jayadeep-jayaraman commented on code in PR #50020:
URL: https://github.com/apache/spark/pull/50020#discussion_r1981439320


##########
core/src/main/scala/org/apache/spark/BarrierCoordinator.scala:
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@@ -55,6 +55,7 @@ private[spark] class BarrierCoordinator(
   // fetch result, we shall fix the issue.
   private lazy val timer = ThreadUtils.newSingleThreadScheduledExecutor(
     "BarrierCoordinator barrier epoch increment timer")
+  private var timerFuture: Option[ScheduledFuture[_]] = None

Review Comment:
   Good point, I think I will use 
[CopyOnWriteArrayList](http://download.oracle.com/javase/7/docs/api/java/util/concurrent/CopyOnWriteArrayList.html)
 to hold the futures. What do you think ?



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