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https://issues.apache.org/jira/browse/LUCENE-8293?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16462609#comment-16462609
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Simon Willnauer commented on LUCENE-8293:
-----------------------------------------
[~mikemccand] I added another test and fixed some corner cases with
soft-deletes. Can you take another look?
> Ensure only hard deletes are carried over in a merge
> ----------------------------------------------------
>
> Key: LUCENE-8293
> URL: https://issues.apache.org/jira/browse/LUCENE-8293
> Project: Lucene - Core
> Issue Type: Bug
> Affects Versions: 7.4, master (8.0)
> Reporter: Simon Willnauer
> Priority: Major
> Fix For: 7.4, master (8.0)
>
> Attachments: LUCENE-8293.patch, LUCENE-8293.patch
>
>
> Today we carry over hard deletes based on the SegmentReaders liveDocs.
> This is not correct if soft-deletes are used especially with rentention
> policies. If a soft delete is added while a segment is merged the document
> might end up hard deleted in the target segment. This isn't necessarily a
> correctness issue but causes unnecessary writes of hard-deletes. The
> biggest
> issue here is that we assert that previously deleted documents are still
> deleted
> in the live-docs we apply and that might be violated by the retention
> policy.
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