Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/11242#discussion_r61979292
--- Diff: core/src/main/scala/org/apache/spark/rdd/UnionRDD.scala ---
@@ -56,14 +58,30 @@ private[spark] class UnionPartition[T: ClassTag](
}
}
+object UnionRDD {
--- End diff --
actually, it's best to avoid having a singleton fork join pool here. Just
move it into `getPartitions`. It's unlikely that we'll need to share these
pools across `UnionRDD`s; each RDD probably has enough partitions to saturate
the pool.
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