Maciej Zasada created SOLR-7585:
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Summary: ConcurrentLFUCache throws NoSuchElementException under a
write-heavy load
Key: SOLR-7585
URL: https://issues.apache.org/jira/browse/SOLR-7585
Project: Solr
Issue Type: Bug
Affects Versions: 5.1
Reporter: Maciej Zasada
Priority: Minor
Under a write-heavy load {{ConcurrentLFUCache}} throws
{{NoSuchElementException}}. The problem lies within
{{org.apache.solr.util.ConcurrentLFUCache#put}} method, which allows for a race
condition between the check and the call to {{markAndSweep}} method. Despite
that a thread must acquire a lock to perform sweeping, it's still possible that
multiple threads successfully detected a need for calling markAndSweep. If they
execute it sequentially, subsequent runs will fail with
{{NoSuchElementException}}.
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