Hi,

I was wondering whether it is possible to stop streaming data in from one of
the map operators until some data arrives in the second map operator.

For ex, 

if i have ds1.connect(ds2).map(new coflatmapper())

then, i need data to stop flowing from ds1 until some data arrives in ds2. 

Is that possible? I know that's a problematic situation as ds1 may get
overwhelmed with data if not processed quickly, but any work around would
really helpful. 


I was thinking of busy waiting, but I doubt that, the 2 maps work in
different threads.

Regards
Biplob



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