viirya commented on a change in pull request #30392:
URL: https://github.com/apache/spark/pull/30392#discussion_r524906076
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File path: core/src/main/scala/org/apache/spark/rdd/RDD.scala
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@@ -1521,7 +1521,7 @@ abstract class RDD[T: ClassTag](
if (mapRDDs.partitions.length == 0) {
Array.empty
} else {
- mapRDDs.reduce { (queue1, queue2) =>
+ mapRDDs.treeReduce { (queue1, queue2) =>
Review comment:
I'm not sure if I miss anything, but this looks makes more sense based
on the reason in the PR description.
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