Github user zsxwing commented on the pull request:
https://github.com/apache/spark/pull/11728#issuecomment-196931579
I'm ok with `max(2, availableProcessors)`.
However, the root cause is there are blocking calls in the event loops but
not enough threads. This could happen in other places (such as netty, akka).
Ideally, we should avoid blocking calls in all event loops. However, it's hard
to figure out them in the huge code bases :(
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