leimbag commented on issue #9623:
URL: https://github.com/apache/dubbo/issues/9623#issuecomment-1021984715
nacos-client-2.0.3的
com.alibaba.nacos.client.naming.core.ServiceInfoUpdateService内部的UpdateTask的run方法，当serviceObj.getLastRefTime()
<=
lastRefTime会去查询服务对象，此时返回的服务对象的host为0，进而publish的event内部的host列表也是0，最后在consumer上更新实例会因为是空host产生空的instance，consumer端会无法正常下线生产者服务
```
if (serviceObj.getLastRefTime() <= lastRefTime) {
serviceObj =
namingClientProxy.queryInstancesOfService(serviceName, groupName, clusters, 0,
false); <== 此处返回空host列表的服务对象
serviceInfoHolder.processServiceInfo(serviceObj);
}
```
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