Github user pwendell commented on a diff in the pull request:

    https://github.com/apache/spark/pull/44#discussion_r10370952
  
    --- Diff: core/src/main/scala/org/apache/spark/SparkContext.scala ---
    @@ -847,6 +847,8 @@ class SparkContext(
           partitions: Seq[Int],
           allowLocal: Boolean,
           resultHandler: (Int, U) => Unit) {
    +    val outIndex = partitions.toSet.diff(rdd.partitions.map(_.index).toSet)
    --- End diff --
    
    I believe we assume it's continuous in other parts of the code. Basically 
if an rdd has X partitions then it has partition labels 0 to X-1.


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