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https://issues.apache.org/jira/browse/LUCENE-6431?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14499645#comment-14499645
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Robert Muir commented on LUCENE-6431:
-------------------------------------
I'm not worried about "randomness" of this thing at all. That's a false economy.
Reproducibility has to be number one. I'll commit this and anything else is
sugar-on-top.
> Make extrasfs reproducible
> --------------------------
>
> Key: LUCENE-6431
> URL: https://issues.apache.org/jira/browse/LUCENE-6431
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Robert Muir
> Attachments: LUCENE-6431.patch
>
>
> Today this is really bad, it can easily cause non-reproducible test failures.
> Its a per-class thing, but its decisions are based on previous events
> happening for that class (e.g. directory operations).
> Even using the filename can't work, its setup so early in the process, before
> test framework even ensures java.io.tempdir and similar exist. Even
> disregarding that, test files use a temp directory facility and those names
> are not reproducible (they depend on what already exists, e.g. from a
> previous test run).
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