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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