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https://issues.apache.org/jira/browse/SPARK-13815?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15198261#comment-15198261
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Apache Spark commented on SPARK-13815:
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User 'joan38' has created a pull request for this issue:
https://github.com/apache/spark/pull/11772
> Provide better Exception messages in Pipeline load methods
> ----------------------------------------------------------
>
> Key: SPARK-13815
> URL: https://issues.apache.org/jira/browse/SPARK-13815
> Project: Spark
> Issue Type: Improvement
> Components: MLlib
> Affects Versions: 2.0.0
> Environment: today's build of 2.0.0-SNAPSHOT
> Reporter: Jacek Laskowski
> Priority: Minor
>
> The following code that loads a {{Pipeline}} from an empty {{metadata}} file
> throws an exception (expected) that says nothing about the real cause of it.
> {code}
> $ ls -l hello-pipeline/metadata
> -rw-r--r-- 1 jacek staff 0 11 mar 09:00 hello-pipeline/metadata
> scala> Pipeline.read.load("hello-pipeline")
> ...
> java.lang.UnsupportedOperationException: empty collection
> at org.apache.spark.rdd.RDD$$anonfun$first$1.apply(RDD.scala:1344)
> at
> org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:150)
> at
> org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:111)
> at org.apache.spark.rdd.RDD.withScope(RDD.scala:316)
> at org.apache.spark.rdd.RDD.first(RDD.scala:1341)
> at
> org.apache.spark.ml.util.DefaultParamsReader$.loadMetadata(ReadWrite.scala:285)
> at
> org.apache.spark.ml.Pipeline$SharedReadWrite$.load(Pipeline.scala:253)
> at
> org.apache.spark.ml.Pipeline$PipelineReader.load(Pipeline.scala:203)
> at
> org.apache.spark.ml.Pipeline$PipelineReader.load(Pipeline.scala:197)
> {code}
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