Github user mccheah commented on the pull request:
https://github.com/apache/spark/pull/4106#issuecomment-75858920
I'm confused as to how this case is different from anywhere else we use
Kerberos authentication to HDFS in Spark. If HDFS is configured with Kerberos
authentication, naturally any client that writes and reads from HDFS needs to
authenticate using Kerberos, using a particular keytab and a principal
associated with that keytab. I used a proxy user to avoid actually running as
the HDFS user though. See StandaloneSparkHadoopUtil.
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