Github user CodingCat commented on a diff in the pull request:
https://github.com/apache/spark/pull/44#discussion_r10243399
--- Diff: core/src/main/scala/org/apache/spark/SparkContext.scala ---
@@ -847,6 +847,7 @@ class SparkContext(
partitions: Seq[Int],
allowLocal: Boolean,
resultHandler: (Int, U) => Unit) {
+
require(partitions.toSet.diff(rdd.partitions.map(_.index).toSet).isEmpty,
"partition index out of range")
--- End diff --
```
/**
* Get the array of partitions of this RDD, taking into account whether
the
* RDD is checkpointed or not.
*/
final def partitions: Array[Partition] = {
checkpointRDD.map(_.partitions).getOrElse {
if (partitions_ == null) {
partitions_ = getPartitions
}
partitions_
}
}
```
RDD.partitions is actually determined by subclass implementation
(getPartitions)...
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