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Posted to issues@spark.apache.org by "Sean Owen (JIRA)" <ji...@apache.org> on 2018/07/16 14:53:00 UTC
[jira] [Resolved] (SPARK-18230)
MatrixFactorizationModel.recommendProducts throws NoSuchElement exception
when the user does not exist
[ https://issues.apache.org/jira/browse/SPARK-18230?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Sean Owen resolved SPARK-18230.
-------------------------------
Resolution: Fixed
Fix Version/s: 2.4.0
Issue resolved by pull request 21740
[https://github.com/apache/spark/pull/21740]
> MatrixFactorizationModel.recommendProducts throws NoSuchElement exception when the user does not exist
> ------------------------------------------------------------------------------------------------------
>
> Key: SPARK-18230
> URL: https://issues.apache.org/jira/browse/SPARK-18230
> Project: Spark
> Issue Type: Improvement
> Components: MLlib
> Affects Versions: 2.0.1
> Reporter: Mikael Ståldal
> Assignee: shahid
> Priority: Minor
> Fix For: 2.4.0
>
>
> When invoking {{MatrixFactorizationModel.recommendProducts(Int, Int)}} with a non-existing user, a {{java.util.NoSuchElementException}} is thrown:
> {code}
> java.util.NoSuchElementException: next on empty iterator
> at scala.collection.Iterator$$anon$2.next(Iterator.scala:39)
> at scala.collection.Iterator$$anon$2.next(Iterator.scala:37)
> at scala.collection.IndexedSeqLike$Elements.next(IndexedSeqLike.scala:63)
> at scala.collection.IterableLike$class.head(IterableLike.scala:107)
> at scala.collection.mutable.WrappedArray.scala$collection$IndexedSeqOptimized$$super$head(WrappedArray.scala:35)
> at scala.collection.IndexedSeqOptimized$class.head(IndexedSeqOptimized.scala:126)
> at scala.collection.mutable.WrappedArray.head(WrappedArray.scala:35)
> at org.apache.spark.mllib.recommendation.MatrixFactorizationModel.recommendProducts(MatrixFactorizationModel.scala:169)
> {code}
> It would be nice if it returned the empty array, or throwed a more specific exception, and that was documented in ScalaDoc for the method.
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