srowen commented on issue #25785: [SPARK-27812][CORE] Explicit System.exit after job's main URL: https://github.com/apache/spark/pull/25785#issuecomment-531497209 I see, can that thread be a daemon? If System.exit is viable (i.e. immediately stopping daemon threads) then it should be. But if not, then yeah such a thread needs to be shut down cleanly somehow during the shutdown process. This could be a shutdown hook.
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