Github user willb commented on the pull request:
https://github.com/apache/spark/pull/143#issuecomment-37854483
Right now, the cases where preemptive checking isn't happening are in
`DStream.transform` and `DStream.transformWith` invocations, since a DStream
object is accessible from the closure argument to these in but one invocation
in the test suite. (I've been trying to figure out why preemptive checking
fails here but why these aren't failing on actions.)
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