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

    https://github.com/apache/spark/pull/10089#discussion_r47289494
  
    --- Diff: 
external/kafka/src/test/scala/org/apache/spark/streaming/kafka/DirectKafkaStreamSuite.scala
 ---
    @@ -364,8 +365,8 @@ class DirectKafkaStreamSuite
     
         val batchIntervalMilliseconds = 100
         val estimator = new ConstantEstimator(100)
    -    val messageKeys = (1 to 200).map(_.toString)
    -    val messages = messageKeys.map((_, 1)).toMap
    +    val messages = Map("foo" -> 200)
    +    kafkaTestUtils.sendMessages(topic, messages)
    --- End diff --
    
    Oh yah only for testing - this was in response to switching the test to all 
messages on a single partition (which seemed limiting for testing code which 
changes us to handling each partitions back pressure instead of a single 
global).


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