vanzin commented on a change in pull request #23842: [SPARK-26927]Fix race
condition may cause dynamic allocation not working
URL: https://github.com/apache/spark/pull/23842#discussion_r262661848
##########
File path: core/src/main/scala/org/apache/spark/ExecutorAllocationManager.scala
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@@ -725,10 +740,15 @@ private[spark] class ExecutorAllocationManager(
if (stageIdToNumRunningTask.contains(stageId)) {
stageIdToNumRunningTask(stageId) += 1
}
- // This guards against the race condition in which the
`SparkListenerTaskStart`
- // event is posted before the `SparkListenerBlockManagerAdded` event,
which is
- // possible because these events are posted in different threads. (see
SPARK-4951)
- if (!allocationManager.executorIds.contains(executorId)) {
+ // This guards against the following race condition:
+ // 1. The `SparkListenerTaskStart` event is posted before the
+ // `SparkListenerExecutorAdded` event
+ // 2. The `SparkListenerExecutorRemoved` event is posted before the
+ // `SparkListenerTaskStart` event
+ // Above cases are possible because these events are posted in
different threads.
+ // (see SPARK-4951 SPARK-26927)
+ if (!allocationManager.executorIds.contains(executorId) &&
+ !allocationManager.removedExecutorIds.contains(executorId)) {
Review comment:
I thought that my suggestion might affect the other race ("task start before
executor added" race), but I think it would be fine; I don't believe the
scheduler would post a task start if the executor was not tracked internally
already.
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