mridulm commented on pull request #35146:
URL: https://github.com/apache/spark/pull/35146#issuecomment-1008448763


   Given that `isStale` is used in a few places, it would be better to fix the 
`null` issue there itself.
   Can you try with:
   `return null == appShuffleMergePartitionsInfo || 
appShuffleMergePartitionsInfo.shuffleMergeId > shuffleMergeId;`
   for isStale @pan3793 ?
   
   We also need to ensure we have tests which check for stale but not too late 
as well - this specific codepath is an excellent test case for it.
   
   +CC @otterc, @Ngone51 


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