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https://issues.apache.org/jira/browse/LUCENE-2583?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Erick Erickson reopened LUCENE-2583:
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> Transparent chunk transformation (compression) of index directory
> -----------------------------------------------------------------
>
> Key: LUCENE-2583
> URL: https://issues.apache.org/jira/browse/LUCENE-2583
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/store
> Affects Versions: 2.4.1, 2.9, 2.9.1, 2.9.2, 2.9.3, 3.0, 3.0.1, 3.0.2
> Reporter: Mitja Lenič
> Priority: Minor
>
> In some cases user is willing to sacrifice speed for space efficiency or
> better data security. I've developed driver for Directory that enables
> transparent compression (any transformation) of directory files, by using
> decorator pattern. With current experience, compression ratios are between
> 1:5 to 1:10, which depends on type of data stored in index.
> Directory files are sliced into fixed chunks, each chunk separately
> transformed (eg. compressed, encrypted, ...) and written to supporting
> (nested) directory for storage.
> I've create project page at [http://code.google.com/p/lucenetransform/] and
> am also prepared to join contrib/store.
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