One of the mongod processes is the master in its replica set.
Mongod的进程之一在其副本集合中是主进程。
Each shard is a group of machines set up as a replica set, meaning that each machine in the shard has a full copy of the shard's data.
每个分片都是一组配置成Replica集的机器，这意味着分片里的每台机器都拥有分片数据的完整拷贝。
The new replica-set authentication feature allows automatic authentication among replica-set members using a key file and the –keyfile option.
新的Replica集身份认证功能允许Replica集的成员之间进行自动身份认证，其中使用了密钥文件和 –keyfile选项。
The new replica-set authentication feature allows automatic authentication among replica-set members using a key file and the –keyfile option.
新的Replica集身份认证功能允许Replica集的成员之间进行自动身份认证，其中使用了密钥文件和 –keyfile选项。
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