pabloem opened a new pull request #11296:
URL: https://github.com/apache/beam/pull/11296
r: @robertwb
This change adds an initial 'sketch' of watermark tracking to the batch
runner. Watermark tracking is done like so:
1. If a PCollection has a delayed application, its watermark will be held at
`MIN_WATERMARK`.
2. If a PTransform has a channel split, its input PCollection's watermark
will be held at `MIN_WATERMARK`
3. For timers, an 'input pcollection' node is created for each timer family
to be consumed by a transform. If a bundle execution returns a timer set at
time X, the input PCollection for that timer family will be held at X. This
will hold back the downstream watermarks from the stage.
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