Removing PCollection.cache call resulting in two MR jobs writing to same path

[Ben Juhn]

Hello,

I removed a .cache call and am seeing some troublesome behavior.  It results in 
two nodes in Crunch's execution graph writing to the same output path.  When I 
add the .cache call back I end up with one node writing to crunch tmp space, 
and the other node writing to the output path.  

Is this expected behavior?

Thanks,
Ben