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https://issues.apache.org/jira/browse/LUCENE-5377?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13878764#comment-13878764
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Shai Erera commented on LUCENE-5377:
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I guess I messed this up when working on LUCENE-5196, turning impersonation to 
true by default. Sorry about that, hope it won't impact a lot of tests.

> IW.addIndexes(Dir[]) causes silent index corruption
> ---------------------------------------------------
>
>                 Key: LUCENE-5377
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5377
>             Project: Lucene - Core
>          Issue Type: Bug
>          Components: core/index
>    Affects Versions: 4.6
>         Environment: windows/linux
>            Reporter: Littlestar
>            Assignee: Robert Muir
>         Attachments: LUCENE-5377.patch, 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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