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

    https://github.com/apache/spark/pull/6051#discussion_r30045382
  
    --- Diff: 
core/src/main/scala/org/apache/spark/deploy/SparkSubmitArguments.scala ---
    @@ -169,6 +169,8 @@ private[deploy] class SparkSubmitArguments(args: 
Seq[String], env: Map[String, S
         deployMode = Option(deployMode).orElse(env.get("DEPLOY_MODE")).orNull
         numExecutors = Option(numExecutors)
           .getOrElse(sparkProperties.get("spark.executor.instances").orNull)
    +    keytab = 
Option(keytab).orElse(sparkProperties.get("spark.yarn.keytab")).orNull
    +    principal = 
Option(principal).orElse(sparkProperties.get("spark.yarn.principal")).orNull
    --- End diff --
    
    please document the configs since you are making them public in the 
running-on-yarn.md


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