Github user witgo commented on a diff in the pull request:
https://github.com/apache/spark/pull/44#discussion_r10242185
--- 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 --
1. Can be changed
require(partitions.toSet.diff(rdd.partitions.map(_.index).toSet).isEmpty,
"partition index out of range")
2. Custom Partitioner causing a lot of problems
val partitioner = new Partitioner {
override def numPartitions: Int = 2
override def getPartition(key: Any): Int = key.hashCode() % 2
}
val pairs = sc.parallelize(Array((1, 2), (3, 4), (5, 6), (-1,
7)))
val shuffled = pairs.partitionBy(partitioner)
shuffled.count
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