Github user holdenk commented on the pull request:
https://github.com/apache/spark/pull/11310#issuecomment-189573732
If we are going to go through the effort to do a custom factory for the
thread names, looking at the future (e.g. scala 2.12) might be worth it to use
the Java interface rather than the scala wrappers provided that we don't run
into the same reporting incorrect parallelism problem. I'm going to close this
for now and investigate that option mid next week once I'm back on my feet.
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