zrlw commented on issue #9239:
URL: https://github.com/apache/dubbo/issues/9239#issuecomment-964884504
dubbo-samples的dubbo-samples-applevel-override就能稳定重现：
1. CuratorZookeeperClient的344行设置断点
```
} else if (childData.getStat().getVersion() == 0) {
content = new String(childData.getData(), CHARSET);
eventType = EventType.NodeCreated; <== line 344 set
breakpoint here
} else {
```
2. 启动zk服务，端口2181
3. debug启动BasicProvider, 启动参数加dubbo.port=20880
4. debug启动BasicProvider, 启动参数加dubbo.port=20881
5. 在ZKTools的66行设置断点：
```
if (client.checkExists().forPath(path) == null) {
client.create().creatingParentsIfNeeded().withMode(CreateMode.PERSISTENT).forPath(path);
<== line 66 set breakpoint
}
```
6. debug执行DemoServiceIT单元测试
7.
到达ZKTools的66行断点处之后开始单步执行，两个provider中的一个会执行到CuratorZookeeperClient的344行断点，查看content内容就会看到里面只有一个ip地址。
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