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https://issues.apache.org/jira/browse/LUCENE-3100?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13034642#comment-13034642
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Michael McCandless commented on LUCENE-3100:
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Patch looks good Simon!
> IW.commit() writes but fails to fsync the N.fnx file
> ----------------------------------------------------
>
> Key: LUCENE-3100
> URL: https://issues.apache.org/jira/browse/LUCENE-3100
> Project: Lucene - Java
> Issue Type: Bug
> Reporter: Michael McCandless
> Assignee: Simon Willnauer
> Fix For: 4.0
>
> Attachments: LUCENE-3100.patch
>
>
> In making a unit test for NRTCachingDir (LUCENE-3092) I hit this surprising
> bug!
> Because the new N.fnx file is written at the "last minute" along with the
> segments file, it's not included in the sis.files() that IW uses to figure
> out which files to sync.
> This bug means one could call IW.commit(), successfully, return, and then the
> machine could crash and when it comes back up your index could be corrupted.
> We should hopefully first fix TestCrash so that it hits this bug (maybe it
> needs more/better randomization?), then fix the bug....
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