Mikael Ståldal created SPARK-18230:
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Summary: 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: Bug
Components: MLlib
Affects Versions: 2.0.1
Reporter: Mikael Ståldal
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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