Github user fhueske commented on the issue:

    https://github.com/apache/flink/pull/4183
  
    Sorry @wuchong, I started my comment in the morning and got stuck in 
meetings. That's why I didn't see your comment... It's great that we came to 
the same conclusion! :-)
    
    Instead of holding watermarks back at the sources, I would adjust them by 
subtracting the offset. 
    What's your take on the `deferredComputationTime` vs 
`firstResultTimeOffset`?
    
    Thanks, Fabian


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