Github user susanxhuynh commented on a diff in the pull request: https://github.com/apache/spark/pull/19272#discussion_r140117055 --- Diff: resource-managers/mesos/src/main/scala/org/apache/spark/scheduler/cluster/mesos/MesosCoarseGrainedSchedulerBackend.scala --- @@ -198,16 +198,19 @@ private[spark] class MesosCoarseGrainedSchedulerBackend( sc.conf.getOption("spark.mesos.driver.frameworkId").map(_ + suffix) ) - if (principal != null) { + // check that the credentials are defined, even though it's likely that auth would have failed + // already if you've made it this far + if (principal != null && hadoopDelegationCreds.isDefined) { logDebug(s"Principal found ($principal) starting token renewer") val credentialRenewerThread = new Thread { setName("MesosCredentialRenewer") override def run(): Unit = { + val dummy: Option[Array[Byte]] = None --- End diff -- What is this for?
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