Github user tgravescs commented on a diff in the pull request:
https://github.com/apache/spark/pull/22288#discussion_r224111068
--- Diff:
core/src/main/scala/org/apache/spark/scheduler/TaskSchedulerImpl.scala ---
@@ -117,6 +117,10 @@ private[spark] class TaskSchedulerImpl(
protected val executorIdToHost = new HashMap[String, String]
+ private val abortTimer = new Timer(true)
--- End diff --
we should cancel the timer in the stop() call
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