Github user sarutak commented on the pull request:

    https://github.com/apache/spark/pull/2342#issuecomment-95675268
  
    I almost addressed your feedbacks.
    
    > Using this vs the approach in #5547. I think a good answer here is to use 
this vis.js library for the jobs page and then use a custom D3-based approach 
for the stage page, where we need to be careful about scalability to thousands 
of events (e.g. thousands of tasks). So with that in mind, I'd propose removing 
the stage functionality for now from this patch and only having the other pages.
    
    O.K. I respect the approach in #5547 for the stage page.
    
    I'm pending following some feedbacks.
    
    > It would be good to have a visual line indicating the start of the 
application.
    
    Instead of a visual line, in current implementation, we cannot scroll 
before the time application started.
    
    > It would be nice if you could use +scroll to zoom, so that we could 
remove the scroll lock. Is this possible with the library?
    
    vis.js doesn't support that feature directly so we need something trick. 
I'll implement this feature when I get good idea.
    
    > It would be nice if I could mouse over a job and then have it highlight 
the corresponding job on the table below.
    
    Instead of this, when we click on event box on the timeline, we can move to 
the corresponding row in the jobs table.



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