Github user vanzin commented on a diff in the pull request: https://github.com/apache/spark/pull/19272#discussion_r149235641 --- Diff: resource-managers/mesos/src/main/scala/org/apache/spark/scheduler/cluster/mesos/MesosCoarseGrainedSchedulerBackend.scala --- @@ -213,6 +216,14 @@ private[spark] class MesosCoarseGrainedSchedulerBackend( sc.conf.getOption("spark.mesos.driver.frameworkId").map(_ + suffix) ) + // check that the credentials are defined, even though it's likely that auth would have failed + // already if you've made it this far, then start the token renewer + if (hadoopDelegationTokens.isDefined) { --- End diff -- You shouldn't do this here, otherwise you need to keep that field `protected` in the parent class and that adds unnecessary coupling. Instead, do this in `initializeHadoopDelegationTokens`.
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