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Posted to oak-issues@jackrabbit.apache.org by "Marcel Reutegger (JIRA)" <ji...@apache.org> on 2015/07/22 13:52:04 UTC

[jira] [Updated] (OAK-2768) Fair mode for backgroundOperationLock

     [ https://issues.apache.org/jira/browse/OAK-2768?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Marcel Reutegger updated OAK-2768:
----------------------------------
    Summary: Fair mode for backgroundOperationLock  (was: Consider fair mode for backgroundOperationLock)

> Fair mode for backgroundOperationLock
> -------------------------------------
>
>                 Key: OAK-2768
>                 URL: https://issues.apache.org/jira/browse/OAK-2768
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>          Components: core, mongomk
>            Reporter: Marcel Reutegger
>            Assignee: Marcel Reutegger
>              Labels: concurrency
>             Fix For: 1.3.4
>
>         Attachments: lock time.png
>
>
> The backgroundOperationLock in DocumentNodeStore uses the default non-fair acquisition order. According to JavaDoc of ReentrantReadWriteLock it is possible that a background operation task gets delayed for a long time when the system is under load. We should probably consider using the fair mode for the backgroundOperationLock to make sure background operation tasks do not get delayed excessively.



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