Not able to create user /user/oussa_89(username)

Hold on, read this through before raising topic in this category

Are you getting Permission denied, too many logins issue?
Don’t raise new ticket. Click here for the solution. If the issue persists after 30 minutes then raise new ticket

Go through other common issues in this category before raising any issue.

unable to create user to import /export data from /to hdfs ? please check to resolve the problem . i am blocked for a Week

No need to create any user again. Our admins has already created a hdfs user for you.