Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/20462#discussion_r165462812
--- Diff:
launcher/src/main/java/org/apache/spark/launcher/LauncherServer.java ---
@@ -363,17 +362,28 @@ public void close() throws IOException {
/**
* Close the connection and wait for any buffered data to be processed
before returning.
--- End diff --
My idea was getting too complicated for fix a rare race, so I'll just
update the doc here and leave that race for another time.
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