Generating a Data Fabric Ticket from a Kerberos Ticket
About this task
On clusters that use Kerberos for authentication, a 
            Data Fabric ticket is implicitly obtained for a user that
            runs a 
            Data Fabric command without first using the
               maprlogin utility.
If you want to use a Kerberos ticket to generate a maprticket, follow
            these procedure below.
Procedure
- 
            Obtain a Kerberos identity by running 
kinitor by another mechanism. - 
            Run 
maprlogin kerberosto indicate that you have an existing Kerberos ticket. You can also specify these options:[ -cluster ]The name of the cluster.[ -duration ]The ticket duration in seconds.