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https://issues.apache.org/jira/browse/LUCENE-8043?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16271874#comment-16271874
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Yonik Seeley commented on LUCENE-8043:
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I had worked on tracking this down for a bit before I got pulled off onto
something else...
I remember adding the boolean to drop() just as this patch does, but when using
that I only put the conditional around the pendingNumDocs decrement (in
multiple places). Perhaps that's why it didn't work to fix the issue for me...
I also exposed pendingNumDocs for testing reasons and then tested it against
expected values, and was able to get tests that reliably failed after a handful
of updates. I'll try digging that up and see if it passes with this patch.
> 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
>
>
> 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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