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In case if one member of a cluster is not available it will retry with another one and fetch the new cluster configuration. Default timeout for all requests to etcd is 5 seconds. Initial cluster configuration can be resolved through: 1) /v2/members call on one of the cluster members on a client port 2) when it is possible to resolve hostname into multiple ip's it will iterate through list and try to perform action from 1) 3) If there is discovery_srv defined in etcd section of config file it will resolve peer addresses of all cluster members and will fetch cluster configuration with using peer protocol by doing /members call on a peer port