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

    https://github.com/apache/storm/pull/445#discussion_r26266419
  
    --- Diff: 
storm-core/src/jvm/backtype/storm/security/auth/authorizer/SimpleACLAuthorizer.java
 ---
    @@ -96,7 +101,10 @@ public boolean permit(ReqContext context, String 
operation, Map topology_conf) {
             }
     
             if (_userCommands.contains(operation)) {
    -            return true;
    +            if (_nimbusUsers.size() > 0 && _nimbusUsers.contains(user))
    +                return true;
    +            else if (_nimbusUsers.size() == 0)
    +                return true;
    --- End diff --
    
    I personally think 
    ```
    return _nimbusUsers.size() == 0 || _nimbusUsers.contains(user);
    ```
    is more readable than what is here, but this is really minor.


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