Thanks for the reply. I want to clarify one thing. I think about a System of 20 nodes, that uses ZooKeeper of 3 nodes. I think about master election among these 20 nodes, that do not run consensus, but they use zookeeper service for master election. I used 'leader' term for a leeder in Zookeeper (among 3 nodes), and 'master' term for master in the System (20 nodes). Solution is described here: http://zookeeper.apache.org/doc/trunk/recipes.html#sc_leaderElection (I would name it 'master' election, not 'leader' election), but I doubt if it works reliable without additional timing assumptions as I described in my previous post. Please consider my previous post in the context of the System that uses Zookeeper (not ZooKeeper itself).
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