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Posted to notifications@dubbo.apache.org by GitBox <gi...@apache.org> on 2022/11/07 11:44:50 UTC
[GitHub] [dubbo] hai-go opened a new issue, #10889: dubbo 选中随机端口时 ServerSocket ignored = new ServerSocket(i) 无法关闭
hai-go opened a new issue, #10889:
URL: https://github.com/apache/dubbo/issues/10889
### 问题
无论我怎么重启服务，甚至重启电脑也无法解决。dubbo 提示：Address already in use 问题。
最后debug 一层一层网上找。最后经过测试发现 ServerSocket ignored = new ServerSocket(i); 会存在ignored.close(); 关闭失败问题。
### 现象
当我运行至portToBind = NetUtils.getAvailablePort(defaultPort); 时 sudo lsof -i tcp:20882 显示没有监听此端口。
当执行至ServerSocket ignored = new ServerSocket(i); 执行sudo lsof -i tcp:20882 显示端口已被监听，当执行ignored.close(); 成功执行未报错。 再次查看端口时，还是显示被监听。最后就提示端口已经被使用。
貌似 20880和20881 一般会启动成功。
### 截图
<img width="741" alt="image" src="https://user-images.githubusercontent.com/42711480/200301868-90b6bf79-704e-4ebb-a496-0be210b7f85d.png">
<img width="1022" alt="image" src="https://user-images.githubusercontent.com/42711480/200301980-f5b8d2e3-d42d-46e3-8f44-7bd6d5589a92.png">
<img width="992" alt="image" src="https://user-images.githubusercontent.com/42711480/200302201-a3af410c-8488-4e79-a9d4-fb0ceb87bb69.png">
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[GitHub] [dubbo] AlbumenJ commented on issue #10889: dubbo 选中随机端口时 ServerSocket ignored = new ServerSocket(i) 无法关闭
Posted by GitBox <gi...@apache.org>.
AlbumenJ commented on issue #10889:
URL: https://github.com/apache/dubbo/issues/10889#issuecomment-1306396638
```java
public static synchronized int getAvailablePort(int port) {
if (port < MIN_PORT) {
return MIN_PORT;
}
for (int i = port; i < MAX_PORT; i++) {
if (USED_PORT.get(i)) {
continue;
}
try (ServerSocket ignored = new ServerSocket(i)) {
USED_PORT.set(i);
port = i;
break;
} catch (IOException e) {
// continue
}
}
return port;
}
```
这段代码逻辑你自己写个 demo 跑一下看看 IOException 是不是有东西，可能是环境配置的问题
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[GitHub] [dubbo] hai-go commented on issue #10889: dubbo 选中随机端口时 ServerSocket ignored = new ServerSocket(i) 无法关闭
Posted by GitBox <gi...@apache.org>.
hai-go commented on issue #10889:
URL: https://github.com/apache/dubbo/issues/10889#issuecomment-1306485127
这个demo 运行是没问题，除了已经绑定了的端口会提示地址已使用外，其他的都不会出异常，并且当离开try区时，ServerSocket将自动关闭，lsof 将看不到LISTEN。就很神奇。然后再去运行原来的工程就还是原来的样子。我尝试找一下环境配置的问题看看。
谢谢。如果有其他可能性请告知我。
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[GitHub] [dubbo] chickenlj closed issue #10889: dubbo 选中随机端口时 ServerSocket ignored = new ServerSocket(i) 无法关闭
Posted by GitBox <gi...@apache.org>.
chickenlj closed issue #10889: dubbo 选中随机端口时 ServerSocket ignored = new ServerSocket(i) 无法关闭
URL: https://github.com/apache/dubbo/issues/10889
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