je-ik commented on PR #29793:
URL: https://github.com/apache/beam/pull/29793#issuecomment-2151757415

   There was a significant change in https://github.com/apache/beam/pull/25525 
that affects this. The `ReaderInvocationUtil#invokeCheckpoint` must be used in 
`FlinkUnboundedSourceReader#getReaderCheckpoint` as well. For this 
functionality to be preserved during refactorings, it would be nice to add at 
least a basic test to verify it works (which would prove it will not - at least 
for classic runner - in this case, because of the missing use in 
`FlinkUnboundedSourceReader`. The `UnboudedSourceWrapper`  should be removed as 
drafted in https://github.com/apache/beam/pull/31530.
   
   In the original PR there was a suspicion that this causes [some issues][1], 
is this resolved?
   
    [1]: https://github.com/apache/beam/pull/25554#issuecomment-1460892717


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