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https://issues.apache.org/jira/browse/LUCENE-3452?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13113721#comment-13113721
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Dawid Weiss commented on LUCENE-3452:
-------------------------------------
Yep, I was seconds ahead of your post, so I didn't see it :)
> The native FS lock used in test-framework's
> o.a.l.util.LuceneJUnitResultFormatter prohibits testing on a multi-user system
> --------------------------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-3452
> URL: https://issues.apache.org/jira/browse/LUCENE-3452
> Project: Lucene - Java
> Issue Type: Bug
> Components: general/test
> Affects Versions: 3.4, 4.0
> Reporter: Steven Rowe
> Priority: Minor
>
> {{LuceneJUnitResultFormatter}} uses a lock to buffer test suites' output, so
> that when run in parallel, they don't interrupt each other when they are
> displayed on the console.
> The current implementation uses a fixed directory ({{lucene_junit_lock/}} in
> {{java.io.tmpdir}} (by default {{/tmp/}} on Unix/Linux systems) as the
> location of this lock. This functionality was introduced on SOLR-1835.
> As Shawn Heisey reported on SOLR-2739, some tests fail when run as root, but
> succeed when run as a non-root user.
> On #lucene IRC today, Shawn wrote:
> {quote}
> (2:06:07 PM) elyograg: Now that I know I can't run the tests as root, I have
> discovered /tmp/lucene_junit_lock. Once you run the tests as user A, you
> cannot run them again as user B until that directory is deleted, and only
> root or the original user can do so.
> {quote}
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