Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/20462#discussion_r165432306
--- 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 --
Hmm, I think I may have thought of a somewhat simple way to fix the race
without needing the workaround in the test. Let me try that. If that doesn't
work I'll update the javadoc.
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