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

    https://github.com/apache/spark/pull/14359#discussion_r79679122
  
    --- Diff: 
mllib/src/main/scala/org/apache/spark/ml/tree/impl/RandomForest.scala ---
    @@ -161,31 +161,42 @@ private[spark] object RandomForest extends Logging {
           None
         }
     
    -    // FIFO queue of nodes to train: (treeIndex, node)
    -    val nodeQueue = new mutable.Queue[(Int, LearningNode)]()
    +    /*
    +      Stack of nodes to train: (treeIndex, node)
    +      The reason this is FILO is that we train many trees at once, but we 
want to focus on
    --- End diff --
    
    "The reason this is FILO" -> "The reason we use a stack"


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