Github user mateiz commented on a diff in the pull request:
https://github.com/apache/spark/pull/776#discussion_r13269334
--- Diff:
core/src/main/scala/org/apache/spark/rdd/ParallelCollectionRDD.scala ---
@@ -117,6 +117,15 @@ private object ParallelCollectionRDD {
if (numSlices < 1) {
throw new IllegalArgumentException("Positive number of slices
required")
}
+ // Sequences need to be sliced at same positions for operations
+ // like RDD.zip() to behave as expected
+ def positions(length: Long, numSlices: Int) = {
--- End diff --
Actually it would be better if this returned an Iterator, so that it
doesn't materialize the whole sequence. You can do `(0 until
numSlices).iterator.map(...)`.
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