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https://issues.apache.org/jira/browse/FLINK-4134?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Stefan Richter reassigned FLINK-4134:
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Assignee: Stefan Richter
> 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
> Assignee: 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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