TreeCache will replicate the modified key value pairs, not the whole node and
definitely not any other nodes. So if you do a put("/a/b/c", "x", "y") an
object encapsulating that command is replicated.
Putting everything in one node could be faster in a simple test because the
shallower your tree, the faster the navigation to the needed node is. But,
there could be a heavy price to pay in a multi-threaded system. With
READ_COMMITTED or stronger isolation, if one thread is modifying that node, all
other threads are blocked waiting to read it. With finer-grained nodes, any
lock contention is also more fine grained.
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