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From "Thomas Mueller (JIRA)" <j...@apache.org>
Subject [jira] Updated: (JCR-2857) Support sequential (non-random) node ids
Date Tue, 04 Jan 2011 16:18:45 GMT

     [ https://issues.apache.org/jira/browse/JCR-2857?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Thomas Mueller updated JCR-2857:
--------------------------------

    Attachment: jcr-2857.patch

This patch is a first version of the node id factory. The default behavior is to generate
random id like now. If the system property jackrabbit.sequentialNodeId is set, node ids are
generated sequentially. The next node id is stored in a file nodeId.properties. This file
is updated every 128 generated node ids for performance reason. If the process is killed,
up to 128 node ids are lost. The counter only covers the lower 64 bits, the 64 most significant
bits (msb) are fixed (to 0 unless otherwise specified). If the system property jackrabbit.sequentialNodeId
contains a '/', then the next id is read from there. Example: 1/0 means the msb is set to
1 and the lsb to 0. In this way, sequential node ids can be used in a cluster (each cluster
node needs it's own msb).

> Support sequential (non-random) node ids
> ----------------------------------------
>
>                 Key: JCR-2857
>                 URL: https://issues.apache.org/jira/browse/JCR-2857
>             Project: Jackrabbit Content Repository
>          Issue Type: Improvement
>          Components: jackrabbit-core
>            Reporter: Thomas Mueller
>            Assignee: Thomas Mueller
>         Attachments: jcr-2857.patch
>
>
> Currently, node ids are generated using a (cryptographically secure pseudo-) random number
generator. This has a many advantages (easy to implement, easy to merge nodes from multiple
repositories or cluster nodes), but is a performance bottleneck for large repositories.
> In addition to generating random node ids, Jackrabbit should support generating sequential
node ids.

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