Github user pwendell commented on a diff in the pull request:
https://github.com/apache/spark/pull/4074#discussion_r23129615
--- Diff: core/src/main/scala/org/apache/spark/api/java/JavaRDDLike.scala
---
@@ -436,6 +436,12 @@ trait JavaRDDLike[T, This <: JavaRDDLike[T, This]]
extends Serializable {
def first(): T = rdd.first()
/**
+ * @return true if and only if the RDD contains no elements at all. Note
that an RDD
+ * may be empty even when it has at least 1 partition.
+ */
+ def isEmpty(): Boolean = rdd.isEmpty()
--- End diff --
So this is actually a legitimate API break _if_ we think users are
themselves extending `JavaRDDLike` trait, because it will add a method to the
associated interface. One option is to just do it and ask users not to write
code that directly accepts or extends `JavaRDDLike`, and maybe we could
document that in the JavaDoc. Another option is just to add this to the
concrete implementations in JavaRDD and JavaPairRDD. @JoshRosen, any thoughts
one way or the other?
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