srowen commented on issue #24056: [SPARK-26152] Synchronize Worker Cleanup with Worker Shutdown URL: https://github.com/apache/spark/pull/24056#issuecomment-472032753 I agree that the isShutdown check and submission should be atomic, but don't know how worthwhile it is. The lock is worrisome. Instead, the pool could be changed to not throw an exception if it's submitted after shutdown.
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