Github user davies commented on a diff in the pull request: https://github.com/apache/spark/pull/3779#discussion_r24067444 --- Diff: core/src/main/scala/org/apache/spark/scheduler/TaskSetManager.scala --- @@ -506,13 +506,63 @@ private[spark] class TaskSetManager( * Get the level we can launch tasks according to delay scheduling, based on current wait time. */ private def getAllowedLocalityLevel(curTime: Long): TaskLocality.TaskLocality = { - while (curTime - lastLaunchTime >= localityWaits(currentLocalityIndex) && - currentLocalityIndex < myLocalityLevels.length - 1) - { - // Jump to the next locality level, and remove our waiting time for the current one since - // we don't want to count it again on the next one - lastLaunchTime += localityWaits(currentLocalityIndex) - currentLocalityIndex += 1 + // Remove the scheduled or finished tasks lazily + def tasksNeedToBeScheduledFrom(pendingTaskIds: ArrayBuffer[Int]): Boolean = { + var indexOffset = pendingTaskIds.size + while (indexOffset > 0) { + indexOffset -= 1 + val index = pendingTaskIds(indexOffset) + if (copiesRunning(index) == 0 && !successful(index)) { + return true + } else { + pendingTaskIds.remove(indexOffset) + } + } + false + } + // Walk through the list of tasks that can be scheduled at each location and returns true + // if there are any tasks that still need to be scheduled. Lazily cleans up tasks that have + // already been scheduled. + def noMoreTasksToRunIn(pendingTasks: HashMap[String, ArrayBuffer[Int]]): Boolean = { + val emptyKeys = new ArrayBuffer[String] + val hasTasks = pendingTasks.exists{ + case (id: String, tasks: ArrayBuffer[Int]) => + if (tasksNeedToBeScheduledFrom(tasks)) { + true + } else { + emptyKeys += id + false + } + } + emptyKeys.foreach(x => pendingTasks.remove(x)) + hasTasks + } + + while (currentLocalityIndex < myLocalityLevels.length - 1) { + val moreTasks = myLocalityLevels(currentLocalityIndex) match { + case TaskLocality.PROCESS_LOCAL => noMoreTasksToRunIn(pendingTasksForExecutor) + case TaskLocality.NODE_LOCAL => noMoreTasksToRunIn(pendingTasksForHost) + case TaskLocality.NO_PREF => pendingTasksWithNoPrefs.nonEmpty --- End diff -- noMoreTasksToRunIn => moreTasksToRunIn()
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