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https://issues.apache.org/jira/browse/HADOOP-16847?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17034365#comment-17034365
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Hudson commented on HADOOP-16847:
---------------------------------
SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #17937 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/17937/])
HADOOP-16847. Test can fail if HashSet iterates in a different order. (github:
rev d36cd37e606e03b4c2b7b25b9155fc5ec5dc379d)
* (edit)
hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/security/TestGroupsCaching.java
> Test TestGroupsCaching 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: test
> Affects Versions: 3.2.1
> Reporter: testfixer0
> Assignee: testfixer0
> Priority: Minor
> Fix For: 3.3.0, 3.2.2
>
> Attachments: HADOOP-16847-000.patch, HADOOP-16847-000.patch,
> HADOOP-16874-001.patch
>
>
> The test `testNegativeGroupCaching` can fail if the iteration order of
> HashSet changes. In detail, the method `assertEquals` (line 331) compares
> `groups.getGroups(user)` with an ArrayList `myGroups`. The method `getGroups`
> converts `allGroups` (a HashSet) to a list and it calls iterator in HashSet.
> However, the iteration is non-deterministic.
> This PR proposes to modify HashSet to LinkedHashSet for a deterministic order.
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