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

    https://github.com/apache/spark/pull/8945#discussion_r41775279
  
    --- Diff: 
core/src/test/scala/org/apache/spark/deploy/StandaloneDynamicAllocationSuite.scala
 ---
    @@ -369,6 +369,38 @@ class StandaloneDynamicAllocationSuite
         assert(apps.head.getExecutorLimit === 1)
       }
     
    +  test("the pending replacement executors should not be lost 
(SPARK-10515)") {
    +    sc = new SparkContext(appConf)
    +    val appId = sc.applicationId
    +    eventually(timeout(10.seconds), interval(10.millis)) {
    +      val apps = getApplications()
    +      assert(apps.size === 1)
    +      assert(apps.head.id === appId)
    +      assert(apps.head.executors.size === 2)
    +      assert(apps.head.getExecutorLimit === Int.MaxValue)
    +    }
    +    // sync executors between the Master and the driver, needed because
    +    // the driver refuses to kill executors it does not know about
    +    syncExecutors(sc)
    +    val executors = getExecutorIds(sc)
    +    assert(executors.size === 2)
    +
    +    // kill executor 1, and replace it
    +    assert(sc.killAndReplaceExecutor(executors.head))
    +    var apps = getApplications()
    +    assert(apps.head.executors.size === 2)
    --- End diff --
    
    I understand that. But what I'm saying is, in the master's view of the 
world, what happens is that one executor goes away and a new executor comes up. 
So there may be a window in which the executor count, as seen from the master, 
is "1", temporarily, before the new executor starts. And that would cause your 
test to fail sporadically.


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