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

    https://github.com/apache/spark/pull/1313#discussion_r15563577
  
    --- Diff: 
core/src/main/scala/org/apache/spark/scheduler/TaskSetManager.scala ---
    @@ -751,20 +787,7 @@ private[spark] class TaskSetManager(
         levels.toArray
       }
     
    -  // Re-compute pendingTasksWithNoPrefs since new preferred locations may 
become available
       def executorAdded() {
    -    def newLocAvail(index: Int): Boolean = {
    -      for (loc <- tasks(index).preferredLocations) {
    -        if (sched.hasExecutorsAliveOnHost(loc.host) ||
    -           (sched.getRackForHost(loc.host).isDefined &&
    -           sched.hasHostAliveOnRack(sched.getRackForHost(loc.host).get))) {
    -          return true
    -        }
    -      }
    -      false
    -    }
    -    logInfo("Re-computing pending task lists.")
    -    pendingTasksWithNoPrefs = 
pendingTasksWithNoPrefs.filter(!newLocAvail(_))
    --- End diff --
    
    Ah okay, makes sense.


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