lennonchan opened a new issue, #3818:
URL: https://github.com/apache/servicecomb-java-chassis/issues/3818
ServiceCombServer 类的equals方法在预期类型的情况下，只判断instanceId是否相等。
```
public boolean equals(Object o) {
if (o instanceof ServiceCombServer) {
return this.instance.getInstanceId().equals(((ServiceCombServer)
o).instance.getInstanceId());
} else {
return false;
}
}
```
在一个服务实例有多个类型的监听时，如同时启动rest和highway，切highway故障的情况下，第一次尝试highway通信失败，在尝试使用rest通信时因为两个ServiceCombServer对象equals判断时返回成功，导致不会尝试rest通信。
```
public Server chooseServer(Object key) {
Invocation invocation = (Invocation) key;
boolean isRetry = null != lastServer;
for (int i = 0; i < COUNT; i++) {
Server s = delegate.chooseServer(invocation);
if (s == null) {
break;
}
if (!s.equals(lastServer)) { // lastServer为highway对应的Server,s
为rest对应的场景，因为s.equals(lastServer) == true，导致lb不尝试使用s通信
lastServer = s;
break;
}
}
if (isRetry) {
invocation.getTraceIdLogger().info(LOGGER, "retry to instance [{}]",
lastServer.getHostPort());
}
return lastServer;
}
```
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