Github user brad-kaiser commented on a diff in the pull request:

    https://github.com/apache/spark/pull/19041#discussion_r177549859
  
    --- Diff: 
core/src/main/scala/org/apache/spark/ExecutorAllocationManager.scala ---
    @@ -420,63 +432,53 @@ private[spark] class ExecutorAllocationManager(
        * Request the cluster manager to remove the given executors.
        * Returns the list of executors which are removed.
        */
    -  private def removeExecutors(executors: Seq[String]): Seq[String] = 
synchronized {
    -    val executorIdsToBeRemoved = new ArrayBuffer[String]
    -
    +  private def removeExecutors(executors: Seq[String]): Unit = synchronized 
{
    --- End diff --
    
    fixed


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