Github user lvdongr commented on the issue:

    https://github.com/apache/spark/pull/18987
  
    The log level setting is a very useful function.Our team is doing a spark 
application and  when we want to see the debug log, we have to restart the 
application every time. So we develop this function. 
    The complexity lays on the ui display and set the log level. But we can 
choose not to show the setting Button on UI, and just give a api or restful 
interface for user to access this function.Then the change on spark is no much.
    And Storm (http://storm.apache.org/) has the same function,too. @srowen 
@jerryshao @ajbozarth 


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