Github user kl0u commented on the issue:
https://github.com/apache/flink/pull/2350
The way it works is that now the reader gets a ReaderContext and emits its
own watermarks depending on which timeCharacteristic we are operating on. If it
is on IngestionTime, which was the original problem, we emit periodically. In
addition, in this case, it assigns timestamps to the emitted elements.
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