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https://issues.apache.org/jira/browse/LUCENE-5934?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14128766#comment-14128766
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Michael McCandless commented on LUCENE-5934:
--------------------------------------------
Can we move the codec check:
{noformat}
if ((si.getCodec() instanceof Lucene3xCodec) == false) {
{noformat}
up into SIS.write, just before:
{noformat}
if (!segmentWasUpgraded(directory, si)) {
{noformat}
?
This way if something like this tries to happen again in 4.x, at least we don't
corrupt-on-kiss and instead just throw the exception and rollback the 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, LUCENE-5934.patch, LUCENE-5934.patch,
> LUCENE-5934.patch, LUCENE-5934.patch
>
>
> As reported by Ian on the user list:
> Its trying to treat them as 3.x
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