venkata91 commented on a change in pull request #34122:
URL: https://github.com/apache/spark/pull/34122#discussion_r791949482
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File path: core/src/main/scala/org/apache/spark/MapOutputTracker.scala
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@@ -1281,6 +1341,28 @@ private[spark] class MapOutputTrackerWorker(conf:
SparkConf) extends MapOutputTr
}
}
+ override def getShufflePushMergerLocations(shuffleId: Int):
Seq[BlockManagerId] = {
+ shufflePushMergerLocations.getOrElse(shuffleId,
getMergerLocations(shuffleId))
+ }
+
+ private def getMergerLocations(shuffleId: Int): Seq[BlockManagerId] = {
+ val mergers = shufflePushMergerLocations.get(shuffleId).orNull
+ if (mergers == null) {
+ fetchingLock.withLock(shuffleId) {
+ val fetchedMergers =
+
askTracker[Seq[BlockManagerId]](GetShufflePushMergerLocations(shuffleId))
+ if (fetchedMergers.nonEmpty) {
+ shufflePushMergerLocations(shuffleId) = fetchedMergers
+ fetchedMergers
+ } else {
+ Seq.empty[BlockManagerId]
+ }
+ }
+ } else {
Review comment:
Oh. yeah. My bad.
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