[jira] [Created] (SOLR-7585) ConcurrentLFUCache throws NoSuchElementException under a write-heavy load

["Maciej Zasada (JIRA)" <ji...@apache.org>]

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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