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https://issues.apache.org/jira/browse/LUCENE-8290?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16461106#comment-16461106
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Simon Willnauer commented on LUCENE-8290:
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[~mikemccand] can you take a look
> Keep soft deletes in sync with on-disk DocValues
> ------------------------------------------------
>
> Key: LUCENE-8290
> URL: https://issues.apache.org/jira/browse/LUCENE-8290
> 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-8290.patch
>
>
> Today we pass on the doc values update to the PendingDeletes
> when it's applied. This might cause issues with a rentention policy
> merge policy that will see a deleted document but not it's value on
> disk.
> This change moves back the PendingDeletes callback to flush time
> in order to be consistent with what is actually updated on disk.
>
> This change also makes sure we write values to disk on flush that
> are in the reader pool as well as extra best effort checks to drop
> fully deleted segments on flush, commit and getReader.
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