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

["Shawn Heisey (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SOLR-7585?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

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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