Github user yolandagao commented on the pull request:

    https://github.com/apache/spark/pull/9272#issuecomment-153287881
  
    Hi folks, 
    Yarn Client.scala checks the setting from argStrings (passed from 
SparkSubmit) and sparkConf (which loads java system properties starting with 
spark.* as well). The args settings (--principal, --keytab) will not be 
available in spark sql, but we can take advantage of SparkConf with system 
properties. Updated the pull request and tested. Please advise if this is what 
you are looking for, Thank you!


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