Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/4106#issuecomment-75864651
> The model I had in mind for this patch was to support dedicated
clusters/appliances based on Spark where the Spark cluster itself is fully
trusted and not multi-tenant.
But does trust also extends to the applications being run? Because
according to @mccheah you'd be exposing important keytabs to any job running on
that cluster. Keytabs that you may not want regular users to have access to.
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