Github user jerryshao commented on the pull request:

    https://github.com/apache/spark/pull/4961#issuecomment-91084075
  
    Hi @JoshRosen , thanks a lot for your review.
    
     I think I just removed this `Thread.sleep(2000)`, from my local test seems 
this sleep is not necessary, and currently there's no better solution like 
`eventually` to wait for the start of Kafka broker. So here I just simply 
remove this `Thread.sleep(2000)`. I'm not sure if there's any problem with 
Jenkins, since it has more overhead compared to my local test. Maybe we could 
resolve this later when this problem exists.


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