Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/2455#discussion_r18423449
--- Diff:
core/src/main/scala/org/apache/spark/util/random/RandomSampler.scala ---
@@ -53,56 +89,238 @@ trait RandomSampler[T, U] extends Pseudorandom with
Cloneable with Serializable
* @tparam T item type
*/
@DeveloperApi
-class BernoulliSampler[T](lb: Double, ub: Double, complement: Boolean =
false)
+class BernoulliPartitionSampler[T](lb: Double, ub: Double, complement:
Boolean = false)
extends RandomSampler[T, T] {
- private[random] var rng: Random = new XORShiftRandom
+ /** epsilon slop to avoid failure from floating point jitter */
+ @transient val eps: Double = RandomSampler.epsArgs
+ require(lb <= (ub + eps), "Lower bound (lb) must be <= upper bound
(ub)")
--- End diff --
include the values of `lb` and `ub` in the message. remove the extra space
between `ub` and `+`
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