venkata91 commented on a change in pull request #33896:
URL: https://github.com/apache/spark/pull/33896#discussion_r748574875
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File path: core/src/main/scala/org/apache/spark/scheduler/DAGScheduler.scala
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@@ -1716,7 +1739,31 @@ private[spark] class DAGScheduler(
if (runningStages.contains(shuffleStage) &&
shuffleStage.pendingPartitions.isEmpty) {
if (!shuffleStage.shuffleDep.shuffleMergeFinalized &&
shuffleStage.shuffleDep.getMergerLocs.nonEmpty) {
- scheduleShuffleMergeFinalize(shuffleStage)
+ // Check if a finalize task has already been scheduled. This
is to prevent the
+ // following scenario: Stage A attempt 0 fails and gets
retried. Stage A attempt 1
+ // succeeded, triggering the scheduling of shuffle merge
finalization. However,
+ // tasks from Stage A attempt 0 might still be running and
sending task completion
+ // events to DAGScheduler. This check prevents multiple
attempts to schedule merge
+ // finalization get triggered due to this.
Review comment:
@Ngone51 Do you mean we can have a `finalize` flag corresponding to the
`ScheduledTask` and then set it to `false` when we are about to cancel and
schedule a new one. In the `finalizeShuffleMerge`, we basically check if this
`finalize` flag is true or false and accordingly complete the shuffle merge
finalization instead going the route of canceling the task.
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