Github user ksakellis commented on the pull request:

    https://github.com/apache/spark/pull/4067#issuecomment-70220867
  
    ![screen shot 2015-01-16 at 12 04 04 
am](https://cloud.githubusercontent.com/assets/6590087/5773199/bcd70ffc-9d13-11e4-86c1-7140a73f9e92.png)
    Shows a stage that has Input Metrics (reading from a file) and writes data 
for next stage.
    
    ![screen shot 2015-01-16 at 12 04 15 
am](https://cloud.githubusercontent.com/assets/6590087/5773207/e252d90a-9d13-11e4-86d6-d1e77500785c.png)
    Shows a stage that has both shuffle reading and writing - no input or 
output metrics.
    
    ![screen shot 2015-01-16 at 12 04 25 
am](https://cloud.githubusercontent.com/assets/6590087/5773215/048fdef0-9d14-11e4-877f-229922bfe967.png)
    Shows a stage that has outputting to a file.


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