Github user dongjoon-hyun commented on a diff in the pull request: https://github.com/apache/spark/pull/13260#discussion_r64337410 --- Diff: core/src/main/scala/org/apache/spark/rdd/RDD.scala --- @@ -550,17 +550,19 @@ abstract class RDD[T: ClassTag]( } else { val fraction = SamplingUtils.computeFractionForSampleSize(num, initialCount, withReplacement) - var samples = this.sample(withReplacement, fraction, rand.nextInt()).collect() + var samples = this.sample(withReplacement, fraction, rand.nextInt()) + var count = samples.count() // If the first sample didn't turn out large enough, keep trying to take samples; // this shouldn't happen often because we use a big multiplier for the initial size var numIters = 0 - while (samples.length < num) { + while (count < num) { logWarning(s"Needed to re-sample due to insufficient sample size. Repeat #$numIters") - samples = this.sample(withReplacement, fraction, rand.nextInt()).collect() + samples = this.sample(withReplacement, fraction, rand.nextInt()) + count = samples.count() numIters += 1 --- End diff -- Thank you, @hvanhovell !
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