Mike Drob created SOLR-9524:
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Summary: SolrIndexSearcher.getIndexFingerprint uses dubious
sunchronization
Key: SOLR-9524
URL: https://issues.apache.org/jira/browse/SOLR-9524
Project: Solr
Issue Type: Bug
Security Level: Public (Default Security Level. Issues are Public)
Affects Versions: 6.3
Reporter: Mike Drob
In SOLR-9310 we added more code that does some fingerprint caching in
SolrIndexSearcher. However, the synchronization looks like it could be made
more efficient and may have issues with correctness.
https://github.com/apache/lucene-solr/blob/branch_6x/solr/core/src/java/org/apache/solr/search/SolrIndexSearcher.java#L2371-L2385
Some of the issues:
* Double checked locking needs use of volatile variables to ensure proper
memory semantics.
* sync on a ConcurrentHashMap is usually a code smell
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