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You're kind of in an active-passive multi-master setup which is find for now but as replication queries increase between the two nodes, you might start to see load issues. You're going to have to drop in a third machine and a decision is going to have to be made on how to replicate your data.

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Yes. The other big problem with this setup is that a single node must be able to handle all queries if the other node fails. Fortunately, we are nowhere near saturating the capacity of our nodes under normal operation (we are only doing about 1,200 queries/second). We are also able to offload read-only queries to slaves that are replicating off of the masters, which should help with the read capacity, which is our biggest demand.

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