[GitHub] [doris] freemandealer opened a new issue, #16300: [Enhancement] better error msg for follower fe

[via GitHub]

freemandealer opened a new issue, #16300:
URL: https://github.com/apache/doris/issues/16300

   ### Search before asking
   
   - [X] I had searched in the 
[issues](https://github.com/apache/doris/issues?q=is%3Aissue) and found no 
similar issues.
   
   
   ### Description
   
   发往 fellower fe 的请求转发给 master fe 后，如果超时，那么返回客户端的报错信息 和 fe 的日志都会很奇怪，需要改进。
   
   返回用户的报错：
   
![image](https://user-images.githubusercontent.com/6492193/215773143-aaaea5cc-fa8b-48fc-80d4-81c517108284.png)
   
   
   follower fe 日志：
   
![image](https://user-images.githubusercontent.com/6492193/215773276-b237a594-fd52-4b5b-b869-f39986bb1184.png)
   
   
   预期：
   无论 client 连接的是 follower fe 上还是 master fe ，都应该返回真正的错误原因，比如“ backend RPC 
timeout“
   
   ### Solution
   
   _No response_
   
   ### Are you willing to submit PR?
   
   - [ ] Yes I am willing to submit a PR!
   
   ### Code of Conduct
   
   - [X] I agree to follow this project's [Code of 
Conduct](https://www.apache.org/foundation/policies/conduct)
   


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