Github user zsxwing commented on a diff in the pull request:
    --- Diff: core/src/main/scala/org/apache/spark/SparkContext.scala ---
    @@ -383,8 +383,9 @@ class SparkContext(config: SparkConf) extends Logging 
with ExecutorAllocationCli
           logInfo("Spark configuration:\n" + _conf.toDebugString)
    -    // Set Spark driver host and port system properties
    -    _conf.setIfMissing("", Utils.localHostName())
    +    // Set Spark driver host and port system properties. This explicitly 
sets the configuration
    +    // instead of relying on the default value of the config constant.
    +    _conf.set(DRIVER_HOST_ADDRESS, conf.get(DRIVER_HOST_ADDRESS))
    --- End diff --
    nit: could you use `_conf` instead? I thought `_conf` and `conf` were 
different at first glance. But actually they are same.

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