Hi Ken, blacklistDF -> just DataFrame Spark is lazy until you call something like collect, take, write it will execute the hold process like you do map or filter before you collect. That mean until you call collect spark do nothing so you df would not have any data -> can’t call foreach. Call collect execute the process -> get data -> foreach is ok.
> On Jul 26, 2016, at 2:30 PM, kevin <kiss.kevin...@gmail.com> wrote: > > blacklistDF.collect()
