Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/475#discussion_r12311588
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/tree/DecisionTree.scala ---
@@ -68,7 +69,28 @@ class DecisionTree (private val strategy: Strategy)
extends Serializable with Lo
val parentImpurities = new Array[Double](maxNumNodes)
// dummy value for top node (updated during first split calculation)
val nodes = new Array[Node](maxNumNodes)
+ // num features
+ val numFeatures = input.take(1)(0).features.size
+
+ // Calculate level for single group construction
+ // Max memory usage for aggregates
+ val maxMemoryUsage = strategy.maxMemoryInMB * 1024 * 1024
+ logDebug("max memory usage for aggregates = " + maxMemoryUsage)
--- End diff --
`+ "bytes."`?
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