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[SPARK-10575][Spark Core]Wrapped RDD.takeSample with Scope #8730

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vinodkc wants to merge 8 commits into from
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[SPARK-10575][Spark Core]Wrapped RDD.takeSample with Scope #8730

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cf2c466
wrapped in scope
vinodkc Sep 12, 2015
c82b4f9
Added assert instead of IAE
vinodkc Sep 13, 2015
afe9396
fixed condition
vinodkc Sep 13, 2015
c06c6e5
Removed space
vinodkc Sep 13, 2015
7fa497d
Update RDD.scala
vinodkc Sep 15, 2015
b37778e
Fixed Review Comment
vinodkc Sep 15, 2015
4e6ce62
Update RDD.scala
vinodkc Sep 15, 2015
70de2b4
Handled review comments
Sep 15, 2015
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Fixed Review Comment
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@vinodkc
vinodkc committed Sep 15, 2015
commit b37778e24a8424f023f7625872157f6049cba459
5 changes: 3 additions & 2 deletions core/src/main/scala/org/apache/spark/rdd/RDD.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -480,10 +480,11 @@ abstract class RDD[T: ClassTag](
"Cannot support a sample size > Int.MaxValue - " +
s"$numStDev * math.sqrt(Int.MaxValue)")

val initialCount = this.count()
if (num == 0 || initialCount == 0) {

if (num == 0 || this.count() == 0) {
new Array[T](0)
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@andrewor14 andrewor14 Sep 14, 2015

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Hm, the only difference here is that if num == 0 we still do a count(), whereas before we just return quickly. I think we should preserve the old behavior even though it adds another layer of nesting and unfortunately makes the code harder to read.

} else {
val initialCount = this.count()
val rand = new Random(seed)
if (!withReplacement && num >= initialCount) {
Utils.randomizeInPlace(this.collect(), rand)
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