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https://issues.apache.org/jira/browse/LUCENE-2893?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17236199#comment-17236199
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Erick Erickson commented on LUCENE-2893:
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[~rcmuir] Should we close this one too?
> index upgrade tool for /dev-tools
> ---------------------------------
>
> Key: LUCENE-2893
> URL: https://issues.apache.org/jira/browse/LUCENE-2893
> Project: Lucene - Core
> Issue Type: Task
> Reporter: Robert Muir
> Priority: Major
> Attachments: LUCENE-2893.patch
>
>
> we change the index format from time to time, and people tracking trunk have
> to re-index.
> I think we should put a (unsupported, scary) tool in /dev-tools that uses the
> PreflexRW Codec to
> serialize the index to a 3.0 index (with your old trunk version), you can
> then deserialize it back
> with the newer trunk version, to the newest StandardCodec.
> this won't prevent all reindexes, but would work for changes under codec
> control.
> mainly though, I think we could somehow add undeleteAll + this tool + apply
> deletes to prevent
> the painful reindexing of luceneutil benchmarking indexes :)
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