Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/5164#discussion_r27013801
--- Diff:
core/src/main/scala/org/apache/spark/rdd/ZippedPartitionsRDD.scala ---
@@ -60,7 +60,7 @@ private[spark] abstract class ZippedPartitionsBaseRDD[V:
ClassTag](
val prefs = rdds.map(rdd =>
rdd.preferredLocations(rdd.partitions(i)))
// Check whether there are any hosts that match all RDDs; otherwise
return the union
val exactMatchLocations = prefs.reduce((x, y) => x.intersect(y))
- val locs = if (!exactMatchLocations.isEmpty) exactMatchLocations
else prefs.flatten.distinct
+ val locs = if (exactMatchLocations.nonEmpty) exactMatchLocations
else prefs.flatten.distinct
--- End diff --
This change actually breaks the logic
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