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https://issues.apache.org/jira/browse/LUCENE-8043?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Simon Willnauer updated LUCENE-8043:
------------------------------------
    Attachment: LUCENE-8043.patch

folks, I have a test that reliably reproduces the issue every time and very 
quickly. It also trips an assertion in the IW that I had to change since I 
think it's not guaranteed especially with the setup I am running in the test. 
[~mikemccand] can you take a look.

> Attempting to add documents past limit can corrupt index
> --------------------------------------------------------
>
>                 Key: LUCENE-8043
>                 URL: https://issues.apache.org/jira/browse/LUCENE-8043
>             Project: Lucene - Core
>          Issue Type: Bug
>          Components: core/index
>    Affects Versions: 4.10, 7.0, master (8.0)
>            Reporter: Yonik Seeley
>            Assignee: Simon Willnauer
>         Attachments: LUCENE-8043.patch, LUCENE-8043.patch, 
> YCS_IndexTest7a.java
>
>
> The IndexWriter check for too many documents does not always work, resulting 
> in going over the limit.  Once this happens, Lucene refuses to open the index 
> and throws a CorruptIndexException: Too many documents.
> This appears to affect all versions of Lucene/Solr (the check was first 
> implemented in LUCENE-5843 in v4.9.1/4.10 and we've seen this manifest in 
> 4.10) 



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