Hi, take a look at this : http://hadoop.apache.org/common/docs/r1.0.3/Secure_Impersonation.html
I think that it can help you. Slim Tebourbi. 2012/6/7 Koert Kuipers <ko...@tresata.com> > thanks for your answer. > > so at a large place like say yahoo, or facebook, assuming they use > kerberos, every analyst that uses hive has an account on every node of > their large cluster? sounds like an admin nightmare to me > > On Thu, Jun 7, 2012 at 10:46 AM, Mapred Learn <mapred.le...@gmail.com > >wrote: > > > Yes, User submitting a job needs to have an account on all the nodes. > > > > Sent from my iPhone > > > > On Jun 7, 2012, at 6:20 AM, Koert Kuipers <ko...@tresata.com> wrote: > > > > > with kerberos enabled a mapreduce job "runs as" the user that submitted > > it. > > > does this mean the user that submitted the job needs to have linux > > accounts > > > on all machines on the cluster? > > > > > > how does mapreduce do this (run jobs as the user)? do the tasktrackers > > use > > > secure impersonation to run-as the user? > > > > > > thanks! koert > > >
