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https://issues.apache.org/jira/browse/LUCENE-8233?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16435334#comment-16435334
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ASF subversion and git services commented on LUCENE-8233:
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Commit 9cb07c735b2095184041280bf03b3df9bfa010a1 in lucene-solr's branch
refs/heads/master from [~simonw]
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=9cb07c7 ]
LUCENE-8233: Harden PendingDeletes modification assertions
This change adds a missing call to PendingDeletes#onNewReader and
hardens the assertion when a PendingDelete can actually be modified ie.
receive deletes and updates. Now PendingDeltes are also initialized
when no reader is provided but the SegmentCommitInfo has evidence that there
is are no deletes.
> Add support for soft deletes to IndexWriter delete accounting
> --------------------------------------------------------------
>
> Key: LUCENE-8233
> URL: https://issues.apache.org/jira/browse/LUCENE-8233
> Project: Lucene - Core
> Issue Type: Improvement
> Affects Versions: 7.4, master (8.0)
> Reporter: Simon Willnauer
> Priority: Major
> Fix For: 7.4, master (8.0)
>
> Attachments: LUCENE-8232.patch, LUCENE-8233.patch, LUCENE-8233.patch,
> LUCENE-8233.patch
>
>
> This change adds support for soft deletes as a fully supported feature by the
> index writer. Soft deletes are accounted for inside the index writer and
> therefor also by merge policies.
>
> This change also adds a SoftDeletesRetentionMergePolicy that allows users to
> selectively carry over soft_deleted document across merges for retention
> policies. The merge policy selects documents that should be kept around in
> the merged segment based on a user provided query.
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