je-ik commented on pull request #13592:
URL: https://github.com/apache/beam/pull/13592#issuecomment-749754986


   > Hm, maybe Dataflow is not using SplittableDoFnViaKeyedWorkItems and has 
some specific implementation?
   
   Ah, got that. Dataflow uses cache for state access. So writing to state and 
reading it back can return the same identical object. But that is runner 
specific. Flink always serializes access to state.


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