felix-thinkingdata opened a new pull request #3695:
URL: https://github.com/apache/incubator-dolphinscheduler/pull/3695


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   ## What is the purpose of the pull request
   
   Improvement #3690
   
   The current policy is to take the first one, but the first test is not 
fixed。This is my debug screenshot.
   当前策略是取第一个,但是第一个测试下来也是不固定的,这个是我调试截图。
   
![image](https://user-images.githubusercontent.com/59079269/92440617-5daf6c00-f1df-11ea-8e45-ea2fd2be25a9.png)
   
![image](https://user-images.githubusercontent.com/59079269/92440630-61db8980-f1df-11ea-8acf-dc2341baee0d.png)
   
   The problem is that on the server, the acquired IP is the external network 
card IP.External network control is more strict, so it is not a full port 
through. Therefore, it is recommended to get IP of Intranet card first.So make 
logical optimizations in your code.
   遇到的问题是服务器上,获取的ip为外网网卡ip.外网控制比较严格,所以不是全端口打通。所以,建议优先获取内网网卡ip。
   所以做出代码中的逻辑优化。


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