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https://issues.apache.org/jira/browse/HADOOP-15836?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16660697#comment-16660697
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BELUGA BEHR commented on HADOOP-15836:
--------------------------------------

As we've seen in the unit tests, this class is used to generate ACL strings:

bq. I think it might be more pleasant to a human operator if the list is 
ordered alphabetically.

I proposed this change for that reason.  Using a {{HashSet}}, the users and 
groups are seemingly randomly ordered, which is mildly confusing since this 
information is supplied trough a configuration.  The output string will likely 
not match the input string, so we can at least alphabetize it.  People will 
understand that ordering and it may be a little easier to troubleshoot. Thanks.

> Review of AccessControlList
> ---------------------------
>
>                 Key: HADOOP-15836
>                 URL: https://issues.apache.org/jira/browse/HADOOP-15836
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: common, security
>    Affects Versions: 3.2.0
>            Reporter: BELUGA BEHR
>            Assignee: BELUGA BEHR
>            Priority: Minor
>             Fix For: 3.3.0
>
>         Attachments: HADOOP-15836.1.patch
>
>
> * Improve unit tests (expected / actual were backwards)
> * Unit test expected elements to be in order but the class's return 
> Collections were unordered
> * Formatting cleanup
> * Removed superfluous white space
> * Remove use of LinkedList
> * Removed superfluous code
> * Use {{unmodifiable}} Collections where JavaDoc states that caller must not 
> manipulate the data structure



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