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https://issues.apache.org/jira/browse/LUCENE-6843?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14963094#comment-14963094
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Michael McCandless commented on LUCENE-6843:
--------------------------------------------
Argh! Woops :) Thanks and sorry [~jpountz] and [~steve_rowe].
> RAMDirectory.listAll() sometimes returns null files
> ---------------------------------------------------
>
> Key: LUCENE-6843
> URL: https://issues.apache.org/jira/browse/LUCENE-6843
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Adrien Grand
> Attachments: LUCENE-6843.patch
>
>
> RAMDirectory was changed in LUCENE-6829 in a way that looks harmless but
> actually it can lead to RAMDirectory returning null files when
> Directory.listAll() is called if some files are deleted concurrently with
> file listing.
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