zhengchenyu commented on PR #57350:
URL: https://github.com/apache/spark/pull/57350#issuecomment-5490563661

   @sunchao I have added restrictions on local mode. For now, two reviews 
remain unresolved:
   
   (1) [P1] Withdraw the UI Service selector before stopping Jetty:
   I tried modifying to delete the UI service before `_ui.foreach(_.stop())`, 
but this makes the code very messy. I don't want to mess up the code for such a 
low-probability and insignificant issue. Therefore, this remains unfixed.
   
   (2) [P2] Clean up external UI Services when the driver exits before 
SparkContext: 
   I think this issue wasn't introduced by this PR; the driver service also has 
this problem. We should create the service after the driver starts to solve the 
issue. However, I don't think this should be addressed in this PR. Moreover, 
the probability of this problem is extremely low.
   
   I don't think it's necessary to fix these two issues for now. What do you 
think? Should we continue?
   


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