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I need some advice on architecture.

I have a national database that relies on postgres and some architectural design that involves orchestrating several components, very much similar to the picture found here. We want to achieve HA and scaleability.

Now, before I move further with the proposal, I have a couple of questions :

  1. What considerations need to be taken before choosing multi-master replication vs master-slave replication?

  2. which one is easier to maintain: multi masters or master - slave ?

    2.a. If master - slave configuration is setup in such a way so that the slave can act as master in case the primary master goes down, isn't it the same as multi masters configuration?

  3. How do we know which one suits well to answer the problem?

thank you for any advice or perhaps there are some readings that I can read?

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  • That's easy: as there is no multi-master replication for Postgres, you can only use a classical master-slave replication.
    – user1822
    Nov 11, 2022 at 16:45
  • But I read here hevodata.com/learn/postgresql-multi-master-replication, it says multimasters is configuration that allows multiple nodes to have write access @a_horse_with_no_name
    – padjee
    Nov 14, 2022 at 2:13

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