Hi!

While working with grouping and windowing I encountered a strange behavior. I'm 
doing:
> dataStream.groupBy(KeySelector).window(Time.of(x, 
> TimeUnit.SECONDS)).mapWindow(toString).flatten()

When I run the program containing this snippet it initially outputs data at a 
rate around 150 events per sec. (That is roughly the input rate for the 
program). After about 10-30 minutes the rate drops down below 5 events per sec. 
This leads to event delivery offsets getting bigger and bigger ... 

Any explanation for this? I know you are reworking the streaming API. But it 
would be useful to know, why this happens ...

Cheers. Rico. 

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