Github user s1monw commented on the issue: https://github.com/apache/lucene-solr/pull/503 @msokolov I measures a pretty signficant lock contention on this lock without my change. with the change it went down significantly. Refreshes got 30% faster for that benchmark (small docs with 25% collision on the IDs and soft-deletes enabled). There was some minor indexing throughput improvements but nothing major.
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