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https://issues.apache.org/jira/browse/LUCENE-5377?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13878701#comment-13878701
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Shai Erera commented on LUCENE-5377:
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bq. First of all, some test should fail.
I modified TestBackCompatibility.testAddIndexes to do this:
{code}
boolean orig = OLD_FORMAT_IMPERSONATION_IS_ACTIVE;
OLD_FORMAT_IMPERSONATION_IS_ACTIVE = false;
// test code goes here
OLD_FORMAT_IMPERSONATION_IS_ACTIVE = orig;
{code}
And now it fails, because writing with old Codecs is not supported. Maybe it
cannot be done like that for 4x because we need to support 3x indexes, but I
haven't tried (because in 4x we catch and ignore the UOE, so I don't know yet
how it will affect the test).
bq. or change things so it doesnt need to write .si at all here (e.g. put
partial filenames in the .si that don't include segment prefix)
That's a good idea - if we strip the segment name from the files .si records
(which is redundant anyway!), we won't need to rewrite .si. I believe though
that we should fix this in 4.6.1?
> Lucene 4.6 cause mixed version segments info file(.si) wrong
> ------------------------------------------------------------
>
> Key: LUCENE-5377
> URL: https://issues.apache.org/jira/browse/LUCENE-5377
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/index, modules/facet
> Affects Versions: 4.6
> Environment: windows/linux
> Reporter: Littlestar
> Attachments: TestCore_45.java, TestCore_46.java
>
>
> my old facet index create by Lucene version=4.2
> use indexChecker ok.
> now I upgrade to Lucene 4.6 and put some new records to index.
> then reopen index, some files in indexdir missing....
> no .si files.
> I debug into it, new version format of segments.gen(segments_N) record bad
> segments info.
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