egalpin commented on issue #21690:
URL: https://github.com/apache/beam/issues/21690#issuecomment-1155289750

   @kennknowles Sorry my comment may have been unclear.  I don't know the 
approach to fix this issue yet, rather I believe this issue was introduced by 
https://github.com/apache/beam/pull/17112.  I could actually use some guidance 
by anyone with in depth knowledge of windowing.
   
   So far I'm working with the assumption that applying global windowing[1] to 
an input with non-global windowing results in a PCollection with mismatched 
WindowCoder[2]? I'm not able to reproduce this issue with a test yet, including 
a test that applies FixedWindows before running the `Write` transform.  
   
   [1] 
https://github.com/apache/beam/pull/17112/files#diff-e119923661d41dfc1911da8f6e29cc0e2e9a0a50129718c1c20c7d1aa32119bfR2275
   [2] 
https://github.com/apache/beam/blob/master/sdks/java/core/src/main/java/org/apache/beam/sdk/util/WindowedValue.java#L571-L575
 


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