zsxwing commented on issue #24796: [SPARK-27900][CORE] Add uncaught exception handler to the driver URL: https://github.com/apache/spark/pull/24796#issuecomment-499298514 > If this is removed, I am not sure what goes wrong. If `onStop` happens before or after an `onReceive` during shutdown, that's fine. If it happens during `onReceive`, well, it has already been interrupted and won't complete normally. The potential issue is about thread-safety. Right now EventLoop ensures all `onXXX` calls run in sequence without any overlapping.
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