kezhuw commented on pull request #14831:
URL: https://github.com/apache/flink/pull/14831#issuecomment-782788879


   @gaoyunhaii @pnowojski I want to describe an example for necessity of 
`EndOfPartitionEvent` tolerance during checkpoint.
   
   Assumes that operator `C` has two upstream `A` and `B`. During a checkpoint, 
`A` ends with `EndOfPartitionEvent` while `B` keeps running. `C` could receive 
checkpoint barrier from `B` and then `EndOfPartitionEvent` from `A`. In this 
case, FLINK-21081 does not help.


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