WindyGao commented on issue #5914:
URL: 
https://github.com/apache/incubator-doris/issues/5914#issuecomment-848601559


   
![image](https://user-images.githubusercontent.com/36130371/119632591-88138900-be43-11eb-867e-4a1c3cd02931.png)
   Arthas monitor is used to monitor when ExportJob task is canceled when it 
has timed out:
   `watch org.apache.doris.load.ExportJob cancel  "{params,returnObj}" -x 2`
   
![image](https://user-images.githubusercontent.com/36130371/119632777-b3967380-be43-11eb-8eb6-7ad253ba324a.png)
   
   We can see that the  parameter passed in cancel() when the task was canceled 
is null
   
![image](https://user-images.githubusercontent.com/36130371/119633147-0708c180-be44-11eb-9e4f-2a7b82242a71.png)
   so failMsg is null
   when we use showexport stmt:
   
![image](https://user-images.githubusercontent.com/36130371/119633421-4f27e400-be44-11eb-8593-d69b730e2a80.png)
   Arthas monitor
   watch org.apache.doris.load.ExportJob getFailMsg  "{params,returnObj}" -x 2
   
![image](https://user-images.githubusercontent.com/36130371/119633491-6070f080-be44-11eb-9c66-39bfc6424042.png)
   
   
   
   
   
   


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