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https://issues.apache.org/jira/browse/LUCENE-3658?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael McCandless resolved LUCENE-3658.
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Resolution: Fixed
> NRTCachingDir has invalid asserts (if same file name is written twice)
> ----------------------------------------------------------------------
>
> Key: LUCENE-3658
> URL: https://issues.apache.org/jira/browse/LUCENE-3658
> Project: Lucene - Java
> Issue Type: Bug
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: 3.6, 4.0
>
> Attachments: LUCENE-3658.patch
>
>
> Normally Lucene is write-once (except for segments.gen file, which
> NRTCachingDir never caches), but in some tests (TestDoc, TestCrash) we can
> write the same file more than once.
> I don't think NRTCachingDir should have these asserts, and I think on
> createOutput it should remove any old file if present.
> I also found & fixed a possible concurrency issue (if more than one thread
> syncs at the same time; IndexWriter doesn't ever do this today but it has in
> the past).
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