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

    https://github.com/apache/spark/pull/15009#discussion_r106236820
  
    --- Diff: 
launcher/src/main/java/org/apache/spark/launcher/SparkLauncher.java ---
    @@ -73,6 +74,12 @@
       /** Logger name to use when launching a child process. */
       public static final String CHILD_PROCESS_LOGGER_NAME = 
"spark.launcher.childProcLoggerName";
     
    +  public static final String LAUNCHER_INTERNAL_PORT = 
"spark.launcher.internal.port";
    --- End diff --
    
    I'm not a fan of having these public variables. This is a public class so 
we should try to hide anything that is internal to Spark from the API.
    
    A way of doing this would be to leave this as package-private, and move the 
code that connects to the launcher from `Client.scala` to 
`YarnCommandBuilderUtils.scala`, since the latter is in the launcher package. 
And perhaps rename the latter to `YarnLauncherUtils.scala` since it would be 
doing more than just what it does now.


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