Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/509#issuecomment-41337925
As discussed offline with @pwendell and @tgravescs we will have a
`spark.history.acls.enabled`. If set to true, this will enforce ACLs on all
applications. If the original application specified their own
`spark.ui.acls.views`, we will honor them, otherwise we will impose the default
restriction that only the user of the application can see it. If set to false,
we will turn off ACLs for all applications, regardless of their original
configuration.
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