Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/9175#discussion_r42568232
--- Diff: core/src/main/scala/org/apache/spark/scheduler/DAGScheduler.scala
---
@@ -353,10 +353,15 @@ class DAGScheduler(
if (mapOutputTracker.containsShuffle(shuffleDep.shuffleId)) {
val serLocs =
mapOutputTracker.getSerializedMapOutputStatuses(shuffleDep.shuffleId)
val locs = MapOutputTracker.deserializeMapStatuses(serLocs)
- for (i <- 0 until locs.length) {
- stage.outputLocs(i) = Option(locs(i)).toList // locs(i) will be
null if missing
+ var numAvailableOutputs = 0
+ var i = 0
+ while (i < locs.length) {
+ if (locs(i) ne null) {
--- End diff --
This is doing reference check, which is different from != that invokes the
equals method?
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