[jira] [Resolved] (LUCENE-4128) add safety to preflex segmentinfo "upgrade"

["Michael McCandless (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-4128?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael McCandless resolved LUCENE-4128.
----------------------------------------

    Resolution: Fixed
    
> 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, 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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