Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/1025#discussion_r13578453
--- Diff: core/src/main/scala/org/apache/spark/rdd/PairRDDFunctions.scala
---
@@ -156,6 +161,182 @@ class PairRDDFunctions[K, V](self: RDD[(K, V)])
}
/**
+ * Return a subset of this RDD sampled by key (via stratified sampling).
+ * We guarantee a sample size = math.ceil(fraction * S_i), where S_i is
the size of the ith
--- End diff --
+ "with high probability"
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