Github user shivaram commented on a diff in the pull request:
https://github.com/apache/spark/pull/16250#discussion_r92062052
--- 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 --
Its hard to profile these things closely enough to figure out how much
overhead it adds (depends on locs.length of course etc.). My vote would be to
be conservative and keep the existing version
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