Github user vanzin commented on a diff in the pull request: https://github.com/apache/spark/pull/20462#discussion_r165245388 --- Diff: launcher/src/main/java/org/apache/spark/launcher/AbstractAppHandle.java --- @@ -42,9 +42,9 @@ protected AbstractAppHandle(LauncherServer server) { } @Override - public synchronized void addListener(Listener l) { + public void addListener(Listener l) { --- End diff -- I should add this one back.
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