ContinuousEventTimeTrigger breaks coGrouped windowed streams?

[William Saar]

Hi! 

        My topology below seems to work when I comment out all the lines with
ContinuousEventTimeTrigger, but prints nothing when the line is in
there. Can I coGroup two large time windows that use a different
trigger time than the window size? (even if the
ContinuousEventTimeTrigger doesn't work for coGroups, I would not
expect the result to be completely silent). 

        The streams I'm cogroupng are from 2 different Kafka sources and uses
event time with 0 out of orderness and I'm on Flink 1.1.3, if that
helps 

        DataStream<CommonType> stream1 =
     <stream of event type1>
     .window(TumblingEventTimeWindows.of(Time.seconds(30)))
     .trigger(ContinuousEventTimeTrigger.of(Time.seconds(10)))
     .fold(...);
      

        DataStream<CommonType> stream2 =
     <stream of event type2>
     .window(TumblingEventTimeWindows.of(Time.seconds(30)))
     .trigger(ContinuousEventTimeTrigger.of(Time.seconds(10)))
     .fold(...); 

             

        stream1.coGroup(stream2).where(...).equalTo(...)
     .window(TumblingEventTimeWindows.of(Time.seconds(30)))
     .trigger(ContinuousEventTimeTrigger.of(Time.seconds(10)))
     .print() 

        Thanks, William