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[SPARK-27496][CORE] Fatal errors should also be sent back to the sender
## What changes were proposed in this pull request? When a fatal error (such as StackOverflowError) throws from "receiveAndReply", we should try our best to notify the sender. Otherwise, the sender will hang until timeout. In addition, when a MessageLoop is dying unexpectedly, it should resubmit a new one so that Dispatcher is still working. ## How was this patch tested? New unit tests. Closes #24396 from zsxwing/SPARK-27496. Authored-by: Shixiong Zhu <email@example.com> Signed-off-by: Dongjoon Hyun <firstname.lastname@example.org> (cherry picked from commit 009059e) Signed-off-by: Dongjoon Hyun <email@example.com>
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