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MongoDB Cookbook - Second Edition by Amol Nayak, Cyrus Dasadia

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Building tagged replica sets

In Chapter 1, Installing and Starting the Server, we saw how to set up a simple replica in Starting multiple instances as part of a replica set and saw what is the purpose of a replica set. We also have a good deal of explanation on what WriteConcern is in the Appendix of the book and why it is used. What we saw about write concerns is that it offers a minimum level guarantee for a certain write operation. However, with the concept of tags and write concerns, we can define a variety of rules and conditions which must be satisfied before a write operation is deemed successful and a response is sent to the user.

Consider some common use cases such as the following:

  1. Application wants the write operation to be propagated ...

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