This is also made possible by the use of three failure groups, which are further explained under Data replication.
这是通过使用三个故障组得以实现的，我们将在数据复制一节详细对之进行介绍。
2
Setting up of a different replication topology under a base that already has replication set up can be quite tedious.
在已经设置了复制的条目基下面设置不同的复制拓扑很麻烦。
3
A forwarding layer maps ranges of source IDs to physical databases, and replication is handled by building a tree of such tables under the same forwarding address.