Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/916#discussion_r13209687
--- Diff: core/src/main/scala/org/apache/spark/rdd/RDD.scala ---
@@ -402,10 +411,11 @@ abstract class RDD[T: ClassTag](
}
if (num > initialCount && !withReplacement) {
+ // special case not covered in computeFraction
--- End diff --
If sample without replacement, `num` cannot be greater than initialCount.
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