Github user tedyu commented on the pull request: https://github.com/apache/spark/pull/9054#issuecomment-147150006 Background: http://stackoverflow.com/questions/19528304/how-to-get-the-threadpoolexecutor-to-increase-threads-to-max-before-queueing/19528305#19528305 Toward the end of the thread you would see LifoThreadPoolExecutorSQP which is unfortunately not Apache License.
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