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https://issues.apache.org/jira/browse/LUCENE-6442?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14504819#comment-14504819
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ASF subversion and git services commented on LUCENE-6442:
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Commit 1675098 from [~rcmuir] in branch 'dev/branches/branch_5x'
[ https://svn.apache.org/r1675098 ]
LUCENE-6442: Add mockfs with unpredictable but deterministic file listing order
> Add a mockfs with unpredictable but deterministic file listing order
> --------------------------------------------------------------------
>
> Key: LUCENE-6442
> URL: https://issues.apache.org/jira/browse/LUCENE-6442
> Project: Lucene - Core
> Issue Type: Task
> Reporter: Robert Muir
> Attachments: LUCENE-6442.patch
>
>
> Any test that processes with directory listing apis (Directory.listAll(),
> DirectoryStream, walkFileTree, etc) and does not sort the results can cause
> reproducibility difficulties, because it might e.g. consume from random() in
> a different order and so on.
> We can instead sort and shuffle in a predictable way per-class based on the
> random seed.
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