Github user sryza commented on a diff in the pull request:
https://github.com/apache/spark/pull/4168#discussion_r24310281
--- Diff:
core/src/main/scala/org/apache/spark/ExecutorAllocationManager.scala ---
@@ -438,6 +444,7 @@ private[spark] class ExecutorAllocationManager(
}
override def onTaskStart(taskStart: SparkListenerTaskStart): Unit = {
+ numRunningTasks += 1
--- End diff --
Good point. It doesn't need synchronization because only one thread is
writing to it, but we should make it volatile.
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