Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/11242#discussion_r59010259
--- Diff: core/src/main/scala/org/apache/spark/rdd/UnionRDD.scala ---
@@ -62,8 +62,14 @@ 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 isPartitionEvalParallel: Boolean =
+ rdds.length > conf.getInt("spark.rdd.parallelListingThreshold", 10)
--- End diff --
@davies I think this is best left undocumented. But is this setting
meaningful? This has more purpose than the previous
`spark.rdd.enableParallelListing` config, which only let you disable it. I
actually don't see a case where you wouldn't want parallel listing (see
previous discussion)? why would i want to list 9 serially but 10 all at once?
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