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Posted to oak-issues@jackrabbit.apache.org by "Davide Giannella (JIRA)" <ji...@apache.org> on 2014/06/04 12:35:02 UTC

[jira] [Assigned] (OAK-1717) Concurrent updates of ordered index in cluster may fail

     [ https://issues.apache.org/jira/browse/OAK-1717?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Davide Giannella reassigned OAK-1717:
-------------------------------------

    Assignee: Davide Giannella

> Concurrent updates of ordered index in cluster may fail
> -------------------------------------------------------
>
>                 Key: OAK-1717
>                 URL: https://issues.apache.org/jira/browse/OAK-1717
>             Project: Jackrabbit Oak
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 0.20
>            Reporter: Marcel Reutegger
>            Assignee: Davide Giannella
>              Labels: concurrency
>         Attachments: OAK-1717-IT.patch
>
>
> In a clustered deployment with DocumentNodeStore on MongoDB it may happen that concurrent updates on the new ordered index fail because of conflicts.
> A common use case is maintaining an ordered index on a last modified date. When nodes with such a date are added concurrently on multiple cluster nodes, then all of them will try to update the ordered index at one end of the key list. The DocumentNodeStore will perform a couple of retries but there is no guarantee that the cluster nodes will sync within that time frame or some other session conflicts yet another time.
> A possible workaround is to declare the index as asynchronous.



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