[GitHub] spark pull request: [SPARK-8702][WebUI]Avoid massive concating str...

[zsxwing]

Github user zsxwing commented on the pull request:

    https://github.com/apache/spark/pull/7082#issuecomment-116612731
  
    @sarutak I also find another issue in the console.
    
    Because `System.currentTimeMillis()` is not accurate for tasks that only 
need several milliseconds, sometimes `totalExecutionTime` in `makeTimeline` 
will be 0. If `totalExecutionTime` is 0, there will the following error in the 
console.
    
    ![screen shot 2015-06-29 at 7 08 55 
pm](https://cloud.githubusercontent.com/assets/1000778/8406776/5cd38e04-1e92-11e5-89f2-0c5134fe4b6b.png)
    



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