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

    https://github.com/apache/spark/pull/14414#discussion_r73386197
  
    --- Diff: 
core/src/main/scala/org/apache/spark/deploy/mesos/ui/MesosClusterPage.scala ---
    @@ -28,10 +28,17 @@ import 
org.apache.spark.scheduler.cluster.mesos.MesosClusterSubmissionState
     import org.apache.spark.ui.{UIUtils, WebUIPage}
     
     private[mesos] class MesosClusterPage(parent: MesosClusterUI) extends 
WebUIPage("") {
    +  private val historyServerURL = 
parent.conf.getOption("spark.mesos.dispatcher.historyServer.url")
    +
       def render(request: HttpServletRequest): Seq[Node] = {
         val state = parent.scheduler.getSchedulerState()
    -    val queuedHeaders = Seq("Driver ID", "Submit Date", "Main Class", 
"Driver Resources")
    -    val driverHeaders = queuedHeaders ++
    +
    +    val driverHeader = Seq("Driver ID")
    --- End diff --
    
    Just so I can concatenate the sequences to produce a list of headers


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