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https://issues.apache.org/jira/browse/LUCENE-4128?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13292770#comment-13292770
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Michael McCandless commented on LUCENE-4128:
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Good idea, I'll do that!
> add safety to preflex segmentinfo "upgrade"
> -------------------------------------------
>
> Key: LUCENE-4128
> URL: https://issues.apache.org/jira/browse/LUCENE-4128
> Project: Lucene - Java
> Issue Type: Bug
> Affects Versions: 4.0
> Reporter: Robert Muir
> Assignee: Michael McCandless
> Fix For: 4.0
>
> Attachments: LUCENE-4128.patch
>
>
> Currently the one-time-upgrade depends on whether the upgraded .si file
> exists. And the writing is done in a try/finally so its removed if
> ioexception happens.
> but I think there could be a power-loss or something else in the middle of
> this, the upgraded .si file could be bogus, then the user would have to
> manually remove it (they probably wouldnt know).
> i think instead we should just have a marker file on completion, that we
> create after we successfully fsync the upgraded .si file. this way if
> something happens we just rewrite the thing.
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