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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:
--------------------------------------------

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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