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Posted to oak-issues@jackrabbit.apache.org by "Marcel Reutegger (JIRA)" <ji...@apache.org> on 2014/02/26 16:43:22 UTC

[jira] [Assigned] (OAK-1295) Recovery for missing _lastRev updates

     [ https://issues.apache.org/jira/browse/OAK-1295?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Marcel Reutegger reassigned OAK-1295:
-------------------------------------

    Assignee: Chetan Mehrotra

> Recovery for missing _lastRev updates
> -------------------------------------
>
>                 Key: OAK-1295
>                 URL: https://issues.apache.org/jira/browse/OAK-1295
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>          Components: core, mongomk
>            Reporter: Marcel Reutegger
>            Assignee: Chetan Mehrotra
>             Fix For: 0.18
>
>
> The _lastRev fields are periodically written to MongoDB with a background thread.
> This means there may be missing _lastRev updates when an Oak instance crashes.
> There must be a recovery mechanism in place when an Oak instance starts up. 
> MongoMK needs to read the most recent _lastRev for the local cluster id and get
> documents with a _modified timestamp at _lastRev or newer. These are candidates
> for missing _lastRev updates. The _lastRev must only be updated for committed
> non-branch changes.



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