Use of arbiter in MongoDB

Source: Internet
Author: User

According to the study of the official documentation, if two copies of data are required in the RS mode, Arbiter must be used, because if there are only two copies, therefore, the MongoDB election policy cannot determine which is primary and which is secondary. Therefore, an additional arbiter is required to participate in the voting, currently, MongoDB supports a maximum of 12 replica sets, so an additional arbiter is required as the voting machine. In addition, if more than half of the current Rs machines are down, the current Rs cannot be written and can only be read!

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