srowen commented on a change in pull request #24531: [SPARK-27636][MLLIB]Remove cached RDD blocks after PIC execution URL: https://github.com/apache/spark/pull/24531#discussion_r281042454
########## File path: mllib/src/main/scala/org/apache/spark/mllib/clustering/PowerIterationClustering.scala ########## @@ -226,11 +226,14 @@ class PowerIterationClustering private[clustering] ( */ private def pic(w: Graph[Double, Double]): PowerIterationClusteringModel = { val v = powerIter(w, maxIterations) - val assignments = kMeans(v, k).mapPartitions({ iter => + val kMeansModel = kMeans(v, k) + val assignments = kMeansModel.mapPartitions({ iter => iter.map { case (id, cluster) => Assignment(id, cluster) } - }, preservesPartitioning = true) + }, preservesPartitioning = true).cache() + assignments.count() + kMeansModel.unpersist() Review comment: I think we can just avoid having the result of kMeans be persisted to begin with, see below ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org With regards, Apache Git Services --------------------------------------------------------------------- To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org