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https://issues.apache.org/jira/browse/LUCENE-5934?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14128463#comment-14128463
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Robert Muir commented on LUCENE-5934:
-------------------------------------
What happened with the safety check?
The user hit it, which is nice:
{noformat}
java.lang.IllegalStateException: cannot
write 3x SegmentInfo unless codec is Lucene3x (got: Lucene40)
at org.apache.lucene.index.SegmentInfos.write3xInfo(SegmentInfos.java:607)
{noformat}
Can we move it before we do anything destructive for additional safety? or does
it not matter and due to fallback logic in commit...
> 4.10 broke backwards compatibility for 4.0 indexes
> --------------------------------------------------
>
> Key: LUCENE-5934
> URL: https://issues.apache.org/jira/browse/LUCENE-5934
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/codecs, core/index
> Affects Versions: 4.10
> Reporter: Robert Muir
> Priority: Blocker
> Fix For: 4.10.1, 4.11, 5.0
>
> Attachments: LUCENE-5934.patch
>
>
> As reported by Ian on the user list:
> Its trying to treat them as 3.x
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