Github user rdblue commented on a diff in the pull request:
https://github.com/apache/spark/pull/11242#discussion_r62215656
--- Diff: core/src/main/scala/org/apache/spark/rdd/UnionRDD.scala ---
@@ -56,14 +58,30 @@ private[spark] class UnionPartition[T: ClassTag](
}
}
+object UnionRDD {
+ private lazy val partitionEvalThreadPool = new ForkJoinPool(8)
+}
+
@DeveloperApi
class UnionRDD[T: ClassTag](
sc: SparkContext,
var rdds: Seq[RDD[T]])
extends RDD[T](sc, Nil) { // Nil since we implement getDependencies
+ // visible for testing
+ private[spark] val isPartitionEvalParallel: Boolean =
--- End diff --
I updated this to `shouldListPartitionsInParallel`. Starting with "read"
makes it sound like it should do a read action. And using "list" matches the
config property.
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