Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/16250#discussion_r92072568
--- Diff: core/src/main/scala/org/apache/spark/scheduler/DAGScheduler.scala
---
@@ -333,16 +333,16 @@ class DAGScheduler(
// (so we don't unnecessarily re-compute that data).
val serLocs =
mapOutputTracker.getSerializedMapOutputStatuses(shuffleDep.shuffleId)
val locs = MapOutputTracker.deserializeMapStatuses(serLocs)
- (0 until locs.length).foreach { i =>
- if (locs(i) ne null) {
- // locs(i) will be null if missing
- stage.addOutputLoc(i, locs(i))
+ locs.zipWithIndex
--- End diff --
I'd be wary of making this type of change since there are cases where we've
purposely removed Scala-style transformations in hot scheduler loops.
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