When Accumulo was developed in-house at the NSA it was called Cloudbase. When it became part of the Apache project it was renamed Accumulo. I've worked with bo

When Accumulo was developed in-house at the NSA it was called Cloudbase. When it became part of the Apache project it was renamed Accumulo. I've worked with both HBase and Cloudbase/Accumulo. HBase tooling is more mature than Accumulo's but performance characteristics are about the same. The extension model for Accumulo - for custom iterators and aggregators - is pretty easy to get the hang of right away. (In fairness I never looked into extensibility for HBase.) Both systems play well with Hadoop. Accumulo is a little bit more difficult to use with Oozie. Accumulo's built in monitoring is decent.