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

    https://github.com/apache/spark/pull/15152#discussion_r79884998
  
    --- Diff: 
core/src/main/scala/org/apache/spark/ExecutorAllocationClient.scala ---
    @@ -54,13 +54,16 @@ private[spark] trait ExecutorAllocationClient {
     
       /**
        * Request that the cluster manager kill the specified executors.
    -   * @return whether the request is acknowledged by the cluster manager.
    +   * @return the ids of the executors acknowledged by the cluster manager 
to be removed.
        */
    -  def killExecutors(executorIds: Seq[String]): Boolean
    +  def killExecutors(executorIds: Seq[String]): Seq[String]
     
       /**
        * Request that the cluster manager kill the specified executor.
        * @return whether the request is acknowledged by the cluster manager.
        */
    -  def killExecutor(executorId: String): Boolean = 
killExecutors(Seq(executorId))
    +  def killExecutor(executorId: String): Boolean = {
    +    val killedExecutors = killExecutors(Seq(executorId))
    +    killedExecutors.nonEmpty && killedExecutors(0).equals(executorId)
    --- End diff --
    
    I seriously hope the backend is not killing some random executor instead of 
the one that was asked...


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