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Posted to dev@lucene.apache.org by "Ryan Ernst (JIRA)" <ji...@apache.org> on 2015/04/21 05:59:00 UTC
[jira] [Commented] (LUCENE-6442) Add a mockfs with unpredictable
but deterministic file listing order
[ https://issues.apache.org/jira/browse/LUCENE-6442?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14504274#comment-14504274 ]
Ryan Ernst commented on LUCENE-6442:
------------------------------------
+1, the mockfs test improvements are great.
> 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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