can't print DStream after reduce

[Walrus theCat]

Hi,

I have a DStream that works just fine when I say:

dstream.print

If I say:

dstream.map(_,1).print

that works, too.  However, if I do the following:

dstream.reduce{case(x,y) => x}.print

I don't get anything on my console.  What's going on?

Thanks