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

    https://github.com/apache/spark/pull/4688#discussion_r25988487
  
    --- Diff: 
yarn/src/main/scala/org/apache/spark/deploy/yarn/YarnSparkHadoopUtil.scala ---
    @@ -82,6 +100,179 @@ class YarnSparkHadoopUtil extends SparkHadoopUtil {
         if (credentials != null) credentials.getSecretKey(new Text(key)) else 
null
       }
     
    +  private[spark] override def scheduleLoginFromKeytab(): Unit = {
    +    sparkConf.getOption("spark.yarn.principal").foreach { principal =>
    +      val keytab = sparkConf.get("spark.yarn.keytab")
    +      val delegationTokenRenewerRunnable =
    --- End diff --
    
    The reason it is not stashed away in a lazy is because the principal and 
keytab would need to be instance vars if we did. By doing this, I can avoid 
that.


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