Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/9054#issuecomment-147104530
The cached thread pool does not create threads if threads are available:
http://docs.oracle.com/javase/7/docs/api/java/util/concurrent/Executors.html#newCachedThreadPool()
Why do you think ForkJoinPool is better?
http://docs.oracle.com/javase/7/docs/api/java/util/concurrent/ForkJoinPool.html
It is for contexts where threads create lots of small tasks. That's not the
case here.
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