[jira] [Updated] (LUCENE-8293) Ensure only hard deletes are carried over in a merge

["Simon Willnauer (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-8293?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Simon Willnauer updated LUCENE-8293:
------------------------------------
    Attachment: LUCENE-8293.patch

> 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
>
>
> 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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