Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/11242#issuecomment-217245132
By the way, I just tried this out in the REPL and it still blocks behind
user code:
```
import scala.concurrent.ExecutionContext.Implicits.global
import scala.concurrent.Future
Future { (1 to 1000).par.foreach(_ => Thread.sleep(100000000)) }
sc.union((0 to 10).map { _ => sc.parallelize(1 to 1000) }).count() //
blocks forever
```
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