Github user mccheah commented on the pull request:
https://github.com/apache/spark/pull/4106#issuecomment-75878253
One other model that would make sense is to require the driver to log in
using the principal and the keytab specified in the configuration. If the
driver is able to authenticate to Kerberos, then that assumes that the user
submitting the Spark job already had access to the keytab independent of Spark
anyways, and Spark is just one way they leverage their permissions to access
HDFS. I already need the driver to log in at HadoopRDD.getPartitions and
PairRDDFunctions.saveAsHadoopDataset.
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