Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/6632#discussion_r32869403
--- Diff:
external/kafka/src/test/scala/org/apache/spark/streaming/kafka/KafkaRDDSuite.scala
---
@@ -68,6 +68,21 @@ class KafkaRDDSuite extends SparkFunSuite with
BeforeAndAfterAll {
val received = rdd.map(_._2).collect.toSet
assert(received === messages)
+
+ // size-related method optimizations return sane results
+ assert(rdd.count === messages.size)
+ assert(rdd.countApprox(0).getFinalValue.mean === messages.size)
+ assert(! rdd.isEmpty)
--- End diff --
There is not check whether isEmpty is successful.
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