Github user IngoSchuster commented on the issue:
https://github.com/apache/spark/pull/18499
Yes I believe it still makes sense to limit the number of selector threads.
Jetty's default is tuned for a real web server and by default it creates
(number of cpus / 2) selector threads. Right now we have limited the number of
threads to 8 which I believe is more than enough to serve the spark admin UI.
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