Github user tgravescs commented on the pull request:
https://github.com/apache/spark/pull/663#issuecomment-42335595
This doesn't dynamically change the thread pool size. Its basically limited
at 10 since its using a LinkedBlockingQueue. And the value of the
maximumPoolSize doesn't have any effect. The MR AM has code to change the size
and also has a config for max limit.
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