Hi, On Fri, Jan 16, 2015 at 7:31 AM, freedafeng <freedaf...@yahoo.com> wrote: > > I myself saw many times that my app threw out exceptions because an empty > RDD cannot be saved. This is not big issue, but annoying. Having a cheap > solution testing if an RDD is empty would be nice if there is no such thing > available now. >
I think the cheapest you can have is computing at least one element in the RDD, which in the case of, say, val maybeEmptyRDD = veryExpensiveRDD.filter(false) will be just as expensive as .count(). Tobias
