Simon Willnauer created LUCENE-8293:
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Summary: Ensure only hard deletes are carried over in a merge
Key: LUCENE-8293
URL: https://issues.apache.org/jira/browse/LUCENE-8293
Project: Lucene - Core
Issue Type: Bug
Affects Versions: 7.4, master (8.0)
Reporter: Simon Willnauer
Fix For: 7.4, master (8.0)
Attachments: LUCENE-8293.patch
Today we carry over hard deletes based on the SegmentReaders liveDocs.
This is not correct if soft-deletes are used especially with rentention
policies. If a soft delete is added while a segment is merged the document
might end up hard deleted in the target segment. This isn't necessarily a
correctness issue but causes unnecessary writes of hard-deletes. The biggest
issue here is that we assert that previously deleted documents are still
deleted
in the live-docs we apply and that might be violated by the retention
policy.
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