[GitHub] [spark] sarutak commented on pull request #33457: [SPARK-36237][UI][SQL] Attach and start handler after application started in UI

Sun, 25 Jul 2021 22:49:24 -0700 


sarutak commented on pull request #33457:
URL: https://github.com/apache/spark/pull/33457#issuecomment-886395725


   @AngersZhuuuu 
   Before this change, the status code `500` is returned and helpful error 
message is shown  if we access to `/jobs` before the UI is prepared.
   
![SPARK-36237-500](https://user-images.githubusercontent.com/4736016/126939072-522f0fbf-cb12-467a-b56c-84cdb42d1ff8.png)
   
   But after this change, the status code `404` is returned and no helpful 
error message is shown.
   
![SPARK-36237-404](https://user-images.githubusercontent.com/4736016/126939133-65927264-348f-4587-847f-563897d95c6f.png)
   
   It might be confusable for users.
   


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