Fabian Hueske created FLINK-7388:
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Summary: ProcessFunction.onTimer() sets processing time as
timestamp
Key: FLINK-7388
URL: https://issues.apache.org/jira/browse/FLINK-7388
Project: Flink
Issue Type: Improvement
Components: DataStream API
Affects Versions: 1.3.2, 1.4.0
Reporter: Fabian Hueske
The {{ProcessFunction.onTimer()}} method sets the current processing time as
event-time timestamp when it is called from a processing time timer.
I don't think this behavior is useful. Processing time timestamps won't be
aligned with watermarks and are not deterministic. The only reason would be to
have _some_ value in the timestamp field. However, the behavior is very subtle
and might not be noticed by users.
IMO, it would be better to erase the timestamp. This will cause downstream
operator that rely on timestamps to fail and notify the users that the logic
they implemented was probably not what they intended to do.
What do you think [~aljoscha]?
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