Github user rxin commented on the pull request:
https://github.com/apache/spark/pull/1689#issuecomment-57043862
BTW one thing that would be great to add is a test that makes sure we don't
block the main dag scheduler thread. The reason I think we don't block is that
we call rdd.partitions.length in submitJob:
```scala
/**
* Submit a job to the job scheduler and get a JobWaiter object back. The
JobWaiter object
* can be used to block until the the job finishes executing or can be
used to cancel the job.
*/
def submitJob[T, U](
rdd: RDD[T],
func: (TaskContext, Iterator[T]) => U,
partitions: Seq[Int],
callSite: CallSite,
allowLocal: Boolean,
resultHandler: (Int, U) => Unit,
properties: Properties = null): JobWaiter[U] =
{
// Check to make sure we are not launching a task on a partition that
does not exist.
val maxPartitions = rdd.partitions.length
```
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