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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