Github user maropu commented on a diff in the pull request: https://github.com/apache/spark/pull/12060#discussion_r58169664 --- Diff: core/src/main/scala/org/apache/spark/scheduler/DAGScheduler.scala --- @@ -750,23 +764,20 @@ class DAGScheduler( submitStage(stage) } } - submitWaitingStages() } /** * Check for waiting stages which are now eligible for resubmission. - * Ordinarily run on every iteration of the event loop. + * Ordinarily run after the parent stage completed successfully. */ - private def submitWaitingStages() { - // TODO: We might want to run this less often, when we are sure that something has become - // runnable that wasn't before. + private def submitWaitingChildStages(parent: Stage) { logTrace("Checking for newly runnable parent stages") logTrace("running: " + runningStages) logTrace("waiting: " + waitingStages) logTrace("failed: " + failedStages) - val waitingStagesCopy = waitingStages.toArray - waitingStages.clear() - for (stage <- waitingStagesCopy.sortBy(_.firstJobId)) { + val childStages = waitingStages.filter(_.parents.contains(parent)).toArray + waitingStages --= childStages + for (stage <- childStages.sortBy(_.firstJobId)) { submitStage(stage) --- End diff -- Seems `submitWaitingChildStages ` is called to submit child stages when the given `parent` stage is available. From this observation, do we have to re-check missing parents inside `submitStage`?
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