Github user koeninger commented on a diff in the pull request:

    https://github.com/apache/spark/pull/6632#discussion_r32872490
  
    --- 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)
    +    assert(rdd.take(1).size === 1)
    +    assert(messages(rdd.take(1).head._2))
    --- End diff --
    
    It's asserting that item taken from the rdd is a member of the set of
    messages sent
    
    On Fri, Jun 19, 2015 at 4:07 PM, Tathagata Das <notificati...@github.com>
    wrote:
    
    > In
    > 
external/kafka/src/test/scala/org/apache/spark/streaming/kafka/KafkaRDDSuite.scala
    > <https://github.com/apache/spark/pull/6632#discussion_r32869380>:
    >
    > > @@ -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)
    > > +    assert(rdd.take(1).size === 1)
    > > +    assert(messages(rdd.take(1).head._2))
    >
    > What does this check? Shouldnt it check that rdd.take(1) === "the" //
    > whatever is expected
    >
    > —
    > Reply to this email directly or view it on GitHub
    > <https://github.com/apache/spark/pull/6632/files#r32869380>.
    >



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