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

    https://github.com/apache/spark/pull/21027#discussion_r208468697
  
    --- Diff: 
resource-managers/mesos/src/main/scala/org/apache/spark/deploy/rest/mesos/MesosRestServer.scala
 ---
    @@ -50,6 +50,24 @@ private[spark] class MesosRestServer(
         new MesosKillRequestServlet(scheduler, masterConf)
       protected override val statusRequestServlet =
         new MesosStatusRequestServlet(scheduler, masterConf)
    +
    +  override def isServerHealthy(): Boolean = 
!scheduler.isSchedulerDriverStopped()
    +
    +  override def serverStatus(): ServerStatusResponse = {
    +    val s = new ServerStatusResponse
    +    s.schedulerDriverStopped = scheduler.isSchedulerDriverStopped()
    +    s.queuedDrivers = scheduler.getQueuedDriversSize
    +    s.launchedDrivers = scheduler.getLaunchedDriversSize
    +    s.pendingRetryDrivers = scheduler.getPendingRetryDriversSize
    +    s.success = true
    +    s.message = "iamok"
    --- End diff --
    
    How about leaving this blank?


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