Github user CodingCat commented on a diff in the pull request:
https://github.com/apache/spark/pull/44#discussion_r10242393
--- 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 partitionRange = (0 until rdd.partitions.size)
+ require(partitions.forall(partitionRange.contains(_)), "partition
index out of range")
--- End diff --
even the PartitionPruningRDD ensures the continuous index space...I think
so...
```
class PruneDependency[T](rdd: RDD[T], @transient partitionFilterFunc: Int
=> Boolean)
extends NarrowDependency[T](rdd) {
@transient
val partitions: Array[Partition] = rdd.partitions
.filter(s => partitionFilterFunc(s.index)).zipWithIndex
.map { case(split, idx) => new PartitionPruningRDDPartition(idx, split)
: Partition }
override def getParents(partitionId: Int) = {
List(partitions(partitionId).asInstanceOf[PartitionPruningRDDPartition].parentSplit.index)
}
}
```
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