reuvenlax commented on issue #11154: [BEAM-1819] Key should be available in 
@OnTimer methods
URL: https://github.com/apache/beam/pull/11154#issuecomment-609100632
 
 
   @steveniemitz in principle, removing a state cell is absolutely a 
backwards-incompatible change, just like removing a GroupByKey is (for the 
latter, the Dataflow requires the user to explicitly allow the deletion on 
update). There are multiple things that can go wrong if a state cell is removed 
accidentally. In practice, I'm not 100% sure if Dataflow or any other runner 
currently validates compatibility at the state cell level or not.

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