[jira] [Created] (FLINK-4134) EventTimeSessionWindows trigger for empty windows when dropping late events

["Stefan Richter (JIRA)" <ji...@apache.org>]

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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