Will users notice any performance difference if a M/R Script is currently running using 4/5 processors we are allotted? How about 5/5? Or maybe a better way to ask; Is there any downfall to using the highest Concurrency Limit on a M/R deployment?

NS once alluded to there being a slight performance decrease when using all the processors on a MR script, however I think it would be based on what the script was doing and how long it was running. As for using all processors, other MR scripts would stay as pending until that script had finished I believe - so not the best idea unless you can schedule out of hours

Thanks for the reply