by young » Sun Nov 11, 2012 11:23 pm
It is possible that a node will go down during a read or write operation. The client API will try to connect to the database using the node ip but not get a response. When this happens, the client API will automatically try to contact the database using the next available node in the cluster that it knows about. From a coding standpoint, you do not need to be aware of this as the API handles additional attempts at communicating with the database.