Github user witgo commented on a diff in the pull request: https://github.com/apache/spark/pull/44#discussion_r10370902 --- 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 -- In other words, all RDDs (including custom RDD ) have continuous index space. This condition is mandatory (now not verified).
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