boyuanzz edited a comment on pull request #14013:
URL: https://github.com/apache/beam/pull/14013#issuecomment-781726100


   Hi Jan,
   
   You are right that that UnboundedSourceAsSDFWrapperDoFn doesn't update 
watermark correctly while tryClaim() is called. I think we should fix 
UnboundedSourceAsSDFWrapperDoFn instead of 
EmptyUnboundedSource.EmptyUnboundedReader. Here is my one line fix which does 
the same thing as yours: https://github.com/apache/beam/pull/14020. I really 
like your test so would you like to consider patching my fix into your PR if my 
fix makes sense to you?


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