This feature is particularly useful in environments such as replication and ETL where large data sets are transferred over the network.
这个功能在复制和ETL之类的环境中特别有用，在这种环境下，需要通过网络传输大型的数据集。
Better replication: real time, replica sets, more options for data durability.
更好的复制功能：实时、复制集、更多数据耐久性选项。
As an overview: the map sets described are a grouping of maps with a common set of clustering and replication criteria.
作为概览：上述map集是一组包含共同的集群和复制标准集的map。
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