Stefan Richter created FLINK-4134:
-------------------------------------
Summary: EventTimeSessionWindows trigger for empty windows when
dropping late events
Key: FLINK-4134
URL: https://issues.apache.org/jira/browse/FLINK-4134
Project: Flink
Issue Type: Bug
Components: DataStream API
Affects Versions: 1.0.3
Reporter: Stefan Richter
It seems like EventTimeSessionWindows sometimes trigger for empty windows. The
behavior is observed in connection with dropping late events:
{code}
stream
.keyBy("sessionKey")
.window(EventTimeSessionWindows.withGap(Time.milliseconds(100)))
.allowedLateness(Time.milliseconds(0))
.apply(new ValidatingWindowFunction())
.print();
{code}
I wrote a generator that generates events for several parallel sessions and
that allows to reproduce the error. For now, I can share this generator
privately for debugging purposes, but my plan is to use the generator as basis
for an integration test.
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