Depending on what a user needs to see, you can also have parallel structures and select a cluster based on user number.
Your insistence on guarantees is worrisome, though. As much as I like ZK, I like getting rid of hard consistency requirements even more. As I tend to put it, the cost of "NOW" increases very rapidly with diameter of the "NOW" that you are buying. If you can avoid buying anything but very small "NOW"s you will be much, much better off. On Sat, Jul 24, 2010 at 2:39 PM, Maarten Koopmans <maar...@vrijheid.net>wrote: > Also, I want to be able to add clusters as the number of nodes grows. Note > that the #nodes will grow with the #users of the system, so the clusters can > grow sequentially, hence the symlink idea.