Github user Colin-Yu commented on a diff in the pull request:

    https://github.com/apache/spark/pull/12154#discussion_r58483960
  
    --- Diff: core/src/main/scala/org/apache/spark/SparkContext.scala ---
    @@ -1360,6 +1360,16 @@ class SparkContext(config: SparkConf) extends 
Logging with ExecutorAllocationCli
         listenerBus.addListener(listener)
       }
     
    +  private[spark] override def getExecutorIds(): Seq[String] = {
    --- End diff --
    
    A newbie question: if a method has no side effect and return values, do 
code standard in spark suggest to remove parenthesis in method declaration?


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