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

    https://github.com/apache/spark/pull/14650#discussion_r79348228
  
    --- Diff: 
mesos/src/main/scala/org/apache/spark/deploy/mesos/MesosClusterDispatcherArguments.scala
 ---
    @@ -73,37 +94,55 @@ private[mesos] class 
MesosClusterDispatcherArguments(args: Array[String], conf:
           propertiesFile = value
           parse(tail)
     
    +    case ("--conf") :: value :: tail =>
    +      MesosClusterDispatcher.
    +        parseSparkConfProperty(value, (k: String, v: String) => 
confProperties(k) = v)
    +      parse(tail)
    +
         case ("--help") :: tail =>
    -      printUsageAndExit(0)
    +        printUsageAndExit(0)
    +
    +    case ("--verbose") :: tail =>
    +      verbose = true
    +      parse(tail)
     
         case Nil =>
    -      if (masterUrl == null) {
    +      if (Option(masterUrl).isEmpty) {
             // scalastyle:off println
    -        System.err.println("--master is required")
    +        MesosClusterDispatcher.printStream.println("--master is required")
             // scalastyle:on println
             printUsageAndExit(1)
           }
     
    -    case _ =>
    +    case value@_ =>
    --- End diff --
    
    `case value =>` or maybe I misunderstand why it's written this way


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