Github user wzhfy commented on a diff in the pull request:
https://github.com/apache/spark/pull/16677#discussion_r115642967
--- Diff: core/src/main/scala/org/apache/spark/MapOutputTracker.scala ---
@@ -156,12 +156,14 @@ private[spark] abstract class MapOutputTracker(conf:
SparkConf) extends Logging
// Synchronize on the returned array because, on the driver, it gets
mutated in place
statuses.synchronized {
val totalSizes = new Array[Long](dep.partitioner.numPartitions)
- for (s <- statuses) {
+ val numberOfOutput = new Array[Long](statuses.length)
+ statuses.zipWithIndex.map { case (s, index) =>
--- End diff --
map -> foreach
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