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https://issues.apache.org/jira/browse/LUCENE-6213?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ryan Ernst updated LUCENE-6213:
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Attachment: unsupported.4x-with-3x-segments.zip
LUCENE-6213.patch
Here is a quick and dirty patch (against branch_5x) that adds a bwc index test
as you suggested, and a quick fix for the bug. I like the idea of a dummy
codec, but didn't have time to try it.
> Add test for IndexFormatTooOldException if a commit has a 3.x segment
> ---------------------------------------------------------------------
>
> Key: LUCENE-6213
> URL: https://issues.apache.org/jira/browse/LUCENE-6213
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Robert Muir
> Attachments: LUCENE-6213.patch, unsupported.4x-with-3x-segments.zip
>
>
> We should add a 4.x index (4.x commit) with some 3.x segment(s) to our
> backwards tests.
> I don't think we throw IndexFormatTooOldException correctly in this case. I
> think instead the user will get a confusing SPI error about a missing codec
> "Lucene3x".
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