nsivabalan commented on pull request #3267:
URL: https://github.com/apache/hudi/pull/3267#issuecomment-880769404


   Also, do you mind fixing the description to be specific as to when exactly 
the issue happens. I feel currently it is very generic. 
   Atleast wrt COW, my understanding is, we don't have any problems. 
   - preCombine() is only used to dedup incoming records among itself. 
   - To combine an incoming along with something on storage, we use 
combineAndGetUpdateValue(). 
   
   Correct me if my understanding is wrong. 


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