Jan Lukavský created BEAM-9888:
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Summary: @RequiresTimeSortedInput might feed data out of order
Key: BEAM-9888
URL: https://issues.apache.org/jira/browse/BEAM-9888
Project: Beam
Issue Type: Improvement
Components: runner-core
Affects Versions: 2.20.0
Reporter: Jan Lukavský
Assignee: Jan Lukavský
Fix For: 2.21.0
StatefulDoFnRunner drops late data based on output watermark, but output
watermark might not advance fast enough to discard data that should have been
dropped. We have to either:
a) drop data based on input watermark, or
b) drop data based on timestamp of last emitted element
I'm a little in favor of b), because it can drop less data.
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