Github user sahilTakiar commented on a diff in the pull request: https://github.com/apache/spark/pull/20893#discussion_r177577783 --- Diff: core/src/main/scala/org/apache/spark/launcher/LauncherBackend.scala --- @@ -114,10 +114,10 @@ private[spark] abstract class LauncherBackend { override def close(): Unit = { try { + _isConnected = false super.close() } finally { onDisconnected() --- End diff -- Yeah, your right, it doesn't look like `onDisconnected` is being used anywhere, but its marked as `protected` so I guess its meant to be used by a sub-class (although no sub-class uses it). So agree, this change should be safe, it doesn't change the semantics of any use of `onDisconnected`
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