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

    https://github.com/apache/spark/pull/2332#discussion_r17334865
  
    --- Diff: 
mllib/src/main/scala/org/apache/spark/mllib/tree/configuration/Strategy.scala 
---
    @@ -61,6 +68,8 @@ class Strategy (
         val maxBins: Int = 32,
         val quantileCalculationStrategy: QuantileStrategy = Sort,
         val categoricalFeaturesInfo: Map[Int, Int] = Map[Int, Int](),
    +    val minInstancesPerNode: Int = 0,
    --- End diff --
    
    1 seems more reasonable than 0, when a spit can't split a node apart(either 
left or right child has 0 instances), this split should not be considered.


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