Github user kanzhang commented on a diff in the pull request:
https://github.com/apache/spark/pull/776#discussion_r12704287
--- Diff:
core/src/main/scala/org/apache/spark/rdd/ParallelCollectionRDD.scala ---
@@ -128,18 +137,17 @@ private object ParallelCollectionRDD {
r.start, r.end + sign, r.step).asInstanceOf[Seq[T]], numSlices)
}
case r: Range => {
- (0 until numSlices).map(i => {
- val start = ((i * r.length.toLong) / numSlices).toInt
- val end = (((i + 1) * r.length.toLong) / numSlices).toInt
- new Range(r.start + start * r.step, r.start + end * r.step,
r.step)
+ positions(r.length, numSlices).map({
+ case (start, end) =>
+ new Range(r.start + start * r.step, r.start + end * r.step,
r.step)
}).asInstanceOf[Seq[Seq[T]]]
}
case nr: NumericRange[_] => {
// For ranges of Long, Double, BigInteger, etc
val slices = new ArrayBuffer[Seq[T]](numSlices)
- val sliceSize = (nr.size + numSlices - 1) / numSlices // Round up
to catch everything
var r = nr
- for (i <- 0 until numSlices) {
+ for ((start, end) <- positions(nr.length, numSlices)) {
+ val sliceSize = end - start
slices += r.take(sliceSize).asInstanceOf[Seq[T]]
--- End diff --
Looks like a bug to me. I couldn't google any pointer on it. You might want
to post it on Scala forum?
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