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https://issues.apache.org/jira/browse/LUCENE-5896?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14104434#comment-14104434
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Dawid Weiss commented on LUCENE-5896:
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So, to be clear -- I think this is the problem:
{code}
public static IndexWriterConfig newIndexWriterConfig(Random r, Analyzer a) {
{code}
It should just use the randomized context's randomness consistently instead of
accepting an external Random. It would be consistent (and is not leading to any
thread related randomization races).
> A few potential reproducible issues
> -----------------------------------
>
> Key: LUCENE-5896
> URL: https://issues.apache.org/jira/browse/LUCENE-5896
> Project: Lucene - Core
> Issue Type: Test
> Components: general/test
> Affects Versions: 4.9
> Reporter: Simon Willnauer
> Fix For: 5.0, 4.10
>
> Attachments: LUCENE-5896.patch
>
>
> I realized that passing the same seeded random instance to LuceneTestCase#
> newIndewWriterConfig doesn't necessarily produce the same IWC and I found a
> bunch of issues in that class using global random rather than local random.
> Yet, I went over the file to spot others but we might need to think about a
> more automated way to spot those...
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