nbali opened a new pull request #16909:
URL: https://github.com/apache/beam/pull/16909


   **Please** add a meaningful description for your change here
   https://github.com/apache/beam/pull/15951 was the original trigger. During 
my tests the issue that I have encountered was that the graph and the behaviour 
during the actual execution differed from the one I would have expected 
strictly based on the `KafkaIO` configurations in the code. It happened due to 
multiple reasons, but this PR only aims to address one - for the rest see 
https://github.com/apache/beam/pull/16773 and 
https://github.com/apache/beam/pull/16888
   
   So the current issue is that not every configration/property available at at 
the `KafkaIO.Read` works both with the legacy and the SDF implementation. On 
it's own this wouldn't be a problem, but unfortunately not every property was 
checked for this so you could configure it thinking it will work, but it won't 
and to make things ever worse without providing you any notice/warning about 
it. Also in certain scenarios the internal `PTransform` overrides replaced a 
working solution with another one that could result in lost functionality, 
because the new one might not support a feature - and to make this even worse 
this codepath could completely avoid any check in that regard.
   
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