Github user sujithjay commented on a diff in the pull request:
https://github.com/apache/spark/pull/20956#discussion_r178517357
--- Diff:
mllib/src/main/scala/org/apache/spark/ml/tree/impl/NodeIdCache.scala ---
@@ -95,7 +95,7 @@ private[spark] class NodeIdCache(
splits: Array[Array[Split]]): Unit = {
if (prevNodeIdsForInstances != null) {
// Unpersist the previous one if one exists.
- prevNodeIdsForInstances.unpersist()
+ prevNodeIdsForInstances.unpersist(false)
--- End diff --
Is this change required? Should not the call to `unpersist` remain blocking?
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