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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (LUCENE-6442) Add a mockfs with unpredictable but deterministic file listing order
Date Tue, 21 Apr 2015 11:42:59 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-6442?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Robert Muir resolved LUCENE-6442.
---------------------------------
       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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