laraschmidt commented on pull request #15275:
URL: https://github.com/apache/beam/pull/15275#issuecomment-1007641545
I'm trying to page this back in. But if I remember correctly, the first
element holds the watermark back until all not-late second elements would have
appeared. So we don't actually need to hold it backwards. It's just the
processElement that puts out older elements.
Here's the relevant code for the timer which are not negative:
if (elementAffectsWatermarkHolds) {
addTimer(watermarkHolds,
ts.plus(thisCollectionValidFor)).withOutputTimestamp(ts);
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