Github user mccheah commented on the pull request:
https://github.com/apache/spark/pull/4106#issuecomment-70553855
One other caveat I forgot to mention, and the commit message should be
updated and this reflected in the docs: User proxying needs to be enabled.
Basically, the user principal configured to access the Hadoop cluster should
not be the user that is running the spark job. Suppose the Hadoop principal is
userHadoop and the spark user is userSpark. When I run the Spark job, I need
userHadoop's privileges, but don't want to run the job as userHadoop. So we
have userHadoop impersonate userSpark by using
UserGroupInformation.createProxyUser(). HOWEVER this requires that user proxies
are configured properly. For details see
http://hadoop.apache.org/docs/r1.2.1/Secure_Impersonation.html
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