Any practical limits to the number of znodes?

[Jon Stefansson]

I am considering using ZooKeeper as a Lock mechanism in an application that
eventually could produce several hundred thousand znodes per day. The znodes
will contain little or no data. There will just be a lot of them.
I don't see anything in the ZooKeeper documentation regarding znode size
constraints. Is this a good use case for ZooKeeper?