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https://issues.apache.org/jira/browse/SPARK-28927?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen updated SPARK-28927:
------------------------------
Issue Type: Improvement (was: Bug)
Priority: Minor (was: Major)
Summary: Improve error for ArrayIndexOutOfBoundsException and Not-stable
AUC metrics in ALS for datasets with 12 billion instances (was:
ArrayIndexOutOfBoundsException and Not-stable AUC metrics in ALS for datasets
with 12 billion instances)
> Improve error for ArrayIndexOutOfBoundsException and Not-stable AUC metrics
> in ALS for datasets with 12 billion instances
> -------------------------------------------------------------------------------------------------------------------------
>
> Key: SPARK-28927
> URL: https://issues.apache.org/jira/browse/SPARK-28927
> Project: Spark
> Issue Type: Improvement
> Components: ML
> Affects Versions: 2.2.1
> Reporter: Qiang Wang
> Assignee: Liang-Chi Hsieh
> Priority: Minor
> Attachments: image-2019-09-02-11-55-33-596.png
>
>
> The stack trace is below:
> {quote}19/08/28 07:00:40 WARN Executor task launch worker for task 325074
> BlockManager: Block rdd_10916_493 could not be removed as it was not found on
> disk or in memory 19/08/28 07:00:41 ERROR Executor task launch worker for
> task 325074 Executor: Exception in task 3.0 in stage 347.1 (TID 325074)
> java.lang.ArrayIndexOutOfBoundsException: 6741 at
> org.apache.spark.dpshade.recommendation.ALS$$anonfun$org$apache$spark$ml$recommendation$ALS$$computeFactors$1.apply(ALS.scala:1460)
> at
> org.apache.spark.dpshade.recommendation.ALS$$anonfun$org$apache$spark$ml$recommendation$ALS$$computeFactors$1.apply(ALS.scala:1440)
> at
> org.apache.spark.rdd.PairRDDFunctions$$anonfun$mapValues$1$$anonfun$apply$40$$anonfun$apply$41.apply(PairRDDFunctions.scala:760)
> at
> org.apache.spark.rdd.PairRDDFunctions$$anonfun$mapValues$1$$anonfun$apply$40$$anonfun$apply$41.apply(PairRDDFunctions.scala:760)
> at scala.collection.Iterator$$anon$11.next(Iterator.scala:409) at
> org.apache.spark.storage.memory.MemoryStore.putIteratorAsValues(MemoryStore.scala:216)
> at
> org.apache.spark.storage.BlockManager$$anonfun$doPutIterator$1.apply(BlockManager.scala:1041)
> at
> org.apache.spark.storage.BlockManager$$anonfun$doPutIterator$1.apply(BlockManager.scala:1032)
> at org.apache.spark.storage.BlockManager.doPut(BlockManager.scala:972) at
> org.apache.spark.storage.BlockManager.doPutIterator(BlockManager.scala:1032)
> at
> org.apache.spark.storage.BlockManager.getOrElseUpdate(BlockManager.scala:763)
> at org.apache.spark.rdd.RDD.getOrCompute(RDD.scala:334) at
> org.apache.spark.rdd.RDD.iterator(RDD.scala:285) at
> org.apache.spark.rdd.CoGroupedRDD$$anonfun$compute$2.apply(CoGroupedRDD.scala:141)
> at
> org.apache.spark.rdd.CoGroupedRDD$$anonfun$compute$2.apply(CoGroupedRDD.scala:137)
> at
> scala.collection.TraversableLike$WithFilter$$anonfun$foreach$1.apply(TraversableLike.scala:733)
> at scala.collection.immutable.List.foreach(List.scala:381) at
> scala.collection.TraversableLike$WithFilter.foreach(TraversableLike.scala:732)
> at org.apache.spark.rdd.CoGroupedRDD.compute(CoGroupedRDD.scala:137) at
> org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:323) at
> org.apache.spark.rdd.RDD.iterator(RDD.scala:287) at
> org.apache.spark.rdd.MapPartitionsRDD.compute(MapPartitionsRDD.scala:38) at
> org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:323) at
> org.apache.spark.rdd.RDD.iterator(RDD.scala:287) at
> org.apache.spark.rdd.MapPartitionsRDD.compute(MapPartitionsRDD.scala:38) at
> org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:323) at
> org.apache.spark.rdd.RDD.iterator(RDD.scala:287) at
> org.apache.spark.rdd.MapPartitionsRDD.compute(MapPartitionsRDD.scala:38) at
> org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:323) at
> org.apache.spark.rdd.RDD.iterator(RDD.scala:287) at
> org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:96) at
> org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:53) at
> org.apache.spark.scheduler.Task.run(Task.scala:108) at
> org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:358) at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:745)
> {quote}
> This exception happened sometimes. And we also found that the AUC metric was
> not stable when evaluating the inner product of the user factors and the item
> factors with the same dataset and configuration. AUC varied from 0.60 to 0.67
> which was not stable for production environment.
> Dataset capacity: ~12 billion ratings
> Here is the our code:
> {code:java}
> val hivedata = sc.sql(sqltext).select("id", "dpid", "score", "tag")
> .repartition(6000).persist(StorageLevel.MEMORY_AND_DISK_SER)
> val zeroValueArrItem = ArrayBuffer[(String, Int)]()
> val predataItem = hivedata.
> map(r => (r.getString(0), (r.getString(1), r.getInt(2)))).rdd.
> aggregateByKey(zeroValueArrItem, 6000)((a, b) => a += b, (a, b) => a ++ b).
> zipWithIndex().
> setName(predataItemName).
> persist(StorageLevel.MEMORY_AND_DISK_SER)
> val zeroValueArr = ArrayBuffer[(Int, Int)]()
> val predataUser = predataItem.
> flatMap(r => r._1._2.map(y => (y._1, (r._2.toInt, y._2)))).
> aggregateByKey(zeroValueArr, 6000)((a, b) => a += b, (a, b) => a ++ b).
>
> zipWithIndex().setName(predataUserName).persist(StorageLevel.MEMORY_AND_DISK_SER)
> val trainData = predataUser.flatMap(x => x._1._2.map(y => (x._2.toInt, y._1,
> y._2.toFloat)))
> .setName(trainDataName).persist(StorageLevel.MEMORY_AND_DISK_SER)case class
> ALSData(user:Int, item:Int, rating:Float) extends Serializable
> val ratingData = trainData.map(x => ALSData(x._1, x._2, x._3)).toDF()
> val als = new ALS
> val paramMap = ParamMap(als.alpha -> 25000).
> put(als.checkpointInterval, 5).
> put(als.implicitPrefs, true).
> put(als.itemCol, "item").
> put(als.maxIter, 60).
> put(als.nonnegative, false).
> put(als.numItemBlocks, 600).
> put(als.numUserBlocks, 600).
> put(als.regParam, 4.5).
> put(als.rank, 25).
> put(als.userCol, "user")
> als.fit(ratingData, paramMap){code}
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