lostluck commented on issue #29213:
URL: https://github.com/apache/beam/issues/29213#issuecomment-1789810026

   The Go SDK automatically asserts a Splittable DoFn that returns a 
ProcessContinuation to be unbounded. But only SplittableDoFns. 
   
https://beam.apache.org/documentation/programming-guide/#user-initiated-checkpoint
   
   It's unclear if it's a good idea to allow non-splitable DoFns to be able to 
self checkpoint. The SDK would need execution side changes to enable it. But 
from the Beam Portability FnAPI layer, the concepts are tightly related. So at 
best it would be a convenience layer to things under the hood.


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