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https://issues.apache.org/jira/browse/LUCENE-5574?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13960297#comment-13960297
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Uwe Schindler commented on LUCENE-5574:
---------------------------------------

bq. I'll disable the test on Windows w/ FSDir like you suggested...

Thats not so easy because of crazy wrapping we do with MockDirs, NRTCaching and 
others. So I think you can only disable on WINDOWS. I tried to go the path up 
to the root directory, but that does only work if the dir extends 
FilterDirectory.

> NRT Reader close can wipe index it doesn't own
> ----------------------------------------------
>
>                 Key: LUCENE-5574
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5574
>             Project: Lucene - Core
>          Issue Type: Bug
>          Components: core/index
>    Affects Versions: 4.8, 5.0, 4.7.1
>            Reporter: Simon Willnauer
>            Priority: Critical
>             Fix For: 4.8, 5.0, 4.7.2
>
>         Attachments: LUCENE-5574.patch, LUCENE-5574.patch, LUCENE-5574.patch, 
> LUCENE-5574.patch
>
>
> Today NRT Readers try to clean up unused files via their IW reference when 
> they are closed. Yet, if the index writer is already closed another index 
> could have been created on the same directory which can create the same files 
> as the IW before. For the NRT Reader those files are not referenced and it 
> will simply wipe them away. If you use this in a replication scenario where 
> directories are reused this can simply wipe your index away or in combination 
> with the FSync issue LUCENE-5570 create 0-byte files. I have a test that 
> reproduces this issue



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