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https://issues.apache.org/jira/browse/SOLR-7585?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shawn Heisey resolved SOLR-7585.
--------------------------------
Resolution: Fixed
Fix Version/s: 5.2
Trunk
Assignee: Shawn Heisey
Committed to trunk, branch_5x, and lucene_solr_5_2. Precommit passed for each.
Also made sure that the new test failed without the fix and passed with the
fix. Thanks for figuring this out, [~maciej.zasada]!
> 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
> Assignee: Shawn Heisey
> Priority: Minor
> Fix For: Trunk, 5.2
>
> Attachments: SOLR-7585.patch, SOLR-7585.patch, SOLR-7585.patch,
> SOLR-7585.patch, SOLR-7585.patch
>
>
> 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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