Github user jinxing64 commented on a diff in the pull request:

    https://github.com/apache/spark/pull/17533#discussion_r109877754
  
    --- Diff: 
core/src/main/scala/org/apache/spark/scheduler/TaskSetManager.scala ---
    @@ -138,7 +139,7 @@ private[spark] class TaskSetManager(
       private[scheduler] var pendingTasksWithNoPrefs = new ArrayBuffer[Int]
     
       // Set containing all pending tasks (also used as a stack, as above).
    -  private val allPendingTasks = new ArrayBuffer[Int]
    +  private var allPendingTasks = new ArrayBuffer[Int]
    --- End diff --
    
    I make this `var`, because I don't have a better approach to sort 
ArrayBuffer in place. Advice?


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