Github user rvesse commented on a diff in the pull request:

    https://github.com/apache/spark/pull/21669#discussion_r208530663
  
    --- Diff: 
resource-managers/kubernetes/core/src/main/scala/org/apache/spark/deploy/k8s/Config.scala
 ---
    @@ -212,6 +212,60 @@ private[spark] object Config extends Logging {
             "Ensure that major Python version is either Python2 or Python3")
           .createWithDefault("2")
     
    +  val KUBERNETES_KERBEROS_PROXY_USER =
    +    ConfigBuilder("spark.kubernetes.kerberos.proxyUser")
    +      .doc("Specify the proxy user " +
    +        "for HadoopUGI login for the Driver + Executors")
    +      .internal()
    +      .stringConf
    +      .createWithDefault("false")
    +
    +  val KUBERNETES_KERBEROS_KRB5_FILE =
    +    ConfigBuilder("spark.kubernetes.kerberos.krb5location")
    +      .doc("Specify the location of the krb5 file " +
    --- End diff --
    
    Presumably this is referring to the Kerberos configuration file indicating 
the location of the KDC?


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