Github user revans2 commented on a diff in the pull request:

    https://github.com/apache/storm/pull/448#discussion_r25521108
  
    --- Diff: 
storm-core/src/jvm/backtype/storm/security/auth/authorizer/SimpleACLAuthorizer.java
 ---
    @@ -50,6 +50,7 @@
         protected Set<String> _supervisors;
         protected IPrincipalToLocal _ptol;
         protected IGroupMappingServiceProvider _groupMappingProvider;
    +    protected ImpersonationAuthorizer _impersonationAuthorizer;
    --- End diff --
    
    I don't really like the idea of having all authorizers have to be updated 
to support the impersonation code.  I would much rather have the code spliced 
in at a much higher level that cannot be turned off.  Otherwise a custom 
IAuthorizer instance that does not know to update after this change is now wide 
open for anyone to impersonate anyone else.  The logging changes should also 
probably happen at the same level.


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