David Smiley created SOLR-17375:
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Summary: Close IndexReader asynchronously on commit for performance
Key: SOLR-17375
URL: https://issues.apache.org/jira/browse/SOLR-17375
Project: Solr
Issue Type: Improvement
Security Level: Public (Default Security Level. Issues are Public)
Affects Versions: 9.3
Reporter: David Smiley
Since Lucene 9.5, and with a recent Java VM (19), Lucene uses Java's new
MemorySegments API. A negative consequence is that IndexReader.close becomes
expensive, particularly when there are many threads as it's {{{}O(threads){}}}.
Solr closes the (previous) reader on a SolrIndexSearcher open, which is
basically on commit (both soft and hard). (See Lucene
[#13325|https://github.com/apache/lucene/issues/13325])
Proposal: SolrIndexSearcher.close should perform the {{rawReader.decRef()}} in
another thread, probably a global (statically defined) thread pool of one or
two in size ([~uschindler] 's recommendation). The call to
{{core.getDeletionPolicy().releaseCommitPoint(cpg)}} which follows it should
probably go along with it.
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