Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/11242#discussion_r62225084
--- Diff: core/src/main/scala/org/apache/spark/rdd/UnionRDD.scala ---
@@ -62,8 +64,21 @@ class UnionRDD[T: ClassTag](
var rdds: Seq[RDD[T]])
extends RDD[T](sc, Nil) { // Nil since we implement getDependencies
+ // visible for testing
+ private[spark] val isPartitionListingParallel: Boolean =
+ rdds.length > conf.getInt("spark.rdd.parallelListingThreshold", 10)
+
+ private lazy val partitionEvalTaskSupport = new ForkJoinTaskSupport(new
ForkJoinPool(8))
--- End diff --
This needs to be transient
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