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https://issues.apache.org/jira/browse/LUCENE-3082?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Uwe Schindler resolved LUCENE-3082.
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Resolution: Fixed
Committed trunk revision: 1101088
Committed 3.x revision: 1101093
> Add tool to upgrade all segments of an index to last recent supported index
> format without optimizing
> -----------------------------------------------------------------------------------------------------
>
> Key: LUCENE-3082
> URL: https://issues.apache.org/jira/browse/LUCENE-3082
> Project: Lucene - Java
> Issue Type: New Feature
> Components: Index
> Reporter: Uwe Schindler
> Assignee: Uwe Schindler
> Priority: Minor
> Fix For: 3.2, 4.0
>
> Attachments: LUCENE-3082.patch, LUCENE-3082.patch, LUCENE-3082.patch,
> LUCENE-3082.patch, LUCENE-3082.patch, index.31.optimized.cfs.zip,
> index.31.optimized.nocfs.zip
>
>
> Currently if you want to upgrade an old index to the format of your current
> Lucene version, you have to optimize your index or use
> addIndexes(IndexReader...) [see LUCENE-2893] to copy to a new directory. The
> optimize() approach fails if your index is already optimized.
> I propose to add a custom MergePolicy to upgrade all segments to the last
> format. This MergePolicy could simply also ignore all segments already
> up-to-date. All segments in prior formats would be merged to a new segment
> using another MergePolicy's optimize strategy.
> This issue is different from LUCENE-2893, as it would only support upgrading
> indexes from previous Lucene versions in-place using the official path. Its a
> tool for the end user, not a developer tool.
> This addition should also go to Lucene 3.x, as we need to make users with
> pre-3.0 indexes go the step through 3.x, else they would not be able to open
> their index with 4.0. With this tool in 3.x the users could safely upgrade
> their index without relying on optimize to work on already-optimized indexes.
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