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This would keep the current configuration: when an identifier is generated, 4 levels of PairTree nodes are created to partition the identifier space.  These nodes do not behave like normal containers, for example when you list the members of a container, it traverses the PairTree nodes and lists their children.

2. Use AppleTrees

This takes a different approach to avoiding JCR nodes with too many children.  Instead of putting it in the externally-visible path, it generates an MD5 hash of the path and creates PairTrees internally to segment this child nodes.  This has many of the same benefits of #1, but hides the intermediary nodes from the user.  However, it also has the downside of being incompatible with migrating data, so it would require starting a new repository and migrating content.