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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