Github user jerryshao commented on a diff in the pull request:

    https://github.com/apache/spark/pull/20657#discussion_r175638637
  
    --- Diff: 
resource-managers/mesos/src/main/scala/org/apache/spark/scheduler/cluster/mesos/MesosHadoopDelegationTokenManager.scala
 ---
    @@ -105,7 +105,8 @@ private[spark] class MesosHadoopDelegationTokenManager(
                 case e: Exception =>
                   // Log the error and try to write new tokens back in an hour
                   logWarning("Couldn't broadcast tokens, trying again in an 
hour", e)
    --- End diff --
    
    Shall we update the log to reflect the configured waiting hour.


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