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https://issues.apache.org/jira/browse/SPARK-2331?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Patrick Wendell resolved SPARK-2331.
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Resolution: Won't Fix
> SparkContext.emptyRDD has wrong return type
> -------------------------------------------
>
> Key: SPARK-2331
> URL: https://issues.apache.org/jira/browse/SPARK-2331
> Project: Spark
> Issue Type: Bug
> Affects Versions: 1.0.0
> Reporter: Ian Hummel
>
> 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)
> val rdds = Seq("a", "b", "c").foldLeft[RDD[String]](sc.emptyRDD[String]) {
> (rdd, path) ⇒
> rdd.union(sc.textFile(path))
> }
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