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https://issues.apache.org/jira/browse/LUCENE-8253?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16440943#comment-16440943
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ASF subversion and git services commented on LUCENE-8253:
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Commit d904112428184ce9c1726313add5d184f4014a72 in lucene-solr's branch
refs/heads/master from [~simonw]
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=d904112 ]
LUCENE-8253: Don't create ReadersAndUpdates for foreign segments
IndexWriter#numDeletesToMerge was creating a ReadersAndUpdates
for all incoming SegmentCommitInfo even if that info wasn't private
to the IndexWriter. This is an illegal use of this API but since it's
transitively public via MergePolicy#findMerges we have to be conservative
with regestiering ReadersAndUpdates. In IndexWriter#numDeletesToMerge we
can only use existing ones. This means for soft-deletes we need to react
earlier in order to produce accurate numbers.
This change partially rolls back the changes in LUCENE-8253. Instead of
registering the readers once they are pulled via IndexWriter#numDeletesToMerge
we now check if segments are fully deleted on flush which is very unlikely and
can be done in a lazy fashion ie. it's only paying the extra cost of opening a
reader and checking all soft-deletes if soft deletes are used and present
in the flushed segment.
This has the side-effect that flushed segments that are 100% hard deleted are
also
cleaned up right after they are flushed, previously these segments were sticking
around for a while until they got picked for a merge or received another delete.
This also closes LUCENE-8256
> ForceMergeDeletes does not merge soft-deleted segments
> ------------------------------------------------------
>
> Key: LUCENE-8253
> URL: https://issues.apache.org/jira/browse/LUCENE-8253
> Project: Lucene - Core
> Issue Type: Bug
> Affects Versions: 7.4, master (8.0)
> Reporter: Nhat Nguyen
> Assignee: Simon Willnauer
> Priority: Major
> Attachments: LUCENE-8253.patch, test-merge.patch
>
>
> IndexWriter#forceMergeDeletes should merge segments having soft-deleted
> documents as hard-deleted documents if we configured "softDeletesField" in an
> IndexWriterConfig.
> Attached is a failed test.
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