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https://issues.apache.org/jira/browse/SPARK-2331?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14376495#comment-14376495
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Patrick Wendell commented on SPARK-2331:
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By the way - [~rxin] recently pointed out to me that EmptyRDD is private[spark].
https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/rdd/EmptyRDD.scala#L27
Given that I'm sort of confused how people were using it before. I'm not
totally sure how making a class private[spark] affects its use in a return type.
> SparkContext.emptyRDD should return RDD[T] not EmptyRDD[T]
> ----------------------------------------------------------
>
> Key: SPARK-2331
> URL: https://issues.apache.org/jira/browse/SPARK-2331
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 1.0.0
> Reporter: Ian Hummel
> Priority: Minor
>
> The return type for SparkContext.emptyRDD is EmptyRDD[T].
> It should be RDD[T]. That means you have to add extra type annotations on
> code like the below (which creates a union of RDDs over some subset of paths
> in a folder)
> {code}
> val rdds = Seq("a", "b", "c").foldLeft[RDD[String]](sc.emptyRDD[String]) {
> (rdd, path) ⇒
> rdd.union(sc.textFile(path))
> }
> {code}
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