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https://issues.apache.org/jira/browse/HADOOP-16847?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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testfixer0 updated HADOOP-16847:
--------------------------------
    Description: 
The method `testNegativeGroupCaching` in `TestGroupsCaching` can fail if the 
iteration order of HashSet changes. In detail, in line 331, the method 
`assertEquals` compare `groups.getGroups(user)` with a ArrayList `myGroups` . 
However,  `groups.getGroups(user)` is related with  `FakeGroupMapping`. The 
variables `allGroups` and `blackList` are defined as HashSet in 
`FakeGroupMapping`, and it can iterate in a different order.

This PR proposes to modify HashSet to LinkedHashSet for a deterministic order.

  was:The method `testNegativeGroupCaching` can fail if the iteration order of 
HashSet changes. So, this PR proposes to modify HashSet to LinkedHashSet for a 
deterministic order


> Test can fail if HashSet iterates in a different order
> ------------------------------------------------------
>
>                 Key: HADOOP-16847
>                 URL: https://issues.apache.org/jira/browse/HADOOP-16847
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: security
>    Affects Versions: 3.2.1
>            Reporter: testfixer0
>            Priority: Minor
>         Attachments: HADOOP-16847-000.patch, HADOOP-16847-000.patch
>
>
> The method `testNegativeGroupCaching` in `TestGroupsCaching` can fail if the 
> iteration order of HashSet changes. In detail, in line 331, the method 
> `assertEquals` compare `groups.getGroups(user)` with a ArrayList `myGroups` . 
> However,  `groups.getGroups(user)` is related with  `FakeGroupMapping`. The 
> variables `allGroups` and `blackList` are defined as HashSet in 
> `FakeGroupMapping`, and it can iterate in a different order.
> This PR proposes to modify HashSet to LinkedHashSet for a deterministic order.



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