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https://issues.apache.org/jira/browse/LUCENE-2720?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shai Erera updated LUCENE-2720:
-------------------------------

    Attachment: LUCENE-2720-trunk.patch

Patch against trunk. I need to fix 3x to write the version and produce an index 
for TestBackCompat before committing this patch (even though the tests pass).

> IndexWriter should throw IndexFormatTooOldExc on open, not later during 
> optimize/getReader/close
> ------------------------------------------------------------------------------------------------
>
>                 Key: LUCENE-2720
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2720
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Index
>            Reporter: Michael McCandless
>             Fix For: 3.1, 4.0
>
>         Attachments: LUCENE-2720-trunk.patch
>
>
> Spinoff of LUCENE-2618 and also related to the original issue LUCENE-2523...
> If you open IW on a too-old index, you don't find out until much later that 
> the index is too old.
> This is because IW does not go and open segment readers on all segments.  It 
> only does so when it's time to apply deletes, do merges, open an NRT reader, 
> etc.
> This is a serious bug because you can in fact succeed in committing with the 
> new major version of Lucene against your too-old index, which is catastrophic 
> because suddenly the old Lucene version will no longer open the index, and so 
> your index becomes unusable.

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