Github user jerryshao commented on the pull request:
https://github.com/apache/spark/pull/557#issuecomment-50703510
I think the main reason is that some times when we feed our test data to
Kafka, the KafkaReceiver is still starting, after the receiver started, it will
ignore the previous sent data and read from the end of the queue (because of
the behavior Kafka 0.8's auto.offset.reset=largest), so previous sent test data
will never be consumed, and the test will be failed. So the simple way is to
sleep for several seconds after `ssc.start()` and then feed the data.
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