stczwd commented on issue #23827: [SPARK-26912][CORE][HISTORY] Allow setting 
permission for event_log
URL: https://github.com/apache/spark/pull/23827#issuecomment-467676869
 
 
   "we used a history server as the history service". It means we have only one 
history server to support all of the spark applications. All user with 
different identifies will write event_log in same directory and use the same 
history server to check spark log.
   This is a normal scenario when using livy with different queues.

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