Github user zsxwing commented on the pull request:
https://github.com/apache/spark/pull/13355#issuecomment-222206865
This configuration is for people setting a custom thread number for their
special environments. I don't want to keep increasing this number when someone
complains the default thread number is too small.
Instead of this fix, I prefer to fix the real issue you mentioned in JIRA.
You can just make `removeExecutor` in #13055 asynchronous.
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