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Increase open file limit of the user to scale for large data processing

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Increase open file limit of the user to scale for large data processing

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I see this suggestion on smartsense for my cluster and below steps on how to performe it

https://community.hortonworks.com/questions/208928/increase-open-file-limit-of-the-user-to-scale-for...

But my concerning is, How to get a value to set the ulimit value for each user within my cluster, is there any sort of formula I am not aware of? or I need to check something within my cluster? I don't know, I am thinking on the amount of process ran by each user and based on that, to set a number. But even if I I do this, again ... what is the fundamental on setting a value x or y?

Any hint?

Regards!