Polyglot is here. It creates opportunities for a lot of folks. And it creates a lot of headaches for others. The open source NoSQL analytics project, SlamData, will reduce a lot of the friction described in these comments. I work on the project.

Three things to know:

1. SlamData is souped-up SQL + data viz platform. 2. SlamData send analytics to the data (computation happens in-database) 3. SlamData connects to MongoDB, Couchbase, MarkLogic, Spark and relational stores. 4. You can do JOINs across data stores

Four things, sorry.

If you want to know what's going on across a polyglot business or application... it's exponentially easier now. So go ahead and use the new technology -- the overhead isn't nearly as much as it was. I think this materially changes the conversation.