Hi All, I am thinking about the choices one would have to support multiple 2-node clusters. Assume that for some reason one needs to support multiple 2-node clusters. This would mean they will have to figure out a way to run a third instance of ZK server for each cluster somewhere to ensure that a ZK cluster is available after a failure.
This works well if we have to run one or two 2-node clusters. However, what if we have to run many 2-node clusters? I have following options: 1. Find m machines to run the third instance of each cluster. Run n/m instances of ZK on each machine. 2. Modify ZooKeeper server to participate in multiple clusters. This will allow us to run y instances of third node where each instance will be part of n/y clusters. 3. Run the third instance of ZK server required for the ith cluster on one of the server on (i+1)%n cluster. Essentially, distribute the third instance across the other clusters. The pros and cons of each approach are fairly obvious. While I prefer the third approach, I would like to check what everyone thinks about the second approach. Thanks. -Vishal
