Github user piaozhexiu commented on a diff in the pull request: https://github.com/apache/spark/pull/8512#discussion_r44240260 --- Diff: core/src/main/scala/org/apache/spark/rdd/UnionRDD.scala --- @@ -62,7 +66,23 @@ class UnionRDD[T: ClassTag]( var rdds: Seq[RDD[T]]) extends RDD[T](sc, Nil) { // Nil since we implement getDependencies + // Evaluate partitions in parallel. Partitions of each rdd will be cached by the `partitions` + // val in `RDD`. + private lazy val evaluatePartitions: Unit = { + val threshold = conf.getInt("spark.rdd.parallelListingThreshold", 10) + Preconditions.checkArgument(threshold > 0, + "spark.rdd.parallelListingThreshold must be positive: %s", threshold.toString) --- End diff -- Fixed.
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