_TICK, check if a heartbeat should be sent. Every heartbeat timeout
     * duration / HEATBEAT_CHECK_TICK, check if a connection should be closed on server side, and if reconnect on
     * client side
     */
    public static final int HEARTBEAT_CHECK_TICK = 3;
    /**
     * the least heartbeat during is 1000 ms.
     */
    public static final long LEAST_HEARTBEAT_DURATION = 1000;
    /**
     * ticks per wheel.
     */
    public static final int TICKS_PER_WHEEL = 128;
    public static final String HEARTBEAT_TIMEOUT_KEY = "heartbeat.timeout";
    public static final String CONNECT_TIMEOUT_KEY = "connect.timeout";
    public static final String TIMEOUT_KEY = "timeout";