Github user pwendell commented on a diff in the pull request:
https://github.com/apache/spark/pull/44#discussion_r10192944
--- 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 rddPartitions = rdd.partitions.map(_.index)
+ require(partitions.forall(rddPartitions.contains(_)), "partition index
out of range")
--- End diff --
Do you mind explaining a bit more the case where these two will not match?
I'm just wondering if it make more sense to check this invariant inside of the
`getPartitions` function of `ShuffleRDD.scala` - but maybe there are other code
paths where this could get messed up that don't go through that.
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