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In the /etc/security/limit.conf file I have added the following values:

user1      -     nproc     unlimited 
user2      -     nproc     unlimited

Both user1 and user2 have sudo privileges and I used user1 to make this change. I then logged out of the server and logged back in.

When I check as user1, the ulimit -u command goves me output 'Unlimited'. However, when I check as user2, the ulimit -u command gives me value of 10000.

Where can this value be coming from?

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It seems a cluster management process (ambari) was modifying the values for that particular user.

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