Github user MLnick commented on a diff in the pull request: https://github.com/apache/spark/pull/12660#discussion_r61392206 --- Diff: mllib/src/test/scala/org/apache/spark/ml/recommendation/ALSSuite.scala --- @@ -512,6 +514,55 @@ class ALSSuite assert(getFactors(model.userFactors) === getFactors(model2.userFactors)) assert(getFactors(model.itemFactors) === getFactors(model2.itemFactors)) } + + test("StorageLevel param") { + // test invalid param values + intercept[IllegalArgumentException] { + new ALS().setIntermediateRDDStorageLevel("foo") + } + intercept[IllegalArgumentException] { + new ALS().setIntermediateRDDStorageLevel("NONE") + } + intercept[IllegalArgumentException] { + new ALS().setFinalRDDStorageLevel("foo") + } + // test StorageLevels + val sqlContext = this.sqlContext + import sqlContext.implicits._ + val (ratings, _) = genExplicitTestData(numUsers = 2, numItems = 2, rank = 1) + val data = ratings.toDF + val als = new ALS().setMaxIter(1) + als.fit(data) + val factorRDD = sc.getPersistentRDDs.collect { + case (id, rdd) if rdd.name == "userFactors" => rdd + }.head + assert(factorRDD.getStorageLevel == StorageLevel.MEMORY_AND_DISK) + val listener = new RDDStorageListener + sc.addSparkListener(listener) + als + .setFinalRDDStorageLevel("MEMORY_ONLY") + .setIntermediateRDDStorageLevel("DISK_ONLY") + .fit(data) + val level = sc.getRDDStorageInfo { rdd => + rdd.name == "userFactors" && rdd.id != factorRDD.id + }.head.storageLevel + assert(level == StorageLevel.MEMORY_ONLY) + listener.infos.foreach(level => assert(level == StorageLevel.DISK_ONLY)) + } +} + +private class RDDStorageListener extends SparkListener { + + var infos: Seq[StorageLevel] = Seq() + + override def onStageCompleted(stageCompleted: SparkListenerStageCompleted): Unit = { + val info = stageCompleted.stageInfo.rddInfos.collect { + case info if info.name.contains("Blocks") || info.name.contains("Factors-") => + info.storageLevel + } + infos = info --- End diff -- I can amend it to collect all the intermediates, but I set maxIter to `1` so it should only have 1 iterations worth. In any case I'll amend this slightly to append to `infos`, that way if any `stageInfo` contains the intermediate RDD infos, it will be appended otherwise not.
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