leimbag commented on issue #9623:
URL: https://github.com/apache/dubbo/issues/9623#issuecomment-1021001386
重新启动生产者（dubbo-user-service）后，对应的web-demo循环多次client为HeaderExchangeClient后，执行最后一次client为org.apache.dubbo.rpc.protocol.dubbo.ReferenceCountExchangeClient，对应的调用栈信息如下：
```
destroyInternal:171, DubboInvoker (org.apache.dubbo.rpc.protocol.dubbo)
destroy:141, DubboInvoker (org.apache.dubbo.rpc.protocol.dubbo)
destroy:89, ListenerInvokerWrapper (org.apache.dubbo.rpc.listener)
destroyAll:50, Invoker (org.apache.dubbo.rpc)
destroyUnusedInvokers:512, RegistryDirectory
(org.apache.dubbo.registry.integration)
refreshInvoker:260, RegistryDirectory (org.apache.dubbo.registry.integration)
refreshOverrideAndInvoker:184, RegistryDirectory
(org.apache.dubbo.registry.integration)
notify:162, RegistryDirectory (org.apache.dubbo.registry.integration)
notify:440, AbstractRegistry (org.apache.dubbo.registry.support)
doNotify:371, FailbackRegistry (org.apache.dubbo.registry.support)
notify:363, FailbackRegistry (org.apache.dubbo.registry.support)
notifySubscriber:556, NacosRegistry (org.apache.dubbo.registry.nacos)
access$100:88, NacosRegistry (org.apache.dubbo.registry.nacos)
doNotify:656, NacosRegistry$RegistryChildListenerImpl$1
(org.apache.dubbo.registry.nacos)
run:100, RegistryNotifier$NotificationTask (org.apache.dubbo.registry)
call:514, Executors$RunnableAdapter (java.util.concurrent)
run$$$capture:264, FutureTask (java.util.concurrent)
run:-1, FutureTask (java.util.concurrent)
- Async stack trace
<init>:151, FutureTask (java.util.concurrent)
<init>:215, ScheduledThreadPoolExecutor$ScheduledFutureTask
(java.util.concurrent)
schedule:561, ScheduledThreadPoolExecutor (java.util.concurrent)
submit:715, ScheduledThreadPoolExecutor (java.util.concurrent)
submit:694, Executors$DelegatedExecutorService (java.util.concurrent)
notify:77, RegistryNotifier (org.apache.dubbo.registry)
onEvent:665, NacosRegistry$RegistryChildListenerImpl
(org.apache.dubbo.registry.nacos)
onEvent:124, InstancesChangeNotifier (com.alibaba.nacos.client.naming.event)
onEvent:40, InstancesChangeNotifier (com.alibaba.nacos.client.naming.event)
lambda$notifySubscriber$0:201, DefaultPublisher
(com.alibaba.nacos.common.notify)
notifySubscriber:208, DefaultPublisher (com.alibaba.nacos.common.notify)
receiveEvent:192, DefaultPublisher (com.alibaba.nacos.common.notify)
openEventHandler:118, DefaultPublisher (com.alibaba.nacos.common.notify)
run:95, DefaultPublisher (com.alibaba.nacos.common.notify)
```
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