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https://issues.apache.org/jira/browse/LUCENE-8198?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16398236#comment-16398236
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ASF subversion and git services commented on LUCENE-8198:
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Commit b627fae03215fe52dee70638299e0b7c62b79c99 in lucene-solr's branch
refs/heads/branch_7x from [~simonw]
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=b627fae ]
LUCENE-8200: Allow doc-values to be updated atomically together with a document
Today we can only update a document by deleting all previously indexed
documents for the given term. In some cases like when deletes are not
`final` in the way that documents that are marked as deleted should not
be merged away a `soft-delete` is needed which is possible when doc-values
updatea can be done atomically just like delete and add in updateDocument(s)
This change introduces such a soft update that reuses all code paths from
deletes
to update all previously updated documents for a given term instead of marking
it
as deleted. This is a spinnoff from LUCENE-8198
> Add ability to persist deletes across merges
> --------------------------------------------
>
> Key: LUCENE-8198
> URL: https://issues.apache.org/jira/browse/LUCENE-8198
> Project: Lucene - Core
> Issue Type: Improvement
> Affects Versions: 7.3, master (8.0)
> Reporter: Simon Willnauer
> Assignee: Simon Willnauer
> Priority: Major
> Attachments: LUCENE-8198.patch
>
>
> This allows conditionally persist deletes on a per document basis to prevent
> them from being merged away. This expert feature is useful to maintain
> history of documents in the index where otherwise a duplicate storage
> mechanism would be needed. For instance features like CouchDBs changes API
> can be build on top of persistent deletes. While using persistent deletes has
> a considerably small overhead at merge time or when deletes applied to fully
> deleted segments, there is no impact if persistent deletes are unused.
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