the primary considerations are (1) being able to satisfy reads locally, without incurring cross-datacenter latency, and (2) failure scenarios. The two most common ways to configure multiple data center number of replicas per data center in a comma separated list of datacenter_name:number_of_replicas. Note that what you specify for datacenter_name depends on the cluster-configured snitch you are using. There NetworkTopologyStrategy: [default@unknown] UPDATE KEYSPACE demo WITH strategy_options = [{datacenter1:6,datacenter2:6}]; 2. On each node in the cluster, run nodetool repair for each keyspace that was updated

服务已经启动了呢？答案是使用 nodetool 工具，如下： [iteblog@www.iteblog.com apache-cassandra-3.11.4]# bin/nodetool status Datacenter: datacenter1 ======================= Status=Up/Down |/ State=Normal/Leaving/Joining/Moving -- Address