[jira] Commented: (JCR-1087) Maintain the cluster revision table

["Martijn Hendriks (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/JCR-1087?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12536504 ] 

Martijn Hendriks commented on JCR-1087:
---------------------------------------

The resolution of JCR-905 allows us to remove all unnecessary revision data. I.e., the minimum of all local revisions of the clusternodes gives an upperbound on the revisions that can safely be removed from the database.

A solution for this issue would be to add a periodic task that removes all unnecessary revisions:
- All clusternodes should add their local revision to the database.
- Add a configuration option in the repository.xml to let one of the clusternodes execute the cleanup task (i.e., period and offset such as "every night at 00:00 hours").

> Maintain the cluster revision table
> -----------------------------------
>
>                 Key: JCR-1087
>                 URL: https://issues.apache.org/jira/browse/JCR-1087
>             Project: Jackrabbit
>          Issue Type: Improvement
>          Components: clustering
>    Affects Versions: 1.3
>         Environment: A clustered Jackrabbit
>            Reporter: Martijn Hendriks
>            Priority: Minor
>         Attachments: cluster-trace.txt
>
>
> The revision table in which cluster nodes write their changes can potentially become very large. If all cluster nodes are up to date to a certain revision number, then it seems unnecessary to keep the revisions with a lower number.

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