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https://issues.apache.org/jira/browse/LUCENE-9405?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17136616#comment-17136616
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Michael McCandless commented on LUCENE-9405:
--------------------------------------------
Thanks [~simonw]!
> IndexWriter incorrectly calls closeMergeReaders twice when the merged segment
> is 100% deleted
> ---------------------------------------------------------------------------------------------
>
> Key: LUCENE-9405
> URL: https://issues.apache.org/jira/browse/LUCENE-9405
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/index
> Reporter: Michael McCandless
> Assignee: Simon Willnauer
> Priority: Minor
> Fix For: master (9.0), 8.6
>
> Time Spent: 1h 10m
> Remaining Estimate: 0h
>
> This is the first spinoff from a [controversial PR to add a new index-time
> feature to Lucene to merge small segments during
> commit|https://github.com/apache/lucene-solr/pull/1552]. This can
> substantially reduce the number of small index segments to search.
> See specifically [this discussion
> there|https://github.com/apache/lucene-solr/pull/1552#discussion_r440298695].
> {{IndexWriter}} seems to be missing a {{success = true}} inside
> {{mergeMiddle}} in the case where all segments being merged have 100%
> deletions and the segments will simply be dropped.
> In this case, in master today, I think we are incorrectly calling
> {{closeMergedReaders}} twice, first with {{suppressExceptions = false}} and
> second time with {{true}}.
> There is a [dedicated test case here showing the
> issue|https://github.com/apache/lucene-solr/commit/cab5ef5e6f2bdcda59fd669a298ec1377777af9d],
> but that test case relies on changes in the controversial feature (added
> {{MergePolicy.findFullFlushMerges}}). I think it should be possible to make
> another test case show the bug without that controversial feature, and I am
> unsure why our existing randomized tests have not uncovered this yet ...
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