Github user squito commented on a diff in the pull request:
https://github.com/apache/spark/pull/5964#discussion_r30862083
--- Diff:
core/src/main/scala/org/apache/spark/scheduler/TaskSchedulerImpl.scala ---
@@ -159,6 +159,12 @@ private[spark] class TaskSchedulerImpl(
this.synchronized {
val manager = createTaskSetManager(taskSet, maxTaskFailures)
activeTaskSets(taskSet.id) = manager
+ val taskSetsPerStage =
activeTaskSets.values.filterNot(_.isZombie).groupBy(_.stageId)
+ taskSetsPerStage.foreach { case (stage, taskSets) =>
+ if (taskSets.size > 1) {
+ throw new SparkIllegalStateException("more than one active
taskSet for stage " + stage)
+ }
+ }
--- End diff --
this is defensive. Hopefully this PR will eliminate multiple concurrent
attempts for the same stage, but I'd like to add this check in any case.
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