Local service + {Locality, replication lag, role, database cardinality, load balancing goals}.
本地服务优先+{本地性，复制时延，角色，数据库可选择性，负载均衡目标}。
The data replication not only reduces network lag and bandwidth consumption when accessing long-range data, but also improves load balance of network, security and reliability of data.
数据复制不仅可以降低远程访问数据的网络延迟及带宽消耗，还可以提高网络的负载平衡，并且提高数据的安全性、可靠性。
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