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Hadoop >> mail # user >> kerberos mapreduce question

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Re: kerberos mapreduce question
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 <[EMAIL PROTECTED]>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 <[EMAIL PROTECTED]> 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