Github user JoshRosen commented on the pull request:

    https://github.com/apache/spark/pull/9860#issuecomment-159182921
  
    I worry that this opens a can of UI / UX worms for very little net benefit 
to users. For instance, a common complaint with the Jenkins auto-refresh is 
that the delay is not configurable, leading to the development of Jenkins 
plugins to add options for controlling the timeout: 
https://wiki.jenkins-ci.org/display/JENKINS/Config+AutoRefresh+Plugin; I 
imagine we'd run into similar complains / feature requests as soon as we added 
this. The net benefit to users seems tiny if we're not going to do in-place 
updating without the page refresh, so I'm personally against adding this UI 
clutter.
    
    (By the way, whether we do push vs. pull is slightly orthogonal to updating 
the view contents without refreshing the whole page; for example, spark-prs' 
in-place refresh is entirely pull-based; this is a larger discussion which 
belongs on JIRA, though).


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