yelianevich commented on issue #31085:
URL: https://github.com/apache/beam/issues/31085#issuecomment-2115414913

   What I ment is that only when all subtasks of the source emit a record (see 
'Records sent' in the image below) then I can see watermark on the next 
operator in the UI. Each side input is independent in this respect.
   <img width="760" alt="image" 
src="https://github.com/apache/beam/assets/8944946/164fd868-95e6-46b4-b577-78f353a8dfb5";>
   
   Below you can see an example of the source that do not emit a watermark
   <img width="647" alt="image" 
src="https://github.com/apache/beam/assets/8944946/c1530999-7770-4719-ab30-78ba7c9ec466";>
   
   
   


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