liupc 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_r263985040
##########
File path: core/src/main/scala/org/apache/spark/ExecutorAllocationManager.scala
##########
@@ -725,10 +725,15 @@ 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) &&
+ client.getExecutorIds().contains(executorId)) {
Review comment:
@vanzin Seems 2 spaces indent is suggested, isn't it? I checked several
scala classes of spark project, the indention of similar codes are indented by
2 spaces. What's the prefer one we suggested?
https://github.com/apache/spark/blob/57ae251f75cef4ad5478c42709870a1666ddad46/core/src/main/scala/org/apache/spark/scheduler/TaskSetManager.scala#L499
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