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https://issues.apache.org/jira/browse/LUCENE-8293?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16463664#comment-16463664
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ASF subversion and git services commented on LUCENE-8293:
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Commit 3a6f5313d6b4a23dea2030cb5d63ad522536f501 in lucene-solr's branch
refs/heads/master from [~simonw]
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=3a6f531 ]
LUCENE-8293: Ensure only hard deletes are carried over in a merge
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.
> 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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