Github user holdenk commented on the pull request:
https://github.com/apache/spark/pull/11287#issuecomment-186900836
I did some digging into why its 32 in jenkins and 4 on my machine - digging
into the Scala internals it seems that the (private) FutureTasks doesn't
actually look at the provided threadpool when determining parallelism rather it
looks at the system. I'll close this for now and look at switching this over to
ForkJoinTaskSupport (although it makes it pretty difficult to name the thread
pool something meaningful :( ).
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