Github user viirya commented on a diff in the pull request:
    --- Diff: 
core/src/main/scala/org/apache/spark/deploy/worker/DriverWrapper.scala ---
    @@ -38,8 +39,10 @@ object DriverWrapper {
           case workerUrl :: userJar :: mainClass :: extraArgs =>
             val conf = new SparkConf()
    -        val rpcEnv = RpcEnv.create("Driver",
    -          Utils.localHostName(), 0, conf, new SecurityManager(conf))
    +        val host: String = Utils.localHostName()
    --- End diff --
    I think it is reasonable to use `Utils.localHostName()`. But what is 
`` for?

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