Github user uncleGen commented on the issue:

    https://github.com/apache/spark/pull/16142
  
    @srowen Spark History Server may do the clean-up work. The precondition is 
we start it and it keeps running. Besides, if there are abundant applications 
constantly, the event log may still take up abundant storage space. This PR 
gives system another chance to clean-up work before each application begins 
saving event log. What's more, if you are more concerned with storage cost, 
this PR provides 'space' mode to restrict the disk usage of spark event log.
    
    > It's something you often leave to a cron job or something to archive and 
clean up.
    
    IMHO, I do not think it is a stable way to do this work. We may make sure 
it works and keeps working, just like Spark history server.


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