Github user mgaido91 commented on a diff in the pull request:

    https://github.com/apache/incubator-livy/pull/107#discussion_r219769059
  
    --- Diff: server/src/main/scala/org/apache/livy/server/LivyServer.scala ---
    @@ -115,6 +117,16 @@ class LivyServer extends Logging {
             error("Failed to run kinit, stopping the server.")
             sys.exit(1)
           }
    +      // This is and should be the only place where a login() on the UGI 
is performed.
    --- End diff --
    
    Actually this wouldn't really work as - for instance - 
`UserGroupInformation.loginUserFromKeytabAndReturnUGI` is ok to be called, as 
it doesn't perform a `UserGroupInformation.login()`. We can list all the APIs 
which we should not call, but I am not sure it is worth.


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