Github user vanzin commented on a diff in the pull request: https://github.com/apache/spark/pull/19272#discussion_r143836011 --- Diff: resource-managers/mesos/src/main/scala/org/apache/spark/scheduler/cluster/mesos/MesosCoarseGrainedSchedulerBackend.scala --- @@ -60,6 +62,8 @@ private[spark] class MesosCoarseGrainedSchedulerBackend( override def hadoopDelegationTokenManager: Option[HadoopDelegationTokenManager] = Some(new HadoopDelegationTokenManager(sc.conf, sc.hadoopConfiguration)) + private val principal = conf.get("spark.yarn.principal", null) --- End diff -- This config is defined in core already (`PRINCIPAL`).
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