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https://issues.apache.org/jira/browse/OAK-169?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13409228#comment-13409228
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Thomas Mueller commented on OAK-169:
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Iterating over all child nodes is always an O(n) operation (n = number of child
nodes). Of course if you store all child nodes names in the parent node you
only have to access the parent node, but that parent node is just n time larger
then. We would be back to the behavior of Jackrabbit 2.x, where adding many
child nodes is an O(n^2) operation, for orderable child node lists. This might
or might not be acceptable - I don't think we decided this when we defined our
goals.
With the linked list approach, iterating over all child nodes will have to read
all child nodes (also an O(n) operation), on the other hand it will make it
possible to support many child nodes without limitations. It is true that this
approach is probably slower if there are few child nodes (compared to storing
the complete child node name list in the parent).
I guess to decide which approach works best in practice we first need have to
define which use cases we care about and which are the most common ones.
> Support orderable nodes
> -----------------------
>
> Key: OAK-169
> URL: https://issues.apache.org/jira/browse/OAK-169
> Project: Jackrabbit Oak
> Issue Type: New Feature
> Components: jcr
> Reporter: Jukka Zitting
>
> There are JCR clients that depend on the ability to explicitly specify the
> order of child nodes. That functionality is not included in the MicroKernel
> tree model, so we need to implement it either in oak-core or oak-jcr using
> something like an extra (hidden) {{oak:childOrder}} property that records the
> specified ordering of child nodes. A multi-valued string property is probably
> good enough for this.
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