Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/11628#discussion_r55637430
--- Diff: core/src/main/scala/org/apache/spark/rdd/PipedRDD.scala ---
@@ -118,6 +118,7 @@ private[spark] class PipedRDD[T: ClassTag](
val proc = pb.start()
val env = SparkEnv.get
+ @volatile var exception: Option[Throwable] = None
--- End diff --
Let's use an AtomicReference here, and we can also get rid of the Option
(just use null since it is localized scope)
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