Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/5491#issuecomment-92555754
> where the app itself would explicitly keep the log's mod time updated
All I mean here is that `EventLoggingListener` could from time to time just
call `FileSystem.setTimes()` on the underlying log to make it look like it's
up-to-date. That way the HS won't clean up files if the application is really
alive. I'm not sure, though, whether HDFS allows you to do that while you have
an open file handle.
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