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https://issues.apache.org/jira/browse/JCR-3311?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14206237#comment-14206237
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Michael Dürig commented on JCR-3311:
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Not sure about the 2.13 part, however upgrading from Jackrabbit 2 to Oak is
supported through the upgrade run mode of {{oak-run}}. See
https://github.com/apache/jackrabbit-oak/blob/trunk/oak-run/README.md
> No mechanism to transparently engage BTreeManager for flat repositories
> -----------------------------------------------------------------------
>
> Key: JCR-3311
> URL: https://issues.apache.org/jira/browse/JCR-3311
> Project: Jackrabbit Content Repository
> Issue Type: Bug
> Components: jackrabbit-jcr-commons
> Affects Versions: 2.2, 2.3, 2.4
> Reporter: David Hausladen
> Assignee: Michael Dürig
> Priority: Minor
> Labels: flat, repository
> Attachments: NodeWrapper.java
>
>
> For someone to enjoy the benefits of the BTreeManager to map between an
> external, flat path and an internally-branching tree, he must use
> jackrabbit-specific classes to achieve it. This is is undesirable. It would
> be better if, through configuration, he could specify that his paths are
> likely flat and Jackrabbit would return implementations of the Node interface
> that would interact with the BTreeManager internally so that the application
> code could remain agnostic of the internal challenges of dealing with large
> numbers of child nodes.
> I've attached NodeWrapper.java which is a preliminary attempt at adapting the
> Node interface to the BTreeManager. In practice, however, I found that if
> the returned, wrapped Nodes were interrogated for their path, they would
> return the internal, rather than external, paths. Without an approach to
> address this problem, I abandoned testing.
> I would not have a problem with an assumption that the configuration option
> must be chosen at repository creation time and must not be changed thereafter.
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