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ASF subversion and git services commented on LUCENE-9405: --------------------------------------------------------- Commit 47cffbcdd8aa4895c32b0b7a64379fd9f6dd02d5 in lucene-solr's branch refs/heads/master from Simon Willnauer [ https://gitbox.apache.org/repos/asf?p=lucene-solr.git;h=47cffbc ] LUCENE-9405: Ensure IndexWriter only closes merge readers once. (#1580) IndexWriter incorrectly calls closeMergeReaders twice when the merged segment is 100% deleted ie. would produce a fully deleted segment. > 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 > 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 ... -- This message was sent by Atlassian Jira (v8.3.4#803005) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@lucene.apache.org For additional commands, e-mail: issues-h...@lucene.apache.org