Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/1025#discussion_r14907544
--- Diff: core/src/main/scala/org/apache/spark/rdd/PairRDDFunctions.scala
---
@@ -195,6 +193,37 @@ class PairRDDFunctions[K, V](self: RDD[(K, V)])
}
/**
+ * Return a subset of this RDD sampled by key (via stratified sampling).
+ *
+ * If exact set to true, we guarantee, with high probability, a sample
size =
--- End diff --
The first sentence should provide a summary and the following paragraph
should expand this first sentence if some terms there are not well-defined,
e.g., `sample by key` in this case.
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