zhangyz-hd commented on pull request #9002:
URL: https://github.com/apache/dubbo/pull/9002#issuecomment-939309891
再补充下，还是要注意ApplicationModel#onDestroy的处理步骤
是先处理了moduleModel.destroy();
```
for (ModuleModel moduleModel : new ArrayList<>(moduleModels)) {
moduleModel.destroy();
}
```
在这个过程中，因为处理unexportServices，最终就释放了metadataSemaphore，而此时，applicationModel.getDeployer().getState()还是是STARTED
然后再处理deployer.destroy();
```
if (deployer != null) {
deployer.destroy();
deployer = null;
}
```
此时，applicationModel.getDeployer().getState()才会变成STOPPING
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