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https://issues.apache.org/jira/browse/LUCENE-6442?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Muir resolved LUCENE-6442.
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Resolution: Fixed
Fix Version/s: 5.2
Trunk
> 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
> Fix For: Trunk, 5.2
>
> 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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