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

    https://github.com/apache/spark/pull/17430#discussion_r108046680
  
    --- Diff: 
core/src/main/scala/org/apache/spark/deploy/SparkSubmitArguments.scala ---
    @@ -190,6 +190,7 @@ private[deploy] class SparkSubmitArguments(args: 
Seq[String], env: Map[String, S
           .orNull
         numExecutors = Option(numExecutors)
           .getOrElse(sparkProperties.get("spark.executor.instances").orNull)
    +    queue = 
Option(queue).orElse(sparkProperties.get("spark.yarn.queue")).getOrElse("default")
    --- End diff --
    
    instead of `.getOrElse("default")`, i think it should be `orNull` - we 
don't know the default queue name of the system since it could change?


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