This option is useful if you have replica sets.
如果你有这个选项是有用的副本集。
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。
The documentation talks a lot about metadata management and ways in which individual replica sets can implement it.
该文档大量谈及元数据管理和单独副本集对它的实现方式。
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