[GitHub] [spark] warrenzhu25 opened a new pull request #29082: [SPARK-32288][UI] Add exception summary for failed tasks in stage page

[GitBox]

warrenzhu25 opened a new pull request #29082:
URL: https://github.com/apache/spark/pull/29082


   ### What changes were proposed in this pull request?
   Add exception summary table for failed tasks in stage page.
   
   
![image](https://user-images.githubusercontent.com/1633312/87266076-33f4f580-c479-11ea-97b8-4c7e80d4dfa2.png)
   
![image](https://user-images.githubusercontent.com/1633312/87266114-4bcc7980-c479-11ea-9793-f9e12af645ab.png)
   
   
   ### Why are the changes needed?
   When there're many task failure during one stage, it's hard to find failure 
pattern such as aggregation task failure by exception type and message. If we 
have such information, we can easily know which type of exception of failure is 
the root cause of stage failure.
   
   ### Does this PR introduce _any_ user-facing change?
   Yes
   
   ### How was this patch tested?
   Added UT in UISeleniumSuite
   


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