Github user nchammas commented on the pull request:
https://github.com/apache/spark/pull/2339#issuecomment-55499100
> all() is short-circuit evaluated, so this line of code will only fork one
more process than the number of nodes that have SSH available.
Actually, taking a second look, I may be forking a process per node all the
time due to the list comprehension. I'll look into that.
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