shahidki31 opened a new pull request #23939: [SPARK-27019] [UI]onJobStart 
happens after onExecutionEnd shouldn't overwrite kvstore
URL: https://github.com/apache/spark/pull/23939
 
 
   ## What changes were proposed in this pull request?
   Currently, when the event reordering happens, especially onJobStart event 
come after onExecutionEnd event SQL page in the UI displays weirdly.(for 
eg:test mentioned in JIRA and also this issue randomly occurs when the TPCDS 
query  fails due to broadcast time  etc.)
   
   The reason is that, In the SQLAppstatusListener, we remove the 
liveExecutions entry once the execution ends. So, if a jobStart event come 
after that, then we create a new liveExecution entry corresponding to the 
execId. Eventually this will overwrite the kvstore and UI displays confusing 
entries.
   
   ## How was this patch tested?
   
   Added UT, Also manually tested with the eventLog of the failed query.
   
   Before fix:
   ![screenshot from 2019-03-03 
03-05-52](https://user-images.githubusercontent.com/23054875/53687929-53e2b800-3d61-11e9-9dca-620fa41e605c.png)
   
   After fix:
   ![screenshot from 2019-03-03 
02-40-18](https://user-images.githubusercontent.com/23054875/53687928-4f1e0400-3d61-11e9-86aa-584646ac68f9.png)
   
   
   

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