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I don't suppose you'd consider blogging about that setup (and in particular which data store you find to be natural for which scenario)? I don't know Redis or Cassandra (or similar) very well, which means it's hard to know what sort of things they're best suited to, compared to each other or to an RDBMS.

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At some point I would like to blog about it but right now I am under the gun to deliver a product so I'm writing a lot more code than english for the next few months.

In a nutshell I use Postgres for the relatively static data and Cassandra for the very high volume transactional data. I use Redis for ad-hoc data structures and some caching. The natural fit means I'm not jamming de-normalized data into a relational database for performance reasons. Hope this helps.

Yes, that's useful - thanks!

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