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Investigate Citus for distributed tile store in Postgres
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Description - sounds really awesome and might bring Postgres in par with Cassandra in flexibility. My main fear with tiles in Postgres was that we may eventually end up in a situation where whole dataset will not fit onto a single machine. Citus sounds like it might help fix this.

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I was looking through the docs, trying to figure out how to do multi-datacenter setup. The doc claims it is datacenter aware, but not sure how to set it up. Also, since this is a master-slave setup, does it mean that all queries have to go via the master?

We're not going to introduce new technologies in our stack at this point.