Github user yanboliang commented on a diff in the pull request:
https://github.com/apache/spark/pull/21494#discussion_r194172809
--- Diff:
core/src/main/scala/org/apache/spark/scheduler/TaskSetManager.scala ---
@@ -123,6 +124,21 @@ private[spark] class TaskSetManager(
// TODO: We should kill any running task attempts when the task set
manager becomes a zombie.
private[scheduler] var isZombie = false
+ private[scheduler] lazy val barrierCoordinator = {
--- End diff --
+1 @galv
We also have ```barrierCoordinator``` with type ```RpcEndpointRef``` at
each TaskContext, so it's better to add return type for both.
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