Github user srowen commented on the issue:
https://github.com/apache/spark/pull/13562
OK fair enough, worth keeping in mind as I know any little helps for build
times. For machines that aren't loaded, any parallelism could help, even `-T
2`. For machines that are, in theory things don't get any slower since the
machine is 100% busy, though in practice we may find some grinding.
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