Couchbase, a startup selling a NoSQL database of the same name, has raised a $25 million series D round. Adams Street Partners led the round and was joined by existing investors Accel Partners, Mayfield Fund, North Bridge Venture Partners and Ignition Partners. Couchbase doesn’t have the huge user base of MongoDB or the edginess of HBase, but it does have some big-name users (including Orbitz) and the company claims sales jumped 400 percent in the last year.

Hadoop-based analytics startup Tresata last week open sourced a set of machine learning libraries built on Scalding and designed to run in Hadoop and make use of the Apache Mahout project. Tresata is calling the project Ganita, and has also written a couple of explanatory blog posts about it, including how to do k-means clustering. The barriers to doing good work on big data just keep getting lower.

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