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Date: Fri, 29 Oct 2010 09:02:24 -0400 (EDT)
From: "Uwe Schindler (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
Subject: [jira] Commented: (LUCENE-2675) Add support for 3.0 indexes in 2.9
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    [ https://issues.apache.org/jira/browse/LUCENE-2675?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12926260#action_12926260 ] 

Uwe Schindler commented on LUCENE-2675:
---------------------------------------

So as Robert seems to also agree, I think I commit this and modify changes.txt to explicitely say that thisonly applys to 2.9/3.0, as it uses same codebase and same bugfix level.

> Add support for 3.0 indexes in 2.9 branch
> -----------------------------------------
>
>                 Key: LUCENE-2675
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2675
>             Project: Lucene - Java
>          Issue Type: Improvement
>    Affects Versions: 2.9, 2.9.1, 2.9.2, 2.9.3
>            Reporter: Uwe Schindler
>            Assignee: Uwe Schindler
>            Priority: Minor
>             Fix For: 2.9.4
>
>         Attachments: index.30.cfs.zip, index.30.nocfs.zip, LUCENE-2675.patch
>
>
> There was a lot of user requests to be able to read Lucene 3.0 indexes also with 2.9. This would make the migration easier. There is no problem in doing that, as the new stored fields version in Lucene 3.0 is only used to mark a segment's stored fields file as no longer containing compressed fields. But index format did not really change. This patch simply allows FieldsReader to pass a Lucene 3.0 version number, but still writes segments in 2.9 format (as you could suddenly turn on compression for added documents).
> I added ZIP files for 3.0 indexes for TestBackwards. Without the patch it does not pass, as FieldsReader complains about incorrect version number (although it could read the file easily). If we would release maybe a 2.9.4 release of Lucene we should include that patch.

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