Github user andrewor14 commented on the pull request:

    https://github.com/apache/spark/pull/7399#issuecomment-122697156
  
    Hi @zsxwing I tried this out locally. It looks like there are a few 
usability issues:
    - When I put in page 111 / 100, I see the following, which is good. 
However, all the buttons are now missing, and I can't "select a page number 
between 1 and 100" as the error message suggested me to do.
    <img width="1190" alt="screen shot 2015-07-19 at 12 28 37 pm" 
src="https://cloud.githubusercontent.com/assets/2133137/8767442/e53e9282-2e11-11e5-9dc4-140854fb1da8.png";>
    - Also, if you look at the screenshot, there is no space between the error 
message and the bottom of the page. It would be good to add some padding there.
    - When I tried to increase the number of tasks shown per page, it gives me 
the above error message. For instance, I was previously on page 99 / 100, and 
then I increased the number of tasks displayed from 100 to 200, then I got an 
error telling me to select a number between 1 and 50. I think we should just 
clear the other variables (ordering, current page number etc.) when we change 
this variable.


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