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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-2720-3x.patch
Patch against 3x:
* Adds FieldsReader.detectCodeVersion - returns "2.x" for pre-3.0 indexes and
"3.0" for 3.0 indexes. Not called for 3.1+ segments.
* SegmentInfo records its code version (Constants.LUCENE_MAIN_VERSION).
* SegmentInfos bumps up the format number and upgrades old segments ("2.x" or
"3.0") to record their version too.
I'll update the trunk patch to reflect those changes (i.e., now indexes touched
by 3.1+ code will have their segments recording their version, whether they are
pre-3.0 or not).
> 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-2720-3x.patch, 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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