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From Michael Dürig (JIRA) <j...@apache.org>
Subject [jira] Updated: (JCR-2710) Add support for large number of users in a group
Date Tue, 24 Aug 2010 12:08:20 GMT

     [ https://issues.apache.org/jira/browse/JCR-2710?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Michael Dürig updated JCR-2710:
-------------------------------

    Attachment: JCR-2710.png

Graph of the performance difference between the two content models for group memberships.
The graphs represent the cumulative time for adding new users to a group. The blue graph displays
the old content model where group membership is recorded in a multi valued property of weak
references. The orange graph display the new content model where group membership is recorded
in a b-tree like node structure.  

> Add support for large number of users in a group
> ------------------------------------------------
>
>                 Key: JCR-2710
>                 URL: https://issues.apache.org/jira/browse/JCR-2710
>             Project: Jackrabbit Content Repository
>          Issue Type: Improvement
>          Components: jackrabbit-core
>    Affects Versions: 2.2.0
>            Reporter: Michael Dürig
>            Assignee: Michael Dürig
>         Attachments: JCR-2710.png
>
>
> In the current implementation there are several factors which limit the number of users
in a group:
> - group membership is recorded in a multi valued property which does not scale well
> - members of groups are collected eagerly which does not scale well
> I propose to add complementary support for recording group membership in a node structure
to the current solution. That node structure would - similar to users and groups - add intermediate
nodes when a group reaches a certain threshold on the number of its users.

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