Github user zsxwing commented on the issue: https://github.com/apache/spark/pull/22176 @markhamstra That's a good point. However, since this is just following our current codes if you check the usages of `newDaemonCachedThreadPool`, and the changes here should be safe considering how we use them, I don't want to block this PR for this reason. We can open a new ticket to add configurations if that's necessary.
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