It's really a much longer story. We use Redis and Couch together. Redis for caching, Couch for long-term storage. Whether Couch has or doesn't have Map/Reduce

It's really a much longer story. We use Redis and Couch together. Redis for caching, Couch for long-term storage. Whether Couch has or doesn't have Map/Reduce is irrelevant, really. Couch Map/Reduce is a toy (just like Riak) and is not to be trusted. We avoid it as much as possible.