Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/21898#discussion_r207758158
--- Diff:
core/src/main/scala/org/apache/spark/scheduler/TaskSchedulerImpl.scala ---
@@ -566,6 +579,9 @@ private[spark] class TaskSchedulerImpl(
if (taskResultGetter != null) {
taskResultGetter.stop()
}
+ if (barrierCoordinator != null) {
--- End diff --
maybe we should not use `lazy val`, but use `var` and control the
initialization ourselves.
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