Github user zsxwing commented on the pull request:

    https://github.com/apache/spark/pull/6004#issuecomment-100303947
  
    I just tried this PR. But it looks not work. 
    
    Test codes:
    ```Scala
        sc.setCheckpointDir(".")
        val r1 = sc.parallelize(1 to 100)
        r1.checkpoint()
        r1.map(_ + 2).filter(_ < 50).collect()
        r1.map(_ + 2).filter(_ < 50).collect()
    ```
    
    I opened the spark shell and typed the above codes. And the dag of job 2 is 
    ![screen shot 2015-05-08 at 10 24 14 
am](https://cloud.githubusercontent.com/assets/1000778/7541750/6ff09634-f56c-11e4-8ca6-b0c84fa3654d.png)
    
    The first one is still `collect`.
    



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